Why are thermostatic expansion valves often used as the outdoor metering device for the heating cycle?
A) TEVs can be adjusted in the field to match the heat pump's performance with the climate it will be operating in.
B) TEVs are easier to install on the outdoor coil.
C) TEVs allow the system pressures to equalize in the off cycle, allowing the use of low starting torque compressors.
D) The TEV can modulate the refrigerant flow over the wide range of temperatures experienced in the heating mode.
D
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Fill is placed and compacted in multiple layers called _____.
a. strata b. flights c. panels d. lifts
Mark had 620 acres of corn that yielded 152 bushels per acre. His total operating expenses for the combines were $34.50 per acre.
a. What was the total operating expense of the combines? b. What was the expense per bushel to the nearest tenth of a cent?
Explain why the top half of a split-wired receptacle is “hot” all the time and the switch-controlled half is on the bottom.
What will be an ideal response?
The delivered equipment cost for setting up a production and assembly line for high-sensitivity, gas-damped accelerometers is $650,000. If the direct cost and indirect cost factors are 1.36 and 0.31, respectively, and both factors apply to delivered equipment cost, the total plant cost estimate is approximately: (choose one)
(a) $2,034,500 (b) $1,815,500 (c) $1,735,500 (d) $1,183,000