Effect of vapor-injection technique on the performance of a cascade heat pump water heater

2014 ◽  
Vol 38 ◽  
pp. 168-177 ◽  
Author(s):  
Chul Woo Roh ◽  
Min Soo Kim
Keyword(s):  
Heat Pump ◽  
Injection Technique ◽  
Water Heater ◽  
Heat Pump Water Heater ◽  
Vapor Injection

Theoretical investigation on the heating performance of a recuperative heat pump water heater using CO2/HCs with large temperature glides in cold regions

2021 ◽  
pp. 1-22
Author(s):  
Jielin Luo ◽  
Qin Wang ◽  
Zhen Zhao ◽  
Kaiyin Yang ◽  
Guangming Chen ◽  
...  
Keyword(s):  
Heat Pump ◽  
Temperature Difference ◽  
Hot Water ◽  
Large Temperature ◽  
Water Heater ◽  
Ambient Temperatures ◽  
Heating Performance ◽  
Heat Pump Water Heater ◽  
Vapor Injection ◽  
Injection Cycle

Abstract Considering the issues of environmental pollution and energy efficiency, heat pumps are gradually replacing traditional coal combustion for heating at low ambient temperatures. In this paper, eco-friendly CO2/HCs with large temperature glides are applied in a single-stage recuperative heat pump water heater. Its heating performance is theoretically investigated under the working condition of producing circulating hot water in typical winter of northern China, with medium temperature difference between supply/return water and large temperature difference between air inlet and water inlet. Due to its simple structure, low initial investment and high efficiency, its potential for producing circulating hot water is demonstrated. Exergy analyses are conducted to reveal the significant influence of the exergy losses of heat exchanger on system performance. For specified CO2/HC, optimal COP is obtained through global optimization of cycle pressures and mixture concentration. The heating performances of different CO2/HCs are compared, among which CO2/R600 and CO2/R600a behave better. Meanwhile, a typical vapor-injection cycle is used to demonstrate priorities on the heating performance of this recuperative cycle, in which the COP of recuperative cycle using CO2/R600 is more than 3.4% higher than that of the vapor-injection cycle. The results obtained in this paper provide a simple and efficient solution for producing circulating hot water at low ambient temperatures.

Investigation of the heat pump water heater using economizer vapor injection system and mixture of R22/R600a

2009 ◽  
Vol 32 (3) ◽  
pp. 509-514 ◽  
Author(s):  
Cao Feng ◽  
Wang Kai ◽  
Wang Shouguo ◽  
Xing Ziwen ◽  
Shu Pengcheng
Keyword(s):  
Heat Pump ◽  
Injection System ◽  
Water Heater ◽  
Heat Pump Water Heater ◽  
Vapor Injection

Research and development of an air-cycle heat-pump water heater. Final report

1979 ◽  
Author(s):  
J.T. Dieckmann ◽  
A.J. Erickson ◽  
A.C. Harvey ◽  
W.M. Toscano
Keyword(s):  
Research And Development ◽  
Heat Pump ◽  
Final Report ◽  
Water Heater ◽  
Heat Pump Water Heater

Numerical analysis of the heat pump water heater with immersed helically coiled tubes

2021 ◽  
Vol 39 ◽  
pp. 102547
Author(s):  
Sami Missaoui ◽  
Zied Driss ◽  
Romdhane Ben Slama ◽  
Bechir Chaouachi
Keyword(s):  
Numerical Analysis ◽  
Heat Pump ◽  
Water Heater ◽  
Heat Pump Water Heater
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