单项选择题
To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, you should （）
A.admit only enough fresh outside air to provide proper ventilation
B.reduce the air reheating system load
C.lower the compressor head pressure
D.operate the purge recovery unit continuously
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相关考题
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单项选择题
To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）
A.suction service valve as a vapor
B.suction service valve as a liquid
C.discharge service valve as a vapor
D.charging valve as a liquid -
单项选择题
Which of the fluids listed is normally used to condense the primary refrigerant in a shipboard central air conditioning system?（）
A.Air or Nitrogen
B.Seawater or Fresh water
C.Sodium Nitrate brine
D.Calcium Sulfate brine -
单项选择题
The effective temperature of air is dependent upon（） Ⅰ.relative humidity Ⅱ.air velocity
A.Ⅰonly
B.Ⅱonly
C.Both Ⅰand Ⅱ
D.NeitherⅠnor Ⅱ
