Patent Application
20090211277
This disclosure relates generally to the field of cooling systems and, more particularly, to a system and method for cooling a heat generating structure.
A variety of different types of structures can generate heat or thermal energy in operation. To prevent such structures from over heating, a variety of different types of cooling systems may be utilized to dissipate the thermal energy, including air conditioning systems.
According to one embodiment of the disclosure, a cooling system for a heat generating structure comprises a first cooling segment and a second cooling segment. The first cooling segment and the second cooling segment each respectively comprise a cooling segment conduit and at least one cooling segment tube. The cooling segment conduits are operable to receive a fluid coolant and dispense of the fluid coolant after the fluid coolant has received thermal energy. The at least one cooling segment tubes are in thermal communication with both the cooling segment conduits and the heat generating structure. The at least one cooling segment tubes have a cooling fluid operable to transfer thermal energy from the heat generating structure to the cooling segment conduits. The cooling segment conduits transfer thermal energy from the cooling fluid to the fluid coolant. A heat transfer rate associated with the first cooling segment is substantially similar to a heat transfer rate associated with the second cooling segment.
Certain embodiments of the disclosure may provide numerous technical advantages. For example, a technical advantage of one embodiment may include the capability to use heat pipes over lengths that heat pipes traditionally can not be used. Other technical advantages of other embodiments may include the capability to tune a heat transfer rate associated with one set of heat pipes and a condenser to the heat transfer rate of another set of heat pipes and a condenser. Yet other technical advantages of other embodiments may include the capability to tune heat transfer rates associated with sets of heat pipes and condensers by adjusting temperatures and flow rates of fluid traveling through the condensers. Still yet other technical advantages of other embodiments may include the capability to adjust characteristics of condensers including, but not limited to, using different heat transfer pin fins and different cross sectional areas in order to tune heat transfer rates associated with sets of heat pipes and condensers.
Although specific advantages have been enumerated above, various embodiments may include all, some, or none of the enumerated advantages. Additionally, other technical advantages may become readily apparent to one of ordinary skill in the art after review of the following figures and description.
For a more complete understanding of example embodiments of the present disclosure and its advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:
It should be understood at the outset that although example embodiments of the present disclosure are illustrated below, the present disclosure may be implemented using any number of techniques, whether currently known or in existence. The present disclosure should in no way be limited to the example embodiments, drawings, and techniques illustrated below, including the embodiments and implementation illustrated and described herein. Additionally, the drawings are not necessarily drawn to scale.
Heat pipes are a tempting solution for applications that require low temperature gradients. Specifically, when heat pipes are well designed, such heat pipes are almost gradient-free over the length of the evaporator. Such heat pipes, however, have the disadvantage of being sensitive to orientation.
As a non-limiting example of operation, similar or different fluids may be contained in the heat pipes 130 and the condenser 140. The condenser may include an inlet 142 to receive fluid and outlet 148 to dispense of fluid. As the heat generating structure 120 operates, thermal energy from the heat generating structure 120 is transferred to the heat pipes 130, for example, through a cold plate, causing the fluid in the heat pipes 130 to evaporate. Upon evaporation, the fluid in the heat pipes 130 migrates towards the condenser 140, for example, in the form of vapor. The thermal energy contained in the fluid traveling through the heat pipes 130 is transferred to the fluid in the condenser 140 and carried away, for example, through the outlet 148 of the condenser 140. Upon release of the thermal energy, the condensed fluid in the heat pipes 130 may migrate back down towards the far end of the heat pipes 130.
