Length Determination Of The Solar Greenhouse North Wall In Lanzhou

In order to determine the optimal length of the greenhouse north wall in Lanzhou, this paper uses the Ecotect and Energyplus v8.6 to evaluate the effect of length of the greenhouse north wall on its indoor thermal environment. Then, the total heat storage/release capacity and the reduction rate of the shadow were proposed. The results show that under different weather conditions, the maximum shadow rate of the east and the west walls of the winter solstice appear at 10: 00 in Lanzhou. With the length of the north wall increases, the reduction rate of the shadow gradually decreases, and when the length increases to about 90m, the shadow reduction rate changes smaller. The total heat storage capacity basically equals to its total heat release in a sunny day. While the length is more than 90m, the total heat release is greater than the total heat storage, and the indoor air temperature is lower than that of 90m in next day morning in typical cloudy day. Combined with the needs of the ventilation and insulation in solar greenhouse, the optimal length of north wall of solar greenhouse is about 90m in Lanzhou. The results can provide a reference for the scientific construction of the solar greenhouse in Lanzhou. (c) 2017 The Authors. Published by Elsevier Ltd.