【Mechanical Equipment Technology Edition】Daily Question 201806024: Refrigeration Systems — Study of Pressure-Humidity Diagrams of Refrigeration Parameters* (13)
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This post was last edited by YORK Industrial Refrigeration on 2018-7-3 at 09:01. This year’s 【Daily Question】 is divided into three categories: screw refrigeration compressors, refrigeration systems, and oil circuits, aiming to provide a comprehensive understanding of refrigeration technology. (If you encounter something you don’t know or can’t answer, please actively look up information; as you do so, your skills will improve!) ) All participants in the comments on this post will receive 1-3 wealth points; those who give complete answers will get 10-15 points, with the validity period being two days. ============================== Refrigeration Systems — Pressure-enthalpy diagrams of refrigeration parameters* (13): Given: Point 1” is the saturated suction point before superheating ； Point 1 represents the suction temperature after superheating; therefore, the suction superheat can be calculated as suction temperature minus the saturation temperature at that point, which can be determined using a pressure-enthalpy diagram. In other words, suction superheat = temperature at Point 1 – temperature at Point 1”. Similarly, what is the subcooling value? Supercooling degree = 4—4” https://attach01.hcbbs.com/forum/201806/19/100058g8o80j8sz0p8j9z8.jpg.thumb.jpg ============================== High-quality promotions: Mechanical equipment——Videos on the repair and adjustment of York compressors https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1806833 Mechanical equipment——Maintenance procedures for York screw compressors https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1806833 Mechanical equipment——Upgrading of York Quinton control centers https://bbs.hcbbs.com/thread-1804837-1-1.html Mechanical equipment——Major repairs 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=
Supercooling = Temperature at point 4 – Temperature at point 4’
Supercooling = Temperature at point 4 – Temperature at point 4”
The temperature of a refrigerant liquid that is lower than that of the saturated liquid at the same pressure is called subcooling, and the difference between these temperatures is known as the degree of subcooling.
According to the pressure-enthalpy diagram, the 4–4” section represents the subcooled liquid refrigerant stage; therefore, the degree of subcooling = temperature at point 4 – temperature at point 4”
Temperature at point 4 – Temperature of -4”
According to the pressure-enthalpy diagram, the 4–4” section represents the subcooled liquid refrigerant stage, with the subcooling degree equal to the temperature at point 4 minus the temperature at point 4”.
Supercooling = Temperature at point 4 – Temperature at point 4”
Point 4 is the saturated point of the liquid refrigerant before superheating ； Point 4” represents the saturated liquid point after supercooling