Patent Publication Number: US-2016237902-A1

Title: Gas turbine inlet air conditioning coil system

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority from and the benefit of PCT Application No. PCT/CN2013/086545, filed on Nov. 5, 2013, entitled “Gas Turbine Inlet Air Conditioning Coil System,” which is herein incorporated by reference in its entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     The subject matter disclosed herein relates to gas turbine systems, and, more particularly, to an air conditioning coil system for a gas turbine compressor. 
     Gas turbine systems generally include a compressor, a combustor, and a turbine. The compressor compresses air from an air intake, and subsequently directs the compressed air to the combustor. In the combustor, the compressed air received from the compressor is mixed with a fuel and is combusted to create combustion gases. The combustion gases are directed into the turbine. In the turbine, the combustion gases pass across turbine blades of the turbine, thereby driving the turbine blades, and a shaft to which the turbine blades are attached, into rotation. The rotation of the shaft may further drive a load, such as an electrical generator, that is coupled to the shaft. The temperature of the air supplied to the air intake may affect the performance of the gas turbine system. For example, high temperatures lower the air density, thereby decreasing the mass flow rate of air entering the compressor, which reduces the efficiency and output of the gas turbine system. 
     BRIEF DESCRIPTION OF THE INVENTION 
     Certain embodiments commensurate in scope with the originally claimed invention are summarized below. These embodiments are not intended to limit the scope of the claimed invention, but rather these embodiments are intended only to provide a brief summary of possible forms of the invention. Indeed, the invention may encompass a variety of forms that may be similar to or different from the embodiments set forth below. 
     In a first embodiment, a system includes a gas turbine system, including an air intake system that includes a housing, a first plurality of air conditioning coils, a second plurality of air conditioning coils that is downstream relative to the first plurality, and a baffle extending between each of the first and second pluralities of air conditioning coils, wherein the baffle is configured to direct an air flow through the first or second pluralities of air conditioning coils in a closed position, and the baffle is configured to enable air flow to bypass the first and second pluralities of coils in an opened position. 
     In a second embodiment, a system includes an air intake system, including a first plurality of air conditioning coils at a first axial position, a second plurality of air conditioning coils positioned at a second axial position, downstream from the first, and a baffle extending between the first plurality of air conditioning coils and the second plurality of air conditioning coils, wherein the baffle is configured to enable the air flow to bypass the first and second pluralities of air conditioning coils in an opened position. 
     In a third embodiment, a gas turbine system includes a compressor, an air intake system including a first plurality of air conditioning coils at a first axial position, a second plurality of air conditioning coils positioned at a second axial position, downstream from the first, and a baffle extending between the first plurality of air conditioning coils and the second plurality of air conditioning coils, wherein the baffle is configured to enable the air flow to bypass the first and second pluralities of air conditioning coils in an opened position. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein: 
         FIG. 1  is a schematic block diagram of an embodiment of a gas turbine system; 
         FIG. 2  is a schematic of an embodiment of an air conditioning coil system, which may be included in the gas turbine system of  FIG. 1 ; 
         FIG. 3  is a schematic cross-sectional diagram of an embodiment of an air conditioning coil system with closed baffles; 
         FIG. 4  is a schematic cross-sectional diagram of an embodiment of an air conditioning coil system with open baffles; 
         FIG. 5  is a perspective view of an embodiment of an air conditioning coil system with closed baffles; 
         FIG. 6  is a perspective view of an embodiment of an air conditioning coil system with open baffles; 
         FIG. 7  is a perspective view of an embodiment of an air conditioning coil system arrangement; 
         FIG. 8  is a perspective view of an embodiment of an air conditioning coil system arrangement; and 
         FIG. 9  is a perspective view of an embodiment of an air conditioning coil system arrangement. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     One or more specific embodiments of the present invention will be described below. In an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers&#39; specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure. 
     When introducing elements of various embodiments of the present invention, the articles “a,” “an,” “the,” and “said” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. 
