Abstract:
Example implementations relate to a thermal management door assembly. One example apparatus includes a first fan assembly including an intake region and an exhaust region. The apparatus also includes a second fan assembly aligned with the first fan assembly. The apparatus further includes a thermal management door assembly positioned between the first fan assembly and the second fan assembly. The thermal management door assembly includes a frame coupled to the first fan assembly and to the second fan assembly. The thermal management door assembly also includes a sealing door movably coupled to the frame to control an amount of air recirculation from the exhaust region to the intake region.

Description:
BACKGROUND 
       [0001]    Fans may be used to provide active cooling of components, such as memory modules and processors, inside a chassis of a computing device. Fans may be used to draw in air outside of a chassis to lower the air temperature inside the chassis. Fans may also be used to expel hot air inside the chassis to lower the air temperature inside the chassis. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0002]    Some examples of the present application are described with respect to the following figures: 
           [0003]      FIG. 1  is a front view of a thermal management dear assembly, according to an example; 
           [0004]      FIG. 2  is a back view of the thermal management door assembly of  FIG. 1 , according to an example: 
           [0005]      FIG. 3A  is a front view of the thermal management door assembly of  FIG. 1  with a sealing door in a closed position, according to an example; 
           [0006]      FIG. 3B  is a front view of the thermal management door assembly of  FIG. 1  with a sealing door in an open position, according to an example; 
           [0007]      FIG. 4  illustrates an amount of air recirculation when the thermal management door assembly of  FIG. 1  with a sealing door in a closed position, according example. 
       
    
    
