Heat transfer characteristics of a gas-to-gas heat exchanger using heat pipes
The heat transfer characteristics of a gas-to-gas heat exchanger employing heat pipes as the heat transfer elements were examined. Experimental data obtained on the heat exchanger containing 66 finned heat pipes were compared with the values calculated by using various empirical and theoretical equations. A basic design procedure for gas-to-gas heat exchangers using heat pipes was then established. The results showed that: for the overall heat transfer coefficient, the measured values were in fair agreement with the values calculated using the empirical and theoretical equations; for the outside heat transfer film coefficient including the fins' thermal resistances, the measured values were in good agreement with the calculated values if a suitable compensation is made for the latter with respect to the average gas bulk temperature; vertical positioning of heat pipes is more advantageous than horizontal positioning; the difference in heat transfer performance between them becomes greater with the increase of heat flow through the heat pipes; and measurements of the pressure drop across the heat pipe bank show somewhat lower values than those calculated, but the equation used for calculation is considered feasible as a design formula.
- Research Organization:
- Hitachi Shipbuilding and Engineering Co., Osaka, Japan
- OSTI ID:
- 6339968
- Journal Information:
- Heat Transfer - Jpn. Res.; (United States), Vol. 7:1
- Country of Publication:
- United States
- Language:
- English
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