Research On The Influence Of Active And Passive Solar Heating System On Indoor Comfort

Gannan Tibetan Autonomous Prefecture is located between the northeast edge of Qinghai-Tibet Plateau,and the western part of Loess Plateau.It is rich in term of solar energy resources,and it is cold in winter.The annual temperature is low,the temperature is considerably varing during the day.Gannan Tibetan is characterized by the long heating season that extend for 7 months.In winter,the main heating materials are coal,and cow manure.These buildings are suffering from low indoor temperature in addition to a serious environmental pollution.Therefore,using the abundant solar energy to meet the heating demand in winter is not only expected to improve indoor comfort,but also favor to reduce ecological damage and environmental pollution.This research takes a single building with a passive sun-space located in Shanglangkanmu Village,Zogmanma Township,Gannan Tibetan Autonomous Prefecture as the research object,which transforms its traditional heating mode into a combined solar active and passive heating system.Selecting the traditional single building as the comparative object,according to?GB50785-2012?“Civil Building Indoor Thermo-humidy Environment Evaluation Standard”,and?GBT18883-2002?“Indoor Air Quality Standard”,the outdoor environmental parameters,indoor temperature,humidity distribution,and various indoor pollutant contents were continuously tested for 177 days.Then the temperature field distribution,and indoor temperature fluctuation were analyzed.Finally,the indoor thermal environment and indoor air quality were evaluated based on PMV-PPD index and IAQ index,and the indoor comfort of solar active and passive heating buildings was revealed.The main results are as follows:?1?The indoor thermal environment of the solar active and passive heating buildings is better than those of the traditional heating buildings.During the whole heating season,the solar active and passive heating buildings basically meet the requirements of"Energy-saving Design Standard for Rural Residential Buildings"?GBT50824-2013?,and the average indoor temperature is 5-6 degrees higher than that of traditional heating buildings,and the indoor temperature distribution is more uniform.The indoor maximum and minimum relative humidity of the active and passive solar heating buildings were 55%and 47%,respectively.The indoor wind speed was close to 0,Which indicates no wind sensed in the room.The fluctuation of indoor wind speed is lower than that of the traditional heating buildings.?2?The indoor air quality of solar active and passive heating buildings was better than that of the traditional heating buildings.The 1-hour average of SO₂ and CO,8-hour average of VOC,daily average of CO₂,PM10 and PM2.5 in solar active and passive heating buildings all mets the requirements of National Standard for Indoor Air Quality?GBT18883-2002?.The indoor pollutant concentration of traditional heating buildings was higher than that of solar active and passive heating buildings.The concentration of SO₂,NO₂,CO₂ and PMl0 was lower than the standard value,and PM10 was obviously beyond the standard in case of traditional heating buildings.?3?The indoor thermal comfort and indoor air quality of solar active and passive heating buildings were evaluated and graded by using PMV-PPD evaluation index and IAQ ?.In March,April and October,the indoor thermal environment met the national grade ? standard;in February and November,it met the grade ? standard;since January and December were the coldest,the indoor thermal environment was grade ?,which means the indoor thermal comfort was poor.Indoor air quality met Class ? standard in the whole heating season.The indoor thermal comfort evaluation and the indoor air quality were combined together,and then the indoor comfort was comprehensively evaluated.The indoor comfort degree in March,April,and October was ranked Grade ?,February and November were ranked Grade ?,and the indoor comfort degree in January and December was greater than Grade ?.The innovation of this thesis:For the first time,the active and passive solar heating system was applied in Gannan Tibetan area.The building's indoor thermal environment and indoor air quality were extensively tested and analysed,and the results were compared with those of the traditional building.Furthermore,a complete indoor comfort evaluation was made.The results of this research have a great significance for the promotion of solar heating in this area.