Describe the relationship between IR frequencies and the visual portion of the electromagnetic spectrum.
What will be an ideal response?
Infrared radiation is a region of the electromagnetic spectrum which is located below the frequency of visible red light.
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Closed-loop, or ____________________, systems reuse the same heat transfer fluid, which is circulated in buried plastic pipes within the earth or within a lake or pond.
Fill in the blank(s) with the appropriate word(s).
Match the part of the circle and its description.
A. center B. radius C. diameter D. arc E. chord F. circumference G. included angle
A solution used as a secondary refrigerant in chillers consisting of water and a chemical which lowers the water's freezing point is called:
A) Brine. B) Propylene glycol. C) Hydraulic fluid. D) Slush.
An air conditioning system should be pumped down (evacuated) for a minimum of ____ minutes.
A. 10 B. 20 C. 30 D. 60