     DETAILED DESCRIPTION 
       [0008]    As described above, fans may be used to provide active cooling of components inside a chassis of a computing device, such as a server computer. However, some of the hot air inside the chassis may spread to regions where the fans draw in air to reduce the temperature inside the chassis. The hot air is drawn in by the fan and is recirculated inside the chassis. Thus, the effectiveness of the fans is reduced. 
         [0009]    Examples described herein provide a thermal management door assembly to control an amount of hot air recirculation inside a chassis of a computing device. For example, a thermal management door assembly may include a frame positioned between a first fan and a second fan assembly. The thermal management door assembly may include a sealing door movably coupled to the frame to control an amount of air recirculation from exhaust regions of the fan assemblies to intake regions of the fan assemblies. In this manner, examples described herein may reduce an amount of hot air recirculation inside a chassis of a computing device. 
         [0010]    Referring now to the figures,  FIG. 1  is a front view of a thermal management door assembly  100 , according to an example. Thermal management door assembly  100  may include a frame  102  and a sealing door  104  movably coupled to frame  102 . Frame  102  may include a plurality of retaining tabs, such as retaining tabs  106 - 108  to retain sealing door  104 . In some examples, retaining tabs  106 - 108  may be L-shaped. Frame  102  may also include an opening  110 . Frame  102  may further include a first receptacle  112  to receive an attachment mechanism from a chassis of a computing device. 
         [0011]    Sealing door  104  may include a body region  114 . Body region  114  may have dimensions (e.g., height and width) that are equal to or greater than dimensions of opening  110 . Thus, sealing door  104  may control an amount of air recirculation between two fan modules by varying the amount of exposed space in opening  110  that is covered/blocked by sealing door  104 . For example, when sealing door  104  is in a closed position, sealing door  104  may at least partially cover opening  110 . Thus, opening  110  may have a first amount of exposed space. In some examples, open  110  may not nave any exposed space when sealing door  104  is in the closed position. When sealing door  104  is in an open position, opening  110  may have a second amount of exposed space that is greater than the first amount of exposed space. 
         [0012]    Sealing door  104  may also include a first flange  116  and a second flange  118  extending from body region  114 . Flanges  116 - 118  may be dimensioned to come into contact with retaining tabs  106 - 108  to control movement of sealing door  104 . The operation of sealing door  104  is described in more detail with reference to  FIGS. 3A-3B and 4A-4B . 
         [0013]      FIG. 2  is a back view of thermal management door assembly  100  of  FIG. 1 , according to an example. Thermal management door assembly  100  may include a second receptacle  202  to receive an attachment mechanism from a chassis of a computing device. Second receptacle  202  may extend from frame  102  in an opposite direction of first receptacle  112 . As illustrated in  FIG. 1 , retaining tabs  106 - 108  and sealing door  104  may be located on the front side of frame  102 . However, it should be understood that retaining tabs  106 - 108  and sealing door  104  may also be located on the back side of frame  102 . 
         [0014]      FIG. 3A  is a front view of thermal management door assembly  100  with sealing door  104  in a dosed position, according to an example. During operation, thermal management door assembly  100  may be positioned between two fan modules  302 - 304  such that frame  102  is in physical contact with regions of fan modules  302 - 304  to reduce an amount of through space. Thermal management door assembly and fan modules  302 - 304  may be retained to a basepan  306 . In some examples, basepan  306  may be part of a chassis. 
         [0015]    In some examples, thermal management door assembly and fan modules  302 - 304  may be retained to basepan  306  via pins (not shown in  FIG. 3A ) extending from base an  306 . A first pin may be used to retain fan module  302  via a receptacle  308  of fan module  302  and a second pin may be used to retain fan module  304  via a receptacle  310  of fan module  304 . The first pin and the second pin may be in a staggered configuration to receive receptacles  112  and  202  (not shown in  FIG. 3A ). As illustrated in  FIG. 3A , sealing door  104  is in a closed position so that opening  110  is covered/blocked by sealing door  104 . In some examples, the movements of sealing door  104  may be passive. Thus, when sealing door  104  is in the closed position, pressure differential across fan modules  302 - 304  and gravity may help sealing door  104  remain at the closed position. 
         [0016]      FIG. 3B  is a front view of thermal management door assembly  100  with sealing door  104  in an open position, according to an example. During operation, sealing door  104  may be moved (e.g., by a user) with respect to an axis  12  so that at least portion of opening  110  is exposed. Axis  312  may be perpendicular to fan modules  302 - 304  and/or as an  306 . At least a cable  314  may be passed through the exposed portion of opening  110  from the back side of thermal management door assembly  100  to the front side of thermal management door assembly  100 . Cable  314  may be plugged into an electrical connector  316  of a computing device. After cable  314  passes through opening  110 , sealing door  104  may slide down to rest on top of cable  314 . Thus, the amount of exposed space in opening  110  may be controlled by a height or thickness of cable  314 . Further, the amount of exposed space in opening  110  may also be reduced as comparing to keeping sealing door  104  at the same position after cable  314  has passed through opening  110 . 
         [0017]      FIG. 4  illustrates an amount of air recirculation when thermal management door assembly  100  of  FIG. 1  with sealing door  104  in a closed position, according to an example. During operation, fan module  302  may draw in air via a first intake region  402  and expel the air into a chassis of a computing device via a first exhaust region  404 . The air flow through fan module  302  may be indicated by arrows  406 - 408 . Fan module  304  may also draw in air via a second intake region  410  and expel the air into the chassis via a second exhaust region  412 . The air flow through fan module  304  may be indicated by arrows  414 - 416 . 
         [0018]    Some of the air flow through fan module  302  and/or some of the air flow through fan module  304  may spread or move towards exhaust regions  404  and  412  as indicated by arrows  418 - 420  (“outflow airflow”). When sealing door  104  is in the closed position, the recirculating airflow may be blocked by sealing door  104  and may not be recirculated by fan modules  302  and/ 304 . Thus, the amount of air recirculation from exhaust regions  404  and  412  to intake regions  402  and  410  may be reduced. 
         [0019]    The use of “comprising”, “including” or “having” are synonymous and variations thereof herein are meant to be inclusive or open-ended and do not exclude additional unrecited elements or method steps.