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Pulse-Width-Modulation Control of a Heat Pump Dryer with Cascade Evaporators and Parallel-Flow Condensers

Authors:

A. J. Fernando ,

University of Peradeniya, LK
About A. J.

Postgraduate Institute of Agriculture

 

Department of Agricultural Engineering and Soil Science, Faculty of Agriculture, Rajarata University of Sri Lanka

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K. S. P. Amaratunga,

University of Peradeniya, LK
About K. S. P.
Department of Agricultural Engineering, Faculty of Agriculture
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D. A. N. Dharmasena,

University of Peradeniya, LK
About D. A. N.
Department of Agricultural Engineering, Faculty of Agriculture
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R. M. R. D. Abeyrathna,

University of Peradeniya, LK
About R. M. R. D.
Department of Agricultural Engineering, Faculty of Agriculture
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I. L. Gajasinghe,

Rajarata University of Sri Lanka, LK
About I. L.
Department of Agricultural Engineering and Soil Science, Faculty of Agriculture
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H. S. T. Weerakoon,

Rajarata University of Sri Lanka, LK
About H. S. T.
Department of Agricultural Engineering and Soil Science, Faculty of Agriculture
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E. M. A. C. Ekanayake,

University of Peradeniya, LK
About E. M. A. C.
Postgraduate Institute of Agriculture
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D. M. S. P. Bandara

National Institute of Postharvest Management, Anuradhapura, LK
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Abstract

Heat pump drying systems require a method to change the inflow air temperature of the drying chamber. Pulse-widthmodulation (PWM) technique with duty cycle provides a measure of controlling the voltage supplied to the electric motors. Therefore, we conducted this research to PWM control a heat pump dryer to change the air circuit parameters. In the Parallel-Flow condensers, inlet and outlet temperatures, and relative humidity, data were collected, and the average temperature values were recorded. The duty cycle was changed by developing a program using the Python programming language. An Excel-based psychrometric calculator was developed to analyze the collected data. The average condenser outlet temperatures were 56.6±0.1℃, 54.9±0.1℃, and 52.6±0.1℃, and the average condenser inlet temperatures were 43.2±0.0℃, 42.8±0.1℃, and 41.2±0.1℃ for 60%, 80%, and 100% duty cycles, respectively. The power consumption rate of the condenser reduced with an increasing duty cycle. The results concluded that the PWM control system is a viable method to control the inflow air temperature to the drying chamber.
How to Cite: Fernando, A.J., Amaratunga, K.S.P., Dharmasena, D.A.N., Abeyrathna, R.M.R.D., Gajasinghe, I.L., Weerakoon, H.S.T., Ekanayake, E.M.A.C. and Bandara, D.M.S.P., 2021. Pulse-Width-Modulation Control of a Heat Pump Dryer with Cascade Evaporators and Parallel-Flow Condensers. Tropical Agricultural Research, 33(1), pp.9–17. DOI: http://doi.org/10.4038/tar.v33i1.8532
Published on 29 Dec 2021.
Peer Reviewed

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