Performance Analysis of a Greenhouse Fan-Pad Cooling System: Gradients of Horizontal Temperature and Relative Humidity
An experimental study was conducted to determine the performance parameters of system, as well as gradients of temperature and humidity along greenhouse when opening fan-ped cooling system. Measurements related with greenhouse environment were carried out by using seven sensors for different locatio...
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| Language: | English |
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Ankara University
2014-12-01
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| Series: | Journal of Agricultural Sciences |
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| Online Access: | https://dergipark.org.tr/tr/download/article-file/21152 |
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| author | Mehmet Ali Dayıoğlu Hasan Hüseyin Silleli |
| author_facet | Mehmet Ali Dayıoğlu Hasan Hüseyin Silleli |
| author_sort | Mehmet Ali Dayıoğlu |
| collection | DOAJ |
| description | An experimental study was conducted to determine the performance parameters of system, as well as gradients of temperature and humidity along greenhouse when opening fan-ped cooling system. Measurements related with greenhouse environment were carried out by using seven sensors for different locations, as well as portable instruments. For this purpose, the five digital temperature and humidity sensors and two pyranometers were used during experiments. Among them, two were located outside greenhouse for external measurements. The rest one pyranometer above the crop canopy, four temperature and humidity sensors were mounted within the crop canopy along the greenhouse. Four sensors were placed according to positions defined between pad and fan. According to the experiment results, the non-uniform temperature changes, but approximately uniform humidity changes due to the crop transpiration were observed along greenhouse from pad panels to exhaust fans.When the cooling system closed, hourly mean temperature and relative humidity from pad to fan inside greenhouse changed between 30–33°C and 30–47%, respectively, at outside climate conditions of 32°C and 25%. After providing stabile cooling by opening fan-pad system, hourly mean temperature and relative humidity along greenhouse from pad to fan ranged between 20 – 27°C, and 50 – 68%, respectively. The air temperature entering to greenhouse with air velocity of 0.8–0.9 ms-1 through pad was approximately 12–13ºC lower than the outside air temperature. The air temperature from pad to fan increased approximately by 7 ºC.The method of psychrometric calculations was employed to determine the cooling efficiency of fan-pad system. According to the calculation result, the average of air temperatures inside greenhouse was 24.5 ºC after achieving stable cooling for outside air temperature of 31.4 ºC. The hourly mean cooling effect and cooling efficiency calculated for fan-pad system were determined to be 6.96ºC and 76.8%, respectively. |
| format | Article |
| id | doaj-art-be652cfcf97b410cb0de71bc44e7e90b |
| institution | DOAJ |
| issn | 1300-7580 2148-9297 |
| language | English |
| publishDate | 2014-12-01 |
| publisher | Ankara University |
| record_format | Article |
| series | Journal of Agricultural Sciences |
| spelling | doaj-art-be652cfcf97b410cb0de71bc44e7e90b2025-08-20T03:05:09ZengAnkara UniversityJournal of Agricultural Sciences1300-75802148-92972014-12-0121113214310.15832/tbd.2572145Performance Analysis of a Greenhouse Fan-Pad Cooling System: Gradients of Horizontal Temperature and Relative HumidityMehmet Ali DayıoğluHasan Hüseyin SilleliAn experimental study was conducted to determine the performance parameters of system, as well as gradients of temperature and humidity along greenhouse when opening fan-ped cooling system. Measurements related with greenhouse environment were carried out by using seven sensors for different locations, as well as portable instruments. For this purpose, the five digital temperature and humidity sensors and two pyranometers were used during experiments. Among them, two were located outside greenhouse for external measurements. The rest one pyranometer above the crop canopy, four temperature and humidity sensors were mounted within the crop canopy along the greenhouse. Four sensors were placed according to positions defined between pad and fan. According to the experiment results, the non-uniform temperature changes, but approximately uniform humidity changes due to the crop transpiration were observed along greenhouse from pad panels to exhaust fans.When the cooling system closed, hourly mean temperature and relative humidity from pad to fan inside greenhouse changed between 30–33°C and 30–47%, respectively, at outside climate conditions of 32°C and 25%. After providing stabile cooling by opening fan-pad system, hourly mean temperature and relative humidity along greenhouse from pad to fan ranged between 20 – 27°C, and 50 – 68%, respectively. The air temperature entering to greenhouse with air velocity of 0.8–0.9 ms-1 through pad was approximately 12–13ºC lower than the outside air temperature. The air temperature from pad to fan increased approximately by 7 ºC.The method of psychrometric calculations was employed to determine the cooling efficiency of fan-pad system. According to the calculation result, the average of air temperatures inside greenhouse was 24.5 ºC after achieving stable cooling for outside air temperature of 31.4 ºC. The hourly mean cooling effect and cooling efficiency calculated for fan-pad system were determined to be 6.96ºC and 76.8%, respectively.https://dergipark.org.tr/tr/download/article-file/21152greenhouse; fan-pad cooling system; temperature and relative humidity; psychrometric calculation; cooling efficiencysoğutma etkinliği fan-pad soğutma sistemi sera psikrometrik hesaplama sıcaklık ve bağıl nem |
| spellingShingle | Mehmet Ali Dayıoğlu Hasan Hüseyin Silleli Performance Analysis of a Greenhouse Fan-Pad Cooling System: Gradients of Horizontal Temperature and Relative Humidity Journal of Agricultural Sciences greenhouse; fan-pad cooling system; temperature and relative humidity; psychrometric calculation; cooling efficiency soğutma etkinliği fan-pad soğutma sistemi sera psikrometrik hesaplama sıcaklık ve bağıl nem |
| title | Performance Analysis of a Greenhouse Fan-Pad Cooling System: Gradients of Horizontal Temperature and Relative Humidity |
| title_full | Performance Analysis of a Greenhouse Fan-Pad Cooling System: Gradients of Horizontal Temperature and Relative Humidity |
| title_fullStr | Performance Analysis of a Greenhouse Fan-Pad Cooling System: Gradients of Horizontal Temperature and Relative Humidity |
| title_full_unstemmed | Performance Analysis of a Greenhouse Fan-Pad Cooling System: Gradients of Horizontal Temperature and Relative Humidity |
| title_short | Performance Analysis of a Greenhouse Fan-Pad Cooling System: Gradients of Horizontal Temperature and Relative Humidity |
| title_sort | performance analysis of a greenhouse fan pad cooling system gradients of horizontal temperature and relative humidity |
| topic | greenhouse; fan-pad cooling system; temperature and relative humidity; psychrometric calculation; cooling efficiency soğutma etkinliği fan-pad soğutma sistemi sera psikrometrik hesaplama sıcaklık ve bağıl nem |
| url | https://dergipark.org.tr/tr/download/article-file/21152 |
| work_keys_str_mv | AT mehmetalidayıoglu performanceanalysisofagreenhousefanpadcoolingsystemgradientsofhorizontaltemperatureandrelativehumidity AT hasanhuseyinsilleli performanceanalysisofagreenhousefanpadcoolingsystemgradientsofhorizontaltemperatureandrelativehumidity |