Why should sharp objects not be used to chip away ice from an evaporator?
What will be an ideal response?
The evaporator could easily puncture and the entire refrigerant charge would be lost.
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In a window that carries the performance label "HS-C30 71 × 59," the number 30 indicates that the window
A) will leak a maximum of 30% of the room's air per hour. B) should not be subjected to a maximum wind load of 30 psf. C) should not be subjected to a maximum combined wind load and vapor pressure of 30 psf. D) conforms to the applicable standard up to a size of 30 in. × 30 in. E) none of the above.
Which of the following is a material used to make insulation?
A. Calsil B. Wrap C. Refractories D. All of the above
An example of a fail-safe design that is fail-passive is a ____________.
Fill in the blank(s) with the appropriate word(s).
Cooling towers are designed to reduce the entering water temperature to within ____°F of the air's wet-bulb temperature.
A. 3 B. 7 C. 14 D. 35