Expansion tank Baseboard radiator in Visual Studio .NET

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Expansion tank Baseboard radiator
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Pump
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Fig. 14-9. Series-loop piping configuration for forced-hot-water heating system. One pipe In a one-pipe distribution configuration, as with the series loop, a single pipe makes a complete circuit from the boiler and back again, serving as both the supply and the return. In this case, however, rather than the radiators being integral with the supply pipe, they are attached to it by two risers, one connected to each end of the radiator. (See FIG. 1410.) Each radiator will also have a shutoff valve located at the inlet riser. Each radiator can be shut without affecting the water flow in the
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supply main. Consequently, this system can provide room-by-room heat control. However, as with the series loop, there is a considerable temperature difference between the water entering the first and last radiators. To compensate for the cooler water entering the radiators downstream, larger radiators are often installed. They emit heat comparable to the smaller ones closer to the boiler. Two pipe The two-pipe distribution configuration is the most costly to install, but it overcomes the deficiencies of the other configurations. There are two main pipes, one for the supply and the other for the return. The inlet and outlet ports of the radiators are attached to the mains by risers. (See FIG. 14-11.) The cool water leaving the radiator does not mix with the hot water flowing through the supply main, so the temperature difference between the water entering the first and last radiator is small. Even though both the one- and two-pipe configurations will provide heat control for individual rooms if the radiator shutoff valve is manually closed or partially closed, the configurations are also often used in homes with zone heating. Zone heating is automatic. All
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Radiator Baseboard First floor Expansion tank Main Boiler Basement Circulation pump Chimney
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Fig. 14-10. One-pipe distribution configuration for forced-hotwater heating system.
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Return main
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Hot-water systems 195
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Radiator or convector
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Riser
Riser
Air-vent valve
Return main Supply main
Pressure-relief valve Water-supply line
Plug expansion tank
Hand valve Pressure-reducing valve Booster pump Drain cock
Fig. 14-11. Two-pipe distribution configuration for forced-hot-water heating system. that has to be done is to set the thermostat to the desired temperature for that portion of the house. Radiators As discussed previously, the optimum location for a radiator is along an outside wall, preferably near or under a window. There are three basic types of radiators found in hot-water heating systems: freestanding cast iron, freestanding convector, and baseboard convector. Freestanding castiron radiators are found mostly in older 196 Heating systems I homes. Unless an old home is being restored, a freestanding radiator is usually considered undesirable. Many clients have asked whether the radiators can be replaced with the newer finned-tube baseboard radiators. Yes, they can. Baseboard convector radiators are usually preferred because they distribute the heat better than cast-iron or freestanding convector radiators and are less conspicuous. They achieve an even temperature throughout the room because they distribute the heat near the
floor. Natural convection causes the heated air to rise and warm the outside wall. Panel heating Another method of heating using a forced-hot-water system is to embed the distribution piping into the walls, floors, or ceilings and let those areas (panels) function as radiators. (See FIG. 14-12.) The heat from the distribution piping is conducted to the surface of the panels; which in turn heats the room by radiation and convection. This system produces a very uniform temperature distribution and is particularly effective when the heating panel is the floor slab in a basementless house. Controls In addition to the thermostat, hot-water systems have safety and operational controls. In a simple forced-hot-water system without individual zones, there is a high-temperature limit control that prevents the boiler water from exceeding a preset temperature and a controller for the circulating pump. Depending on the system design, the circulating pump can operate in any one of three modes: constant-running circulator, aquastat-controlled circulator, and relaycontrolled circulator. In the constant-running circulator, the pump is energized by a manual power switch
and operates continuously during the heating season. When the thermostat calls for heat, it fires the burner that heats the boiler. When the heating season is over, the circulating pump must be manually shut off. Sometimes the homeowner forgets to shut the pump, and the pump runs all summer. This type of operation is somewhat wasteful of electrical energy. However, this wastefulness must be weighed against the fact that intermittently operated circulating pumps tend to break down sooner than continuously operated pumps. The constant starting and stopping causes the bearings to wear out sooner. A constant-operating circulating pump is the least expensive to install because there is no relay or temperature controller. It can be converted to either aquastatcontrolled or relay-controlled. In the aquastat-controlled circulator mode, as with the constant-running circulator, the thermostat will control only the burner. When the boiler water reaches a preset temperature (approximately 120 F), the circulator pump begins to operate. After the thermostat is satisfied and shuts off the burner, the circulator continues to operate until the water temperature drops below the temperature setting of the circulator control. In the relay-controlled mode,
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