TY - GEN
T1 - Heat transfer in three-dimensional single-span greenhouses containing a roof ventilator
AU - Kruger, Sunita
AU - Pretorius, Leon
N1 - Publisher Copyright:
© 2017 ASME.
PY - 2017
Y1 - 2017
N2 - Greenhouses are used worldwide to grow various types of plants in climates and seasons not usually adequately suited for optimum growth. The microclimate inside greenhouses is of major importance as it directly affects the quantity and quality of crop production. Ventilation is a vital mechanism for maintaining an acceptable indoor climate for optimum plant production. A three-dimensional CFD model of a single span greenhouse with roof ventilators is presented. CFD results from a twodimensional version of the model are compared with appropriate previous experimental results. The role of the Standard versus Low-Reynolds number k-epsilon turbulence model is emphasized. The addition of a ventilator to the roof of a singlespan greenhouse was found to have an influence on the heat transfer inside the cavity. Various configurations of threedimensional CFD models of the greenhouse with different ventilator opening sizes for zero and 45 degrees roof angle were investigated. Additional Nusselt-Rayleigh number relationships for specific Rayleigh number ranges were deduced, and can be useful for a greenhouse designer.
AB - Greenhouses are used worldwide to grow various types of plants in climates and seasons not usually adequately suited for optimum growth. The microclimate inside greenhouses is of major importance as it directly affects the quantity and quality of crop production. Ventilation is a vital mechanism for maintaining an acceptable indoor climate for optimum plant production. A three-dimensional CFD model of a single span greenhouse with roof ventilators is presented. CFD results from a twodimensional version of the model are compared with appropriate previous experimental results. The role of the Standard versus Low-Reynolds number k-epsilon turbulence model is emphasized. The addition of a ventilator to the roof of a singlespan greenhouse was found to have an influence on the heat transfer inside the cavity. Various configurations of threedimensional CFD models of the greenhouse with different ventilator opening sizes for zero and 45 degrees roof angle were investigated. Additional Nusselt-Rayleigh number relationships for specific Rayleigh number ranges were deduced, and can be useful for a greenhouse designer.
UR - http://www.scopus.com/inward/record.url?scp=85040967240&partnerID=8YFLogxK
U2 - 10.1115/IMECE2017-71207
DO - 10.1115/IMECE2017-71207
M3 - Conference contribution
AN - SCOPUS:85040967240
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
BT - Heat Transfer and Thermal Engineering
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2017 International Mechanical Engineering Congress and Exposition, IMECE 2017
Y2 - 3 November 2017 through 9 November 2017
ER -