Type III — Low-PressureCâu 192 / 240
In a low-pressure chiller, the evaporator normally operates:
a.At very high positive pressure
b.At exactly atmospheric pressure
c.Above the condenser pressure
d.Below atmospheric pressure, in a vacuum
Giải thích
The evaporator of a low-pressure chiller runs below atmospheric pressure, that is, in a vacuum, because the refrigerant boils at a low temperature under low pressure. This vacuum is why leaks admit air and moisture. Understanding this is central to all Type III procedures.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Which refrigerant is a CFC once widely used in low-pressure chillers and now available only as reclaimed stock?
- A machine room housing a low-pressure chiller should have a refrigerant monitor and ventilation mainly to protect against:
- The main reason a torch must never be used to warm a low-pressure chiller during recovery is that:
- A technician recovering R-123 reaches 25 mm Hg absolute but the reading rises back up after the recovery machine stops. This usually indicates:
- Which of the following is NOT a low-pressure appliance refrigerant?
- Excessive water in a low-pressure chiller can freeze and rupture tubes because low-pressure refrigerants:
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