Patent Publication Number: US-2023156955-A1

Title: Enclosure assembly for enhanced cooling of direct drive unit and related methods

Description:
PRIORITY CLAIM 
     This is a continuation of U.S. Non-Provisional application Ser. No. 17/444,485, filed Aug. 5, 2021, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT AND RELATED METHODS,” which is a continuation of U.S. Non-Provisional application Ser. No. 17/356,063, filed Jun. 23, 2021, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT AND RELATED METHODS,” now U.S. Pat. No. 11,129,295, issued Sep. 21, 2021, which is a divisional of U.S. Non-Provisional application Ser. No. 17/302,039, filed Apr. 22, 2021, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT AND RELATED METHODS,” now U.S. Pat. No. 11,109,508, issued Aug. 31, 2021, which claims priority to and the benefit of, under 35 U.S.C. § 119(e), U.S. Provisional Application No. 62/705,042, filed Jun. 9, 2020, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT AND RELATED METHODS,” and U.S. Provisional Application No. 62/704,981, filed Jun. 5, 2020, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT (DDU) AND RELATED METHODS,” the disclosures of which are incorporated herein by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     This disclosure relates to enclosure assemblies and related systems and methods for providing enhanced cooling of a direct drive unit (DDU), such as a direct drive turbine (DDT) connected to a gearbox for driving a driveshaft connected to a pump for use in a hydraulic fracturing systems and methods. 
     BACKGROUND 
     During fracturing operations, the equipment onboard fracturing trailers utilizes extensive cooling to facilitate operation throughout the pumping stage. The fracturing pump may have, for example, up to 5% energy loss of energy through heat rejection during operation. Such heat rejection may enter bearings, connecting rods, the casing, clamps and other highly temperature sensitive components in the pumps power end. These components are typically kept lubricated and cooled using lube oil that is pumped continuously through circuits into the pump ensuring that the lube oil is cascaded around the crank case of the fluid pump. 
     Heat rejection from the pump is still absorbed into the oil, however, and this oil is cooled through a lubrication circuit to ensure that the oil remains at a manageable temperature set out by regulation and/or pump original equipment manufacturers (OEMs). The cooling of oil may be achieved by diverting the oil to a heat exchanger (for example, a fan driven heat exchanger, tube and shell heat exchanger, or other heat exchanger as will be understood by those skilled in the art.) that is be sized and configured to be able to remove enough heat from the fluid that will allow the oil to enter the crank case again and absorb more heat rejection. 
     This cooling cycle may occur constantly onboard fracturing trailers with the operations of the heat exchangers at times being hydraulically or electrically driven. The need for higher power rated fracturing pumps, for example, 5000 HP or 7000 HP rated fracturing pumps, may require larger cooling packages to be able to manage the heat rejection. Accordingly, more heat rejection may directly correlate to the physical footprint of the cooling systems. 
     SUMMARY OF THE DISCLOSURE 
     In view of the foregoing, there is an ongoing need for an enclosure assembly and related systems and methods that are more suitable for cooling the DDU of a pumping system, as well as for high-pressure and high-power operations. 
     Accordingly, it may be seen that a need exists for managing the location of cooling systems to minimize physical footprint, for managing associated power resources efficiently, and for providing effective cooling for fracturing pumps and DDUs. The present disclosure addresses these and other related and unrelated problems in the art. 
     One exemplary embodiment of the disclosure includes an enclosure assembly to enhance cooling of a hydraulic fracturing direct drive unit (DDU) during operation. An enclosure body may be provided extending at least partially around an enclosure space to house the DDU, which may include a turbine engine that is mechanically connected to a gearbox for driving a driveshaft connected to the gearbox in order to drive a fluid pump. The enclosure assembly may include one or more heat exchanger assemblies connected to the enclosure body for cooling a process fluid associated with one or more of the DDU and the fluid pump, for example, a lubrication or other lubrication medium, and/or a hydraulic/working fluid that is heated during operation. The one or more heat exchanger assemblies may include one or more intake fan assemblies positioned in fluid communication with an external environment surrounding the enclosure body, and one or more intake fan motors may be operatively connected to the one or more intake fan assemblies. Thus, when the one or more intake fan motors is activated, the one or more intake fan assemblies may draw air into the enclosure space from the external environment at the one or more intake fan assemblies and along an airflow path through the enclosure space. One or more radiator assemblies may further be included in the one or more heat exchanger assemblies for receiving the process fluid, and positioned adjacent the one or more intake fan assemblies in the airflow path through the enclosure space to cool the process fluid with air from the external environment as it flows toward the radiator assembly. 
