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A Liquid Cooling System with Fixed Thermal Resistance Disclosure Number: IPCOM000234792D
Publication Date: 2014-Feb-05
Document File: 4 page(s) / 208K

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A liquid cooling system is disclosed with fixed thermal resistance. The liquid cooling system maintains a constant air temperature and a heat load. The thermal resistance of the cooling system in independent of liquid flow rate over a wide range.

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This is the abbreviated version, containing approximately 51% of the total text.

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A Liquid Cooling System with Fixed Thermal Resistance

Disclosed is a liquid cooling system with fixed thermal resistance. The liquid cooling system utilizes a liquid to absorb heat from a processor, removes heat from the liquid and then utilizes the cooled liquid to regulate temperature of the processor.

The liquid cooling system consists of numerous narrow channel laminar cold plates on processor modules arranged in parallel and a heat exchanger. In addition, the liquid cooling system is connected to a pump, filter assemblies, a fin and a tube heat exchanger.

The numerous cold plates provide the first stage of cooling for the liquid and are utilized to absorb heat present in the liquid. Here, each cold plate absorbs certain amount of heat from the liquid thereby cooling the entire volume of liquid.

After passing through the numerous cold plates, the liquid passes through the pump

with filter assemblies. Thereafter, the liquid enters the heat exchanger. The heat exchanger is designed in such a way that air temperature and heat load is constant at a fixed airflow. Here, the heat load depends upon temperature of water leaving the heat exchanger. The water leaving the heat exchanger (Tcold) is cooled such that total value of Tcold and Twarm is constant over wide range of airflow rates. Here, Twarm represents the temperature of water that is a function of product of Tcold and specific heat. The liquid cooling system operates by modifying design of an air to water heat exchanger in order to improve the overall effectiveness of cooling the liquid. At a fixed airflow rate, the heat exchanger's efficiency in cooling the hot liquid improves with slower liquid flow rate. The improved cooling efficiency counteracts the negative effect of slower liquid velocity in the processor cold plate.

In this manner the flow rate is reduced without much affecting junction temperatures. The heat exchanger and pump circuit are designed in such a manner that the mean temperature in the cold plate is invariant over a wide range of flowrates. The tube heat exchanger is selected of a size such that the thermal resistance from a processor module to inlet air is constant over a wide range of airflow rates including effects of heavy clogging.

Fig. 1 illustrates a graphical representation of cooling the liquid in the liquid cooling system. As shown in Fig. 1, heat generated by the processor is absorbed by the liquid (water) which passes through the numerous narrow channel cold plates for

cooling. After passing through the cold plates, the water is introduced to the water pump with filter assemblies in Field Replaceable U...