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Figure 7-32 Figure 7-33a use of sheet insulation products, carefully fitted to irregular shapes and applied with compatible adhesives. The volute of a circulator is one of the more difficult components to insulate. Some circulator manufacturers offer preformed insulation shells for specific models of circulators. One example of such a shell is shown in Figure 7-31. To be effective, these insulation shells must be fit tightly to the circulator volute and be sealed at all edges and seams to prevent air entry. It’s also important to insulate isolation flanges or valves. Carefully cut and fit elastomeric foam insulation is one possibility. Self- adhering elastomeric foam tap is another. The motor on a circulator should never be insulated because it inhibits heat dissipation, especially if the same circulator operates during heating mode. These insulation and vapor sealing techniques also apply to devices that combine electrical components with fluid conveying components. Examples include zone valves, diverter valves and mixing valves. Figure 7-32 shows adequately insulated zone valves. Notice that the valve bodies are insulated, but the electrical actuators are not. It is also important to support insulated piping that conveys chilled water so that the insulation does not undergo significant compression due to the forces transferred between the piping and its supports. Figure 7-33 shows one type of polymer tube support designed so that insulation can be nearly continuous along the copper tubing. Figure 7-33b The polymer tube support hangs from a piece of channel strut and closes around the copper tube. Elastomeric foam insulation slides into the support from both directions. A final detail is to caulk the perimeter seam where the insulation and tube support meet, which is not shown in Figure 7-33b. idronics #13 provides a more extensive discussion of chilled water cooling. Courtesy of Andy Jones 72PDF Image | Heat Pump Systems 2020
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