     In addition, the enclosure assembly may include one or more outlet fan assemblies positioned in fluid communication with the external environment. Accordingly, to maintain a desired temperature of the enclosure space, the one or more outlet fan assemblies may be operatively connected to one or more outlet fan motors to discharge air from the enclosure space to the external environment when the one or more outlet fan motors is activated such that airflow heated by the cooling of the process fluid may be ventilated from the enclosure assembly. The enclosure assembly may also include one or more temperature sensors to detect a temperature of the enclosure space and, further, one or more controllers in electrical communication with the one or more temperature sensors. The one or more controllers may be operatively connected to one or more of the one or more intake fan motors and the one or more outlet fan motors. In this regard, the one or more controllers may activate the respective one or more intake fan motors and the one or more outlet fan motors to rotate the respective one or more intake fan assemblies and the one or more outlet fan assemblies responsive to a predetermined temperature signal from the one or more temperature sensors to discharge heated air from and maintain a desired temperature of the enclosure space. 
     Another exemplary embodiment of the disclosure includes a fluid pumping system for high-pressure, high-power hydraulic fracturing operations. The system may include a direct drive unit (DDU) having a turbine engine mechanically connected to a gearbox for driving a driveshaft, and a fluid pump operatively connected to the DDU by the driveshaft for driving the fluid pump. Accordingly, one or more of the DDU and the fluid pump may generate and heat process fluid during operation, which may include lubrication oil or another lubrication medium, and/or a hydraulic or other working fluid. The system may include an enclosure assembly having an enclosure body extending around an enclosure space to house the DDU, and one or more or more heat exchanger assemblies connected to the enclosure body for cooling process fluid associated with one or more of the DDU and the fluid pump. The one or more heat exchanger assemblies of the system may include one or more intake fan assemblies positioned in fluid communication with an external environment surrounding the enclosure body, and one or more intake fan motors may be operatively connected to the one or more intake fan assemblies. When the one or more intake fan motors is activated, the one or more intake fan assemblies may draw air into the enclosure space from the external environment at the one or more intake fan assemblies and along an airflow path through the enclosure space. One or more radiator assemblies may be included in the one or more heat exchanger assemblies for receiving the process fluid, and may be positioned adjacent the one or more intake fan assemblies in the airflow path through the enclosure space to cool the process fluid with the air drawn in from the external environment as it flows through the radiator assembly. 
     The system&#39;s enclosure assembly may also include one or more outlet fan assemblies positioned in fluid communication with the external environment. In order to maintain a desired temperature of the enclosure space, the one or more outlet fan assemblies may be operatively connected to one or more outlet fan motors to discharge air from the enclosure space to the external environment when the one or more outlet fan motors is activated so that airflow in the enclosure space that has been heated from the cooling of the process fluid may be ventilated from the enclosure assembly. The enclosure assembly of the system may also include one or more temperature sensors to detect a temperature of the enclosure space and, further, one or more controllers in electrical communication with the one or more temperature sensors. The one or more controllers may be operatively connected to one or more of the one or more intake fan motors and the one or more outlet fan motors. In this regard, the one or more controllers may activate the respective one or more intake fan motors and the one or more outlet fan motors to rotate the respective one or more intake fan assemblies and the one or more outlet fan assemblies responsive to a predetermined temperature signal from the one or more temperature sensors to discharge heated air from and maintain a desired temperature of the enclosure space 
     Still another exemplary embodiment of the disclosure includes a method of enhancing cooling during operation of a hydraulic fracturing direct drive unit (DDU) having a turbine engine mechanically connected to a gearbox. The method may include operating the DDU to drive a driveshaft operatively connected to a fluid pump such that one or more of the turbine engines and the fluid pump generate and heat process fluid, for example, a lubrication or other lubrication medium, and/or a hydraulic/working fluid. The method may include detecting a temperature in an enclosure space of an enclosure assembly housing the DDU with one or more temperature sensors, and, further, controlling one or more intake fan assemblies of one or more heat exchanger assemblies in the enclosure space to draw air from an external environment into an airflow through the enclosure space based upon a temperature signal detected by the one or more temperature sensors. In this regard, the method may include cooling the process fluid by directing airflow from the one or more intake fan assemblies toward one or more radiator assemblies of the one or more heat exchangers carrying the process fluid. The method may further include controlling one or more outlet fan assemblies to discharge airflow heated by the cooling of the process fluid to the external environment to maintain a desired temperature in the enclosure space. 
     Those skilled in the art will appreciate the benefits of various additional embodiments reading the following detailed description of the embodiments with reference to the below-listed drawing figures. It is within the scope of the present disclosure that the above-discussed embodiments be provided both individually and in various combinations. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       According to common practice, the various features of the drawings discussed below are not necessarily drawn to scale. Dimensions of various features and elements in the drawings may be expanded or reduced to more clearly illustrate the embodiments of the disclosure. 
         FIG.  1 A  is a schematic diagram of a pumping unit according to an embodiment of the disclosure. 
         FIG.  1 B  is a schematic diagram of a layout of a fluid pumping system according to an embodiment of the disclosure. 
         FIG.  2    is a perspective view of an enclosure assembly according to an embodiment of the disclosure. 
         FIG.  3    is a schematic sectional view of an enclosure body according to an embodiment of the disclosure. 
         FIG.  4    is a schematic sectional view of an enclosure assembly according to an embodiment of the disclosure. 