     The disclosed embodiments include a system and method for allowing inlet oxidant to pass through and/or bypass air conditioning coils in a gas turbine system. The air conditioning coils may include cooling coils, heating coils, or any other conditioner coils. In the discussion below, the air conditioning coils are described as cooling coils as one non-limiting example, but it is recognized that any air conditioning coils may be used. Furthermore, when reference is made to cooling air, it is understood that cooling is used as one non-limiting example of a type of air conditioning. Likewise, the oxidant may include air, oxygen, oxygen-enriched air, oxygen-reduced air, or any combination thereof. In the following discussion, the oxidant is described as air as one non-limiting example, but is intended to cover all oxidants. As described below, the disclosed embodiments may include movable sets of baffles, which may be opened or closed to allow inlet air to bypass or pass through cooling coils of an air inlet system. In this manner, cooling coils may not need to be moved into or out of the air intake system when changing from a cooling mode to a non-cooling mode, and vice versa. As discussed in detail below, in certain embodiments, the system may have at least two sets of cooling coils with a plurality of baffles extending between them. The baffles may be opened to enable air to bypass the cooling coils (e.g., in a non-cooling mode), and the baffles may be closed to direct air through the cooling coils (e.g., in a cooling mode). When in a non-cooling mode, such as during a cooler season (e.g., winter), it may be desirable to reduce the resistance caused by cooling coils to the airflow entering the compressor, which may directly affect turbine efficiency. In certain embodiments, the pressure drop across a gas turbine inlet system may be between approximately 1 and 10 inches of water column (about 2.54 to about 25.4 centimeters of water). This may include the pressure drop across an inlet cooling system, which varies from approximately 0.25 inches to approximately 2.0 inches of water column (about 0.64 to about 5.08 centimeters of water). Depending on the size of the cooling coil, the value of this pressure drop may affect the gas turbine performance and efficiency. Thus, bypassing the cooling coils via movable baffles may enable a lower pressure drop than the level with no air bypassing, thereby improving the efficiency of the gas turbine system and reducing operation costs. 
     The cooling coil system may include a first plurality and a second plurality of cooling coils. For example, the second plurality may be located downstream relative to the first plurality, with one or more baffles extending between each of the first and second pluralities of cooling coils. When the baffles are closed, the baffles may direct an air flow through the first plurality or second plurality of cooling coils, thereby enabling cooling of the air flow. Alternatively, the baffles may be open, enabling air to either go through the coils or bypass them. This bypassing air leads to a lower pressure drop than the level with no air bypassing the cooling coils. 
     Turning now to the drawings,  FIG. 1  illustrates a block diagram of an embodiment of a gas turbine system  10 . The diagram includes a compressor  12 , turbine combustors  14 , and a turbine  16 . The turbine combustors  14  include fuel nozzles  18  which route a liquid fuel and/or gas fuel, such as natural gas or syngas, into the turbine combustors  14 . As shown, each turbine combustor  14  may have multiple fuel nozzles  18 . More specifically, the turbine combustors  14  may each include a primary fuel injection system having primary fuel nozzles  20  and a secondary fuel injection system having secondary fuel nozzles  22 . 
     The turbine combustors  14  ignite and combust an air-fuel mixture to create hot pressurized combustion gasses  24  (e.g., exhaust), which are subsequently directed into the turbine  16 . Turbine blades are coupled to a shaft  26 , which is also coupled to several other components throughout the turbine system  10 . As the combustion gases  24  pass through the turbine blades in the turbine  16 , the turbine  16  is driven into rotation, which causes the shaft  26  to rotate. Eventually, the combustion gases  24  exit the turbine system  10  via an exhaust outlet  28 . Further, the shaft  26  may be coupled to a load  30 , which is powered via rotation of the shaft  26 . For example, the load  30  may be any suitable device that may generate power via the rotational output of the turbine system  10 , such as a power generation plant or an external mechanical load. For instance, the load  30  may include an electrical generator, a propeller of an airplane, and so forth. 
     In an embodiment of the gas turbine system  10 , compressor blades are included as components of the compressor  12 . The blades within the compressor  12  are coupled to the shaft  26 , and will rotate as the shaft  26  is driven to rotate by the turbine  16 , as described above. The rotation of the blades within the compressor  12  causes compression of air from an air intake  32 , thereby creating pressurized air  33 . In certain hot environments, the air intake  32  may include a system to chill inlet air (described in more detail in  FIG. 2 ) in order to increase its density, thereby increasing the mass flow rate of the pressurized air  33 . The pressurized air  33  is then fed into the fuel nozzles  18  of the combustors  14 . The fuel nozzles  18  mix the pressurized air  33  and fuel to produce a suitable mixture ratio for combustion (e.g., a combustion that causes the fuel to more completely burn) so as not to waste fuel or cause excess emissions. 
