Geothermal Overview
Sunday, 01 March 2009 15:36
Eli
Geothermal energy (also know as ground source, geoexchange or renewable energy) is energy taken from earth, and used to heat or cool buildings depending on season. The basic principle is that in the certain depth in the ground the temperatures are the same throughout the year (about 55 degrees F in New England area) thus giving possibility to retrieve heat during winter time or cold during summer using specific devices called heat pumps. Even though geothermal exchange principle has been known for decades, in residential applications it is relatively new and very fast growing.
Last Updated on Sunday, 19 April 2009 06:56
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How Heat Pump Works
Sunday, 01 March 2009 15:46
Eli
The exchange of energy in geothermal system is done by the heat pump – the device that works similar to the refrigerator. The heat pumps, refrigerators and air conditioners all work in the same manner: by pumping the refrigerant through a closed loop (ground loop in geothermal systems), that has two distinct temperature zones – cold and hot.
Last Updated on Sunday, 19 April 2009 11:57
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Geothermal Heat Exchanger
Sunday, 01 March 2009 15:38
Eli
There are two major types of geothermal ground heat exchangers: horizontal and vertical. Horizontal ground heat exchanger means that the pipes are buried in the ground in trenches. There can be single or multiple layers of pipe in the trench, depending on their depths, or the pipe can be buried forming so-called slinky. In cases of multiple layers or slinky we have to keep in mind to allow enough soil between layers or otherwise pipes can interfere in terms of thermal conductivity reducing overall system performance. Vertical ground heat exchanger means that pipes are buried in one or more vertical boreholes that can be 100-500 feet deep.
Last Updated on Sunday, 19 April 2009 07:03
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Heat Pumps
Sunday, 01 March 2009 15:44
Eli
Ground source heat pumps are electrically powered systems that can provide cooling, heating and hot water much more efficiently and less expensively than conventional heating and air-conditioning technologies using ground’s relatively constant temperature. There are two main categories of ground source heat pumps - open loop, and close loop, but major part of all household installations is the closed loop system. The closed loop geothermal system circulates the water-based antifreeze solution through a series of pipes buried in the ground, transferring heat to or from the ground, depending on the mode heat pump is working in.
Last Updated on Sunday, 19 April 2009 07:00
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Geothermal Equipment
Sunday, 01 March 2009 14:45
Eli
In this article we will describe all necessary equipment for setting geothermal system: heat pump, pipes for ground heat exchanger, grout, and antifreeze for ground heat exchanger circulating fluid.
Last Updated on Sunday, 19 April 2009 07:04
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