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Why build a Stirling Engine?

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Ian S C	28/07/2010 13:07:24
7468 forum posts 230 photos	John you could of course use the Stirling engine in reverse in the case of the server farm situation, its being done with miniature systems in computers now, this is quire an effective cooling method, and not as messy as water cooling. Ian S C
Stub Mandrel	30/07/2010 20:32:36
4318 forum posts 291 photos 1 articles	Not so John, According to an article in New Scientist there are already server farms doing this. Basically these have huge racks of computers all cblowing out hot air which has to be pumped out of the building. Passing that hot air over a heat engine on the way out dioesn't affect the effectiveness of the air pumped in at the other end of the building for cooling the computers. - its not like the engines are fitted in the computer cases. With a river the energy is all derived from the head of water. The flow of air is only the mechanism for transferring heat not the source of energy. Slowing the flow will cause the air to get hotter RAISING the temperature difference and hence the efficiency of the heat engines (and probably causing your computers to go pop). It's not unlike a condensing tumble dryer, which has a simple heat exchanger that pre-heats the air before it goes into the heater while extracting heat and water from the air on the way out. A lot more effcient and it allows the dry air to be used to warm the building in winter. By your argument the extra load on the motor from circulating the air would exceed the efficeincy gains from teh heat exchanger, but it doesn't. No breaking of the rules of thermodynamics, you can improve efficiency but never work magic. Neil

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