         FIG.  5    is a schematic diagram of a heat exchanger assembly according to an embodiment of the disclosure. 
         FIG.  6    is a front view of a heat exchanger assembly according to an embodiment of the disclosure. 
         FIG.  7    is a side view of a heat exchanger assembly according to an embodiment of the disclosure. 
         FIG.  8    is a plan sectional view of an enclosure assembly according to an embodiment of the disclosure. 
         FIG.  9    is a side sectional view of an enclosure assembly according to an embodiment of the disclosure. 
         FIG.  10    is a schematic diagram of a hydraulic circuit according to an embodiment of the disclosure. 
         FIG.  11    is a schematic diagram of a control circuit according to an embodiment of the disclosure. 
     
    
    
     Corresponding parts are designated by corresponding reference numbers throughout the drawings. 
     DETAILED DESCRIPTION 
     The embodiments of the present disclosure are directed to enclosure assemblies to enhance cooling of a hydraulic fracturing direct drive unit (DDU) during operation. The embodiments of the present disclosure may be directed to such enclosure assemblies for enhanced cooling of DDUs associated with high-pressure, high-power hydraulic fracturing operations. 
       FIG.  1 A  illustrates a schematic view of a pumping unit  111  for use in a high-pressure, high power, fluid pumping system  113  ( FIG.  1 B ) for use in hydraulic fracturing operations according to an embodiment of the disclosure.  FIG.  1 B  shows a typical pad layout of the pumping units  111  (indicated as FP1, FP2, FP3, FP4, FP5, FP6, FP7, FP8) with the pumping units all operatively connected to a manifold M that is operatively connected to a wellhead W. 
     By way of an example, the system  113  is a hydraulic fracturing application that may be sized to achieve a maximum rated horsepower of 24,000 HP for the pumping system  113 , including a quantity of eight (8) 3000 horsepower (HP) pumping units  111  that may be used in one embodiment of the disclosure. It will be understood that the fluid pumping system  113  may include associated service equipment such as hoses, connections, and assemblies, among other devices and tools. As shown in  FIG.  1 A , each of the pumping units  111  are mounted on a trailer  115  for transport and positioning at the jobsite. Each pumping unit  111  includes an enclosure assembly  121  that houses a direct drive unit (DDU)  123  including a gas turbine engine  125  operatively connected to a gearbox  127  or other mechanical transmission. 
     The pumping unit  111  has a driveshaft  131  operatively connected to the gearbox  127 . The pumping unit  111  includes a high-pressure, high-power, reciprocating positive displacement pump  133  that is operatively connected to the DDU  123  via the driveshaft  131 . In one embodiment, the pumping unit  111  is mounted on the trailer  115  adjacent the DDU  123 . 
     The trailer  115  includes other associated components such as a turbine exhaust duct  135  operatively connected to the gas turbine engine  125 , air intake duct  137  operatively connected to the gas turbine, and other associated equipment hoses, connections, or other components as will be understood by those skilled in the art to facilitate operation of the fluid pumping unit  111 . 
     In the illustrated embodiment, the gas turbine engine  125  may be a Vericor Model TF50F bi-fuel turbine; however, the DDU  123  may include other gas turbines or suitable drive units, systems, and/or mechanisms suitable for use as a hydraulic fracturing pump drive without departing from the disclosure. In one embodiment, the fluid pumping system  113  may include a turbine engine that uses diesel or other fuel as a power source. The gas turbine engine  125  is cantilever mounted to the gearbox  127 , with the gearbox  127  supported by the floor of the enclosure assembly  121 . 
     It should also be noted that, while the disclosure primarily describes the systems and mechanisms for use with DDUs  123  to operate fracturing pumping units  111 , the disclosed systems and mechanisms may also be directed to other equipment within the well stimulation industry such as, for example, blenders, cementing units, power generators and related equipment, without departing from the scope of the disclosure. 
       FIGS.  2  and  4    illustrate an enclosure assembly  121  that houses the DDU  123  according to an exemplary embodiment of the disclosure. As shown, the enclosure assembly  121  includes an enclosure body  165  that may extend at least partially around an enclosure space  122  to house one or more portion of the DDU  123  therein. The enclosure space  122  may also be sized and configured to accommodate other DDU/engine equipment, for example, a driveshaft interface, fuel trains, an exhaust system flanged connection, a fire suppression system, bulkheads, exhaust ducting, engine air intake ducting, hydraulic/pneumatic bulkhead hoses, inspection doors/hatches, or other components and equipment as will be understood by those skilled in the art. 
     In one embodiment, the enclosure body  165  may be a generally box-like or cuboid arrangement of walls, including a first side wall  167 , a second side wall  169  opposite the first side wall  167 , and an opposing front wall  171  and rear wall  173  each extending from the first side wall  167  to the second side wall  169 . The enclosure body  165  may also include a roof/top wall  166  ( FIG.  4   ) and a floor/bottom wall  168 . In one embodiment, the floor  168  may be formed of a solid base steel material mounted on a skid structure. 
