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Experimental investigation on drying performance of an existed enclosed fixed frequency air source heat pump drying system
Tianjin Key Laboratory of Refrigeration Technology, School of Mechanical Engineering, Tianjin University of Commerce, Tianjin, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin, China.
Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, Chiba, Japan.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. Tianjin Key Laboratory of Refrigeration Technology, School of Mechanical Engineering, Tianjin University of Commerce, Tianjin, China.ORCID iD: 0000-0002-6279-4446
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2018 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 130, 735-744 p.Article in journal (Refereed) Published
Abstract [en]

As the quick development of industry drying technology, different heat pump drying systems were proposed in recent decades. Enclosed heat pump drying system was considered as the most widely used system. For an existed enclosed fixed frequency heat pump drying system, drying time could be decreased by increasing air temperature at inlet of drying chamber. However, as a fundamental problem, system drying performance influenced by air flow ratio was not tested and reported in open literatures. Therefore, basing on adding an air bypass duct, drying performance of an enclosed system was experimental investigated in this study, with 15 mm thickness fresh carrot chips used. Furthermore, qualitatively and quantitatively comparisons and discussions on experimental results were conducted. A whole drying process were firstly divided into three stages by different water content ratios, preheating stage at 98–100%, fast drying stage at 20–98%, and later drying stage at 0–20%, respectively. For the inlet air temperature of drying chamber is fixed at 40 °C, material drying time for water content ratio reaching 20% could be effectively decreased as much as 42 min, or 15.0%, by the strategy of hot air bypassed. After the drying time shortened, the calculated energy consumption for compressor was also decreased from 4.27 kWh for AFR at 1.0 to 3.63 kWh for AFR at 0.6. Contributions of this study can guide low temperature material drying process. Clearly, system control optimization and energy saving were both expected.

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 130, 735-744 p.
Keyword [en]
Air flow ratio, Drying performance, Drying time, Experimental study, Heat pump drying system, Water content ratio, Air, Atmospheric temperature, Bypass ratio, Drying, Energy conservation, Energy utilization, Heat pump systems, Pumps, Temperature, Air flow, Heat pump drying, Air source heat pumps
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-37409DOI: 10.1016/j.applthermaleng.2017.11.068Scopus ID: 2-s2.0-85034638380OAI: oai:DiVA.org:mdh-37409DiVA: diva2:1163617
Available from: 2017-12-07 Created: 2017-12-07 Last updated: 2017-12-07Bibliographically approved

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Li, Hailong

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