Describe an air-to-air heat pump.
What will be an ideal response?
The most frequently used heat pump is an air- to-air unit. It has a compressor similar to those used in refrigerators. A refrigerant (a gas) circulates in coils. In heating mode, the coils in the exterior unit enable the refrigerant to absorb heat from outdoor air. The refrigerant is then transferred to a compressor where compression raises its temperature. It then transfers to indoor coils, a blower moves air over it, which captures the heat and distributes it through a building via ducts. In cooling mode, the reverse happens. Heat is absorbed by the inside coils and dispersed to outside air by the outside coils.
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If the strength of the weld is to be given rather than its size, the value is placed to the ____ of the spot-weld symbol.
A. right B. left C. top D. bottom
For systems that operate on ____________________ parity, the parity bit is used to make the total of 1s add up to an odd number.
Fill in the blank(s) with the appropriate word(s).
The use of high-frequency sound waves to measure fat thickness and loin-eye area is called
____________________.
Fill in the blank(s) with the appropriate word(s).A cement that is used when concrete forms must be removed as soon as possible is Type _____
a. IA b. II c. III d. IV