Temperature Profile Study of  Selected Natural Ventilated Greenhouses and Development of Temperature Prediction Models

Dr. P. M. Chauhan; V. P. Joshi; Dr. R. M. Satasiya; Dr. D. K. Antala

Volume : V, Issue : III, March - 2016

Temperature Profile Study of Selected Natural Ventilated Greenhouses and Development of Temperature Prediction Models

Dr. P. M. Chauhan, V. P. Joshi, Dr. R. M. Satasiya, Dr. D. K. Antala

Abstract :

 In India because of the least expensive cooling method of greenhouse, natural ventilated types of greenhouses are considered to be the most acceptable structures for growing of vegetable and flower crops. In natural ventilated greenhouse, the inside air temperature is affected by its geometrical dimensions, span, orientation, ventilation rate etc. In the present study, efforts have been made to study the diurnal variation of inside air temperature during January to April months for three different types of natural ventilated greenhouses constructed at Junagadh Agricultural University campus From the study it was found that for Type-I, Type-II and Type-III greenhouses, inside air temperature was varied from 13.520C to 35.130C, 11.540C to 36.870C and 12.430C to 31.590C respectively for January month 14.880C to 38.870C, 16.310C to 35.900C, 13.210C to 33.400C for Feuary month, 16.830 C to 27.970C, 24.4 to 46.620C, 20.440C to 46.620C, 20.570C to 41.350C for March month respectively. In April month it was found to be 22.310C to 48.800C, 22.170C to 43.400C for type-II and type-III in April month respectively. The variation in average ventilation rate per minute from January to April months were observed to be 1.7 to 1.9, 2.0 to 2.3 and 2.1 to 2.5 respectively for type-I, II and III. The mathematical models developed for soil bed and pot cultivation conditions using the energy balance equations and comparison of predicted temperature values with measured data has shown good fitting to the pattern of diurnal variation of weekly average temperatures for all the three types of greenhouses. The maximum fitting efficiency of the models was found as 94%, 77% and 98% for type-I, II and III respectively. 