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Energies 2017, 10(12), 2006; https://doi.org/10.3390/en10122006

Performance Evaluation of a Desiccant Dehumidifier with a Heat Recovery Unit

1
Green Energy and Environment Research Lab., Industrial Technology Research Institute, Hsinchu 31040, Taiwan
2
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan
*
Author to whom correspondence should be addressed.
Received: 7 September 2017 / Revised: 23 October 2017 / Accepted: 14 November 2017 / Published: 1 December 2017
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Abstract

In order to effectively increase the drying rate and reduce the energy consumption, a dryer which reduces the air humidity at the dryer inlet using desiccant and regenerates the desiccant by recovering waste heat using a heat pipe heat exchanger was developed in this study. Both the adsorption rate and desorption rate of the dryer were measured at several ambient temperatures ranging from 15 °C to 35 °C, relative humidity levels of air ranging from 20% to 85%, and airflow rates ranging from 30 m3/h to 150 m3/h. The results showed that the adsorption rate in an environment of high relative humidity of air was 4.89 times higher than that of low relative humidity of air at 15 °C. Moreover, the difference in adsorption rate between two given relative humidity of air increased as the ambient temperature decreased. The specific energy consumption estimated with both energy consumption during desorption and the desorption rate indicated that the energy consumption was 8.27 kJ/g H2O without using recovered heat, while the energy consumption was 4.77 kJ/g H2O using recovered heat at 130 °C. View Full-Text
Keywords: adsorption; heat pipe heat exchanger; dryer; energy consumption adsorption; heat pipe heat exchanger; dryer; energy consumption
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Yang, K.-S.; Wang, J.-S.; Wu, S.-K.; Tseng, C.-Y.; Shyu, J.-C. Performance Evaluation of a Desiccant Dehumidifier with a Heat Recovery Unit. Energies 2017, 10, 2006.

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