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Additional resources for Us Dod - Solar Heating Of Buildings & Domestic Hot Water
The use of aluminum absorbers rather than copper absorbers will also result in substantial savings. 3 Distilled water. Distilled water has been suggested for use in solar collectors since it avoids some of the problems of untreated potable water. First, since the distillation process removes contaminants such as chlorides and heavy metal ions, the problem of galvanic corrosion, though not completely eliminated, should be alleviated. However, distilled water is still subject to freezing and boiling.
NCEL is investigating a dissolved salt storage unit that uses immiscible liquids for the heat exchange surface which greatly reduces the problem of crystallization during recycling. Initial tests have been encouraging.
In general, for equal storage capacity, the rock pebble bed would have to occupy a volume 2-1/2 to 3 times larger than a water tank. Rock storage bins have higher structural requirements, and tend to lose more heat due to their greater surface area. Rock bins generally provide good temperature stratification; contrary to practice in conventional DHW systems, stratification is desirable in both water and air solar systems. NCEL has done studies to show that good stratification can add 5%-10% to overall system performances (Sharp and Loehrke, 1978).