03435nas|a2200373 i 4500 20260818133423.0 220200s1999 th uu m rtt 0| a1eng d .b11777424 AIT Thesis no.ET-99-13 Fu, Yonggang Heat transfer through roof with radiant barrier and shading effect of a three dimension object Bangkok : Asian Institute of Technology, 1999 103 leaves Thesis ; no. ET-99-13 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. School of Environment Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1999 Knowledge and understanding of heat transfer through a roof to an air-conditioned building have become a necessity for providing comfort of human being as well as for rational use of energy. The mechanism of heat transfer is a dynamic phenomenon influenced by many factors such as instantaneous solar radiation, thermal properties of materials, ambient and interior temperature. The objective of the experiments was to study the Thermal performance of a kind of reflectible surface-TYVEK in reducing the heat transfer. TYVEK was installed as ceiling with different configurations, and it was used to compared with other ceiling materials-cellocrate and acoustic board, results from measurement presented a significant reduction in heat flux through ceiling of TYVEK as ceiling than other ceiling materials. TYVEK installed as flat ceiling with forced ventilation was proved to be the best configuration in case of slope roof type, and TYVEK installed as flat ceiling in case of flat roof type was proved to be the best confoguration. This thesis also studied the shading effect of a three dimension object such as a tree ( the tree is assumed to be a ellispsoidal object by its shape), method has been developed to calculate the shaded area cast by a tree on an arbitrary plane at any given time, Experiments were conducted to evaluate the shading effect in reducing heat transfer through ceiling with flat roof when there was a shade on it. A computer model simulating heat transfer mechanism in the attic was used to calculate heat flux and temperature, finite difference method was used in that model to consider the transient heat transfer situation, good agreement was found between measurement and simulation which proved the validity of the model. Heat Transmission Surapong Chiraratananon, Chairperson Kumar, Sivanappan, Examination Committee Pham Hoang Luong, Examination committee Asian Institute of Technology. Thesis ; no. ET-99-13 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B12777 .b11777424 mnait u 240421 0 000222 m a u 0 mnait mnarc 22 40 Barcode : 30050120749626 CREATED : 2014-04-02 RECORD # : i12756064 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120365522 CREATED : 2016-06-15 RECORD # : i13037018 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 54706 54706 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.ET-99-13 30050120749626 2026-08-18 13:34:23 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ET-99-13 30050120365522 2026-08-18 13:34:23 2026-08-18 40