Posted by missouri massey man on March 03, 2014 at 07:00:21 from (108.90.234.133):
In Reply to: heat pump posted by schrade on March 02, 2014 at 17:56:03:
If there is an unlimited supply of 60 degree air available within that structure that costs nothing to produce, then yes it is viable. If you have to pay to raise that unlimited supply to that 60 degree temp it becomes a moot point. By "unlimited" I mean the quantity of 60 degree warm air available would have to at the very minimum be adequate to match the rate of the heat loss of the house at the design temp of the system... In the middle midwestern states that design temp is 5 F for heating and 95 F for cooling.
When a heat load calculation is performed for a heat pump, there is a "balance point" below which the heat pump cannot adequately supply enough heat to satisfy the heat loss requirement. At that point, typically strip heat is then staged on to compensate. Some manufacturers allow the HP to continue to operate and others lock them off at that point.
Twelve miles north of me is a series of huge caves used for warehouse space for a tire shop. The owner of the shop built a monstrous house on top of the cave and had air to air heat pumps installed with the outdoor units inside the caves where the temperature is a continual 56 degrees year around. He has a very efficient system(s) due to this free unlimited "indoor" supply of reasonably warm air to transfer "heat" from in the winter and a resonably cool air to transfer heat "to" in the summer.
So the answer to your question is yes, if the available heat content is free and within the realm of temp that won't be detrimental to the cooling cycle in the summer.
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