AGRICULTURAL GREENHOUSE SOLAR-ASSISTEDCLIMATIZATION SYSTEMS DESIGN AND OPTIMIZATION, FOR THE SEMI-ARID REGION OF NORTHERN MEXICO

摘要

An agricultural greenhouse is thermally analyzed using the simulation program TRNSYS 17. The thermalrnloads resulting from the heating and cooling are calculated to maintain the greenhouse temperature within thernrange of crop development. Construction materials, geographical location and the optimal developmentrncharacteristics of the Saladette tomato and its different growing stages are also reported. The thermalrnperformance inside and outside the greenhouse with and without air conditioning is also described. Thernheating and cooling loads are shown for an idealized air conditioning system considering the number of heatrnexchangers, temperatures required by the crop and the hot/cold water temperature available in the system.rnThe results of a thermal analysis for a three day in June is described in detail. The temperatures inside andrnoutside of the greenhouse, including the thermal load for the most critical day of the year are shown.rnSimulation results show that 4,231,966 GJ and 39,324,140 GJ are being demanded for heating and coolingrnrespectively along a typical meteorological year. A case of study is presented in order to analyze therngreenhouse in which energetic requirement is partially provided using solar energy. The simulation showsrnthat in order to achieve a solar fraction of 72% for heating and 30% for absorption cooling, 300 solarrncollectors are needed.