       FIG. 2  is a schematic showing an embodiment of the air intake system  32  and the compressor  12  in more detail. As shown, an air intake system housing  31  encloses the air intake system  32 , which includes a drift eliminator  34 , a chiller coil system  50 , an air filter  36 , and a controller  40  with sensors  42 . An air flow  38  flows into the air intake system  32  at air inlet  37 , and through air filter  36 . While in this embodiment the air filter  36  is disposed upstream of the chiller coil system  50 , it is understood that in certain applications, it may be desirable to place the air filter  36  downstream of the chiller coil system. The air filter  36  may be configured to limit the intake of dust, debris, and other particulate into the gas turbine engine  10  as a whole. From the air filter  36 , the air flow  38  then flows downstream to the chiller coil system  50 . The chiller coil system  50  chills the air, which increases its density and therefore its mass flow rate. Since the system  10  may be limited by its volumetric flow rate capacity, increasing the mass flow rate of the air  38  may increase the efficiency and power output of the gas turbine system  10 . Once chilled, the air flow  38  may through the drift eliminator  34 . The drift eliminator  34  may be configured to reduce the amount of water that is condensed out of the air flow  38  and carried over from the chiller coil system  50 . The drift eliminator  34  may maintain drift rates within a desired range, for example between approximately 0.001% and 0.005% of the circulating flow rate. To this end, the drift eliminator  34  may function by providing multiple directional changes of the air flow  38  while blocking the escape of water droplets. In certain embodiments, such as when a non-condensing chiller coil system is employed or when the chiller coil system  50  is replaced by a heating coil system, the drift eliminator may be optional and/or may be removed. After passing through the drift eliminator  34 , the air flow  38  exits the air intake system  32  at a point  44  that is generally opposite air inlet  37 . The air flow  38  then passes to the compressor  12 , and continues to the combustor  14 . 
     As will be appreciated, a controller  40  may regulate the air intake system  32  and, more specifically, the chiller coil system  50 , based on feedback from various sensors  42  of the air intake system  32 . The controller may include an activator or drive to move the baffles  56  (e.g., an electric motor or drive, a pneumatic actuator, a hydraulic actuator, etc.). For example, the air intake system  32  may include sensors  42  that measure temperature, pressure, flow rate, or other operating parameter of the air flow  38 . These sensors  42  may be located upstream and/or downstream of the chiller coil system  50  in the air intake system  32 , such that measurements from two or more locations may be compared and the operation of the chiller coil system  50  may be adjusted as appropriate. For example, a sensor  42  upstream of the chiller coil system  50  (e.g., sensor  48 ) may measure a first temperature and compare it with a second temperature measured downstream of the chiller coil system  50  (e.g., by a sensor  48 ). Using these temperatures, the controller  40  may monitor and control the cooling effect of the chiller coil system  50  by controlling the coolant flow and temperature. If the upstream environment temperature is or is not within a certain range, the controller  40  may send a signal  43  to switch the chiller coil system  50  from a cooling mode to a non-cooling mode, or vice versa. 
       FIG. 3  is a schematic of an embodiment of the chiller coil system  50 . The illustrated embodiment comprises two pluralities of cooler coils  53 . Specifically, a downstream plurality of cooling coils (e.g., chiller coils, evaporator coils)  52  and an upstream plurality of cooling coils  54  are located within a chiller coil system housing  55 . The downstream plurality of cooling coils  52  may be staggered relative to the upstream plurality of cooling coils  54  in the direction of the air flow  58 . The cooling coils  53  (e.g., coils  52  and  54 ) may also be referred to as chiller coils, evaporator coils, or air conditioning coils. In this embodiment, the downstream plurality of cooling coils  52  includes three cooling coils  53 , and the upstream plurality of cooling coils  54  includes two cooling coils  53 , but they each may include any suitable number of coils  53 . Baffles  56  extend between each of the first and second pluralities of cooling coils  52  and  54 . The baffles  56  may be closed, as shown in  FIG. 3 , to direct all inlet air flow  58  through the cooling coils  53 , or may open to enable the air flow  58  to bypass the coils  53 , as shown in  FIG. 4  and discussed below. 
