STUDY ON PERFORMANCE OF MICROCHANNEL SEPARATED HEAT PIPE SYSTEM COUPLED WITH RADIATIVE SKY COOLING

Cheng Gui; Chen Xiaoming; Li Xingyou

doi:10.19912/j.0254-0096.tynxb.2024-2178

PDF(3495 KB)

Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 782-790. DOI: 10.19912/j.0254-0096.tynxb.2024-2178

STUDY ON PERFORMANCE OF MICROCHANNEL SEPARATED HEAT PIPE SYSTEM COUPLED WITH RADIATIVE SKY COOLING

Cheng Gui, Chen Xiaoming, Li Xingyou

Author information +

History +

Abstract

To enhance the energy efficiency of microchannel separated heat pipes, a microchannel separated heat pipe system coupled with sky radiative cooling has been proposed. A numerical heat transfer model of the proposed system is established based on the volume-of-fluid method. The is characteristics of the system under various effective sky temperatures are numerically studied. The results indicate that compared to traditional microchannel separated heat pipe systems, the coupled system has higher working fluid flow rates and heat transfer coefficients, and therefore higher cooling capacity and energy efficiency ratio （EER）. Due to the influence of solar radiation, energy saving potential by the coupled system is higher at night than in the daytime, with an improvement rate over the traditional system of 11%-22.7% and 6.6%-13.8%, respectively. The lower the effective sky temperature, the higher the energy saving potential can be obtained by the coupled system. Additionally, the influences of radiative cooling heat exchanger area, airflow rate, and indoor air temperature on the performance of the coupled system are discussed. It is found that the larger the radiative cooling heat exchanger area, the higher the cooling capacity and EER can be obtained. As the radiative cooling heat exchanger area increases from 0.15 m² to 1.79 m², the cooling capacity rises from 719 W to 861 W, and the EER ranges from 9.22 to 11.04, which are increased by 19.7%.

Key words

heat pipes / radiative cooling / multiphase flow / heat transfer / numerical simulation

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Cheng Gui, Chen Xiaoming, Li Xingyou. STUDY ON PERFORMANCE OF MICROCHANNEL SEPARATED HEAT PIPE SYSTEM COUPLED WITH RADIATIVE SKY COOLING[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 782-790 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2178

