Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump
An even span solar greenhouse dryer was built and applied to dry Java tea (Orthosiphon aristatus) and Sabah snake grass (Clinacanthus nutans Lindau). Findings showed that the solar greenhouse dryer performs satisfactorily during clear weather except at nighttime and rainy day due to product rehydrat...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Inc.
2017
|
| Online Access: | http://psasir.upm.edu.my/id/eprint/61545/1/Effect%20of%20ambient%20conditions%20on%20drying%20of%20herbs%20in%20solar%20greenhouse%20dryer%20with%20integrated%20heat%20pump.pdf |
| _version_ | 1825932353315274752 |
|---|---|
| author | Tham, Thing Chai Ng, Mei Xiang Gan, Shu Hui Chua, Lee Suan Aziz, Ramlan Abdullah, Luqman Chuah Hii, Ching Lik Ong, Sze Pheng Chin, Nyuk Ling Law, Chung Lim |
| author_facet | Tham, Thing Chai Ng, Mei Xiang Gan, Shu Hui Chua, Lee Suan Aziz, Ramlan Abdullah, Luqman Chuah Hii, Ching Lik Ong, Sze Pheng Chin, Nyuk Ling Law, Chung Lim |
| author_sort | Tham, Thing Chai |
| collection | UPM |
| description | An even span solar greenhouse dryer was built and applied to dry Java tea (Orthosiphon aristatus) and Sabah snake grass (Clinacanthus nutans Lindau). Findings showed that the solar greenhouse dryer performs satisfactorily during clear weather except at nighttime and rainy day due to product rehydration which is heavily influenced by high relative humidity from ambient air. Integrating of heat pump into the solar greenhouse dryer has successfully reduced the room relative humidity by 10–15%. Also, heat pump has mitigated the product rehydration issue by maintaining room relative humidity at maximum of 65% throughout the drying period. The drying rate of Java tea was improved three to fourfold, i.e., from 0.004–0.008 to 0.018–0.025 g H2O/g DM min, whereas 10% of drying time was saved for both Java tea leaf and Sabah snake grass leaf with the assistance of heat pump system. Meanwhile, the supply of dry air from the heat pump system with a magnitude of 0.25–0.50 m/s helps in enhancing the drying rate of the herbs as well as minimizing the nonuniformity of drying temperature and relative humidity inside the solar greenhouse dryer. |
| first_indexed | 2024-03-06T09:40:43Z |
| format | Article |
| id | upm.eprints-61545 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:40:43Z |
| publishDate | 2017 |
| publisher | Taylor & Francis Inc. |
| record_format | dspace |
| spelling | upm.eprints-615452022-05-25T02:54:10Z http://psasir.upm.edu.my/id/eprint/61545/ Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump Tham, Thing Chai Ng, Mei Xiang Gan, Shu Hui Chua, Lee Suan Aziz, Ramlan Abdullah, Luqman Chuah Hii, Ching Lik Ong, Sze Pheng Chin, Nyuk Ling Law, Chung Lim An even span solar greenhouse dryer was built and applied to dry Java tea (Orthosiphon aristatus) and Sabah snake grass (Clinacanthus nutans Lindau). Findings showed that the solar greenhouse dryer performs satisfactorily during clear weather except at nighttime and rainy day due to product rehydration which is heavily influenced by high relative humidity from ambient air. Integrating of heat pump into the solar greenhouse dryer has successfully reduced the room relative humidity by 10–15%. Also, heat pump has mitigated the product rehydration issue by maintaining room relative humidity at maximum of 65% throughout the drying period. The drying rate of Java tea was improved three to fourfold, i.e., from 0.004–0.008 to 0.018–0.025 g H2O/g DM min, whereas 10% of drying time was saved for both Java tea leaf and Sabah snake grass leaf with the assistance of heat pump system. Meanwhile, the supply of dry air from the heat pump system with a magnitude of 0.25–0.50 m/s helps in enhancing the drying rate of the herbs as well as minimizing the nonuniformity of drying temperature and relative humidity inside the solar greenhouse dryer. Taylor & Francis Inc. 2017 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/61545/1/Effect%20of%20ambient%20conditions%20on%20drying%20of%20herbs%20in%20solar%20greenhouse%20dryer%20with%20integrated%20heat%20pump.pdf Tham, Thing Chai and Ng, Mei Xiang and Gan, Shu Hui and Chua, Lee Suan and Aziz, Ramlan and Abdullah, Luqman Chuah and Hii, Ching Lik and Ong, Sze Pheng and Chin, Nyuk Ling and Law, Chung Lim (2017) Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump. Drying Technology, 35 (14). 1721 - 1732. ISSN 0737-3937; ESSN: 1532-2300 https://www.tandfonline.com/doi/abs/10.1080/07373937.2016.1271984 10.1080/07373937.2016.1271984 |
| spellingShingle | Tham, Thing Chai Ng, Mei Xiang Gan, Shu Hui Chua, Lee Suan Aziz, Ramlan Abdullah, Luqman Chuah Hii, Ching Lik Ong, Sze Pheng Chin, Nyuk Ling Law, Chung Lim Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump |
| title | Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump |
| title_full | Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump |
| title_fullStr | Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump |
| title_full_unstemmed | Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump |
| title_short | Effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump |
| title_sort | effect of ambient conditions on drying of herbs in solar greenhouse dryer with integrated heat pump |
| url | http://psasir.upm.edu.my/id/eprint/61545/1/Effect%20of%20ambient%20conditions%20on%20drying%20of%20herbs%20in%20solar%20greenhouse%20dryer%20with%20integrated%20heat%20pump.pdf |
| work_keys_str_mv | AT thamthingchai effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT ngmeixiang effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT ganshuhui effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT chualeesuan effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT azizramlan effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT abdullahluqmanchuah effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT hiichinglik effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT ongszepheng effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT chinnyukling effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump AT lawchunglim effectofambientconditionsondryingofherbsinsolargreenhousedryerwithintegratedheatpump |