Abstract
Heat pump dryer (HPD) performance described by computer simulation results in Parts 1 and 2 of this series of papers is here verified by experiments. An HPD designed to be operated in four configurations—two open systems and two partially closed systems—has been built. The variables in the experiments are the air flow rate, the dryer load, the ambient condition (day and night) and, for the partially closed systems, the recirculation air ratio and the evaporator bypass air ratio. The parameters used for the verification are the compressor power, the properties of air entering the dryer, the coefficient of performance, the moisture extraction rate and the specific moisture extraction rate. It is found that the experimental results agree with the simulation results within an acceptable error tolerance. In order to predict the HPD performance accurately, a fine tuning of the compressor model and the pressure drop in two-phase flow of the refrigerant are recommended. © 1997 by John Wiley & sons, Ltd.
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