In areas in which the air temperature drops very low in thewinter, the exterior unit of
Chapter 11, Problem 22(choose chapter or problem)
In areas in which the air temperature drops very low in thewinter, the exterior unit of a heat pump designed for heatingis sometimes buried underground in order to use the earthas a thermal reservoir. Why is it worthwhile to bury the heatexchanger, even if the underground unit costs more to purchaseand install than one above ground?
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