Performance analysis and economic evaluation of thermosyphon paddy bulk storage

Performance and economic analyses of a prototype paddy bulk storage with R22 thermosyphon for self-heat rejecting have been studied. The unit has a steel cylindrical bin with diameter of 1250 mm and length of 1500 mm that contains 1000 kg of paddy. The evaporation section of the thermosyphon embedde...

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Main Authors: Dussadee N., Kiatsiriroat T.
Format: Article
Language:English
Published: 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-0242657690&partnerID=40&md5=f6f98dcfef44827825dd93798669e4d6
http://cmuir.cmu.ac.th/handle/6653943832/1241
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spelling th-cmuir.6653943832-12412014-08-29T09:28:58Z Performance analysis and economic evaluation of thermosyphon paddy bulk storage Dussadee N. Kiatsiriroat T. Performance and economic analyses of a prototype paddy bulk storage with R22 thermosyphon for self-heat rejecting have been studied. The unit has a steel cylindrical bin with diameter of 1250 mm and length of 1500 mm that contains 1000 kg of paddy. The evaporation section of the thermosyphon embedded in the paddy bulk is a set of copper tubes with the total heat transfer area of 8.5 m2. The condenser section with the total area of 12.2 m 2 is exposed to the ambient air. The analyses have been compared with the unit having a conventional aeration. The experiment shows that there is a high potential for using thermosyphon to control the paddy bed temperature. It could be found that for the paddy with moisture content of 26.9% and 13.5% wet basis, the thermosyphon can maintain the paddy bed temperature at 37-38 °C and 28-29 °C, respectively compared with 62 °C and 31-32 °C for the unit without any control. Moreover very small temperature difference in the bed is also observed in the unit with thermosyphon. The paddy quality in term of head rice yield (38.06%), percentage of brown (72.7%) and white rice (60.14%) for the unit with thermosyphon is very close to those (40.16%, 72.37%, 60.43%) of the unit with aeration. The mathematical model developed could be used to predict the paddy bed temperature accurately and the evaporator area should not be less than 16 m2 for 1000 kg of paddy (Condenser area of 12.2 m2) at Chiang Mai, Thailand. The economic analysis indicates that the payback period of the storage with 16 m2 evaporator area is shorter and higher IRR obtained with the percent of annual fan operation. The payback is about 8 years when 20% of annual fan operation is taken. © 2003 Elsevier Ltd. All rights reserved. 2014-08-29T09:28:57Z 2014-08-29T09:28:57Z 2004 Article 13594311 10.1016/j.applthermaleng.2003.08.004 ATENF http://www.scopus.com/inward/record.url?eid=2-s2.0-0242657690&partnerID=40&md5=f6f98dcfef44827825dd93798669e4d6 http://cmuir.cmu.ac.th/handle/6653943832/1241 English
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
language English
description Performance and economic analyses of a prototype paddy bulk storage with R22 thermosyphon for self-heat rejecting have been studied. The unit has a steel cylindrical bin with diameter of 1250 mm and length of 1500 mm that contains 1000 kg of paddy. The evaporation section of the thermosyphon embedded in the paddy bulk is a set of copper tubes with the total heat transfer area of 8.5 m2. The condenser section with the total area of 12.2 m 2 is exposed to the ambient air. The analyses have been compared with the unit having a conventional aeration. The experiment shows that there is a high potential for using thermosyphon to control the paddy bed temperature. It could be found that for the paddy with moisture content of 26.9% and 13.5% wet basis, the thermosyphon can maintain the paddy bed temperature at 37-38 °C and 28-29 °C, respectively compared with 62 °C and 31-32 °C for the unit without any control. Moreover very small temperature difference in the bed is also observed in the unit with thermosyphon. The paddy quality in term of head rice yield (38.06%), percentage of brown (72.7%) and white rice (60.14%) for the unit with thermosyphon is very close to those (40.16%, 72.37%, 60.43%) of the unit with aeration. The mathematical model developed could be used to predict the paddy bed temperature accurately and the evaporator area should not be less than 16 m2 for 1000 kg of paddy (Condenser area of 12.2 m2) at Chiang Mai, Thailand. The economic analysis indicates that the payback period of the storage with 16 m2 evaporator area is shorter and higher IRR obtained with the percent of annual fan operation. The payback is about 8 years when 20% of annual fan operation is taken. © 2003 Elsevier Ltd. All rights reserved.
format Article
author Dussadee N.
Kiatsiriroat T.
spellingShingle Dussadee N.
Kiatsiriroat T.
Performance analysis and economic evaluation of thermosyphon paddy bulk storage
author_facet Dussadee N.
Kiatsiriroat T.
author_sort Dussadee N.
title Performance analysis and economic evaluation of thermosyphon paddy bulk storage
title_short Performance analysis and economic evaluation of thermosyphon paddy bulk storage
title_full Performance analysis and economic evaluation of thermosyphon paddy bulk storage
title_fullStr Performance analysis and economic evaluation of thermosyphon paddy bulk storage
title_full_unstemmed Performance analysis and economic evaluation of thermosyphon paddy bulk storage
title_sort performance analysis and economic evaluation of thermosyphon paddy bulk storage
publishDate 2014
url http://www.scopus.com/inward/record.url?eid=2-s2.0-0242657690&partnerID=40&md5=f6f98dcfef44827825dd93798669e4d6
http://cmuir.cmu.ac.th/handle/6653943832/1241
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