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Registros recuperados: 13 | |
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Sven Nimmermark. |
In regions with a colder climate the use of heat energy for climatization of greenhouses can be significant. Beside outdoor temperatures and climate also transpiration affects the use of heat energy since heating and ventilation or dehumidification may be required in order to keep the humidity in the greenhouse below levels which may lead to plant diseases. A reliable model is a powerful tool to predict energy use for greenhouse cultivation. Thus, a mechanistic model including transpiration and energy use for dehumidification and hourly output data was developed from an older simpler model. To be reliable, modelled data must fit with real data. The aim of the present study is to compare measured and modelled use of heat energy. Thus, energy use for a... |
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Palavras-chave: Greenhouses; Energy; Measurements; Modelling. |
Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3100 |
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Nimmermark, Sven. |
In regions with a colder climate the use of heat energy for climatization of greenhouses can be significant. Beside outdoor temperatures and climate also transpiration affects the use of heat energy since heating and ventilation or dehumidification may be required in order to keep the humidity in the greenhouse below levels which may lead to plant diseases. A reliable model is a powerful tool to predict energy use for greenhouse cultivation. Thus, a mechanistic model including transpiration and energy use for dehumidification and hourly output data was developed from an older simpler model. To be reliable, modelled data must fit with real data. The aim of the present study is to compare measured and modelled use of heat energy. Thus, energy use for a... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Greenhouses; Energy; Measurements; Modelling. |
Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3100 |
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Ronoh, Erick K.. |
Solar radiation is the driving force for the surface energy balance in buildings such as greenhouses. The greenhouses are generally tilted towards the sun in order to maximize the solar irradiance on the surfaces. Precise computation of the solar radiation received on these surfaces assumes an important role in the energy simulation. It is practical to calculate the total solar irradiance on the tilted surfaces based on the solar global and diffuse radiation intensities on horizontal surfaces. In this work, a south-facing thermal box inclined at 26.5° from the horizontal was used for solar radiation measurements. Additionally, the recorded solar radiation data were retrieved for the study location and used to develop an empirical correlation. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar radiation; Greenhouses; Tilted surface; Diffuse fraction; Clearness index. |
Ano: 2017 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3903 |
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Registros recuperados: 13 | |
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