EXPERIMENTAL EXAMINATION OF HEAT TRANSFER PERFORMANCE OF THE HEATED RADIANT WALL SYSTEM

Aliihsan Koca

doi:10.18186/thermal.465641

Abstract

In recent years, radiant heating systems have been catching more observation under favor of the many advantages such as; energy saving and thermal comfort. However, owing the fact that limited information on the system dynamics and the heat transfer characteristics of radiant systems, conventional systems are still preferred to radiant systems. Thereupon, radiant ceiling and floor systems are favored to wall systems. Also previous researchers have focused on radiant ceiling and floor systems instead of radiant wall systems. For this reason, a controlled climatic test set-up was built and detailed examinations were conducted. In this regard, to evaluate the heat transfer coefficients of the radiant wall panels, 10 different test cases were run using different supply water temperatures. On the basis of the obtained measurements, in the steady state, heat transfer coefficients, depending on the characteristic temperature differences and the heat transfer rates have been calculated. According to the results, the approximate mean values of 2.40, 5.49 and 8.29 W/m2K were evaluated, respectively for the convective, radiant and total heat transfer coefficients of radiant wall heating systems.&nbsp;

Highlights

Scientists and engineers have been seeking alternative heating-cooling systems to decrease energy usage of buildings and increasing thermal comfort levels
Considering the general results of the previous works, authors are agreed that radiant systems have many advantages with regard to energy efficiency and thermal comfort, compared to conventional systems
Koca et al [17] experimentally investigated radiant ceiling-wall integrated cases. They reported that, when the wall heating system is integrated with the ceiling, total HTC of wall decreases about 18%, while the total ceiling HTC increases about 5%

Summary

INTRODUCTION

Scientists and engineers have been seeking alternative heating-cooling systems to decrease energy usage of buildings and increasing thermal comfort levels. [12] conducted experimental studies for 18 different radiant ceiling panel configurations to evaulate the convection, radiation and total HTC’s. Miriel et al [14] examined thermal performances of radiant systems for both heating and cooling operations According to their results, in cooling cases, heat transfer took place via convection by 66%, while it was about 20 % for wall heating cases. Obtained results were compared with experimental measurements, which were carried with same conditions of ANN model They proposed; radiant HTC as to be 5 W/m2.K, convective HTC as to be 2.7 W/m2.K and total HTC as to be 9 W/m2.K. Erikci Çelik et al [19] studied heat transfer performance of a hybrid wall panel, numerically. Kanbur et al [20] calculated the heat transfer capacities of the radiant panels, numerically

Objectives

C2 C3 C4 C5 C6 C7 C8 C9 C10

RESULT

Findings

C3 C4 C5 C6 C7 C8 C9 C10