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Performance investigation of a novel frost-free air-source heat pump water heater combined with energy storage and dehumidification

Author

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  • Wang, Fenghao
  • Wang, Zhihua
  • Zheng, Yuxin
  • Lin, Zhang
  • Hao, Pengfei
  • Huan, Chao
  • Wang, Tian

Abstract

Air-source heat pump (ASHP) often operates with substantial frost formation on the outdoor heat exchanger at low ambient temperature in winter, it insulates the finned surface and also reduces heat transfer rate, leading to performance degradation or even shutdown of ASHP systems. Although several defrosting methods have been reported, the frosting and defrosting processes reduced energy efficiency and resulted in, in some cases, heat pump breakdown. To solve this problem, a novel frost-free air-source heat pump water heater (ASHPWH) system has been developed, which coupled with an extra heat exchanger coated by a solid desiccant (EHECSD) with an energy storage device (ESD). Based on the previous studies, a further analysis and comprehensive research on the novel frost-free ASHPWH system is presented in this paper. The dynamic characteristics of the novel system are investigated experimentally in different ambient conditions. An experimental setup and experimental procedures are described in detail. Thereafter, the dehumidification efficiency and regeneration efficiency of EHECSD, suction and discharge pressures of the compressor, the temperature of PCM are evaluated during the heating and regeneration modes respectively. Results indicate that the system can keep the evaporator frost-free for 32, 34, 36min during heating mode at the ambient temperatures of −3°C, 0°C and 3°C and 85% RH. Compared with the reverse-cycle defrosting (RCD), COP of the frost-free ASHPWH are 17.9% and 3.4% higher at the ambient temperature of −3°C and 3°C respectively. With this innovative technology, it has been proved that the new system can realize continuous heating and excellent performance at a low ambient temperature.

Suggested Citation

  • Wang, Fenghao & Wang, Zhihua & Zheng, Yuxin & Lin, Zhang & Hao, Pengfei & Huan, Chao & Wang, Tian, 2015. "Performance investigation of a novel frost-free air-source heat pump water heater combined with energy storage and dehumidification," Applied Energy, Elsevier, vol. 139(C), pages 212-219.
    • Handle: RePEc:eee:appene:v:139:y:2015:i:c:p:212-219
    DOI: 10.1016/j.apenergy.2014.11.018
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    7. Wang, Chenguang & Gong, Guangcai & Su, Huan & Wah Yu, Chuck, 2015. "Efficacy of integrated photovoltaics-air source heat pump systems for application in Central-south China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 49(C), pages 1190-1197.
    8. Fei Wang & Rijing Zhao & Wenming Xu & Dong Huang & Zhiguo Qu, 2021. "A Heater-Assisted Air Source Heat Pump Air Conditioner to Improve Thermal Comfort with Frost-Retarded Heating and Heat-Uninterrupted Defrosting," Energies, MDPI, vol. 14(9), pages 1-13, May.
    9. Song, Mengjie & Xia, Liang & Deng, Shiming, 2016. "A modeling study on alleviating uneven defrosting for a vertical three-circuit outdoor coil in an air source heat pump unit during reverse cycle defrosting," Applied Energy, Elsevier, vol. 161(C), pages 268-278.
    10. Zhang, Qunli & Zhang, Lin & Nie, Jinzhe & Li, Yinlong, 2017. "Techno-economic analysis of air source heat pump applied for space heating in northern China," Applied Energy, Elsevier, vol. 207(C), pages 533-542.
    11. Yi Zhang & Guanmin Zhang & Aiqun Zhang & Yinhan Jin & Ruirui Ru & Maocheng Tian, 2018. "Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review," Energies, MDPI, vol. 11(10), pages 1-36, October.
    12. Wang, Feng & Liang, Caihua & Zhang, Xiaosong, 2018. "Research of anti-frosting technology in refrigeration and air conditioning fields: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 707-722.
    13. Zeng, Cheng & Liu, Shuli & Shukla, Ashish, 2017. "Adaptability research on phase change materials based technologies in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 145-158.
    14. Liu, Hongxun & Mauzerall, Denise L., 2020. "Costs of clean heating in China: Evidence from rural households in the Beijing-Tianjin-Hebei region," Energy Economics, Elsevier, vol. 90(C).
    15. Bottarelli, M. & Bortoloni, M. & Su, Y., 2019. "On the sizing of a novel Flat-Panel ground heat exchanger in coupling with a dual-source heat pump," Renewable Energy, Elsevier, vol. 142(C), pages 552-560.
    16. Zhang, Shaoliang & Liu, Shuli & Shen, Yongliang & Shukla, Ashish & Mazhar, Abdur Rehman & Chen, Tingsen, 2024. "Critical review of solar-assisted air source heat pump in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 193(C).
    17. Ni, Long & Dong, Jiankai & Yao, Yang & Shen, Chao & Qv, Dehu & Zhang, Xuedan, 2015. "A review of heat pump systems for heating and cooling of buildings in China in the last decade," Renewable Energy, Elsevier, vol. 84(C), pages 30-45.
    18. Zou, Deqiu & Ma, Xianfeng & Liu, Xiaoshi & Zheng, Pengjun & Cai, Baiming & Huang, Jianfeng & Guo, Jiangrong & Liu, Mo, 2017. "Experimental research of an air-source heat pump water heater using water-PCM for heat storage," Applied Energy, Elsevier, vol. 206(C), pages 784-792.
    19. Shucai Bai & Fangyi Li & Wu Xie, 2022. "Green but Unpopular? Analysis on Purchase Intention of Heat Pump Water Heaters in China," Energies, MDPI, vol. 15(7), pages 1-19, March.
    20. Liu, Jun & Wang, Fenghao & Cai, Wanlong & Wang, Zhihua & Li, Chun, 2020. "Numerical investigation on the effects of geological parameters and layered subsurface on the thermal performance of medium-deep borehole heat exchanger," Renewable Energy, Elsevier, vol. 149(C), pages 384-399.

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