Resumo

FLORES-VELAZQUEZ, Jorge; VILLARREAL-GUERRERO, Federico; ROJANO-AGUILAR, Abraham  e  SCHDMITH, Uwe. CFD to analyze energy exchange by convection in a closed greenhouse with a pipe heating system. Acta univ [online]. 2019, vol.29, e2112.  Epub 11-Set-2020. ISSN 2007-9621.  https://doi.org/10.15174/au.2019.2112.

In some locations with harsh winters, the heat stored in the soil may not be enough to heating a greenhouse, and so artificial heat must be supplied. The objective of this study was to evaluate a numerical model under local weather conditions, in Humboldt University of Berlin, Germany, during winter 2011 to analyze the air dynamics generated through a tube pipe heating system convection in a closed greenhouse, for it to be applicable in producing cold regions in Mexico. Results showed that 100 W m-2 of heat released from the soil kept the environment within acceptable ranges for plant growth from noon to evening. However, the energy lost by long-wave radiation during the night lowered the air temperature to minimal basal temperature. Heat from the pipes placed underneath the crop promoted air movement by convection, producing a uniform distribution of temperature and humidity within the plant canopy.

Palavras-chave : Greenhouse climate; Navier-Stokes equations; modeling; temperature gradient; velocity vectors.

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