Heat pumps don’t create heat. They take existing heat and move it. Anyone with a refrigerator has witnessed the operation of a heat pump. Refrigerators collect heat from the unit’s interior and moves it to the exterior for cooling purposes. Unlike a refrigerator, a heat pump can reverse itself. An air-source heat pump, for example, can extract heat from outdoor air and pump it indoors for heating purposes.
A geothermal heat pump works the same way, except that its heat source is the warmth of the earth. The process of elevating low-temperature heat to over 100° F and transferring it indoors involves a cycle of evaporation, compression, condensation and expansion. A refrigerant is used as the heat-transfer medium which circulates within the heat pump. The cycle starts as the cold, liquid refrigerant that passes through a heat exchanger (evaporator) and absorbs heat from the low-temperature source. Fluid from the gaseous refrigerant then passes through a compressor where the refrigerant is pressurized, raising its temperature to more than 180° F. The hot gas then circulates through a refrigerant to air heat exchanger where heat is removed and pumped into the building at about 100° F. When it loses the heat, the refrigerant changes back to a liquid. The liquid is cooled as it passes through an expansion valve and begins the process again. To work as an air conditioner, the system’s flow is reversed.
“Such an incredible organization! The service technician, Sean was professional, polite and extremely thorough. He took time to make sure…”
“The gentlemen who inspected my furnace were knowledgeable and honest. They gave me a full range of options for replacing…”
“Arronco has has nicest, most knowledgeable and conscientious team of providers. Our most recent service appointment continued the trend. We're…”