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HVAC Guide - Combined Heating And Cooling Systems
By Jackie LoBuglio - JD Supply HVAC Heating & Cooling Outlet
Heating Systems and Cooling Systems, often called Heating, Ventilating and Air Conditioning (HVAC) Systems, have been around for many years. In this HVAC Combined Heating & Cooling Systems Guide we describe both Residential and Commercial Systems that allow for Both Heating And Cooling. You may also wish to refer to the sections on Residential Heating Systems, Commercial & Industrial Heating Systems, Residential Cooling Systems, and Commercial & Industrial Cooling Systems.
3.1. Residential Heating & Cooling Systems
Many homes, all across North America, have both the heating system and the cooling system combined into one single unit. There are several types of residential heating and cooling systems available. Here we consider Standard Heat Pumps and Geothermal Heat Pumps
3.1.1. Residential Standard Heat Pumps
In residential HVAC applications, the term Heat Pump normally refers to a vapor-compression refrigeration device that includes a Reversing Valve and optimized Heat Exchangers so that the direction of heat flow may be reversed.
The reversing valve switches the direction of refrigerant through the cycle, and therefore the heat pump may deliver either heating or cooling to a home.
In cooler climates the default setting of the reversing valve is heating, and in warmer climates the default setting is cooling. Because the two heat exchangers, the condenser, and evaporator, must swap functions, they are optimized to perform adequately in both modes. As such, the efficiency of a reversible heat pump is typically slightly less than 2 separately-optimized machines.
3.1.2. Residential Geothermal Heat Pumps
Geothermal Heat Pumps are also known as "GeoExchange" systems or "Ground-Source Heat Pumps".
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Summer Mode, the Earth is a heat sink. The Heat Pump sends relatively warm water from the building to be cooled by the relatively cool Earth. |
Winter Mode, the Earth is a heat source. The Heat Pump sends relatively cool water from the building to be warmed by the relatively warm Earth. |
The Residential Geothermal Heat Pump is a heating and/or air conditioning system that uses the Earthīs ability to store heat in ground or water thermal masses. These Geothermal systems operate based on the stability of underground temperatures (the ground a few feet below surface has a very stable temperature throughout the year), depending upon locationīs annual climate.
A Geothermal Heat Pump uses that available heat in the winter and puts heat back into the ground in the summer. A geothermal system differs from a conventional furnace or boiler by its ability to transfer heat versus the standard method of producing heat. As energy costs continue to rise, and pollution concerns continue to be a hot topic, geothermal systems may hold a solution to both of these concerns.
Geothermal heat pumps, which can be used in almost any region, should also be distinguished from geothermal heating. Geothermal Heating is used in areas where exceptionally high underground temperatures, such as those at hot springs and steam vents, are used to heat indoor spaces without the use of a heat pump.
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