The balance point of an air-source heat pump is the temperature at which:
A) The heat pump cooling capacity matches the heat pump heating capacity.
B) The heat pump heating capacity just matches the building heat loss.
C) The cost of operating the heat pump is the same as the cost of operating a fossil fuel furnace.
D) The system low-side and high-side pressures are the same.
B
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Coping should be laid in mortar as other masonry is laid.
Answer the following statement true (T) or false (F)
The ____ has greatly increased in popularity for use in the air conditioning field over the past years.
a. dual-voltage motor b. permanent-split capacitor motor c. resistance-start induction-run motor d. capacitor-start capacitor-run motor
Which of the following is true of a WPS?
A. It need not list every parameter. B. Critical parameters should be more closely defined or limited. C. It is not normally written in compliance with a specific code. D. It provides a general guideline, but does not list detailed information.
In the circuit shown in Figure P9.50, R must maintain the Zener diode within its specified limits. If
Vbatt = 15 ± 3 V, Ro = 1,000 ?, Vz = 5V,4 mA ? Iz ? 18 mA,
determine the minimum and maximum values of R that can be used.
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