     Referring additionally to  FIG.  3   , one or more of the walls of the enclosure body  165  may be provided with sound-attenuating, e.g., vibration-dampening, properties to minimize the transmission of sound from one or more operations of the DDU  123 , e.g., running of the turbine engine  125  and/or the gearbox  127 , from the enclosure space  122  to an external environment surrounding the enclosure body  165 . In this regard, the walls of the enclosure body  165  may have a configuration in which multiple layers are arranged to provide sound attenuation. Other sound-attenuating features may be incorporated into the construction of the enclosure assembly  121 . For example, the gearbox  127  may be provided with shock-absorbing feet or mounts that minimize the transmission of vibrations to the enclosure body  165 . 
     In one embodiment, the walls of the enclosure body  165  may include an outer metallic layer  171 , a foam or other polymeric layer  173  and a composite layer  175 , and in inner or liner metallic layer  177 , with the foam layer  173  and the composite layer  175  positioned between the metallic layers  171 ,  177 . 
     In one embodiment, the walls  167 ,  169 ,  171 ,  173  of the enclosure body  165  may be formed from approximately 12″×12″ panels with an overall thickness of about 4.5″ to about 5.25″ that may clip, snap, or otherwise connect together in a generally modular arrangement, and the outer metallic layer  171  may be, for example, a  22   ga  perforated aluminum sheet, the foam layer  173  may be, for example, a 1″ foam layer, the composite layer  175  may be, for example, a 3″-4″ layer of mineral wool, and the inner metallic layer  177  may be, for example, perforated  22   ga  aluminum. The roof  166  of the enclosure body  165  may have a similar arrangement, with an overall thickness of, for example, about 2″ and having the foam layer  173  at a thickness of about, for example, 1.5″. The enclosure body  165  may have a different arrangement without departing from the disclosure. 
     Still referring to  FIG.  2   , a plurality of doors may be movably connected/attached to the enclosure body  165 , e.g., to provide access to the enclosure space  122  for inspections, maintenance, or other operations as will be understood by those skilled in the art. A pair of doors  179  may be hingeably connected/attached to the first side wall  167  of the enclosure body  165  to provide access to the enclosure space  122  through openings formed in the first side wall  167  upon movement of the doors  179 . 
     A door  181  may also be movably connected to the second side wall  169  of the enclosure body  165  to provide access to the enclosure space  122  along the second side wall  169 . In one embodiment, the door  181  may be slidably connected/attached to the second side wall  169  on rails, tracks, or other guides as will be understood by those skilled in the art, such that slidable movement of the door  181  exposes an opening in the second side wall  169  through which an operator may access the enclosure space  122 . In one embodiment, the door  181  may have one or more foldable or otherwise reconfigurable portions. 
     With additional reference to  FIG.  4   , a generally horizontal partition  183  may extend in general parallel relation with the roof  166  and the floor  168  of the enclosure body  165  so as to provide an upper compartment  185  and a lower compartment  187  of the enclosure space  122 . In one embodiment, the upper compartment  185  may include an air intake assembly that may include an arrangement of ducts, fans, ports, filtration assemblies, blowers, compressors, cooling coils, or other components as will be understood by those skilled in the art, to feed filtered air into the turbine engine  123  positioned in the lower compartment  187 . 
     In view of the foregoing, the enclosure assembly  121  may be provided with a generally weatherproof or weather-resistant configuration that is sufficiently robust for use in hydraulic fracturing applications, and which additionally provides sound attenuation properties for enclosed and associated equipment. For example, the enclosure assembly  121  may provide sufficient sound attenuation emanating from one or more incorporated heat exchanger assemblies, as described further herein. 
     During various operations of the pumping unit  133 , e.g., startup and shutdown procedures, idling, maintenance cycles, active driving of the pumping unit  133 , or other operations as will be understood by those skilled in the art, heat may be generated in one or more portions of the pumping unit  133 , for example, via frictional engagement of components of the pumping unit  133  such as pistons, bores, or other components as will be understood by those skilled in the art. In this regard, the pumping unit  133  may employ a fluid heat transfer medium, e.g., a natural or synthetic lubrication oil, to absorb heat from the pumping unit  133  via fluid convection to reduce heat in one or more portions of the DDU  123 . 
     Similarly, during various operations of the DDU  123 , heat may be generated by one or more portions of the turbine engine  125  and the gearbox  127 . The DDU  123  may thus also employ a fluid heat transfer medium to absorb heat from the DDU  123  via fluid convection to reduce heat in one or more portions of the DDU  123 . 
     Further, various hydraulic components of the fluid pumping system  113 , e.g., actuators, motors, pumps, blowers, coolers, filters, or other hydraulic components as will be understood by those skilled in the art, that receive pressurized hydraulic fluid or working fluid therethrough may cause such hydraulic fluid/working fluid to increase in temperature during the course of such operation. 
