Experimental Study on Heat Transfer Coefficients in an Office Room with a Radiant Ceiling During Low Heating Loads

Piotr Michalak ()
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Piotr Michalak: Department of Power Systems and Environmental Protection Facilities, Faculty of Mechanical Engineering and Robotics, AGH University of Krakow, al. A. Mickiewicza 30, 30-059 Krakow, Poland

Energies, 2025, vol. 18, issue 7, 1-19

Abstract: Estimation of the heating or cooling capacity of radiant systems requires selecting appropriate internal heat transfer coefficients by convection (CHTCs) and radiation (RHTCs). Due to practical reasons, their measurement during the normal use of buildings is very troublesome. This study attempts to present the results of measurements of CHTCs and RHTCs taken in an office room located in a passive building with a heated concrete ceiling. Special attention was paid to the proper choice of reference temperatures. For better accuracy, view factors for radiant heat exchange were calculated using Matlab. Average values of CHTCs and RHTCs calculated from measurements amounted to 0.80 W/m 2 K and 5.66 W/m 2 K. RHTCs showed a significant correlation against the ceiling temperature, with the coefficient of determination being R 2 = 0.96. Finally, the total heat transfer coefficient of 6.47 W/m 2 K was obtained. These values are comparable with other studies and standards and confirm that measurements were performed correctly.

Keywords: heat transfer coefficient; convection; radiation; heat flux measurement; concrete ceiling heating (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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