%0 Journal Article %1 Khan20121757 %A Khan, Mohammad S. %A Khan, Tariq S. %A Chyu, Ming-C. %A Ayub, Zahid H. %D 2012 %J International Journal of Refrigeration %K 2012 ammonia evaporation experiment heat-transfer plate-heat-exchanger pressure-drop %N 6 %P 1757 - 1765 %R 10.1016/j.ijrefrig.2012.05.019 %T Experimental investigation of evaporation heat transfer and pressure drop of ammonia in a 30° chevron plate heat exchanger %U http://dx.doi.org/10.1016/j.ijrefrig.2012.05.019 %V 35 %X Ammonia, an environment friendly natural refrigerant with attractive thermo-physical properties is a potential replacement of the synthetic refrigerants with high ozone depletion and global warming potentials. Experimental heat transfer and pressure drop data are obtained for two phase evaporation of ammonia in a commercial plate heat exchanger for symmetric 30°/30° chevron plates. The plate heat exchanger was configured in a single pass U-type counter flow arrangement with liquid ammonia evaporating in upward flow direction and glycol/water solution simulating the heat load in counter flow. Experiments were carried out for saturation temperatures ranging from −25 °C to −2 °C. The heat flux was varied between 21 kW m−2 and 44 kW m−2. Experimental results show significant effect of saturation temperature, heat and exit vapor quality on heat transfer coefficient and pressure drop. Two phase Nusselt number and friction factor correlations are proposed.

@article{Khan20121757, abstract = {Ammonia, an environment friendly natural refrigerant with attractive thermo-physical properties is a potential replacement of the synthetic refrigerants with high ozone depletion and global warming potentials. Experimental heat transfer and pressure drop data are obtained for two phase evaporation of ammonia in a commercial plate heat exchanger for symmetric 30°/30° chevron plates. The plate heat exchanger was configured in a single pass U-type counter flow arrangement with liquid ammonia evaporating in upward flow direction and glycol/water solution simulating the heat load in counter flow. Experiments were carried out for saturation temperatures ranging from −25 °C to −2 °C. The heat flux was varied between 21 kW m−2 and 44 kW m−2. Experimental results show significant effect of saturation temperature, heat and exit vapor quality on heat transfer coefficient and pressure drop. Two phase Nusselt number and friction factor correlations are proposed.}, added-at = {2012-11-21T13:06:44.000+0100}, author = {Khan, Mohammad S. and Khan, Tariq S. and Chyu, Ming-C. and Ayub, Zahid H.}, biburl = {https://www.bibsonomy.org/bibtex/2a416a07db730d2be6e786efbd5ad5475/thorade}, description = {ScienceDirect.com - International Journal of Refrigeration - Experimental investigation of evaporation heat transfer and pressure drop of ammonia in a 30° chevron plate heat exchanger}, doi = {10.1016/j.ijrefrig.2012.05.019}, interhash = {d58c5e6912e35a3fe61f1e8c4ac8cb61}, intrahash = {a416a07db730d2be6e786efbd5ad5475}, issn = {0140-7007}, journal = {International Journal of Refrigeration}, keywords = {2012 ammonia evaporation experiment heat-transfer plate-heat-exchanger pressure-drop}, number = 6, pages = {1757 - 1765}, timestamp = {2012-11-21T13:06:44.000+0100}, title = {Experimental investigation of evaporation heat transfer and pressure drop of ammonia in a 30° chevron plate heat exchanger}, url = {http://dx.doi.org/10.1016/j.ijrefrig.2012.05.019}, volume = 35, year = 2012 }