Theoretical study of a high-temperature heat pump system composed of a CO 2 transcritical heat pump cycle and a R152a subcritical heat pump cycle

2017 ◽  
Vol 120 ◽  
pp. 228-238 ◽  
Author(s):  
Wei-wei Yang ◽  
Xing-qi Cao ◽  
Ya-ling He ◽  
Fei-yu Yan
Keyword(s):  
High Temperature ◽  
Heat Pump ◽  
Theoretical Study ◽  
Pump System ◽  
Heat Pump System ◽  
Temperature Heat ◽  
High Temperature Heat Pump

scholarly journals Intelligent High-performance Dynamic Control for Two-stage Screw High-temperature Heat Pump System

2018 ◽  
Vol 30 (11) ◽  
pp. 2599 ◽  
Author(s):  
Win-Jet Luo ◽  
Jin-Chang Lai ◽  
Po-Yuan Hsieh ◽  
Fikri Rahmat Fasya
Keyword(s):  
High Temperature ◽  
Heat Pump ◽  
High Performance ◽  
Dynamic Control ◽  
Two Stage ◽  
Pump System ◽  
Heat Pump System ◽  
Temperature Heat ◽  
High Temperature Heat Pump

Dual-pressure condensation high temperature heat pump system for waste heat recovery: Energetic and exergetic assessment

2020 ◽  
Vol 218 ◽  
pp. 112997 ◽  
Author(s):  
Baomin Dai ◽  
Xiao Liu ◽  
Shengchun Liu ◽  
Yingying Zhang ◽  
Dan Zhong ◽  
...  
Keyword(s):  
High Temperature ◽  
Heat Pump ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Pump System ◽  
Heat Pump System ◽  
Temperature Heat ◽  
High Temperature Heat Pump

scholarly journals Thermodynamic comparision of R744/R600a and R744/R600 used in mid-high temperature heat pump system

2014 ◽  
Vol 18 (5) ◽  
pp. 1655-1659
Author(s):  
Xiao-Wei Fan ◽  
Fu-Jun Ju ◽  
Xian-Ping Zhang ◽  
Fang Wang
Keyword(s):  
High Temperature ◽  
Heat Pump ◽  
Waste Heat ◽  
Operating Conditions ◽  
Hot Water ◽  
Pump System ◽  
Volumetric Heating ◽  
Heat Pump System ◽  
Temperature Heat ◽  
High Temperature Heat Pump

The mid-high temperature heat pump provides hot water at a relatively high temperature using some industrial waste heat as its source. Now, the main refrigerants in this application are CFC114, HCFC123, and HCFC142b, etc., which are scheduled to be phased out due to their high ozone depletion potential and global warmth potential. Some studies have been conducted to find an eco-friendly alternative. In this paper, the natural non-azeotropic mixtures R744/R600a and R744/R600 are analyzed as alternatives. The performance of the heat pump system using new mixture is discussed and compared with those with CFC114, HCFC123, and HCFC142b. Under the given operating conditions, the maximum heating COP should occur at the mass fractions of 18/82 for R744/R600a and 10/90 for R744/R600. Both of their COP are higher than those with the refrigerants of CFC114, HCFC123, and HCFC142b. The COP and volumetric heating capacity of the system with R744/R600a are superior to those with R744/R600.

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