The Effect of Vegetation Coverage and Greenhouse Area on the Performance of an Earth-to-Air Heat Exchanger in Cooling Mode of Greenhouse
The underground temperature at a depth of about three to four meters is almost constant during the year. As a result in summer the underground is cooler than the ambient temperature. This potential is considered for greenhouse cooling by using an Earth-to-Air Heat Exchanger (EAHE). In this research...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Ferdowsi University of Mashhad
2013-02-01
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| Series: | Journal of Agricultural Machinery |
| Subjects: | |
| Online Access: | https://jame.um.ac.ir/index.php/jame/article/view/19709 |
| _version_ | 1818665008790241280 |
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| author | M Mohammadi Mogharreb M.H Abbaspour-Fard M Goldani B Emadi |
| author_facet | M Mohammadi Mogharreb M.H Abbaspour-Fard M Goldani B Emadi |
| author_sort | M Mohammadi Mogharreb |
| collection | DOAJ |
| description | The underground temperature at a depth of about three to four meters is almost constant during the year. As a result in summer the underground is cooler than the ambient temperature. This potential is considered for greenhouse cooling by using an Earth-to-Air Heat Exchanger (EAHE). In this research the effects of two parameters were investigated: a) the area of greenhouse in three levels
of 9, 18, 27 m2 and b) the percent of vegetation coverage inside the greenhouse in three levels of 0%, 50%, 100% on the performance of EAHE. The experimental design was factorial experiment in a randomized complete block design. The parameters of greenhouse’s inside temperature, thermal energy exchange and coefficient of performance (COP) were considered in cooling mode. As one of the remarkable results it was observed that the closed loop utilization of the system was infeasible in cooling mode. This was mainly due to the occurrence of vapor distillation inside the underground pipes and hence the blockages of the air flow. Also the effect of area and the percent of vegetation coverage were significant on the performance of EAHE. The highest average temperature difference between the temperature of testimonial greenhouse and the temperature of greenhouse was observed in treatment of 100% vegetation coverage and 9 m2 floor area which was measured as 9.6°C. The least average temperature difference in the treatment without vegetation coverage and 27 m2 floor area was measured as 5.2 °C. Considering thermal energy exchange in cooling greenhouse with open loop, the best treatment determined for EAHE in this research was the one with 9 m2 floor area and 100% of vegetation coverage. |
| first_indexed | 2024-12-17T05:41:49Z |
| format | Article |
| id | doaj.art-56b3c88891594daabe498c1412a87023 |
| institution | Directory Open Access Journal |
| issn | 2228-6829 2423-3943 |
| language | English |
| last_indexed | 2024-12-17T05:41:49Z |
| publishDate | 2013-02-01 |
| publisher | Ferdowsi University of Mashhad |
| record_format | Article |
| series | Journal of Agricultural Machinery |
| spelling | doaj.art-56b3c88891594daabe498c1412a870232022-12-21T22:01:25ZengFerdowsi University of MashhadJournal of Agricultural Machinery2228-68292423-39432013-02-0131162310.22067/jam.v3i1.197095746The Effect of Vegetation Coverage and Greenhouse Area on the Performance of an Earth-to-Air Heat Exchanger in Cooling Mode of GreenhouseM Mohammadi MogharrebM.H Abbaspour-FardM GoldaniB EmadiThe underground temperature at a depth of about three to four meters is almost constant during the year. As a result in summer the underground is cooler than the ambient temperature. This potential is considered for greenhouse cooling by using an Earth-to-Air Heat Exchanger (EAHE). In this research the effects of two parameters were investigated: a) the area of greenhouse in three levels of 9, 18, 27 m2 and b) the percent of vegetation coverage inside the greenhouse in three levels of 0%, 50%, 100% on the performance of EAHE. The experimental design was factorial experiment in a randomized complete block design. The parameters of greenhouse’s inside temperature, thermal energy exchange and coefficient of performance (COP) were considered in cooling mode. As one of the remarkable results it was observed that the closed loop utilization of the system was infeasible in cooling mode. This was mainly due to the occurrence of vapor distillation inside the underground pipes and hence the blockages of the air flow. Also the effect of area and the percent of vegetation coverage were significant on the performance of EAHE. The highest average temperature difference between the temperature of testimonial greenhouse and the temperature of greenhouse was observed in treatment of 100% vegetation coverage and 9 m2 floor area which was measured as 9.6°C. The least average temperature difference in the treatment without vegetation coverage and 27 m2 floor area was measured as 5.2 °C. Considering thermal energy exchange in cooling greenhouse with open loop, the best treatment determined for EAHE in this research was the one with 9 m2 floor area and 100% of vegetation coverage.https://jame.um.ac.ir/index.php/jame/article/view/19709Temperature differenceEnergy exchangeCoolingEarth-to-Air GreenhouseHeating |
| spellingShingle | M Mohammadi Mogharreb M.H Abbaspour-Fard M Goldani B Emadi The Effect of Vegetation Coverage and Greenhouse Area on the Performance of an Earth-to-Air Heat Exchanger in Cooling Mode of Greenhouse Journal of Agricultural Machinery Temperature difference Energy exchange Cooling Earth-to-Air Greenhouse Heating |
| title | The Effect of Vegetation Coverage and Greenhouse Area on the Performance of an Earth-to-Air Heat Exchanger in Cooling Mode of Greenhouse |
| title_full | The Effect of Vegetation Coverage and Greenhouse Area on the Performance of an Earth-to-Air Heat Exchanger in Cooling Mode of Greenhouse |
| title_fullStr | The Effect of Vegetation Coverage and Greenhouse Area on the Performance of an Earth-to-Air Heat Exchanger in Cooling Mode of Greenhouse |
| title_full_unstemmed | The Effect of Vegetation Coverage and Greenhouse Area on the Performance of an Earth-to-Air Heat Exchanger in Cooling Mode of Greenhouse |
| title_short | The Effect of Vegetation Coverage and Greenhouse Area on the Performance of an Earth-to-Air Heat Exchanger in Cooling Mode of Greenhouse |
| title_sort | effect of vegetation coverage and greenhouse area on the performance of an earth to air heat exchanger in cooling mode of greenhouse |
| topic | Temperature difference Energy exchange Cooling Earth-to-Air Greenhouse Heating |
| url | https://jame.um.ac.ir/index.php/jame/article/view/19709 |
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