Articles
Development and validation of a dynamic climate model in a semiclosed greenhouse
Article number
1182_13
Pages
111 – 118
Language
English
Abstract
Some of the advantages of using closed and semiclosed greenhouses are the energy and water savings as well as the increase in efficiency in CO2 enrichment.
However, the building costs are still high for most of the growers.
A simulation model of the greenhouse environment is an unexpensive and accurate process for studying the inside conditions response without the cost of building a greenhouse.
Therefore, the purpose of this study was to develop a dynamic physical model for prediction of air temperature and humidity in a Semiclosed Greenhouse.
The information was provided by the Institute of Horticulture at Humboldt University of Berlin.
The 307.2 m2 semiclosed greenhouse with tomato crop is equipped with hydroponic and fogging systems, double glazing, double heat shield, heating system in the floor, below banks and between plants.
There are heat exchangers below the roof, for water vapor condensation inside the greenhouse.
Also, it is equipped with cooling tower, heat pump, hydraulic switches, plus a 300 m3 water tank for storing energy.
In addition, the facility have a weather station for measuring the external weather conditions and a phytomonitoring system, wherein the main physiological variables are recorded.
Data every 5 min from January to September 2012 were used.
The dynamic energy and water balance model includes: the effects of solar radiation, heating, cooling, partial ventilation, fogging system, transpiration and condensation.
After calibration, the model describes the dynamics of the internal temperature and absolute humidity in the semi-closed greenhouse and can be used for management strategies to improve the environmental conditions inside the greenhouse.
However, the building costs are still high for most of the growers.
A simulation model of the greenhouse environment is an unexpensive and accurate process for studying the inside conditions response without the cost of building a greenhouse.
Therefore, the purpose of this study was to develop a dynamic physical model for prediction of air temperature and humidity in a Semiclosed Greenhouse.
The information was provided by the Institute of Horticulture at Humboldt University of Berlin.
The 307.2 m2 semiclosed greenhouse with tomato crop is equipped with hydroponic and fogging systems, double glazing, double heat shield, heating system in the floor, below banks and between plants.
There are heat exchangers below the roof, for water vapor condensation inside the greenhouse.
Also, it is equipped with cooling tower, heat pump, hydraulic switches, plus a 300 m3 water tank for storing energy.
In addition, the facility have a weather station for measuring the external weather conditions and a phytomonitoring system, wherein the main physiological variables are recorded.
Data every 5 min from January to September 2012 were used.
The dynamic energy and water balance model includes: the effects of solar radiation, heating, cooling, partial ventilation, fogging system, transpiration and condensation.
After calibration, the model describes the dynamics of the internal temperature and absolute humidity in the semi-closed greenhouse and can be used for management strategies to improve the environmental conditions inside the greenhouse.
Authors
R. Salazar-Moreno, I.L. López-Cruz, L. Miranda, U. Schmidt, E. Fitz-Rodríguez, A. Rojano-Aguilar
Keywords
transpiration, condensation, ventilation, tomato crop
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