Improving exergetic performance parameters of a rotating-tray air dryer via a simple heat exchanger

Ghasemkhani, Hamid, Keyhani, Alireza, Aghbashlo, Mortaza, Rafiee, Shahin and Mujumdar, Arun S. (2016) Improving exergetic performance parameters of a rotating-tray air dryer via a simple heat exchanger. Applied Thermal Engineering, 94 13-23. doi:10.1016/j.applthermaleng.2015.10.114

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Author Ghasemkhani, Hamid
Keyhani, Alireza
Aghbashlo, Mortaza
Rafiee, Shahin
Mujumdar, Arun S.
Title Improving exergetic performance parameters of a rotating-tray air dryer via a simple heat exchanger
Journal name Applied Thermal Engineering   Check publisher's open access policy
ISSN 1359-4311
1873-5606
Publication date 2016-02-05
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.applthermaleng.2015.10.114
Open Access Status File (Author Post-print)
Volume 94
Start page 13
End page 23
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Formatted abstract
In this study, exergy analysis was applied for a rotating-tray dryer equipped with a cross-flow plate heat exchanger during drying of apple slices. Three drying air temperatures and tray rotation speeds in the range of 50–80 °C and 0–12 rpm, respectively, were employed. Two drying air velocities in the range of 1–2 m/s were adjusted for each drying temperature and rotation speed with and without application of the heat exchanger. The experiments were conducted to assess the effects of the experimental variables on the exergetic performance parameters of the dryer. Also, the effect of drying conditions on the quality of dried apple slices was assessed by determining rehydration ratio, apparent density, shrinkage, and surface color. In general, the exergetic performance parameters of the dryer depended profoundly on the drying air temperature and velocity. Interestingly, the exergetic efficiency of drying process was significantly improved from a minimum value of 23.0% to a maximum value of 96.1% by using the heat exchanger. Furthermore, the incorporation of heat exchanger did not negatively affect the quality of dried product. Therefore, the strategy presented herein could be a promising approach for waste energy recovery in drying without any unfavorable change in the quality of dried product.
Keyword Air to air heat exchanger
Drying
Exergy efficiency
Quality
Rotating tray air dryer
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
 
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