The saturation temperature changes with( )
A. the air density
B. the pressure
C. the present atmospheric pressure
D. surrounding temperature
查看答案
The most infamous greenhouse gas is( )
A. CO2.
B. R134
C. NH.
D. R22
( )is the process of removing heat, and the practical application is to produce or maintaintemperatures below the ambient.
A. Refrigeration
B. Ventilation
Circulation
D. Evaporation
An important consideration in selecting a lubricating oil for use in a refrigeration compressorfor the oil to( )
A. have a high viscosity index
B. mix readily with refrigerant
C. have a high freezing point
D. have a low pour point
Subcooling increases the( )of the refrigeration cycle.
A. capacity
B. refrigeration effect
C. mass flow rate
D. volume flow rate