     The aforementioned fluid heat transfer media, hydraulic fluids/working fluids, and other thermally conductive fluids associated with the fluid pumping system  113  may be collectively referred to as process fluids associated with the respective components of the fluid pumping system  113  herein. 
     In this regard, the fluid pumping system  113  may include one or more heat exchanger assemblies for cooling/reducing heat in the aforementioned process fluids. Turning to  FIG.  5   , a heat exchanger assembly  189 A according to an exemplary embodiment of the disclosure is schematically illustrated. In the illustrated embodiment, the heat exchanger assembly  189 A may be connected to, e.g., attached, mounted, or otherwise supported by, the enclosure body  165 . While the heat exchanger assembly  189 A is illustrated as being positioned in the enclosure space  122 , it will be understood that the heat exchanger assembly  189 A may be connected to the enclosure body  165  and at least partially positioned outside thereof without departing from the disclosure. 
     Still referring to  FIG.  5   , the heat exchanger assembly  189 A may include one or more intake fan assemblies  193 , one or more intake fan motors  195  operatively connected to the intake fan assembly  193 , and one or more radiator assemblies  197  positioned adjacent the intake fan assembly  193 . The heat exchanger assembly  189 A may be positioned in alignment with a cutout or opening in the enclosure body  122 , e.g., so that the heat exchanger assembly  189 A may be in at least partial fluid communication with an external environment E surrounding the enclosure assembly  121 . In one embodiment, such cutout or opening may be at least partially covered with a mounting plate  194  which may be connected to the heat exchanger assembly  189 A. 
     A sealing member  198 , for example, a gasket or other polymeric member, may be positioned between the heat exchanger assembly  189 A and the enclosure body  165 , for example, to inhibit the migration or leakage of fluids between the heat exchanger assembly  189 A and the enclosure body  165 . 
     The one or more intake fan assemblies  193  may include one or more fans  205  ( FIG.  6   ) rotatably connected to the intake fan motor  195  such that, upon receiving a driving signal or other modality of actuation, the intake fan motor  195  rotates the one or more fans  205  to rotate and circulate air through the enclosure space  122 . Such rotatable connection between the intake fan motor  195  and the fan  205  may be a driveshaft, coupling, or other mechanical transmission. The fan  205  may have a plurality of blades/arms for forcing/urging air into an airflow. In this regard, the fan  205  may be provided with blades/arms having a length, pitch, shape, or other features as will be understood by those skilled in the art, configured to influence airflow in a preselected direction. 
     As shown, the one or more radiator assemblies  197  is positioned adjacent the intake fan assembly  193 . In one embodiment, the radiator assembly  197  may be configured as a tube-and-shell heat exchanger, in which one or more conduits (e.g., tubes, ducts, hoses, fluid lines, or other conduits as will be understood by those skilled in the art) extend along bulkhead fittings on the enclosure body  122  and through an interior of a housing shell  207  to route the process fluid over a sufficient surface area to effect cooling of the process fluid. 
     The conduits extending through the housing shell  207  may carry process fluid in the form of a fluid heat exchange medium, hydraulic fluid/working fluid, or other fluid. As described further herein, the radiator assembly  197  may be positioned in an airflow path at least partially provided by the intake fan assembly  193  to remove heat from the process fluid running through the conduits. In one embodiment, the radiator assembly  197  may be covered by/positioned adjacent one or more layers of mesh or otherwise porous material. 
     Referring to  FIGS.  6  and  7   , the enclosure assembly  121  may include the heat exchanger assembly  189 A (broadly, “low-pressure heat exchanger assembly  189 A) for cooling process fluid received from a low-pressure portion of the fluid pump  133 , and the enclosure assembly  121  may further include a high-pressure heat exchanger assembly  189 B for cooling process fluid received from a high-pressure portion of the fluid pump  133 . The heat exchanger assembly  189 B may be similarly configured to the heat exchanger assembly  189 A, though the heat exchanger assemblies  189 A,  189 B may have one or more differences without departing from the disclosure. 
     As also shown, the heat exchanger assemblies  189 A,  189 B are supported on a mounting frame  191  with a generally rigid body having outer frame members  199 ,  200  intersecting at respective joints/plates  201  that may be secured with fasteners such as bolts, screws, rivets, pins, or other fasteners as will be understood by those skilled in the art. As also shown, the mounting frame  191  is provided with one or more flanges or securing tabs  203  extending from one or more of the frame members  199 ,  200  and that are configured for engagement with the enclosure body  165 . In this regard, the securing tabs  203  may have, for example, a generally flat or planar profile and/or may be provided with an opening for receiving a fastener therethrough. In one embodiment, the securing tabs  203  may be integrally formed with one or more of the frame members  199 ,  200 . 
     The heat exchanger assemblies  189 A,  189 B may both be connected to the mounting frame  191  in a vertically stacked arrangement, as shown, though each heat exchanger assembly  189 A,  189 B may be connected to the enclosure body  165  on separate mounting frames without departing from the disclosure. In one embodiment, the mounting frame  191  may be about 0.25″ thick, and may be provided with a tolerance of about 0.1″ to about 0.2″ beyond the boundaries of the heat exchanger assemblies  189 A,  189 B. 
