Extremum seeking control for efficient operation of an air-source heat pump water heater with internal heat exchanger cycle vapor injection

2019 ◽  
Vol 99 ◽  
pp. 153-165 ◽  
Author(s):  
Wenyi Wang ◽  
Yaoyu Li ◽  
Feng Cao
Keyword(s):  
Heat Exchanger ◽  
Internal Heat ◽  
Extremum Seeking ◽  
Water Heater ◽  
Efficient Operation ◽  
Extremum Seeking Control ◽  
Air Source Heat Pump ◽  
Internal Heat Exchanger ◽  
Heat Pump Water Heater ◽  
Vapor Injection

scholarly journals Numerical study on the influence of internal heat exchanger in transcritical CO2 heat pumps under optimal pressure conditions

2021 ◽  
Vol 2116 (1) ◽  
pp. 012098
Author(s):  
F Illán-Gómez ◽  
J R García-Cascales ◽  
F J Sánchez-Velasco ◽  
V Sena-Cuevas ◽  
R Otón-Martínez
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Strong Influence ◽  
Numerical Study ◽  
Internal Heat ◽  
Heat Pumps ◽  
Operating Conditions ◽  
Water Heater ◽  
Internal Heat Exchanger ◽  
Heat Pump Water Heater

Abstract This paper presents a numerical study on the influence of internal heat exchanger (IHX) exchanging surface in the performance of a transcritical CO2 heat pump water heater at different operating conditions. Five different IHX geometries and four different evaporation temperatures have been studied with water temperature ranging from 10 °C to 60 °C at the gas cooler inlet. The results show a strong influence of IHX characteristics on system’s performance.

scholarly journals Experimental study on vapor injection air source heat pump with internal heat exchanger for electric bus

2019 ◽  
Vol 158 ◽  
pp. 4147-4153 ◽  
Author(s):  
Xinxin Han ◽  
Huiming Zou ◽  
Hongbo Xu ◽  
Changqing Tian ◽  
Wei Kang
Keyword(s):  
Experimental Study ◽  
Heat Exchanger ◽  
Heat Pump ◽  
Internal Heat ◽  
Air Source Heat Pump ◽  
Internal Heat Exchanger ◽  
Electric Bus ◽  
Vapor Injection

scholarly journals The Influence of Internal Heat Exchanger on the Performance of Transcritical CO2 Water Source Heat Pump Water Heater

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1787
Author(s):  
Fan Feng ◽  
Ze Zhang ◽  
Xiufang Liu ◽  
Changhai Liu ◽  
Yu Hou
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Internal Heat ◽  
Water Source ◽  
Hot Water ◽  
Operational Performance ◽  
Water Heater ◽  
Source Temperature ◽  
Internal Heat Exchanger ◽  
Heat Pump Water Heater

The characteristics of the transcritical CO2 heat pump water heater (HPWH) system are; a lower inlet hot water temperature (Ti-hw) (sometimes this is lower than the water source temperature), and an outlet gas cooler temperature (To-gc) which is affected by the Ti-hw and often lower than the critical temperature. In order to study the effects of the internal heat exchanger (IHX) on the operational performance of the transcritical CO2 HPWH when To-gc is low, a transcritical CO2 water source HPWH experiment platform is established to conduct experimental research and comparative analysis on the operational performance of the transcritical CO2 water source HPWH, with or without IHX. It is found that, if only the coefficient of performance (COP) and heating at the optimal exhaust pressure of the transcritical CO2 water source HPWH were considered, COP and the heating of the non-IHX system would be slightly higher than those of the IHX system at the lower hot water flow and water source temperature, and this increase was not obvious. At the higher hot water flow rate and water source temperature, COP and the heating of the non-IHX system were also higher than those of the IHX system, and the increase was obvious. The experiment results showed that, near the optimal exhaust pressure, the variation range of COP and heating of the IHX system is relatively small, and the system has a relatively high stability.

scholarly journals Energy, Exergy, and Environmental (3E) Analysis of Hydrocarbons as Low GWP Alternatives to R134a in Vapor Compression Refrigeration Configurations

2021 ◽  
Vol 11 (13) ◽  
pp. 6226
Author(s):  
Morteza Ghanbarpour ◽  
Adrián Mota-Babiloni ◽  
Bassam E. Badran ◽  
Rahmatollah Khodabandeh
Keyword(s):  
Heat Exchanger ◽  
Environmental Impact ◽  
Impact Analysis ◽  
Internal Heat ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Two Stage ◽  
Internal Heat Exchanger ◽  
Vapor Injection ◽  
Flash Tank

The phase-down of hydrofluorocarbons and substitution with low global warming potential values are consequences of the awareness about the environmental impacts of greenhouse gases. This theoretical study evaluated the energy and exergy performances and the environmental impact of three vapor compression system configurations operating with the hydrocarbons R290, R600a, and R1270 as alternatives to R134a. The refrigeration cycle configurations investigated in this study include a single-stage cycle, a cycle equipped with an internal heat exchanger, and a two-stage cycle with vapor injection. According to the results, the alternative hydrocarbon refrigerants could provide comparable system performance to R134a. The analysis results also revealed that using an internal heat exchanger or a flash tank vapor injection could improve the system’s efficiency while decreasing the heating capacity. The most efficient configuration was the two-stage refrigeration cycle with vapor injection, as revealed by the exergy analysis. The environmental impact analysis indicated that the utilization of environmentally-friendly refrigerants and improving the refrigeration system’s efficiency could mitigate equivalent CO2 emissions significantly. The utilization of hydrocarbons reduced the carbon footprint by 50%, while a 1% to 8% reduction could be achieved using the internal heat exchanger and flash tank vapor injection.

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