Which of the following is not a good way to provide freeze protection for a flat-plate collector system?

Renewable Sources of Energy Mcqs
BILAL KHATTAK0

A.Use of movable insulation to cover the collector
B.Drain the collector when it is not operating during periods of low ambient temperatures
C.Circulate an antifreeze solution rather than water
D.Increase the rate of water flow through the collector by a factor of 2 leaving it on at all times

Related Mcqs:

  1. Which of the following is not a good way to improve the performance of a flat-plate solar collector?
  2. Compare the heat loss between the absorber plate of flat-plate collector and the cover with that between the cover and the ambient air at steady state.
  3. Which of the following passes through a maximum with increase in the number of covers (glazings) used in a flat-plate solar collector?
  4. Which of the following is usually not used as the heat exchange fluid in a flat-plate solar collector?
  5. The efficiency of a flat-plate solar collector using water as a heat-exchange fluid is largest at which of the following temperature for the absorber plate? Assume Ta = 25?C.
  6. If the wind is blowing with a 10 kilometer per hour the dominant heat loss mechanism(s) between the top cover plate of flat-plate solar collector and the ambient air is / are
  7. What is the serious problem with using a thin plastic sheet as the glazing material in a flat-plate solar collector?
  8. A severe disadvantage of using a mixture of ethylene glycol and water as the heat-exchange fluid for a flat-plate collector is that
  9. The radiative heat loss between the top cover of flat-plate solar collector at a temperature of Tp(K) and ambient air at a temperature of Ta(K) is proportional to
  10. The equal percentage characteristic of a valve is

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