     In one embodiment, the mounting frame  191  may be connected to a modular panel of the side wall  167  that is sized and configured to an area larger than that of the heat exchanger assemblies  189 A,  189 B. In one embodiment, such modular panel may be provided with a tolerance of about 0.35″ to about 0.45″ beyond the heat exchanger assemblies  189 A,  189 B. 
     In one embodiment, and as shown in  FIG.  2   , the enclosure assembly  121  may include additional or alternative heat exchangers, for example, a heat exchanger  189 C for cooling process fluid associated with the turbine engine  125 , a heat exchanger  189 D for cooling process fluid associated with the gearbox  127 , and a heat exchanger  189 E for cooling process fluid associated with one or more hydraulic components of the fluid pumping system  113  (e.g., auxiliary/ancillary actuators, pumps, motors, or other hydraulic components as will be understood by those skilled in the art). It will be understood that each of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E may be sized/scaled/configured according to the process fluids upon which they are operative to cool. 
     As described herein, the heat exchanger assemblies  189 C,  189 D,  189 E may have a configuration that is substantially similar to that of the heat exchanger assemblies  189 A and  189 B, though one or more of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E may have a different configuration without departing from the disclosure. By way of example, two or more of the one or more of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E may share a common mounting frame, housing shell, intake fan assembly, or other component as will be understood by those skilled in the art. 
     As shown in  FIG.  2   , the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E are connected to the enclosure body  165  and positioned in fluid communication with the external environment E such that when the respective intake fan assemblies  193  are driven by the respective intake fan motors  195 , the intake fan assemblies  193  are operative to draw air in from the external environment E toward the respective radiator assemblies  197  to remove heat/cool the process fluids flowing therethrough, and so that they may return to respective portions of the fluid pumping system for continued lubrication/cooling of components of the fluid pumping system  113 . 
     The aforementioned action of the intake fan assemblies  193  causes air from the external environment E to absorb heat from the radiator assemblies  197  as it passes thereby/therethrough and further into the enclosure space  122 . In this regard, operation of one or more of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E may cause an ambient temperature in the enclosure space  122  of the enclosure assembly  121  to increase. 
     With additional reference to  FIGS.  8  and  9   , one or more outlet/suction fan assemblies  209  may also be connected to the enclosure body  165 . The one or more outlet fan assemblies  209  may have a similar configuration to the aforementioned intake fan assemblies  193 , in that they may include one or more outlet fans, e.g., a fan  205 , in operative communication with one or more respective motors, e.g., an outlet fan motor  196 , such that upon receiving a driving signal or actuation force, the outlet fan motor  196  may drive the fan  205  to rotate. In one embodiment, the outlet fan assembly  209  may include a pair of fans  205  driven by one or more outlet fan motors  196 . It will be understood that the one or more inlet fan assemblies  193  and the one or more outlet fan assemblies  209  may be driven by the same motor or combination of motors. Although the one or more outlet fan assemblies  209  has been described herein separately from the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E, it will be understood that one or more of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E may include the one or more outlet fan assemblies  209  without departing from the disclosure. 
     In one embodiment, one or more of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E may be attached to the first side wall  167  of the enclosure body  165 , and the outlet fan assembly  209  may be attached to the second side wall  169  of the enclosure body  165 . It will be understood that the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E and the outlet fan assembly  209  may be attached to the enclosure body  165  in a different arrangement without departing from the disclosure. 
     In this regard, upon receipt of an actuation force or driving signal, the one or more outlet fan motors  196  associated with the outlet fan assembly  209  may rotate the fan  205  to discharge air from the enclosure space  122  to the external environment E. Accordingly, the arrangement of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E and the outlet fan assembly  209  is operative to draw atmospheric/cool air in from the external environment E at the intake fan assembly  193 , direct airflow toward the radiator assembly  197  to cool the process fluids flowing therethrough, and, further, to ventilate the enclosure assembly  121  by directing an airflow path A from the intake fan assembly  193  to the outlet fan assembly  209  and discharging the air from the enclosure space  122 /airflow path A that has been heated from cooling the radiator assembly  197  to the external environment E at the outlet fan assembly  209 . 
     Still referring to  FIGS.  8  and  9   , in one embodiment, one or more of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E, in cooperation with the one or more outlet fan assemblies  209 , is configured to replace a volume of air in the enclosure space  122  at an interval of about 30 seconds. It will be understood that the heat exchanger assemblies may be configured to replace the same or a different volume of air at a different time interval without departing from the disclosure. 