     In the illustrated embodiment, the controller  40  is configured to regulate the operation of the baffles  56  based on measurements from various sensors  42  (shown in  FIG. 2 ), which may include a temperature sensor  62  and a pressure sensor  64  on an upstream side  70  of the cooling coils  53 , and a temperature sensor  66  and a pressure sensor  68  on a downstream side  72  of the cooling coils  53 . The controller  40  may also include flow rate sensors, relative humidity sensors, etc., which may be used to regulate operation of the baffles  56 . These various sensors  42  may send or receive signals  43  to and from the controller  40 . In certain embodiments, based at least in part on information from these sensors  42 , the controller  40  may be configured to rotate, turn, pivot, flex, fold or otherwise move the baffles  56  from an open position to a closed position, or vise versa, in order to improve compressor  12  efficiency. For example, the controller  40  may calculate a temperature drop from the upstream side  70  to the downstream side  72 . If the temperature drop is under a certain established (e.g., threshold) value, the controller  40  may change the chiller coil system  50  to a non-cooling mode. That is, the controller  40  may open the baffles  56  in order to reduce the pressure drop across the cooling coils  53 . Alternatively, the controller  40  may display or otherwise relay information to an operator, who may manage or adjust the baffles  56  manually. The baffles  56  may be positioned to be completely open, completely closed, or any suitable position in between. This flexibility increases operational flexibility and may lead to better response to environmental conditions and the needs of the gas turbine system  10 . Additionally, the movable baffles  56  allow the chiller coil system  50  to easily switch from a cooling to a non-cooling mode, and vice versa, without sacrificing efficiency caused by a large pressure drop or requiring equipment changes that may be time consuming or labor-intensive. 
     Alternatively, the baffles  56  within the embodiment of the chiller coil system  50  shown in  FIG. 3  may be open, as shown in the schematic of  FIG. 4 . When open, the baffles  56  enable the air flow  58  to pass through either the upstream plurality of cooling coils  54 , the downstream plurality of cooling coils  52 , or pass through flow paths  60  previously blocked by the baffles  56 . These additional flow paths  60  may reduce the pressure drop caused by the cooling coils  53 , as they allow more air to flow from the upstream side  70  to the downstream side  72  of the chiller coil system  50  while the cooling coils  52  and  54  remain in place. The use of the air bypass baffles  56  minimizes the air inlet system resistance by providing additional flow paths  60 , which pass between the upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52 . Additionally, the air flow  58  may continue to penetrate the cooling coils  53  even when the cooling coil system  50  is in non-cooling mode. As will be appreciated, the additional flow area provided by flow paths  60  may decrease the pressure drop from the upstream side  70  to the downstream side  72 , thereby increasing the efficiency of the compressor  12  when the chiller coil system  50  is in non-cooling mode. In certain embodiments, the baffles  56  may be attached to the cooling coils, the chiller coil housing  55 , or some other apparatus within the chiller coil system  50  via one or multiple hinges, a flexible or foldable material, or any other attachment mechanism that allows the baffle or baffles  56  to rotate, turn, pivot, flex, fold, or otherwise move between a position that blocks bypass flow paths  60  and a position that opens bypass flow paths  60 . 
     As in  FIG. 3 , the chiller coil system  50  of  FIG. 4  may include the controller  40  with upstream temperature sensor  62 , upstream pressure sensor  64 , downstream temperature sensor  66 , and downstream pressure sensor  68 . As described in detail above, the controller  40  may calculate a temperature or pressure drop across the cooling coils  53  (e.g., from the upstream side  70  to the downstream side  72 ). Based on signals  43  from the various sensors, the controller  40  may be configured to alter the position of the baffles  56  automatically, or may relay this information to an operator, who may manage the baffles  56  manually or using the controller  40 . 
       FIG. 5  is a perspective view of a partial embodiment of the chiller coil system  50 . In the illustrated embodiment, the upstream plurality of cooling coils  54  includes one cooling coil  53 , and the downstream plurality of cooling coils  52  contains two cooling coils  53 . As in previously discussed embodiments, inlet air flow  58  passes from the upstream side  70  to the downstream side  72 . The baffles  56  between the upstream cooling coil  54  and the downstream cooling coils  52  are shown in a position that directs the air flow  58  to pass through the cooling coils  53  to get from the upstream side  70  to the downstream side  72 . That is, when the baffles  56  are in the closed position, inlet air flow  58  is guided to penetrate the cooling coils  53  in order to pass from the upstream side  70  to the downstream side  72 , thereby achieving convective heat transfer between the air flow and the coolant in the cooling coils  53 . 
