Heat transfer in pool boiling of ammonia/water mixture |
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Authors: | Hirofumi?Arima Email author" target="_blank">Masanori?MondeEmail author Yuhichi?Mitsutake |
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Institution: | (1) Department of Mechanical Engineering Saga University 1 Honjo-machi, Saga-shi, Saga 840 - 8502, Japan, |
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Abstract: | The nonazeotropic binary mixtures such as, methanol/water, ethanol/water and ammonia/water, have variable boiling and dew
points, depending on the combination of substance and those mass fraction. It is expected to have a higher performance as
a result of decreasing the thermodynamically irreversible loss, when there is a relevant mass fraction. Therefore, ammonia/water
mixture is expected to use as working fluid in small temperature difference power generation cycles and absorption refrigeration
cycles. However, few experiments were carried out for measuring heat transfer coefficient for ammonia/water mixture in the
world.
An experimental study has been carried out to measure boiling heat transfer coefficient of an ammonia/water mixture on a horizontal
heated surface at low pressure of 0.2, 0.4 and 0.7 MPa and at low mass fraction of 0 < C < 0.27 and at high pressure 0.7, 1.0 and 1.5 MPa and at mass fraction of 0.5 < C < 1.0 and at heat flux under critical heat flux the heat transfer coefficient are compared with existing correlations prediction
and a revised correlation can be proposed to predict them well. |
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Keywords: | Ammonia/water mixture Heat transfer coefficient Pool boiling |
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