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This means it does not require a fill/drain assembly, expansion tank or check valve. However, because the loop is not always completely filled, the pump must be large enough to overcome not only friction, but gravity as well when filling the collectors. 4 BASIC CONFIGURATION OF DRAINDOWN SYSTEMS A third method allows the storage water (under street pressure) to enter the solar collectors and piping. When solar energy is available, a pump circulates the water through the system to move heat into storage.

7 COMPONENT OPERATION 22 For this reason, they are nothing but a plastic or metal absorber plate. insulation or glazing is used. (Figure 2-1 9) No frame, Indoor pools used throughout the entire year typically use an indirect system. The collectors are standard glazed flat-plate units with metal absorbers. 2 Pumps. The wetted components of pumps used for moving water are normally constructed from bronze or stainless steel. These materials do not deteriorate in water, do not contaminate the water and are compatible with the other piping system materials normally used.

6 Storage Tanks. Almost all storage tanks used for solar applications are pressurized steel tanks. All pressure tanks must have ASME approval. 7 COMPONENT OPERATION 30 Glass Lined The glass or porcelain lined tank is the most widely used. (Figure 2-25) It is available in stock standard sizes from a few gallons to 120 gallons. Larger sizes, up to thousands of gallons, can be constructed on a custom-made basis. In many cases it is more cost-effective to use two or more “standard” tanks rather than one large “custom” one.

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