碩士 / 國立成功大學 / 機械工程學系碩博士班 / 90 / The main task of the thesis is to estimate the heat transfer coefficient on the double plate finned-tube evaporator under frosting condition. Researches will include numerical and experimental works; the numerical work is to present the relationship between the thickness of frost and the heat transfer coefficient, and the experimental work is to obtain the temperature data.
The numerical method based on the hybrid scheme of the Laplace transform method and central different method in conjunction with the least-squares scheme is used to solve the two-dimensional inverse heat conduction problems for evaluating heat transfer coefficient. The least-squares minimization technique is applied to minimize the sum of the squares of the deviations between the calculated and curve-fitted temperature measurements. In the inverse heat conduction problem, slight inaccuracies in the measured interior temperatures can affect the accuracy of estimated the thermal properties. Thus the effect of measurement errors on the estimation of heat transfer coefficient will be investigated in the present analysis. A plate finned-tube evaporator is set up in conjunction with the other experimental equipment for measuring the frost thickness and tube temperature. The heat transfer coefficient and heat flux on the fin under frosting condition can be determined by using the present numerical method and the temperature measurements.
| Identifer | oai:union.ndltd.org:TW/090NCKU5490149 |
| Date | January 2002 |
| Creators | Yung-Yi Hsu, 許永毅 |
| Contributors | Han-Taw Chen, 陳寒濤 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 59 |
Page generated in 0.0125 seconds