温室自然通风研究

与强制降温相比,温室自然通风是一种较经济的降温方式。本文对比分析了自然通风的几种研究方法,发现示踪气体测量技术和通过数理模型计算通风率的方法是研究自然通风原理和效果的比较直接的方法,它们为能量守恒环境参数预测模型研究奠定了基础。目前借助自然通风率计算公式,应用能量守恒方法研究自然通风应用比较广泛。虽然前人对自然通风已经做了非常深入的研究,但尚未涉及应用预测模型,决策采用天窗通风还是天窗、侧窗同时通风;以及不同通风面积的降温能力,并且还没有将自然通风模型应用到温室自动控制系统中。因此,建立温室自然通风环境预测模型,通过精确的试验,确定模型参数,并将模型应用于指导温室环境控制,具有积极的意义。

Study of Greenhouse Natural Ventilation

Natural ventilation uses very little external energy as compared with forced ventilation Methods of studying natural ventilation were contrasted and analyzed. Results show that tracer gas techniques and mathematics- physics model are direct and they are basis of energy balance method. The energy balance method is widely used to develop natural ventilation model. But few use the model to greenhouse environment control. Few also use model to decide whether to open roof-window or open side window when low temperature is needed. Developing natural ventilation model and deciding its parameters by experiments are necessary. And are applying these models to greenhouse environment control system is more and more important.