【Mechanical Equipment Technology Edition】Daily Question 20171225: Common Faults in Refrigeration Systems (2.3)
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This post was last edited by YORK Industrial Refrigeration on 2017-12-27 at 08:23. Starting from now, in order to enhance communication among users, a \"Question of the Day\" 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 missing issue is found on the high-voltage side, what impact will it have, based on the monitored data? Please analyze it. The leak is on the high-pressure side; the pressure on the refrigerant side is higher than the external pressure, causing the refrigerant to leak. As a result, there will be a high exhaust temperature, a high oil temperature, poor cooling performance, and an insufficient liquid level in the heat exchanger. And the intake and exhaust pressures will gradually decrease. =============================== High-quality promotions: Moving equipment——Summary of work in 2017: Summary of the work done by equipment managers https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1881872 Moving equipment——Maintenance process for York screw compressors https://bbs.hcbbs.com/thread-1806833-1-1.html Moving equipment——Upgrade of York Quontum control centers https://bbs.hcbbs.com/thread-1804837-1-1.html Moving equipment——Major maintenance of GEA Grasox screw compressors https://bbs.hcbbs.com/thread-1800467-1-1.html Moving equipment——Disassembly and maintenance of British HOWDEN screw compressors https://bbs.hcbbs.com/thread-1832529-1-1.html Moving equipment——Disassembly and maintenance of Japanese Maekawa MYCOM screw compressors https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
If the leak is on the high-pressure side, it will cause a leakage of refrigerant, resulting in a reduced cooling effect. The detected temperature will gradually increase, while the liquid level in the condenser and the oil level in the compressor’s oil sight glass will drop, causing the compressor to operate with insufficient oil. Will air enter after shutting down the system to reduce pressure, causing the same symptoms of leakage on the low-pressure side? (Not sure, but this possibility cannot be ruled out)
After shutdown, air will not enter. At the low-pressure side, negative pressure is present when it is turned on, which allows air to enter, whereas at the high-pressure side, positive pressure exists both when it is turned on and off. At the high-pressure side, water may enter the condenser, as the pressure on the water side is approximately 3 kilograms; when the pressure in the system is less than 3 kilograms, water will enter the system.
The exhaust temperature gradually rises, the cooling efficiency decreases, and the outlet temperature of the chilled water increases
The exhaust temperature gradually rises, the cooling efficiency decreases, and the outlet temperature of the chilled water increases
When leakage begins, the exhaust pressure drops, and the volume slide valve adjusts to its maximum position. The exhaust pressure is insufficient, resulting in inadequate condensation; the liquid level in the condenser drops, the cooling capacity is insufficient, the energy slide valve is loaded to its maximum capacity, and the motor current increases.