Winter heating, as a basic need of the public, takes great effects on living habits and living level. In Gannan Tibetan Autonomous Prefecture, winter is cold and winter heating lasts for 7 months. Passive solar building technology has been advocated and spread for energy-saving and living standard improving since 1970s. At present, coal and dry cow manure are usually burned in stove for heating and indoor comfort is still unknown for the passive solar building. Considering clean heating with solar energy, an active solar heating system was developed in a passive solar building with low temperature floor irradiator and water heating Kang and indoor comfort of a passive solar building with active solar heating was compared to that with stove heating by on-site experiments and PMV-PPD method. The experimental results show that, in a whole heating season, the indoor temperature of five sevenths days meet the Standard of GB50785-2012 and humidity always meets the Standard and the concentrations of CO, SO2, NO2, PM10, PM2.5 and CO2 are always below the Standard Values in GBT18883-2002 in the passive solar building with active solar heating, while in the passive solar building with stove heating, the indoor temperature usually does not meet the Standard and the concentrations of CO, SO2, NO2, CO2, PM2.5 and PM10 are always higher than that of the passive solar building with active solar heating and the concentrations of PM2.5 and PM10 are always higher than the Standard Values in GBT18883-2002. According to the evaluation of PMV-PPD index and IAQ index, active solar heating show more favorable performances than stove heating in a passive solar building. Hence, in cold Tibetan areas, it is promising for active solar heating to take the place of stove heating in aspects of energy-saving and indoor air quality improving.
Keywords solar active and passive heating system, indoor thermal environment, indoor air quality, indoor comfort