Abstract
Effects of flow directions of the heating medium on heat transfer performance of upward evaporating refrigerant flows in a plate-fin heat exchanger with single refrigerant channel were examined using R134a as the refrigerant. The refrigerant channel was sandwiched by two water channels. Hot water flew upward or downward to form a parallel or counter flow heat exchange. To understand the heat flux distribution the temperature distributions on the outside wall of the water channel were visualized by an IR camera. As the results, it was shown that the difference in heat transfer rate between the parallel and counter flow was a little because of the large temperature difference in heat transfer. The pressure loss of the refrigerant flow was larger for the parallel flow than the counter flow. It could be estimated from the wall temperature distribution that the increase in pressure loss might be caused by inhomogeneous phase distribution of refrigerant flow.
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