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Studying the radiation effect on heat exchange characteristics of a circular duct | ||
| Journal Of Wassit For Science & Medicine | ||
| Article 1, Volume 4, Issue 2, 2011, Pages 148-161 | ||
| Author | ||
| Mohammed Abdulkhabeer Ali Al-yasiri | ||
| Abstract | ||
| As known in most heat transfer applications such as; air conditioning and refrigeration systems, and commercial design of heat exchangers, commonly ignore the effect of heat radiation because heat radiation equation contains 4th exponential order of temperature which makes mathematical analysis very complicated . In the present study, the influence of heat radiation is taken into account when computing heat transfer characteristics of a circular duct and the results are compared with those neglecting heat radiation. It is found that, in some practical conditions, the heat radiation effect can not be ignored especially in cases of lower ambient convection heat coefficients and larger surface emissivities, as well as of a smaller size duct or greater duct conductivity or internal fluid convection coefficients, even though the temperature-difference between inner and outer fluid-temperatures of the duct is very low (such as 1Co ). In most situations, ignoring heat radiation is likely to produce large errors and degrade the design quality of a heat exchanger. It is also proved that a larger surface emissivity can greatly improve the performance of a heat exchanger. | ||
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