【Mechanical Equipment Technology Edition】Daily Question 201806019: Refrigeration Systems — Study of Pressure-Humidity Diagrams of Refrigeration Parameters* (9)
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This post was last edited by YORK Industrial Refrigeration on 2018-6-21 at 11:13. This year’s 【Daily Question】is divided into three categories: screw refrigeration compressors, refrigeration systems, and oil circuit systems, 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 receive 10–15 points, with the validity period being two days. ============================== Refrigeration Systems—Pressure-enthalpy diagrams of refrigeration parameters* (9): The diagram below shows the pressure-enthalpy diagram of a refrigeration cycle. Please explain the processes represented by 4–4” and 1’–1 in this refrigeration cycle. The 4-4” stage is characterized by isobaric heat release, cooling, and supercooling ； It should be the subcooling process during condensation in the refrigeration cycle. The characteristic of stage 1’-1 is: isobaric heat absorption, temperature rise, and superheating ； It should be the superheating process during evaporation in the refrigeration cycle. ============================== High-quality promotions: Mechanical equipment——Videos on the repair and calibration 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=
As shown in the theoretical thermodynamic characteristic diagram of the actual refrigeration cycle, the 4-4” section is characterized by isobaric heat release, cooling, and supercooling； It should be the subcooling process during condensation in the refrigeration cycle. The characteristic of stage 1’-1 is: isobaric heat absorption, temperature rise, and superheating ； It should be the superheating process during evaporation in the refrigeration cycle.
4\"-4 The liquid at normal temperature and high pressure, which is discharged from the condenser, becomes a liquid at low temperature and low pressure after passing through the expansion valve (supercooled)； 1”-1 The low-temperature, low-pressure refrigerant gas coming out of the evaporator is superheated
4-4” liquid zone, 1”-1 superheated steam zone
The 4-4” stage is characterized by isobaric heat release, cooling, and supercooling； It should be the subcooling process during condensation in the refrigeration cycle. The characteristic of stage 1’-1 is: isobaric heat absorption, temperature rise, and superheating ； It should be the superheating process during evaporation in the refrigeration cycle.
4\"-4 The liquid at normal temperature and high pressure, which is discharged from the condenser, becomes a liquid at low temperature and low pressure after passing through the expansion valve (supercooled)； 1”-1 The low-temperature, low-pressure refrigerant gas coming out of the evaporator is superheated
4-4\" indicates the subcooling and pressure drop process of the refrigerant liquid； 1”—1 represents the superheating and pressure drop process of the refrigerant.