Tankless Water Heater in .NET

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Tankless Water Heater
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Tankless water heaters (Figure 4-9) are another popular alternative to traditional water heaters. Tankless water heaters differ from traditional water heaters in that they do not contain a reservoir of heated water. Tankless units use gas or electricity to heat the water on demand. This means that the energy is used only when you require hot water. Traditional hot water heaters store large amounts of hot water. This is energy wasteful, however, because the hot water is not being used most of the time. Because no tank is required, tankless units are great when space is limited. They are designed to function for 20 years or more. Tankless heaters may also quality for tax rebates, particularly if you install an Energy Star rated system. Two kinds of tankless systems are available: whole house and individual heaters. Similar to a conventional water heater, a whole house water heater is a single unit that is placed close to where you will use the water. The second option calls for multiple small tankless units installed at each location of use.
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FIGURE 4-9 Tankless water heater
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Electric tankless water heaters are also available in 12-volt models that can be powered directly from a PV system.
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Heat Pump
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Heat pump hot water systems (Figure 4-10) offer another efficient alternative to traditional hot water heaters. A heat pump system depends on a differential in temperature: A lowpressure liquid refrigerant is vaporized in the heat pump s evaporator and passed into the compressor. The refrigerant pressure and temperature increase. The heated refrigerant goes through a condenser in the storage tank that transfers the heat in the refrigerant to the water stored within the unit. When the refrigerant delivers its heat to the water, it cools
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Bypass Second Vapor Thermal Refrigerant Valve Expansion Valve
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FIGURE 4-10 Heat pump
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and condenses. The refrigerant then passes through an expansion valve, where the pressure is reduced and the cycle begins again. Electric heat pumps can be an excellent complement to PV solar power. They are often used in temperate climates, which provide ample sunlight for PV and moderate, continuous usage of electricity. The electricity is created and used onsite the perfect complement of production and usage.
Gas Condensing Hot Water Heater
The gas condensing hot water heater (Figure 4-11) is similar to a conventional hot water heater with one exception: A conventional hot water heater vents hot gases as it heats water, but the gas condensing heater does not vent hot gases, instead reusing these gases to add heat energy to the stored water. The gas condensing hot water heaters are better and more efficient than traditional hot water heaters, but they are not as efficient as solar, tankless, or heat pump systems.
High-Efficiency Gas Storage Water Heater
High-efficiency gas storage water heaters are similar to traditional gas water heaters but have a few efficiency improvements. In these units, nat-
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FIGURE 4-11 Gas condensing water heater
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ural gas is used to heat and store hot water for future use. Choose an Energy Star rated system.
Cooling Systems
When it comes to cooling your home, two options are available: room air conditioners or central air conditioning.
Room Air Conditioners
When choosing a room air conditioner (Figure 4-12), the least efficient of the two choices, consider a few factors. Be sure that you choose a unit that will meet your needs: consider the size of the room(s) you want to cool and how well the room(s) is insulated.
Energy-Efficient Home Systems
FIGURE 4-12 Window air conditioner
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Air conditioners are rated in British thermal units (Btus). Most units display the following information on the box: the Btu rating, recommended square feet of coverage, and/or number of rooms that can be cooled. Consider the following as a rule of thumb: A 5000 Btu unit will cool one room. An 8000 Bty unit will cool three rooms. A 10,000 Btu or larger unit will cool an entire floor of a house. When buying the unit, notice whether it requires 110, 220, or 12 volts of electricity. Be sure that you have a dedicated electrical outlet that provides the correct amount of amperage: using the wrong amperage could cause a fire. Some small units are available in 12-volt models. When installing a PV system, include the option of allowing for expansion of 12-volt products that can use the electricity produced onsite. When choosing an air conditioning unit, always buy an Energy Star rated model, and look for tax credits or rebates before you purchase. Air conditioning is a luxury; however, the U.S. government will provide tax credits and rebates to help you enjoy your luxury efficiently.
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