     As in  FIG. 3  and  FIG. 4 , the movement of the baffles  56  may be regulated manually or by a controller  40 . The controller  40  may be configured to regulate the operation of the baffles  56  based on signals  43  from the controller  40  based on measurements from various sensors  42  (shown in  FIG. 3 ), which may include sensors to measure temperature, pressure, flow rate, relative humidity, etc., upstream  70  and downstream  72  of the cooling coils  53 . Based at least in part on information from these sensors  42 , the controller  40  may be configured to open or close the baffles  56  between the upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52  to improve the efficiency of the gas turbine system  10 . For example, the controller  40  may calculate a temperature drop from the upstream side  70  to the downstream side  72  of the chiller coil system  50  to validate or monitor the performance of the chiller coil  53 . If the temperature drop is within a certain range (e.g., a threshold), the controller  40  may either change the position of the baffles  56 , or it may display or otherwise relay this information to an operator, who may manage the baffles manually or using the controller  40 . 
     To facilitate the opening or closing of the baffles  56 , each may be fitted with hinges along an edge, which may allow the baffle  56  to block bypass flow paths  60  in a cooling mode, and move to a position that opens the flow paths  60  in a non-cooling mode. For example a first baffle  76  may be attached to the chiller coil  53 , the chiller coil housing  55 , or some other apparatus within the chiller coil system  50  with a hinge  79 , hinges or some other flexible or movable attachment method along an edge  78 , allowing the baffle  76  to move between open and closed positions. Dashed line  74  illustrates how the first baffle  76  may be rotated along edge  78  to move the baffle  76  to an open position, which would enable the air flow  58  to pass through the bypass flow paths  60  to flow from the upstream side  70  to the downstream side  72 . Opening the first baffle  76  when the system  50  is in a non-cooling mode may reduce the pressure drop across the cooling coils  53 . As described above, this may increase efficiency, thereby improving operability of the gas turbine system  10 . 
       FIG. 6  is a perspective view of a partial embodiment of the downstream and upstream pluralities of cooling coils  52  and  54  and baffles  56  within the chiller coil system  50  shown in  FIG. 5 . Specifically, in the illustrated embodiment, the baffles  56  are shown in open positions. In other words, the baffles  56  are positioned such that the air flow  58  may pass through the upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52 , and the air flow  58  may also flow through bypass flow paths  60  to pass from the upstream side  70  to the downstream side  72 . When the baffles  56  are positioned such that the bypass flow paths  60  are open (e.g., when the system  50  is in a non-cooling mode), the air flow  58  may flow through the paths  60 , bypassing the upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52 . The air flow  58  may continue to pass through the cooling coils  53  when the chiller coil system  50  is in a non-cooling mode in order to maximize inlet air flow from the upstream side  70  to the downstream side  72 . 
     As in  FIGS. 3-5 , the baffles  56  may be controlled manually or by a controller  40 . The controller  40  may be configured to regulate the operation of the baffles  56  based on signals  43  from various sensors  42  (shown in  FIG. 2 ), which may measure temperature, pressure, flow rate, relative humidity, or other operating parameter, upstream  70  and downstream  72  of the cooling coils  53 . Based at least in part on information from these sensors, the controller  40  may be configured to open or close the baffles  56  between the upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52  to optimize compressor efficiency. For example, the controller  40  may calculate a temperature drop from the upstream side  70  to the downstream side  72  of the chiller coil system  50 . If the temperature drop is within a certain range, the controller  40  may either change the position of the baffles  56 , or it may display or otherwise relay this information to an operator, who may adjust the baffles  56  manually. 
