Description

Because China is actively promoting island-reef construc-tion,researchonlow-energybuildingdesigninisland-reefareas with a special climate has received much attention recently. The convective heat transfer coefficient(CHTC)atanexterior build-ing surface is crucial for calculating the air-conditioning load precisely. This study explores the applicability and feasibility of the naphthalene sublimation technique in island-reef areas. First, a field survey on testing the environment in island-reef areas was performed, indicating an experimental scheme in this area should be as simple as possible. Subsequently, the naph-thalene sublimation technique, in which experimental devices possessed the advantages of easy operation and convenient carry, was adopted to measure CHTC in this area. Finally, the effect of measuring parameters on CHTC results and the error level throughout the experiment were analyzed. Results showed that the relationship betweenCHTCand wind speed wasCHTC = 5.56 + 4.48u (where CHTC is W/m2·K and u is m/s), with a high correlation coefficient square of 0.94. Additionally, the CHTCpredictive formula was reliable, with a mean percentage errorof2.50%forestimatingCHTCsin island-reefareas.More-over, the reliability of CHTC testing results was almost imper-vious tooutdoorenvironmentin island-reef areas.Furthermore, based on the error propagation theory, the overall uncertainty ofCHTCin the experiment was merely 5.4%, ensuring the accu-racy of experimental results. This study contributes to popular-izing the simplified CHTC testing method and achieving a reasonable CHTC in island-reef areas.

Citation: 2019 Annual Conference, Kansas City, MO, Technical Papers

Product Details

Published:

2019

Number of Pages:

10

Units of Measure:

Dual

File Size:

1 file , 3.8 MB

Product Code(s):

D-KC-19-004