Question 77Refrigeration/AC - QMED70% to pass
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by which of the following?
AI Explanation
The correct answer is D) air and non-condensable gases in the condenser.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, is typically caused by the presence of air and non-condensable gases in the condenser. These gases reduce the condenser's ability to effectively condense the refrigerant, leading to a rise in the system's head pressure.
The other answer choices are incorrect because: A) water in the refrigerant would not cause a rise in head pressure without a change in cooling water temperature, B) a restriction in the liquid line would affect the low-pressure side, not the high-pressure side, and C) flooding back of liquid refrigerant would actually decrease the head pressure.
Related Questions
#75 Which of the following conditions would indicate that the liquid line strainer in a refrigeration system has become excessively restricted and requires cleaning or replacement? #76 During tests to discover why a refrigeration compressor is running continuously, it is determined that the refrigerated space temperature is slightly above normal without ever reaching the desired minimum temperature. Suction and discharge pressures are normal for the corresponding box temperature. In this situation, what should you suspect? #78 If the compressor is heard to knock while pumping down the low side for repairs, but otherwise the compressor sounds normal; this is a possible indication of what condition? #79 If a refrigeration system compressor crankcase is exhibiting an unusual degree of sweating or frosting and is operating noisily, what should be done? #80 If increasing the cooling water flow to a refrigeration condenser fails to lower the condenser pressure, the probable cause may be due to what condition?