       FIG. 7  is a perspective view of an embodiment of the chiller coil system  50 , illustrating one arrangement of the upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52 . However, for clarity purposes, the baffles  56  are not shown in the illustrated embodiment. The upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52  are arranged in horizontal rows that are staggered or alternated (e.g., by upstream and downstream). The upstream plurality of cooling coils  54  includes two rows  74 , each having four cooling coils  53 . The downstream plurality of cooling coils  52  includes three rows  76 , each having four cooling coils  53 . The rows  74  and  76  are arranged so that an upstream row  74  separates each downstream row  76  from top to bottom of the arrangement of cooling coils  53 . The air flow  58  passes from the upstream side  70  to the downstream side  72  by passing through the upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52 , or passing between them (e.g., when the baffles  56  are open). While this configuration includes two upstream rows  74  and three downstream rows  76 , there may be additional or fewer of either. Each row,  74  or  76 , may contain four cooling coils  53 , as shown, or another suitable number, such as three or five. Furthermore, the number of upstream rows  74  may vary from or be equal to the number of downstream rows  76 , and the number of cooling coils  53  within each row may vary from or be equal between upstream row  74  to downstream row  76 . The number of cooling coils  53  and rows  74  and  76  may be determined by implementation specific parameters, such as the size of the cooling coils  53 , the size of the chiller coil system housing  55 , desired amount of air flow, or other parameters. 
       FIG. 8  shows another embodiment of an arrangement of the chiller coil system  50  in which the upstream pluralities of cooling coils  54  and the downstream pluralities of cooling coils  52  are arranged vertically in an alternating fashion. That is, the upstream and downstream cooling coils  54  and  52  are arranged in columns that are staggered. The upstream plurality of cooling coils  54  includes two columns  78 , each containing five cooling coils  53 . Likewise, the downstream plurality of cooling coils  52  includes two columns  80 , each having five coils  53 . The columns  78  and  80  are arranged in an alternating or staggered fashion, with each upstream column  78  being separated from the next upstream column  78  by a downstream column  80 . Each column  78  or  80  may contain any number of cooling coils  53 , such as four, six, or some other suitable number. Furthermore, the number of columns  78  and  80  is not limited to four, and in certain embodiments, the number of upstream columns  78  may not equal the number of downstream columns  80 . For example, there may be three upstream columns  78  and two downstream columns  80 . As in  FIG. 7 , the number of cooling coils  53  and columns  78  and  80  may be determined by implementation specific parameters, such as the size of the cooling coils  53 , the size of the chiller coil system housing  55 , a desired amount of air flow, or other parameter. 
       FIG. 9  shows an embodiment of an arrangement of the chiller coil system  50  in which the upstream plurality of cooling coils  54  is arranged about a perimeter of the downstream plurality of cooling coils  52 . In the illustrated arrangement, the upstream plurality of cooling coils  54  includes of fourteen cooling coils  53  arranged around the perimeter of the downstream plurality of coils  52 . In other words, the upstream plurality of cooling coils  54  surrounds the downstream plurality of cooling coils  52 . In the illustrated embodiment, the downstream plurality of cooling coils  52  includes six cooling coils  53 , arranged in a block formation that is two cooling coils  53  wide and three cooling coils  53  high. The number of cooling coils  53  in each plurality may be changed according to system specifications or preferences and limitations, such as the size of the cooling coils  53 , the size of the chiller coil system housing  55 , or a desired amount of air flow. As described in the previous figures, inlet air flow  58  flows from upstream side  70  to downstream side  72 . In a cooling mode, the baffles  56  may be configured to block flow paths  60  between the upstream plurality of cooling coils  54  and the downstream plurality of cooling coils  52 , thereby directing inlet air flow  58  to pass through the cooling coils  53  in order to chill the air flow  58 . Additionally, the baffles  56  may be opened to enable the air flow  58  to bypass the cooling coils  53  by flowing through the flow paths  60 , thereby reducing the pressure drop while also reducing cooling. 
     The disclosed embodiments include a system and method for allowing inlet air to pass through and/or bypass air conditioning coils in a gas turbine system using a plurality of movable baffles. In this manner, the air conditioning coils may not need to be moved into or out of the air intake system when changing from a cooling mode to a non-cooling mode, and vice versa. The baffles may be opened to enable air to bypass the air conditioning coils (e.g., in a non-cooling mode), and the baffles may be closed to direct air through the air conditioning coils (e.g., in a cooling mode). When in a non-cooling mode, air conditioning coils may add resistance to the airflow entering the compressor, causing a pressure drop in the inlet system which may directly affect turbine efficiency. Depending on the size of the gas turbine, the value of the pressure drop may affect the gas turbine and affect the turbine efficiency. Thus, bypassing the air conditioning coils via movable or removable baffles may enable a lower pressure drop than the level with no air bypassing, thereby improving the efficiency of the gas turbine system and reducing operation costs. 
     This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.