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Performance Analysis of Heat Pump Dryer with Unit-Room in Cold Climate Regions

1,2, 3, 1,2, 1,2, 1,2,*, 1 and 1,4
1
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Sustainable Buildings Research Centre (SBRC), University of Wollongong (UOW), Wollongong, NSW 2519, Australia
4
Guangdong Institute of Modern Agricultural Equipment, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3125; https://doi.org/10.3390/en12163125
Received: 18 June 2019 / Revised: 30 July 2019 / Accepted: 7 August 2019 / Published: 14 August 2019
PDF [1354 KB, uploaded 14 August 2019]

Abstract

This study presents the development and evaluation of a novel partially open-loop heat pump dryer with a unit-room (HPDU). The unit-room was designed to enable the ambient air to be mixed with the return air, thereby reducing the influence of the ambient air on the system performance, while maintaining a high system thermal efficiency. A modelling system for the HPDU was developed and validated based on a real-scale experimental study. By using the modelling system, the system characteristics under different ambient conditions and bypass factors were analyzed. The energy benefit of the proposed HPDU was quantified through a comparative study with a closed-loop heat pump dryer (CHPD). It is evident that a maximal specific moisture extraction rate (SMER) and a minimal total energy consumption (TEC) existed when changing the bypass factor of the HPDU under certain ambient temperatures. Compared to the CHPD, the coefficient of performance (COP) of the HPDU increased by up to 39.56%, presenting a significant energy benefit for the application of HPDU.
Keywords: heat pump dryer; energy efficiency; partially open-loop; specific moisture extraction rate heat pump dryer; energy efficiency; partially open-loop; specific moisture extraction rate
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yuan, Y.; Lin, W.; Mao, X.; Li, W.; Yang, L.; Wei, J.; Xiao, B. Performance Analysis of Heat Pump Dryer with Unit-Room in Cold Climate Regions. Energies 2019, 12, 3125.

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