Performance Study Of Porous Solar Wall Heating Room

Solar-wall system is a new type of solar heating technology, which has proven to beeffective both in heating and ventilation. It is of great significance to save conventionalenergy, reduce environmental pollution and improve the ecological balance. The principle,characteristic and examples of solar-wall around the world are introduced at first. Solarhouse of thermal storage wall is the most widely used because of thermal storage function.The built porous solar wall heating room in the paper use porous ceramic as materialsof as thermal storage wall and it has inverter fans and return air ducts, so it has a advantageof high solar energy utilization efficiency, the self-regulating proportion of heating andventilation, good daylighting and high comfort. According to the experimental study of thebuilt solar houses, the result shows that indoor temperature field is uniform, it is of greaterimpact of weather conditions and solar radiation intensity, which means that the solar-wallhouse could achieve the best performance of heating under the condition of sunny daywithout clouds and low ambient temperature, and the inverter fan can be used to adjust theheating performance.In this paper, considering the heat transfer mechanisms of the porous solar wallheating room, as well as the influence of fan and return air duct, a numerical model is usedto describe the heat transfer and flow in the porous solar wall system and it is of highaccuracy. Simulation results are as follows: temperature distribution of solar-wall skeletonand pore air is more uniform; most of the solar radiation absorbed by the solar-wall areused to heat the air in real time for the indoor heating, save up for a small part is providedfor of the indoor heating at night; the greater the intensity of solar radiation, the betterheating performance of solar-wall house; due to the different physical parameters of theporous material, the collector thermal storage properties of the porous solar wall heatingroom varies, using ceramic as materials could achieve the best balance of heating and heatstorage; the thermal conductivity, porosity and heat storage capacity of porous materialgreater impact on the performance of solar houses, increasing the thermal conductivity ofthe porous wall causes more uniform temperature field, increasing the porosity will reduce the heating performance of the system but the flow resistance decreases, increasing the heatstorage capacity can improve the heating performance of the system; when the fan flowspeed is high, heating performance of the solar-wall house is weak; increasing the rate ofreturn air can effectively improve the performance of the system of the porous solar wallheating room, but the system has less fresh air, return air rate should be adjusted to addressthe improvement of contradiction between ventilation and heating.In this paper, the overall efficiency of the porous solar wall heating room is good,heating requirements can be achieved in a long time.