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THERMAL SCIENCE
International Scientific Journal
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STUDY ON HEAT TRANSFER PERFORMANCE OF ULTRA-LOW TEMPERATURE RADIANT HEATING MODULES
ABSTRACT
To address the low energy efficiency of renewable energy, the high water supply temperature, and the high power consumption of pumps, this paper propose an assembled capillary radiant heating floor based on solar collector heating and analyze its heat transfer performance. It is found that the capillary tube layout using the I-type laying method is more uniform than the U-type laying method , and the overall temperature is higher. And the narrower the pipe spacing is, the greater influence on the floor surface average temperature is. For type I paving, the optimal main pipe supply flow range is 0.2 ~ 0.25m/s, and the optimal water supply temperature range is 32℃~36℃. Through the orthogonal test analysis of U-type floor, the results show that the variance S of the corresponding water supply temperature is 9.59, while the S value of the corresponding water supply velocity is only 0.03.In both I-type and U-type paving methods, the influence of water supply temperature is greater than water supply flow rate on the thermal performance of the floor.
KEYWORDS
Ultra-low temperature radiant heating, Assembled floor, Orthogonal test design, numerical simulation, thermal performance
PAPER SUBMITTED: 2025-08-17
PAPER REVISED: 2025-12-30
PAPER ACCEPTED: 2026-01-15
PUBLISHED ONLINE: 2026-04-12
DOI REFERENCE: https://doi.org/10.2298/TSCI250817031G
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© 2026 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence