Conjugate Gradient Method for Determination Unknown Thermal Contact Resistance of a Circular Fin Tube Heat Exchanger
碩士 === 逢甲大學 === 機械工程學系 === 89 === The objective of this dissertation is to analyze the contact heat transfer coefficient in circular fin tube heat exchanger by using inverse technique. The fins and tubes in circular fin tube type heat exchanger are not fabricated(shaped) together. The coordination o...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2001
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/85091120180514447193 |
| Summary: | 碩士 === 逢甲大學 === 機械工程學系 === 89 === The objective of this dissertation is to analyze the contact heat transfer coefficient in circular fin tube heat exchanger by using inverse technique. The fins and tubes in circular fin tube type heat exchanger are not fabricated(shaped) together. The coordination of the fins and tubes is determined by the contact heat transfer coefficient. However it is difficult to derive the contact heat transfer coefficient from only a measurement or simple calculations. Here we approach the contact heat transfer coefficient of circular fin tube heat exchanger by using the inverse technique in conjugate gradient method as well as make comparison to sequential regularization method.
The result shows that the deviation and distance of measuring points do affect the contact heat transfer coefficient. The lager the deviation and further the measuring distance from the surface, the more inaccurate the contact heat transfer coefficient is obtained. Hence, using the conjugate gradient method to estimate the contact heat transfer coefficient is better in accuracy compared to the sequential regularization method whether in terms of measuring deviation or distance.
|
|---|