【Mechanical Equipment Technology Edition】Daily Question 201806021: Refrigeration Systems — Study of Pressure-Humidity Diagrams of Refrigeration Parameters* (11)
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This post was last edited by YORK Industrial Refrigeration on 2018-6-23 at 09:34. 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-Humidity Diagrams of Refrigeration Parameters* (11): The diagram below shows the pressure-humidity diagram of a refrigeration cycle. What state of the refrigeration cycle does point 1” represent? Point 1” represents the saturated suction point before overheating occurs. https://attach01.hcbbs.com/forum/201806/19/100058g8o80j8sz0p8j9z8.jpg.thumb.jpg ============================== High-quality promotions: Video tutorials on the maintenance and adjustment of York compressors for industrial equipment https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1806833 Procedures for maintaining York screw compressors for industrial equipment https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1806833 Upgrading the control systems of York Quontum compressors for industrial equipment https://bbs.hcbbs.com/thread-1804837-1-1.html Overhaul of GEA Grasso screw compressors for industrial equipment https://bbs.hcbbs.com/thread-1800467-1-1.html Disassembly and maintenance of HOWDEN screw compressors from the UK for industrial equipment https://bbs.hcbbs.com/thread-1832529-1-1.html Disassembly and maintenance of MYCOM screw compressors from Japan for industrial equipment https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=
Point 1” represents the intersection of the isobaric line corresponding to the refrigeration cycle state P0 and the dry saturated vapor line
Indicates the superheat (beneficial or harmful) of the refrigerant vapor and the pressure drop process；
Point 1\" represents the intersection of the isobaric line corresponding to the refrigeration cycle state P0 and the dry saturated vapor line.
Point 1’: From the pressure-enthalpy diagram, this is the intersection point of the P0 isobar with the dry saturated steam line； What corresponds to the actual refrigeration process is the dry, saturated but yet unsuperheated gaseous refrigerant after vaporization is complete. Position analysis in the corresponding process: Overheating during suction occurs in two scenarios. In one scenario, the saturated vapor of the refrigerant leaves the evaporator (such as a shell-and-tube evaporator) and then overheats in the suction pipe; in this case, point 1” is located between the evaporator and the suction pipe. 2. In another scenario, if the refrigerant vapor is superheated inside the evaporator (such as a coiled-tube evaporator fed by a thermal expansion valve), then point 1” is located within the evaporator.
Point 1\" represents the intersection of the isobaric line corresponding to the refrigeration cycle state P0 and the dry saturated vapor line.