Analysis on drying box exergy and variable air velocity drying of autumn rice

Authors

ZHAO Xihe, Guangdong Agricultural Machinery Research Institute, Guangzhou, Guangdong 510630, China; Food Science College of South China Agricultural University, Guangzhou, Guangdong 510630, China
LONG Chengshu, Guangdong Agricultural Machinery Research Institute, Guangzhou, Guangdong 510630, China; Food Science College of South China Agricultural University, Guangzhou, Guangdong 510630, China
ZHANG Jinjiang, Guangdong Agricultural Machinery Research Institute, Guangzhou, Guangdong 510630, China; Food Science College of South China Agricultural University, Guangzhou, Guangdong 510630, China
LIU Qinghua, Guangdong Agricultural Machinery Research Institute, Guangzhou, Guangdong 510630, China; Food Science College of South China Agricultural University, Guangzhou, Guangdong 510630, China
GONG Li, Guangdong Agricultural Machinery Research Institute, Guangzhou, Guangdong 510630, China; Food Science College of South China Agricultural University, Guangzhou, Guangdong 510630, China

Abstract

In order to solve the problem of temperature rise in heat pump drying rice in autumn. Two drying test scheme were been set, for the low temperature constant rate drying and variable wind speed drying. Both the total energy consumption and exergy analysis were been taken comparison of the drying process of rice. Experimental results show that the drying rate increases with wind speed and temperature go up in constant speed drying process. However, both the exergy efficiency and total energy consumption decrease with the increase of the wind speed. The total energy consumption of the variable wind speed drying is lower than that of the big constant wind speed experience groups. And the drying time is shorter than the small constant wind speed groups under the same temperature condition. The optimal parameters are obtained by experiment is that the first 7 hours the wind speed is 0.7 m/s, then 0.4 m/s. When the temperature is 45 ℃, the exergy efficiency is 44.05% and the temperature in 55 ℃ is 57.49%. It has a certain guiding significance for rice drying in southern china.

Publication Date

6-28-2016

First Page

95

Last Page

99

DOI

10.13652/j.issn.1003-5788.2016.06.022

Recommended Citation

Xihe, ZHAO; Chengshu, LONG; Jinjiang, ZHANG; Qinghua, LIU; and Li, GONG (2016) "Analysis on drying box exergy and variable air velocity drying of autumn rice," Food and Machinery: Vol. 32: Iss. 6, Article 22.
DOI: 10.13652/j.issn.1003-5788.2016.06.022
Available at: https://www.ifoodmm.cn/journal/vol32/iss6/22

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