【Mechanical Equipment Technology Edition】Daily Question 20171221: Common Faults in Refrigeration Systems (2.2)
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This post was last edited by YORK Industrial Refrigeration on 2017-12-25 at 08:25. Starting from now, in order to enhance communication among users, a 【Daily Question】 campaign has been launched on the Mechanical Equipment Technology forum. We hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth points for active participation, 10-15 wealth points for correct answers. This question is valid for two days; no scoring will be given if more than two days pass. If a missed issue is on the low-voltage side, what impact will it have, based on the monitored data? Answer this question from two aspects: air intake and water intake. Answer: If the leak is on the low-pressure side, air will enter the system when the device is turned on, and it will leak out after it is turned off. As a result, with each startup, the suction and discharge pressures will gradually decrease, leading to poor cooling performance and inadequate heat exchange by the heat exchanger. At a certain load, the exhaust pressure will be high. During startup, since the pressure on the low-pressure side is lower than that on the water side, water enters the system, causing ice blockages. This results in low suction pressure, high exhaust temperature, and poor cooling performance. =============================== High-quality promotions: Mechanical equipment——Summary of work in 2017: Summary of work by equipment managers https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1881872 Mechanical equipment——Maintenance procedure for York screw compressors https://bbs.hcbbs.com/thread-1806833-1-1.html Mechanical equipment——Upgrade of York Quinton control centers https://bbs.hcbbs.com/thread-1804837-1-1.html Mechanical equipment——Major maintenance of GEA Grasox screw compressors https://bbs.hcbbs.com/thread-1800467-1-1.html Mechanical equipment——Disassembly and maintenance of British HOWDEN screw compressors https://bbs.hcbbs.com/thread-1832529-1-1.html Mechanical equipment——Disassembly and maintenance of Japanese Maekawa MYCOM screw compressors https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
The leak is on the low-pressure side; if air enters, the relevant pressure and temperature values for monitoring will be slightly higher； The air in the condenser increases the partial pressure within the system, raising the total pressure. Additionally, this air forms a gas layer on the surface of the condenser, creating an additional thermal resistance that reduces heat transfer efficiency, thereby leading to higher condensation pressure and temperature. Air should be released in a timely manner. . If it enters the water: the monitored liquid level will rise, reducing the heat exchange efficiency of the condenser and affecting the lubrication effect.
Answer: If the leak is on the low-pressure side, air will enter the system when the device is turned on, and it will leak out after it is turned off. As a result, with each startup, the suction and discharge pressures will gradually decrease, leading to poor cooling performance and inadequate heat exchange by the heat exchanger. At a certain load, the exhaust pressure will be high. During startup, since the pressure on the low-pressure side is lower than that on the water side, water enters the system, causing ice blockages. This results in low suction pressure, high exhaust temperature, and poor cooling performance. Thank you
If the leak is on the low-pressure side, the evaporation temperature will decrease, and the evaporation pressure will also decrease