Experimental Investigation of Heat Pump Water Heater Using CO<sub>2</sub> Zeotropic Mixture with Large Temperature Glide for Waste Heat Recovery

Zhang Tao; Wu Jiafeng; Liu Jian; Zhang Xiaosong; Li Mingxia

doi:10.3969/j.issn.0253-4339.2024.04.021

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Experimental Investigation of Heat Pump Water Heater Using CO₂ Zeotropic Mixture with Large Temperature Glide for Waste Heat Recovery

Refrigerant Substitution Technology | 更新时间：2024-09-02

- Experimental Investigation of Heat Pump Water Heater Using CO₂ Zeotropic Mixture with Large Temperature Glide for Waste Heat Recovery
- Journal of Refrigeration Vol. 45, Issue 4, Pages: 21-27(2024)
- 作者机构：
  
  东南大学能源与环境学院　南京　 211189
- 作者简介：
  
  Liu Jian, male, associate professor, School of Energy and Environment, Southeast University, 86-15105177032, E-mail:liujian8@seu.edu.cn. Research fields: refrigerant substitute technology, heat pump.
- 基金信息：
  
  the National Natural Science Foundation of China(51976033)
- DOI：10.3969/j.issn.0253-4339.2024.04.021
  CLC： TB61⁺2;TB64;TB657.5
- Received：29 March 2024，
  
  Revised：13 May 2024，
  
  Accepted：15 May 2024，
  
  Published：16 August 2024
- 稿件说明：
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Zhang Tao, Wu Jiafeng, Liu Jian, et al. Experimental Investigation of Heat Pump Water Heater Using CO₂ Zeotropic Mixture with Large Temperature Glide for Waste Heat Recovery[J]. Journal of refrigeration, 2024, 45(4): 21-27.
DOI：

Zhang Tao, Wu Jiafeng, Liu Jian, et al. Experimental Investigation of Heat Pump Water Heater Using CO₂ Zeotropic Mixture with Large Temperature Glide for Waste Heat Recovery[J]. Journal of refrigeration, 2024, 45(4): 21-27. DOI： 10.3969/j.issn.0253-4339.2024.04.021.

摘要

通过热泵技术将生产/生活中的低品位余热提质增效具有广泛的应用潜力。其中，非共沸工质能够实现热泵循环换热过程中的温度匹配，实现余热资源的深度利用。基于水源热泵热水实验台对基于大滑移温度的CO

/R1234yf、CO

/R290、CO

/R600a和CO

/R32非共沸工质进行实验分析，并以R290工质作为对照，研究蒸发器与冷凝器同时满足大温差情况下的热泵性能表现。结果表明：非共沸工质充注量主要影响循环过冷度，进而影响系统COP，当CO

/R1234yf 的质量分数为15%/85%时，循环存在最优充注量，在实验工况（热源进水温度25 ℃，出水温度5 ℃；热汇进水温度15 ℃，出水温度45 ℃）下最优充注量对应的COP为 7.66。同时，在实验工况下，相较于R290单工质，CO

/R290工质对最优COP提升了75.2%，对应

（单位容积制热量）提升了107.7%；CO

/R1234yf工质对最优COP提升了27.7%，对应

提升了92.0%；CO

/R32工质对最优COP提升了15.0%；而CO

/R600a工质对最优COP仅提升1.7%，应用潜力较低。

Abstract

Heat pump technology can be used to upgrade and enhance the quality of low-grade waste heat in production and daily life. Zeotropic mixtures can achieve temperature matching during the heat exchange process of heat pump cycles

which realizes in-depth utilization of waste heat resources. This study conducts an experimental analysis of CO

/R1234yf

/R290

/R600a

and CO

/R32 zeotropic mixtures using a water-source heat pump experimental system. The performances of heat pumps with evaporators and condensers that simultaneously satisfy high-temperature differences were investigated using the zeotropic mixture. Results show that the amount of charge in the zeotropic mixture primarily affects the degree of cycle subc

ooling

thereby influencing the coefficient of performance (COP) of the system. When the mass composition of CO

/R1234yf is 15%/85%

an optimal refrigerant charge

which corresponds to a COP of 7.66 under the experimental condition (heat source inlet water temperature at 25 ℃

outlet at 5 ℃; heat sink inlet water temperature at 15 ℃

outlet at 45 ℃) is obtained. Furthermore

compared with pure R290

the CO

/R290 working pair exhibits an enhancement of 75.2% in the optimal COP

with a corresponding increase of 107.7% in the volumetric heating capacity (

). Similarly

the CO

/R1234yf working pair demonstrates an improvement of 27.7% in the optimal COP and an increase of 92.0% in

. The CO

/R32 working pair exhibits a 15.0% increase in the optimal COP. However

the CO

/R600a working pair exhibited only a 1.7% enhancement in the optimal COP

indicating a relatively low application potential.

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Experimental Investigation of Heat Pump Water Heater Using CO2 Zeotropic Mixture with Large Temperature Glide for Waste Heat Recovery

DOI：10.3969/j.issn.0253-4339.2024.04.021

摘要

Abstract

关键词

Keywords

references

Experimental Investigation of Heat Pump Water Heater Using CO₂ Zeotropic Mixture with Large Temperature Glide for Waste Heat Recovery