Temperature Reduction in Attic with Flat Metal Sheet Roof Cooled by CLOHP

Main Article Content

Nopparat Seehawong
Ninnart Rachapradit
Piyanun Charoensawan

Abstract

This research developed a prototype of a flat metal sheet roof utilizing closed-loop oscillating heat pipe  (CLOHP) to dissipate heat from the attic. The study examined various types of flat metal sheet roofs and the effects of solar intensity, using a solar simulator equipped with halogen lamps to replicate solar energy. Experimental results revealed that as solar intensity increased, the attic temperature also rose. The flat metal sheet roof equipped with closed-loop oscillating heat pipe, with forced heat convection via a fan, exhibited the best heat transfer efficiency. The attic temperature was reduced to a minimum of 38.3°C at a maximum solar intensity of 600 W/m². This indicates that the heat pipes effectively draw heat from the metal sheet roof surface and transfer it to the atmosphere before it enters the attic.

Article Details

How to Cite
Seehawong, N., Rachapradit, N., & Charoensawan, P. (2025). Temperature Reduction in Attic with Flat Metal Sheet Roof Cooled by CLOHP. Journal of Energy and Environment Technology of Graduate School Siam Technology College, 12(1), 41–50. retrieved from https://ph01.tci-thaijo.org/index.php/JEET/article/view/260858
Section
Research Article

References

A. Noelia, C. Erica, and C.M. Alicia, “Urban Passive Cooling. Aging Effects on Optical Properties of Roof Tiles”, Energy Procedia, 57, 2014, pp. 3181-3190.

P. Charoensawan, S. Khandekar, M. Groll, and P. Terdtoon, “Closed Loop Pulsating Heat Pipes Part A: Parametric Experimental Investigations”, Applied Thermal Engineering, 23, 2003, pp. 2009–2020.

S. Khandekar, P. Charoensawan, M. Groll, and P. Terdtoon, “Closed Loop Pulsating Heat Pipes Part B: Visualization and Semi-Empirical Modeling”, Applied Thermal Engineering, 23, 2003, pp. 2021–2033.

P. Charoensawan, and P. Terdtoon, “Thermal Performance of Horizontal Closed-Loop Oscillating Heat Pipes”, Applied Thermal Engineering, 28, 2008, pp. 460-466.

C. Li, and J. Li, “Thermal Characteristics of A Flat Plate Pulsating Heat Pipe Module For Onsite Cooling of High Power Server CPUs”, Thermal Science and Engineering Progress, 37, 2023, 101542.

Y.F. Maydanik, V.I Dmitrin, and V.G. Pastukhov, “Compact Cooler For Electronics on The Basis of A Pulsating Heat Pipe”, Applied Thermal Engineering, 29, 2009, pp. 3511-3517.

M. Arab, M. Soltanieh, and M.B. Shafii, “Experimental Investigation of Extra-Long Pulsating Heat Pipe Application in Solar Water Heaters”, Experimental Thermal and Fluid Science, 42, 2012, pp. 6-15.

P. Charoensawan, P. Wilaipon, and N. Seehawong, “Flat Plate Solar Water Heater With Closed-Loop Oscillating Heat Pipes”, Thermal Science, 25, 2021, pp. 3607-3614.

H. Yang, J. Wang, N. Wang, and F. Yang, “Experimental Study on A Pulsating Heat Pipe Heat Exchanger for Energy Saving in Air-Conditioning System in Summer”, Energy & Buildings, 197, 2019, pp. 1–6.

L.H. Saw, M.C. Yew, M.K. Yew, W.T. Chong, H.M. Poon, W.S. Liew, and W.H. Yeo, “Development of The Closed Loop Pulsating Heat Pipe Cool Roof System for Residential Buildings”, Case Studies in Thermal Engineering, 28, 2021, pp. 1-11.

P. Charoensawan, Heat pipe technologies. Focus Printing, Phitsanulok, 2012.

F.P. Incropera, D.P. Dewitt, T.L Bergman, and A.S. Lavine, Fundamentals of Heat and Mass Transfer. 6th Edition, John Wiley & Sons (Asia) Pte Ltd, 2007.