Heating Systems in VS .NET

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Heating Systems
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Common residential heating systems come in the following forms: a furnace system, a boiler system, or a heat exchanger. A furnace heats air using gas or electricity and delivers the hot air via air ducts to each room. The furnace is the most common heating system used in the United States. Energy Star qualified units top the list of the most efficient furnaces. A boiler heats water using gas or electricity and then distributes the heated water to radiators throughout your home. Boilers are common and efficient heating units, with those meeting the Energy Star requirements being the most efficient types. Heat exchangers are often used in temperate climates and come in two forms: electric air source heat pumps and geothermal heating systems (Figure 4-18). Electric air source heat pumps are often used in mod-
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Energy-Efficient Home Systems
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FIGURE 4-18 Geothermal heat system
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http://www1.eere.energy.gov/buildings/residential/images/geothermal _energy_1.gif
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erate climates; these units use the difference between outdoor air temperatures and indoor air temperatures to cool or heat your home. Heat exchangers are efficient ways to heat and cool a home. The immediate benefit is that you need only one system to perform both functions. The limitation of these systems is climate, because they rely on a differential in temperature. Much like a Stirling engine, you need both hot and cool areas for these units to produce the required results. What type of heating system is correct for you For small, individual residential homes, small complexes, and small apartment units, a furnace is probably the most effective choice. A furnace should be a central heating unit with short duct systems that allow for the efficient transfer of heat to each room of the home, complex, or unit. Boilers are the next best choice for heat. If heat must be transferred long distances such as to units in an apartment building a boiler is the best choice. Boilers can also be used to supply hot water. A furnace system requires a separate hot water heater. Geothermal heat pumps use heat generated from the ground to heat and distribute heated water or air. These units are commonly used to distribute hot water, but they can also be used to distribute hot and cool air. Because geothermal units use the earth s natural stable temperature, these
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Four units are among the most efficient and comfortable heating and cooling technologies currently available. A photovoltaic system with a geothermal heat pump is an excellent choice for temperate climates. Heat pumps are efficient for heating and cooling and will not use up all of your free electricity. Electricity is another option for heating. Most electrical heating systems are redundant complementary or backup systems. Electricity as a heating system is very costly to use and is not recommended, unless no other choice is available. Even if a large photovoltaic system produces the energy, electric heat is probably not a good option unless you have a very small home.
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The U.S. Department of Energy provides an excellent checklist regarding hiring a contractor to install a new energy-efficient heating system: http://www.energystar.gov/ia/products/heat_cool/HVAC_QI_bidsheet.pdf.
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Geothermal Energy vs. Ground Geothermal
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Before I explain how geothermal heating and cooling actually work, you need to understand the difference between geothermal energy and ground geothermal. Geothermal energy is produced by drilling large wells deep into the ground and using the hot water and steam created there to generate electricity (Figure 4-19).
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FIGURE 4-19 Geothermal power station
http://www.nrel.gov/data/pix/Jpegs/00427.jpg
Energy-Efficient Home Systems The spectacular geyser in Yellowstone Park, Old Faithful, is an excellent example of geothermal underground heat. Most geothermal heat is located deep within the Earth near fault zones. This type of energy is completely free except for the development costs, produces zero emissions, and is a completely carbon-free energy source. The problem is that it is a economically viable solution in only a few areas of the world. Ground geothermal, on the other hand, is a heating and cooling source that is available to most consumers (Figure 4-20). Ground geothermal energy depends on a temperature differential the inside of your home must be at a temperature that differs significantly from the ground temperatures outside your home (which is usually around 60 F). During the summer, the ground source heat pump can actually cool your home. The gas in the heat pump is compressed into the pipes outside of the home until it reaches approximately 130 F. Because the ground surrounding these pipes is at 60 F, and the pipes are in direct contact with the ground, the heat is removed through conduction. Eventually the coolant/gas will chill to ground temperature. The gas is then allowed to expand through the pipes inside the home. When a gas expands it cools, releasing cool energy. The process is repeated until the home reaches the appropriate temperature. In the winter, the system is reversed. The gas in the geothermal system is compressed inside the home. When the gas is compressed, it rises in temperature, heating the home. This system is efficient because it re-
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