As more campuses consider sustainable design and LEED certification for facilities, one technology that has seen increased interest is ground-source heat pump systems or GSHP systems. GHSP systems are traditionally used for space heating and cooling, and also domestic hot water heating. Geothermal systems work by using the earth’s surface to alternately heat and cool water, depending on the time of year.
The basic components of the GSHP system are a loop field, heat pumps, and a piping loop throughout the building’s interior mechanical space. A loop field is a heat exchanger that is installed in the ground adjacent to a building. Specific types of heat pumps must be used since they require an extended temperature range for proper operation.
Although GSHP systems have higher initial costs, their operating costs can be up to 40 percent lower than a conventional heating or cooling system—more than recovering the initial investment costs over the life of the system. The maintenance costs are also typically lower than conventional systems since there is less equipment installed at the facility. This is due to the loop field essentially replacing heating and cooling generating equipment, such as boilers, cooling towers, and chillers.
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