Journal of Food, Agriculture and Environment

The estimation model of inside temperature of lean-to type solar greenhouses with polycarbonate sheeting in summer

Author(s):

Lihui Wang ¹*, Weiye Zhou ², Jia Dong ², Yong Zhang ²

Recieved Date: 2014-02-15, Accepted Date: 2014-04-20

Abstract:

To provide the users warning for cooling of solar greenhouses without inside weather stations in summer, there is a need to establish the inside temperature estimation model and develop the meteorological indicators of cooling for precision micro-climate management. Based on the experiment of cucumbers in solar greenhouses with polycarbonate (PC) sheeting in summer of 2009 and 2011, the transmittance change of total solar radiation was analysed. The change trends of transmittance in the whole day and before cooling were similar, however, because of the aged deterioration of PC sheeting, the transmittance of solar greenhouse cover dropped to 0.21 from 0.34. According to the principle of irradiation and energy balance between inside and outside greenhouse, the inside temperature estimation model was established using the outside meteorological data and the parameters of solar greenhouses, and then the model was evaluated by the temperature monitoring data with the interval of 5 min in August 2009 and 2011. The results showed that the RMSD was 1.66 and 1.15, respectively. Based on the temperature requirement of solar greenhouse cucumber and the cooling equipments, the meteorological indicators were developed for cooling in summer of solar greenhouses. The studies could provide decision support for cooling in summer of solar greenhouses, and supply the scientific basis for meteorological operational service system in protected agriculture.

Keywords:

Lean-to type greenhouses, simulation, cooling, ventilation, meteorological indicators, cucumber, inside temperature estimation

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Agriculture
Pages: 566-569

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