     Accordingly, the enclosure assembly  121  may be provided with enhanced cooling capabilities for managing excess heat generated by one or more of the DDU  123 , the fluid pump  113 , and various hydraulic components associated with the fluid pumping system  113 . As described above, one or more of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E is operative to cool process fluid associated with one or more of the DDU  123 , the fluid pump  113 , and various hydraulic components associated with the fluid pumping system  113 . Further, the intake fan assemblies  193  of the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E direct the airflow path A through the enclosure space  122  such that, in cooperation with the outlet fan assembly  209 , the air in the enclosure space  122  may be discharged to the external environment E to provide ventilation in the enclosure space  122 . Such ventilation may, for example, maintain a desired temperature of the enclosure space  122 , e.g., to further enhance a temperature differential between the airflow path A and the process fluid in the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E. 
     As described herein, one or more of the motors  195 ,  196  may be hydraulic motors, e.g., such that a pressurized working fluid/hydraulic fluid flows therethrough to actuate the motors  195 ,  196 . 
     With additional reference to  FIG.  10   , a schematic diagram is provided to show a hydraulic circuit that may be used to drive one or more of the fans  205  of the respective intake fan assemblies  193 . As shown, each intake fan motor  195  includes an inlet port  211  in fluid communication with a hydraulic pump  213  to receive pressurized fluid from the hydraulic pump  213  to actuate the respective intake fan motor  195 . The intake fan motors  195  are also in fluid communication with a return port or outlet port  215  in fluid communication with the hydraulic pump  213  to return hydraulic fluid/working fluid to the respective hydraulic pump  213  after it has passed through/actuated the respective intake fan motor  195 . Each intake fan motor  195  may also include a drain port  217  in fluid communication therewith, for example, to provide drainage of overflow/excess hydraulic fluid/working fluid, to provide a leakage path or pressure release, or other fluid release as will be understood by those skilled in the art. It will be understood that the one or more outlet fan motors  196  may be arranged/controlled in a manner similar to that described above with regard to the inlet fan motors  195 . 
     It will be understood that the hydraulic pump  213  may be in fluid communication with the respective fluid pump  133 , the turbine engine  125 , the gearbox  127 , and one or more hydraulic components of the fluid pumping system  113  to receive and return process fluid thereto, for example, through an arrangement of fluid lines, manifolds, valves, or other fluid conduit as will be understood by those skilled in the art. In one embodiment, each of the fluid pump  133 , the turbine engine  125 , the gearbox  127 , and one or more hydraulic components of the fluid pumping system  113  may be associated with a separate hydraulic pump  213 , or a combination of hydraulic pumps  213 . In one embodiment, the motors  195  associated with the respective low-pressure portion of the fluid pump  133  and the high-pressure portion of the fluid pump  133  may share one or more common fluid lines. 
     Each intake fan motor  195  may have an associated solenoid  219  that includes one or more fluid valves to control the flow of hydraulic fluid/working fluid thereto and therefrom. For example, upon receipt of a predetermined electrical signal, each solenoid  219  may actuate, e.g., open or dilate, to permit the flow of hydraulic fluid/working fluid from the hydraulic pump  213  to the respective inlet port  211  and to permit the flow of hydraulic fluid/working fluid from the respective outlet portion  215  to the hydraulic pump  213 . Similarly, the solenoid  219  may close, e.g., restrict or block, the flow of hydraulic fluid/working fluid therethrough upon receipt of a predetermined electrical signal, e.g., a closure signal. 
     While the intake fan motors  195  described herein have been described as hydraulic motors driven by pressurized hydraulic/working fluid, it will be understood that one or more of the motors  195  (or the motors  196 ) may be an electric motor driven by a received electrical actuation/driving signal. In one embodiment, one or more of the motors  195 ,  196  may be an electric motor powered from 3-phase electrical power provided by an onboard generator system capable of a voltage output of 480 V. 
     Turning to  FIG.  11   , a schematic diagram of a control system that may be used to control the inlet fan motors  195  is illustrated. As shown, each solenoid  219  may be electrically connected to a controller  221 , e.g., a programmable logic controller (PLC), an off-highway multi-controller, a processor-implemented controller, or other control feature as will be understood by those skilled in the art. In this regard, the controller  221  may be operable to actuate the solenoids  219 , e.g., to selectively open and close the valves of the solenoid  219  to permit/restrict the flow of hydraulic fluid/working fluid through the respective inlet fan motors  195 . It will be understood that the one or more outlet fan motors  196  may be controlled in a manner similar to that described above with regard to the inlet fan motors  195 . 
     In this regard, the controller  221  may be configured to transmit a driving or actuation signal to the respective solenoids  219  upon receipt of a predetermined electrical signal from a thermal/temperature sensor  223  that may be in proximity to the process fluid associated with the respective turbine engine  125 , gearbox  127 , low-pressure portion of the pump  133 , the high-pressure portion of the pump  133 , and one or more hydraulic components of the fluid pumping system  113 . In this regard, one or more temperature sensors  223  may be connected to the enclosure assembly  121  or components thereof. In one embodiment, the sensors  223  may be disposed along a fluid line between the outlet port/return portion  215  of the respective motor  195  and the hydraulic pump  213  and/or a respective reservoir for the process fluid carried therethrough. 
