Study On Thermal Performance Of A Solar Building And Its Parts

In this paper , a solar building is taken as model which is heated in winter by passive and objective ways. They are solar radiant floor heating system and sptar air heater .The mathematical model of energy balance is built . The influence of the construction of solar air heater on its thermal performance is analyzed . To make the thermal efficiency best , y , A , Av/As should be:r: [60° -75° ] A: [1 - 1.5] Av/As: [0.8-1]In this paper , numerical model of solar radiant floor heating system is also built . The model of numerical model is solved by finite differance method .The smaller the distance to the tube is , the higher the temperature on the surface of the floor is . The smaller the the difference of the temperature of feedwater and backwater is , the more evenly and slowly the temperature distribution is .The smaller the thickness of overburden layer and the distance of two tubes are , the more evenly and slowly the temperature distribution is .The temperature of feedwater and backwater suited to solar radiant floor heating is 40℃/35℃ , the distance between two tubes is 160mm , the thickness of overburden layer is 60mm.