题目内容

The cooling coil also performs the dehumidification function. If the coil temperature is below the air( ), water vapor will condense and air humidity will be lowered.

A. triple point
B. boiling point
C. solidifying point
D. dew point

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In order to maintain the desired( )in the conditioned spaces, the HVAC system must addor remove thermal energy to or from the space.

A. temperature
B. humidity
C. temperature or humidity
D. temperature and humidity

The purpose of the( ). in the vapor compression cycle is to accept the low-pressure dry afrom the evaporator and raise its pressure to that of the condenser.

A. condenser
B. compressor
C. evaporator
D. expansion valve

The purpose of the expansion valve is to control the flow of refrigerant from the high-pressescondensing side of the system into the low-pressure( )

A. condenser
B. expansion valve
C. evaporator
D. compressor

When cooling is by direct expansion, a separate( )is fitted in the unit for winter heating.

A. central heater
B. electrical heater
C. hot water coil
D. steam heater coil

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