Florida Heat Pump Geothermal Units

November 1st 2013, Heat Pump, Khader Khan, 0 comments


In winter, fluid circulating through the system's earth loop or well absorbs stored heat from the ground and carries it indoors. The indoor unit compresses the heat to a higher temperature and distributes it throughout the building, as if it were an air conditioner running in reverse. In summer, the geothermal HVAC system pulls heat from the building and carries it through the earth loop/pump to reinjection well, where it deposits the heat into the cooler earth/aquifer.

The real-world average COP of MODULATING air-to-water heating systems (eg Daikin Altherma) is substantially better then the on/off versions, and are quite comparable to mini-split system COPs when uses with low-temp radiation that can meet the design condition loads with 120F water. For very-low-temp radiation (concrete slab radiant floors) they can beat mini-split efficiency by a narrow margin.

These air-source heat pumps are viable today, even in cold climates, because of dramatic improvements in the past few decades. Much of this innovation has been driven by Japanese companies, including Mitsubishi, Daikin, Fujitsu, and Sanyo (now part of Panasonic).