On a slight tangent with heat recovery, I have a customer with a compressor room that is always ridiculously hot. There is another part of the factory that is really cold in winter, so I have been asked to put in a smart extractor system. This will dump heat in the summer and then put the heat into the cold areas in winter, whilst keeping the compressor cooler and raising the efficiency. Efficiency is increased, as the colder the air intake temperature, the more dense it is. I guess the smart move would be to have the compressor intake from straight outside, especially in winter.
The heat dump in summer could be used to preheat the incoming water for handwashing etc.
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