References

[1] 张泉. 数据中心节能技术与应用[M]. 2版. 北京: 机械工业出版社, 2023: 6-15.
ZHANG Q.Energy-saving technology and application of data center[M]. 2nd ed. Beijing: China Machine Press, 2023: 6-15.
[2] WANG N B, GUO Y H, YU H X, et al.Investigation on performance enhancement of micro-channel separated heat pipe in data center: a coupled heat-mass-flow characterization approach[J]. Applied thermal engineering, 2024, 248: 123327.
[3] ZHOU F, CHEN J, MA G Y, et al.Energy-saving analysis of telecommunication base station with thermosyphon heat exchanger[J]. Energy and buildings, 2013, 66: 537-544.
[4] 张泉, 吴亚凝, 凌丽, 等. 基站用微通道分离式热管换热性能实验研究[J]. 湖南大学学报(自然科学版), 2016, 43(7): 139-145.
ZHANG Q, WU Y N, LING L, et al.Experimental investigation on heat transfer characteristic of micro-channel separate heat pipe in telecommunication base station[J]. Journal of Hunan University (natural sciences), 2016, 43(7): 139-145.
[5] 胡张保, 张志伟, 李改莲, 等. 采用微通道蒸发器的分离式热管空调传热性能的试验研究[J]. 流体机械, 2015, 43(11): 68-71.
HU Z B, ZHANG Z W, LI G L, et al.Experimental investigation on the heat transfer performance of the separate type heat pipe air conditioning with a microchannel evaporator[J]. Fluid machinery, 2015, 43(11): 68-71.
[6] LING L, ZHANG Q, YU Y B, et al.Experimental study on the thermal characteristics of micro channel separate heat pipe respect to different filling ratio[J]. Applied thermal engineering, 2016, 102: 375-382.
[7] 郭晨玥, 潘浩丹, 徐琪皓, 等. 天空辐射制冷技术发展现状与展望[J]. 制冷学报, 2022, 43(3): 1-14.
GUO C Y, PAN H D, XU Q H, et al.Current status and future perspectives of radiative sky cooling[J]. Journal of refrigeration, 2022, 43(3): 1-14.
[8] ZHAI H T, FAN D S, LI Q.Scalable and paint-format colored coatings for passive radiative cooling[J]. Solar energy materials and solar cells, 2022, 245: 111853.
[9] ZHAI Y, MA Y G, DAVID S N, et al.Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime radiative cooling[J]. Science, 355(6329): 1062-1066.
[10] WANG X, LIU X H, LI Z Y, et al.Scalable flexible hybrid membranes with photonic structures for daytime radiative cooling[J]. Advanced functional materials, 2020, 30(5): 1907562.
[11] 余才锐, 沈冬梅, 何伟, 等. 基于微通道热管和天空辐射制冷技术新型散热方式的试验研究[J]. 太阳能学报, 2020, 41(7): 251-258.
YU C R, SHEN D M, HE W, et al.Experimental study on novel heat dissipation based on sky radiative cooling and micro-channel heat pipe[J]. Acta energiae solaris sinica, 2020, 41(7): 251-258.
[12] 余才锐, 沈冬梅, 何伟, 等. 基于辐射制冷和微槽道热管的相变墙体实验研究[J]. 太阳能学报, 2020, 41(4): 123-128.
YU C R, SHEN D M, HE W, et al.Experimental research on phase change wall based on sky radiative cooling and micro-channel heat pipe[J]. Acta energiae solaris sinica, 2020, 41(4): 123-128.
[13] 严天, 黄志波, 高佳佳, 等. 自力式套管封装相变墙体排热系统及相变简化模型研究[J]. 建筑科学, 2019, 35(4): 22-27.
YAN T, HUANG Z B, GAO J J, et al.A pipe-encapsulated phase change material (PCM) wall system for self-activated heat removal and development of the simplified PCM model[J]. Building science, 2019, 35(4): 22-27.
[14] XU D W, YAN T, XU X H, et al.Study of the characteristics of the separated gravity heat pipe of a self-activated PCM wall system[J]. Energy, 2024, 298: 131237.
[15] YANG L L, WANG G, DUAN S X, et al.Structurally colored photonic crystal biomimetic microstructures for daytime radiative cooling[J]. ACS applied materials & interfaces, 2024, 16(45): 62827-62837.
[16] BRACKBILL J U, KOTHE D B, ZEMACH C.A continuum method for modeling surface tension[J]. Journal of computational physics, 1992, 100(2): 335-354.
[17] KIM M H, BULLARD C W.Air-side thermal hydraulic performance of multi-louvered fin aluminum heat exchangers[J]. International journal of refrigeration, 2002, 25(3): 390-400.
[18] YUE C, ZHANG Q, ZHAI Z Q, et al.CFD simulation on the heat transfer and flow characteristics of a microchannel separate heat pipe under different filling ratios[J]. Applied thermal engineering, 2018, 139: 25-34.
[19] 中国气象局气象信息中心气象资料室, 清华大学建筑技术科学系. 中国建筑热环境分析专用气象数据集[M]. 北京: 中国建筑工业出版社, 2005: 1-165.
China Meteorological Administration Meteorological Information Center Meteorological Data Office, Tsinghua University Department of Building Technology and Science. Special meteorological data set for thermal environment analysis of buildings in China[M]. Beijing: China Architecture & Building Press, 2005: 1-165.
[20] YD/T2770—2014, 通信基站用热管换热设备技术要求和试验方法[S].
YD/T2770—2014, Technical requirements and experimental methods of heat pipe exchanger for communication base station[S].
[21] 于传波, 张泉, 邹思凯. 数据中心热管背板送风对芯片温度影响的模拟研究[J]. 科学技术与工程, 2023, 23(28): 12091-12100.
YU C B, ZHANG Q, ZOU S K.Simulation study on effect of heat pipe backplane air supply on chip temperature in data center[J]. Science technology and engineering, 2023, 23(28): 12091-12100.