The configuration 100 of
As will be described further below, the cooling segments 225, 235 in particular embodiments may be part of a cooling loop 300 that include features such as a fluid source 260, pumps 250A, 250B, and a return line 270. Although a specific cooling loop 300 has been shown in
Each respective cooling segment 225, 235 may operate in a similar manner as described with reference to the configuration 100 of
The condensers 240A, 240B may include inlet 242A, 242B to receive fluid and outlets 248A, 248B to dispense of fluid. As the heat generating structure 220 operates, thermal energy from the heat generating structure 220 is transferred to the heat pipes 230A, 230B through any suitable thermal energy transfer mechanism, including but not limited to, a cold plate. The transfer of thermal energy causes the fluid in the heat pipes 230A, 230B to evaporate. Upon evaporation, the fluid in the heat pipes 230A, 230B migrates towards the condensers 240A, 240B, for example, in the form of vapor. The thermal energy contained in the fluid traveling through the heat pipes 230 is transferred to the fluid in the condenser 240A, 240B and carried away, for example, through the outlets 248A, 248B of the condensers 240A, 240B. Upon release of the thermal energy, the condensed fluid in the heat pipes 230A, 230B may migrate back towards the far end of the heat pipes 230A, 230B. To compensate for that fact that the heat pipes 230B are adversely oriented (for example, working against gravity in the transport to the far end of the heat pipes), heat pipes 230B are shorter than heat pipes 230A.
In operation, cooling segment 225 has different thermal operating characteristics than cooling segment 235. Specifically, according to one embodiment, cooling segment 225 has a different effective thermal conductivity or heat transfer rate than cooling segment 235. Because it desirable to have uniformly cool the heat generating structure 220 (e.g., avoiding hot spots or large temperature gradients), it is desirable for the heat transfer rate of cooling segment 225 to be substantially the same as cooling segment 235. In order to make the heat pipes 230A, 230B have substantially the same heat transfer rate, a variety of techniques may be utilize to tune one or both of the cooling segments 225, 235. Examples of such tuning techniques will be described below.
As one tuning technique, the flow rate entering one or both of inlets 242A, 242B of condensers 240A, 240B may be adjusted or varied. Such an adjustment of the flow rate may be carried out, for example, in certain embodiments through modifications to a speed of a pump 250A, 250B providing fluid to each respective condenser. Other techniques may also be used to adjust the flow rate entering the condensers 240A, 240B.
As another tuning technique, the temperature of the fluid entering one or both of inlets 242A, 242B of condensers 240A, 240B may be adjusted or varied. Any of a variety of techniques may be used vary the temperature of the fluid, including changing characteristics of the fluid source 260. In particular embodiments, a mixture of different temperature fluids may be adjusted to quickly change the temperature fluid entering one or both of the inlets 242A, 242B. Additionally, in particular embodiments, fluid may enter one cooling segment 225 before the other cooling segment 235.
As yet another tuning technique, different fin stock (e.g., wavy, straight, pin, staggered, etc.) may be used in one or both of the condensers 240A, 240B. Other surface enhancement/stream changing characteristics may also be utilized, according to other embodiments.
As yet another tuning technique, the channel characteristics (e.g., width, depth) of the condensers 240A, 240B can be modified to adjust, among other things, the velocity of the fluid moving through the condenser 240A, 240B.
As yet another tuning technique, pressures associated with the fluid entering the condensers 240A, 240B may be modified to adjust a heat transfer rate of the cooling segments 225, 235.
In addition to the above specific techniques, a variety of other techniques may additionally be utilized as will become apparent after review of this specification. Furthermore, in particular embodiments, combinations of techniques may be utilized.
In particular embodiments, the adjustments or variations provided for in these techniques may be done real-time, for example, using sensors that monitor the dynamics of how the cooling segments 225, 235 are operating. As just one example, intended for illustrative purpose only, sensors 227, 237 may monitor characteristics (e.g., temperature, velocity, pressure) of fluid exiting the outlets 248A, 248B and provide dynamic feedback to other components of the cooling loop 300, for example to adjust pumps 250A, 250B, fluid source 260, channel width characteristics of condensers 240A, 240B, or other components, or combinations of the preceding. Although one example of a sensor has been shown, sensors may also located in other locations.
While this disclosure has been described in terms of certain embodiments and generally associated methods, alterations and permutations of the embodiments and methods will be apparent to those skilled in the art. Accordingly, the above description of example embodiments does not constrain this disclosure. Other changes, substitutions, and alterations are also possible without departing from the spirit and scope of this disclosure, as defined by the following claims.
