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10
ANTIFREEZE-PROTECTED SOLAR COMBISYSTEMS
ANSWERS TO TEXTBOOK QUESTIONS AND EXERCISES
1. Propylene glycol is a nontoxic chemical used in food, pharmaceutical, and personal care
2. The freeze point temperature of an antifreeze solution is the point at which ice crystals
maintained in an operating solar combisystem.
3. An inhibitor extends the usable life of the fluid by reducing its tendency to become acidic
7. The solutions become more acidic.
10. Nocturnal cooling offers over-temperature protection by using the collector array as a
12. 47,040 Btu/hr
16. Domestic hot water plus systems are designed to provide a significant percentage of the
18. The f in f-Chart stands for fraction. An annual f-value of 0.458 for a solar domestic water
20. (a) Since this area of the tank is at a higher temperature, more heat is transferred there.
(b) The lower portion of the tank will receive energy from the solar collectors so it is
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set minimum temperature. The highly zoned distribution system receives water from the
tank, with temperature regulation provided by mixing valve MV1.
21. The system in Figure 10-29 uses a diverter valve to direct flow returning from the space
heating distribution system either to the boiler or the midpoint of the thermal storage
24. Such devices could allow air to enter the piping and break the siphon.
