Thermography and Sonic Anemometry to Analyze Air Heaters in Mediterranean Greenhouses
The present work has developed a methodology based on thermography and sonic anemometry for studying the microclimate in Mediterranean greenhouses equipped with air heaters and polyethylene distribution ducts to distribute the warm air. Sonic anemometry allows us to identify the airflow pattern gene...
| Main Authors: | , , , |
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| Format: | info:eu-repo/semantics/article |
| Language: | English |
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MDPI
2020
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10835/7330 |
| _version_ | 1789406347805065216 |
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| author | López Martínez, Alejandro Valera Martínez, Diego Luis Molina Aiz, Francisco Domingo Peña Fernández, Ana Araceli |
| author_facet | López Martínez, Alejandro Valera Martínez, Diego Luis Molina Aiz, Francisco Domingo Peña Fernández, Ana Araceli |
| author_sort | López Martínez, Alejandro |
| collection | DSpace |
| description | The present work has developed a methodology based on thermography and sonic anemometry for studying the microclimate in Mediterranean greenhouses equipped with air heaters and polyethylene distribution ducts to distribute the warm air. Sonic anemometry allows us to identify the airflow pattern generated by the heaters and to analyze the temperature distribution inside the greenhouse, while thermography provides accurate crop temperature data. Air distribution by means of perforated polyethylene ducts at ground level, widely used in Mediterranean-type greenhouses, can generate heterogeneous temperature distributions inside the greenhouse when the system is not correctly designed. The system analyzed in this work used a polyethylene duct with a row of hot air outlet holes (all of equal diameter) that expel warm air toward the ground to avoid plant damage. We have observed that this design (the most widely used in Almería’s greenhouses) produces stagnation of hot air in the highest part of the structure, reducing the heating of the crop zone. Using 88 kW heating power (146.7 W∙m−2) the temperature inside the greenhouse is maintained 7.2 to 11.2 °C above the outside temperature. The crop temperature (17.6 to 19.9 °C) was maintained above the minimum recommended value of 10 °C. |
| format | info:eu-repo/semantics/article |
| id | oai:repositorio.ual.es:10835-7330 |
| institution | Universidad de Cuenca |
| language | English |
| publishDate | 2020 |
| publisher | MDPI |
| record_format | dspace |
| spelling | oai:repositorio.ual.es:10835-73302023-04-12T19:29:04Z Thermography and Sonic Anemometry to Analyze Air Heaters in Mediterranean Greenhouses López Martínez, Alejandro Valera Martínez, Diego Luis Molina Aiz, Francisco Domingo Peña Fernández, Ana Araceli sonic anemometry greenhouse air heaters The present work has developed a methodology based on thermography and sonic anemometry for studying the microclimate in Mediterranean greenhouses equipped with air heaters and polyethylene distribution ducts to distribute the warm air. Sonic anemometry allows us to identify the airflow pattern generated by the heaters and to analyze the temperature distribution inside the greenhouse, while thermography provides accurate crop temperature data. Air distribution by means of perforated polyethylene ducts at ground level, widely used in Mediterranean-type greenhouses, can generate heterogeneous temperature distributions inside the greenhouse when the system is not correctly designed. The system analyzed in this work used a polyethylene duct with a row of hot air outlet holes (all of equal diameter) that expel warm air toward the ground to avoid plant damage. We have observed that this design (the most widely used in Almería’s greenhouses) produces stagnation of hot air in the highest part of the structure, reducing the heating of the crop zone. Using 88 kW heating power (146.7 W∙m−2) the temperature inside the greenhouse is maintained 7.2 to 11.2 °C above the outside temperature. The crop temperature (17.6 to 19.9 °C) was maintained above the minimum recommended value of 10 °C. 2020-01-16T08:35:48Z 2020-01-16T08:35:48Z 2012-10-16 info:eu-repo/semantics/article 1424-8220 http://hdl.handle.net/10835/7330 en https://www.mdpi.com/1424-8220/12/10/13852 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess MDPI |
| spellingShingle | sonic anemometry greenhouse air heaters López Martínez, Alejandro Valera Martínez, Diego Luis Molina Aiz, Francisco Domingo Peña Fernández, Ana Araceli Thermography and Sonic Anemometry to Analyze Air Heaters in Mediterranean Greenhouses |
| title | Thermography and Sonic Anemometry to Analyze Air Heaters in Mediterranean Greenhouses |
| title_full | Thermography and Sonic Anemometry to Analyze Air Heaters in Mediterranean Greenhouses |
| title_fullStr | Thermography and Sonic Anemometry to Analyze Air Heaters in Mediterranean Greenhouses |
| title_full_unstemmed | Thermography and Sonic Anemometry to Analyze Air Heaters in Mediterranean Greenhouses |
| title_short | Thermography and Sonic Anemometry to Analyze Air Heaters in Mediterranean Greenhouses |
| title_sort | thermography and sonic anemometry to analyze air heaters in mediterranean greenhouses |
| topic | sonic anemometry greenhouse air heaters |
| url | http://hdl.handle.net/10835/7330 |
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