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Performance simulation and optimization of new radiant floor heating based on micro heat pipe array

Building Simulation 2022年第7期15卷 1295-1308页

作者： Heran Jing Zhenhua Quan Ruixue Dong Limin Hao Yunhan Liu Yaohua Zhao Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology Beijing University of TechnologyBeijing 100124China

This paper proposes two new radiant floor heating structures based on micro heat pipe array(MHPA),namely cement-tile floor and keel-wood *** numerical models for these different floor structures are established and verified by *** temperature distribution and heat transfer process of each part are comprehensively obtained,and the structure is *** results show that the cement-tile floor has the better heat transfer performance of the *** under the same inlet water temperature and flow rate,the keel-wood floor's surface temperature distribution is about 2℃ lower than that of the cement-tile *** inlet water temperature of cement-tile floor is about 10℃ lower than that of keel-wood structure when the floor surface temperature is the *** a longitudinal heat transfer above MHPA,the floor surface temperature decreases by 0.5℃ for every 10 mm filling layer *** order to reduce the non-uniformity of the floor's surface temperature and improve the thermal comfort of the heated room,the optimal structure for a floor is given,with the maximum surface temperature difference reduced by 3.35℃.We used research focusing on new radiant floor heating,with advantages including high efficiency heat transfer,low water supply temperature,simple waterway structure,low resistance and leakage risk,to provide theory and data to support the application of an effective radiant floor heating based on MHPA.

关键词： radiant floor heating micro heat pipe array numerical simulation heat transfer

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Evaluation of the thermal performance of radiant floor heating system with the influence of unevenly distributed solar radiation based on the theory of discretization

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Building Simulation 2023年第1期16卷 105-120页

作者： Jiacheng Zheng Tao Yu Bo Lei Xiujing Luo School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China

In the building with many transparent envelopes,solar radiation can irradiate on the local surface of floor and cause *** local thermal comfort in the room will be dissatisfactory and the thermal performance of radiant floor will be strongly ***,in many current calculation models,solar radiation on the floor surface is assumed to be uniformly distributed,resulting in the inaccurate evaluation of the thermal performance of the radiant *** this paper,a calculation model based on the theory of discretization and the RC thermal network is proposed to calculate the dynamic thermal performance of radiant floor with the consideration of unevenly distributed solar ***,the discretization model is experimentally validated and is used to simulate a radiant floor heating system of an office room in *** is found that with the unevenly distributed solar radiation,the maximum surface temperature near the south exterior window can reach up to 35.6℃,which exceeds the comfort temperature limit and is nearly 8.5℃higher than that in the north ***,the heating capacity of the radiant floor in the irradiated zone can reach up to 171 W/m^(2),while that in the shaded zone is only 79 W/m^(2).The model with the assumption of uniformly distributed solar radiation ignores the differences between the south and north zones and fails to describe local overheating in the irradiated *** contrast,the discretization model can more accurately evaluate the thermal performance of radiant floor with the influence of real solar *** on this discretization model,novel design and control schemes of radiant floor heating system can be proposed to alleviate local overheating and reduce heating capacity in the irradiated zone.

关键词： radiant floor heating solar radiation simplified model thermal performance

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