Simulation Study On Indoor Thermal Environment Of Passive Solar House Heat Stored By Thick-and-heavy Envelope

Passive solar house as a special form of energy saving buildings got the favor of people, becausebuilding energy consumption is increasing in our country. But the passive solar house also has itsdisadvantages, for example its indoor temperature fluctuation is high and comfort is poor. This is due tothat it can`t be able to provide heat for residence in the day without sunshine, at night or cloudy day.Therefore, it is necessary to improve and enhance the thermal comfort conditions for passive solar house,and the way to improve indoor thermal comfort for passive solar houses is very important. Otherwise, usingthe solid model to study indoor thermal environment of the passive solar houses has long cycle and highercost, but the method of software simulation is economic and rapidly. In this paper the author simulated andanalyzed the indoor thermal environment of passive solar house heat stored by thick-and-heavy envelopeand the contrast house, and through the test contrast obtained the following results:(1) From the point of the numerical simulation results, the FLUENT software application in analysisroom internal environment is feasible, also has very practical significance, because of its low cost, fastspeed and can adapt to a variety of different conditions and calculation conditions.(2) Using numerical simulation method to study the indoor temperature field and velocity field ofpassive solar houses is very convenient and effective, because FLUENT software can intuitive and clearlyconcluded that the indoor temperature field and velocity field distribution in detail, so it is of greatimportance for research the indoor thermal comfort of passive solar houses.(3) Passive solar house with the thermal storage wall which attached thick-and-heavy envelopecompared with contrast house has the following characteristics: it can improve the indoor air temperature5℃or more and can improve the inside temperature of exterior wall, up to9℃in winter.(4) Thick-and-heavy envelope can delay indoor temperature drop at night of the passive solar house,so as to reduce the indoor temperature fluctuations. Besides, it can controlled indoor temperaturefluctuations within3℃and improve the indoor thermal comfort for passive solar houses.(5) It can be seen from the flow field distribution of numerical simulation results that the indoor airvelocity distribution is very uniform. It shows that the thick-and-heavy envelope has little effect on indoorair velocity of the passive solar houses.(6) Passive solar house with the thermal storage wall which attached thick-and-heavy envelope canreduce the indoor air temperature4℃in summer.