Consider you work for a company that just purchased a new supercomputer worth mi

Question

Consider you work for a company that just purchased a new supercomputer worth millions. The computer chips will work more quickly if they are cold, and if the computer chips overheat you will be fired in disgrace, and an Engineer from Alabama will be hired in your place, thus mocking you and your proud University. As a member of a preliminary design team you are asked to design a refrigeration system for these chips based on the following criteria:
a. T surroundings = 20 C
b. The chips will dissipate 40,000W of heat you must remove
c. The chips should be at –20 C during steady-state
d. You desire a condenser temperature at the condenser exit to be 20 C above the
surroundings to efficiently reject heat
e. You desire the evaporator temperature to be 20 C below the chip temperature for
efficient heat transfer from the chips.
f. As a first look, you may consider the isentropic efficiency of the compressor to be 100%
Your design team has narrowed the refrigerant choices to R-22 or R-134a (see NIST web site for data).
1) Solve for the working fluid mass flow rates of both refrigerant choices.
2) Solve for the compressor ratios of both refrigerant choices (compressor
ratio = P high/P low)
3) Could you have used water as a refrigerant? Why/why not?
4) explain in a succinct way what is the best refrigerant to choose and exactly
why. Justify your choice based on COP, flow rate, and required pressures.
Keep it concise and to the point.

Explanation / Answer

www.howtomakeawebsite.net/ www.thocp.net/hardware/supercomputers.htm

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