Conserving energy and heating your swimming pool with solar by Energy Efficiency and Renewable Energy Clearinghouse (U.S.)

By Energy Efficiency and Renewable Energy Clearinghouse (U.S.)

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5 Heat Exchangers, The purpose of a solar heat exchanger is to transfer the collected solar heat from a non-freezing fluid into the water in the storage tank. Heat exchangers used in solar heating systems are typically one of three types: o Tube-in-tube o Coil-in- tank o Shell and tube Tube-in-Tube Tube-in-tube heat exchangers are typically used on smaller systems (20 sq. ft. to 600 sq. ft. of collector area). As their name implies, they consist of a tube within a tube. One fluid moves through the innermost tube, and the other fluid moves in the opposite direction through the space between the outer and inner tubes.

All piping 1 inch or larger should be insulated to at least R-6. Exterior piping of all sizes benefits from insulation to R-7. (Figure 2-45) Protection from moisture and ultraviolet radiation is necessary for all exterior insulation. (Table 2-2) Polystyrene or polyethylene should never be used for solar applications. These materials melt at a temperature of 165┬║F, well below the expected temperature for piping in most parts of all systems. 7 COMPONENT OPERATION Good insulation practices require the following: o All exterior joints must be sealed and protected, including those between the insulation and collectors, and roof penetrations.

Figure 2-21) Because the motor and pump are physically separated, periodic lubrication is usually required, and inspection procedures include checking for shaft alignment and bearing wear. 7 COMPONENT OPERATION FIGURE 2-20 Wet Rotor Circulating Pumps: CartridgeType (left) and Magnetic Drive-Type (right). e. e. 3 Piping. Virtually all solar heating system piping is copper tubing. Tubing type ( K, L or M) varies with applications and local code requirements, but follows traditional application rules.

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