Energy crisis hell as most households CANNOT afford heat pumps despite UK subsidy (msn.com)
Z.
it probably does not need to be copper - stainless steel or even aluminum may well do - we are only exchanging heat between water and a refrigerant like propane that is pumped to be liquid or gas at different points in the cycle.
Copper is handy for hand-built small quantity systems as it can be hard soldered or brazed, and it does not corrode or embrittle easily, but it is not the only option.
The complexity of the heat pump part is not much higher than that of car air con, which pumps a few kW up hill against a temperature gradient of 20-30 degrees. In some ways car aricon gets a harder life as the pump speed is revs dependent, and there is often a need to cool down from a very hot start when a car has been parked in the sun, so the pressures go all over the place, a fixed domestic system has neither of those problems, though the MTBF should be longer. (though car air con does not use flammable gasses..)
Costs really mount when you want to pump heat out of the ground and start to sink boreholes etc.
Mike.
it probably does not need to be copper - stainless steel or even aluminum may well do - we are only exchanging heat between water and a refrigerant like propane that is pumped to be liquid or gas at different points in the cycle.
Copper is handy for hand-built small quantity systems as it can be hard soldered or brazed, and it does not corrode or embrittle easily, but it is not the only option.
The complexity of the heat pump part is not much higher than that of car air con, which pumps a few kW up hill against a temperature gradient of 20-30 degrees. In some ways car aricon gets a harder life as the pump speed is revs dependent, and there is often a need to cool down from a very hot start when a car has been parked in the sun, so the pressures go all over the place, a fixed domestic system has neither of those problems, though the MTBF should be longer. (though car air con does not use flammable gasses..)
Costs really mount when you want to pump heat out of the ground and start to sink boreholes etc.
Mike.
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