4.7 Article

Thermal response of wall implanted with heat pipes: Experimental analysis

Journal

RENEWABLE ENERGY
Volume 143, Issue -, Pages 1687-1697

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.05.123

Keywords

Wall implanted with heat pipes; Thermal response; Time lag; Decrement factor; Temperature rise coefficient

Funding

  1. Natural Science Foundation of Tianjin [17JCYBJC21400]

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A wall implanted with heat pipes (WIHP) features effective heat transfer between indoor and outdoor environments due to the pipe's unidirectional thermal conductivity: the implant also resolves the contradiction between the wall's insulation and solar energy utilization. The thermal performance of walls is crucial in terms of reducing a building's energy consumption and improving its indoor thermal environment. The heat transfer process of the condensing section is the focus of the present study. We establish a dynamic heat transfer model of the condensing section based on the Z-transfer function, and introduces the temperature rise coefficient (TRC) concept. The thermal response characteristics of an ordinary wall and WIHP are determined via theoretical analysis and experimentation. The WIHP shows a faster thermal response to weather variations than the ordinary wall. In a typical day, the efficient heat transfer and long running time (7 h 30 min) of the heat pipe improve the average inside-surface temperature of the WIHP by 0.5 degrees C and the average TRC by 0.16. A portion of the heat released from the pipe is also stored by the wall, which staves off temperature attenuation and minimizes temperature fluctuations in the inside surface, thereby creating a more comfortable indoor thermal environment. (C) 2019 Elsevier Ltd. All rights reserved.

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