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Experimental study on refrigerant direct‑condensation floor radiant heating air‑source heat pump
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Jianhui NIU, Tianshu LYU, Haichao WANG, Yongliang LI, Yuegang BU
Fluid Machinery | 2025, 53(5) : 15 - 21
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Fluid Machinery | 2025, 53(5): 15-21
Experimental study on refrigerant direct‑condensation floor radiant heating air‑source heat pump
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Jianhui NIU, Tianshu LYU, Haichao WANG, Yongliang LI, Yuegang BU
Affiliations
  • Hebei Renewable Energy Heating Engineering Technology Center，Hebei University of Architecture，Zhangjiakou 075000，China
Published: 2025-05-30 doi: 10.3969/j.issn.1005-0329.2025.05.003
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To address the dual challenges of high building energy consumption and increasing occupant comfort demands，a direct‑condensation capillary radiant floor heating terminal was designed.A refrigerant direct‑condensation floor heating air‑source heat pump system was constructed in an environmental chamber.Temperature characteristics of the heating terminal and heat pump heating performance variations under different outdoor temperatures were investigated，with comparative analysis against bare‑tube capillary radiant terminals.Results show that under varying outdoor temperatures，bare‑tube capillary walls heat faster than capillary walls under cement layers.Cement floor surface temperature stabilization lags behind capillary wall temperature stabilization.At 0 ℃ outdoor temperature，the temperature difference between exhaust and subcooled sections of bare‑tube capillaries is only 1.6 ℃，whereas for cement floors it reaches 4.4 ℃.At -10 ℃ outdoor temperature，the cement‑embedded capillary floor system achieves heating capacity of 1.67 kW and COP of 4.20，representing 21.6% and 13.9% decreases compared to bare‑tube capillary terminals.This study provides reference for designing capillary radiant floor heating systems.

air‑source heat pump  /  refrigerant direct‑condensation  /  floor radiation  /  heating performance
牛建会, 吕天舒, 王海超, 李永亮, 卜跃刚. 制冷剂直凝地板辐射供暖空气源热泵试验研究. 流体机械, 2025 , 53 (5) : 15 -21 . DOI: 10.3969/j.issn.1005-0329.2025.05.003
Jianhui NIU, Tianshu LYU, Haichao WANG, Yongliang LI, Yuegang BU. Experimental study on refrigerant direct‑condensation floor radiant heating air‑source heat pump[J]. Fluid Machinery, 2025 , 53 (5) : 15 -21 . DOI: 10.3969/j.issn.1005-0329.2025.05.003
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Year 2025 volume 53 Issue 5
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Article Info
doi: 10.3969/j.issn.1005-0329.2025.05.003
  • Receive Date：2024-09-04
  • Online Date：2026-10-20
  • Published：2025-05-30
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  • Received：2024-09-04
  • Revised：2025-03-16
Affiliations
    Hebei Renewable Energy Heating Engineering Technology Center，Hebei University of Architecture，Zhangjiakou 075000，China
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https://castjournals.cast.org.cn/joweb/ltjx/EN/10.3969/j.issn.1005-0329.2025.05.003
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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