A New Characteristic Index BT of the Humidity Controlling Material in a Greenhouse Space and Its Theoretical Basis

摘要

In this essay,the charactristc index of the humidity controlling material is breifly illuminated,based on which,an observing experiment in a small enclosed box is made.According to the experimental phenomenon and the basic principles of the thermodynamics,the formulation of the humidity parameter in a closed space of greenhouse is derived,from the angle of two-phase equilibrium.We assert that the purpose of using B,the charateristic parameter,is to ensure that the temperature of the subjest is zero.So when the temperature is not zero,using this parameter will cause error.Since the imperfection of B,it is necessary to use another parameter,BT,which is derived according to the temperature of the subject and proved more reasonable,to reply the former one.Both parameters can reflect the combination of the material and the moisture,which relate to the binding energy.The humidity controlling character proves better,if the binding energy becomes closer to that of two pure water molecules.