     In one embodiment, the sensors  223  may be digital thermometers or another electronic sensor that may receive/absorb heat from the associated respective turbine engine  125 , gearbox  127 , low-pressure portion of the pump  133 , the high-pressure portion of the pump  133 , and one or more hydraulic components of the fluid pumping system  113 , and transmit a corresponding electrical signal to the controller  221 . If the respective electrical signal corresponds to a temperature that is at or above a predetermined value or threshold, for example, set by regulation or OEMs, the controller  221  may signal the respective solenoid  219  to open the respective valves. 
     It will be understood that such actuation of the solenoids  219  may be performed at a constant or predetermined time interval, on-demand, e.g., if and when a predetermined signal is received from the sensors  223 , and/or may be performed proportionally to the temperature of the enclosure space  122 , e.g., so that determining and monitoring greater/lesser temperatures in the enclosure space  122 , the controller  221  will proportionally increase/decrease the flow rate of hydraulic/working fluid flowing through the respective intake fan motors  195 , and consequently, the speed of the respective associated fans  205 . 
     In one embodiment, one or more of the sensors  223  may include an analog device configured to receive/absorb heat and product a corresponding analog electrical signal without any intermediate processing steps, for example, as in a thermocouple, resistance temperature detector (RTD), or temperature switch. Such analog electrical signal may be a raw value determined by the controller  221  or other processor to correspond to a temperature of the enclosure space  122 . 
     While the hydraulic circuit and control of the respective fans  205  has been described above with regard to the heat exchanger assemblies  189 A,  189 B,  189 C,  189 D,  189 E, it will be understood that the fans  205  of the outlet fan assembly  209  may be driven and controlled in the same or a similar manner. 
     Still other embodiments of the disclosure, as shown in  FIGS.  1 - 11   , also include methods of enhancing cooling during operation of a hydraulic fracturing direct drive unit (DDU) having a turbine engine mechanically connected to a gearbox. An embodiment of a method may include operating the DDU to drive a driveshaft operatively connected to a fluid pump such that one or more of the turbine engine and the fluid pump generates and heats process fluid, for example, a lubrication or other lubrication medium, and/or a hydraulic/working fluid. The method may include detecting a temperature in an enclosure space of an enclosure assembly housing the DDU with one or more temperature sensors, and, further, controlling one or more intake fan assemblies of one or more heat exchanger assemblies in the enclosure space to draw air from an external environment into an airflow through the enclosure space based upon a temperature signal detected by the one or more temperature sensors. In this regard, the method may include cooling the process fluid by directing airflow from the one or more intake fan assemblies toward one or more radiator assemblies of the one or more heat exchangers carrying the process fluid. The method may further include controlling one or more outlet fan assemblies to discharge airflow heated by the cooling of the process fluid to the external environment to maintain a desired temperature in the enclosure space. 
     In view of the foregoing, the disclosed embodiments of enclosure assemblies for DDUs may provide for enhanced cooling by the configuration and arrangement of one or more heat exchangers that cool one or more process fluids associated with the DDU and/or an associated fluid pumping system while also providing ventilation and cooling of an enclosure space within the enclosure assembly. In addition to the enhanced cooling of the DDU provided by such an arrangement, the footprint of the enclosure assembly may be minimized and the management of associated power systems may be streamlined. 
     This is a continuation of U.S. Non-Provisional application Ser. No. 17/444,485, filed Aug. 5, 2021, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT AND RELATED METHODS,” which is a continuation of U.S. Non-Provisional application Ser. No. 17/356,063, filed Jun. 23, 2021, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT AND RELATED METHODS,” now U.S. Pat. No. 11,129,295, issued Sep. 21, 2021, which is a divisional of U.S. Non-Provisional application Ser. No. 17/302,039, filed Apr. 22, 2021, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT AND RELATED METHODS,” now U.S. Pat. No. 11,109,508, issued Aug. 31, 2021, which claims priority to and the benefit of, under 35 U.S.C. § 119(e), U.S. Provisional Application No. 62/705,042, filed Jun. 9, 2020, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT AND RELATED METHODS,” and U.S. Provisional Application No. 62/704,981, filed Jun. 5, 2020, titled “ENCLOSURE ASSEMBLY FOR ENHANCED COOLING OF DIRECT DRIVE UNIT (DDU) AND RELATED METHODS,” the disclosures of which are incorporated herein by reference in their entireties. 
     The foregoing description of the disclosure illustrates and describes various exemplary embodiments. Various additions, modifications, and changes may be made to the exemplary embodiments without departing from the spirit and scope of the disclosure. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense. Additionally, the disclosure shows and describes only selected embodiments of the disclosure, but the disclosure is capable of use in various other combinations, modifications, and environments and is capable of changes or modifications within the scope of the inventive concept as expressed herein, commensurate with the above teachings, and/or within the skill or knowledge of the relevant art. Furthermore, certain features and characteristics of each embodiment may be selectively interchanged and applied to other illustrated and non-illustrated embodiments of the disclosure.