Experimental Study on Capillary Floor Radiation Heating System with Air-Source Heat Pump

Niu Jianhui; Wang Haichao; Lü Tianshu; Li Yongliang

doi:10.12465/j.issn.0253-4339.2025.01.046

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Experimental Study on Capillary Floor Radiation Heating System with Air-Source Heat Pump

Heat Pump Technology | 更新时间：2025-01-23

- Experimental Study on Capillary Floor Radiation Heating System with Air-Source Heat Pump
- Journal of Refrigeration Vol. 46, Issue 1, Pages: 46-52(2025)
- 作者机构：
  
  河北省可再生能源供热工程技术中心　河北建筑工程学院　张家口　 075000
- 作者简介：
  
  Niu Jianhui, female, Ph. D., associate professor, master supervisor, Department of Energy Engineering, Hebei University of Architecture, 86-15324033180, E-mail: zjknjh@163.com. Research fields: new-type refrigeration and heat pump system and its energy saving and environmental protection technology.
- 基金信息：
  
  Doctoral Research Initiation Fund Project of Hebei University of Architecture(B-202303);Graduate Innovation Fund Project of Hebei University of Architecture(XY2023052)
- DOI：10.12465/j.issn.0253-4339.2025.01.046
  CLC： TB61⁺1;TU832.1⁺6
- Received：27 September 2023，
  
  Revised：30 October 2023，
  
  Accepted：2023-12-12，
  
  Published：16 February 2025
- 稿件说明：
移动端阅览
Niu Jianhui, Wang Haichao, Lü Tianshu, et al. Experimental Study on Capillary Floor Radiation Heating System with Air-Source Heat Pump[J]. Journal of refrigeration, 2025, 46(1): 46-52.
DOI：

Niu Jianhui, Wang Haichao, Lü Tianshu, et al. Experimental Study on Capillary Floor Radiation Heating System with Air-Source Heat Pump[J]. Journal of refrigeration, 2025, 46(1): 46-52. DOI： 10.12465/j.issn.0253-4339.2025.01.046.

摘要

空气源热泵毛细管地板辐射供暖系统以制冷剂为热工质直接加热地板，具有系统简单、传热效果好的优点。搭建了空气源热泵毛细管地板辐射供暖实验装置，在不同室外环境温度下对平行布置的毛细管地板辐射末端进行供暖实验研究。实验结果表明：室外温度越低，毛细管地板辐射末端温度稳定所需时间越长，当室外温度为-5 ℃时，稳定时间为120 min；同一根毛细管壁面上排气入口端与凝液出口端温差较大，可达到6.40 ℃，2 cm厚水泥地板表面温差可达4.20 ℃；从毛细管壁至水泥地板表面竖向温差较小，不超过0.40 ℃，地板竖向传热效果良好；不同毛细管的同一位置处温差在0.80 ℃以内，温度均匀性良好；室外温度为-5 ℃时，机组稳定运行制热COP可达4.61，性能良好。

Abstract

The air-source heat pump capillary radiant floor heating system directly heats the floor using a refrigerant as the heat transfer fluid

which employs a simple system and promotes good heat transfer. This study developed an experimental device for capillary floor radiant heating with an air-source heat pump

and a heating experiment with parallel capillary floor radiant terminal was conducted at different outdoor ambient temperatures. The experimental results demonstrate that a longer time is required for the temperature of the capillary floor radiation terminal to reach steady as the outdoor temperature decreases. When the outdoor temperature was -5 ℃

the required time was 120 min. The temperature difference between the discharge inlet end and the condenser outlet end on the same capillary wall was large. The temperature difference on the capillary wall reached 6.40 ℃

while that on the surface of the 20 mm-thick cement floor reached 4.20 ℃. Conversely

the vertical temperature difference from the capillary wall to the cement floor surface was small

not exceeding 0.40 ℃

and the vertical heat transfer effect of the floor was good. The temperature difference at the same position of different capillaries was within 0.80 ℃

and the temperature uniformity was good. When the outdoor temperature was -5 ℃

the heating coefficient of performance of the unit reached 4.61 with good heating performance.

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references

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Related Institution

河北省可再生能源供热工程技术中心

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