Type III — Low-Pressure第 174 / 240 题
Non-condensable gases such as air that collect in a low-pressure chiller will:
a.Lower head pressure and save energy
b.Raise head pressure and reduce efficiency
c.Have no effect on operation
d.Increase the refrigerant charge
解析
Non-condensable gases collect at the high point of the condenser and raise head pressure, which forces the compressor to work harder and cuts cooling efficiency. That is why the purge unit exists. Rising non-condensables also point to an air leak on the vacuum side that should be repaired.
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同考点相关题目
- Which gas is safe to use, along with a trace of refrigerant, to raise pressure in a low-pressure appliance for leak detection?
- The 25 mm Hg absolute recovery requirement for low-pressure appliances applies to:
- Approximately what inches-of-mercury vacuum reading corresponds to the 25 mm Hg absolute recovery level for low-pressure appliances?
- Compared with older designs, a high-efficiency purge unit is desirable because it:
- A technician wants to warm the refrigerant in a low-pressure chiller to speed recovery. Which method is acceptable?
- Low-pressure chillers most commonly use which type of compressor?