Study On The Indoor Thermal Environment Of Solar Heating By Time And Spatial Partition Heating Strategy

In the winter heating of residential buildings in China,the comprehensive continuous heating operation strategy is wid ely used.However,if in a village or town with relatively limited economic conditions,or in an area with scarce natural resources,or in a residential building that relies solely on solar heating,the source of heat is not sufficient to provide the heat required for the overall heating of the building,If a comprehensive and continuous heating strategy is still adopted,it will not only fail to meet the requirements of the occupants for the indoor thermal environment,but also waste energy.Therefore,how to meet the space-time energy demand and supply of indoor energy is particularly important,based on the energy use habits and working and rest rules of residents,while not generating unnecessary heat consumption.It can not only meet the requirements of indoor thermal comfort,but also achieve the purpose of energy saving and emission reduction.However,there is no report on the time and spatial partition heating(TSPH)strategy for active solar heating system.A brick-concrete green building with a total area of 99m2 was built in Weiling Township of Lanzhou City.The solar array heating system of all-glass vacuum tube is adopted for its winter heating.In this paper,considering the difference of the use function of different rooms in the single building,the district heating of the building room was carried out,and according to the rules of human working and rest and the requirements of the indoor thermal environment in different time periods,the time sharing heating of the building room was carried out.The indoor thermal comfort and energy saving of buildings in time-sharing and non-time-sharing areas are compared and analyzed.The indoor thermal comfort and energy saving of buildings under two heating strategies are compared and analyzed.The main research contents and results of this paper are as follows:(1)Through research,it is found that,for active solar heating systems,When the time division heating mode was adopted,16: 20 ~19: 00 for the living room heating,19: 00~3: 00 for the bedroom heating,solar heating system to provide the living room heat accounts for 42 percent of the total heat supply building heat,the heat for the bedroom to provide 58% of the total building heat.Using PMV-PPD evaluation,it is found that the thermal comfort evaluation of the bedroom and living room is all of grade ?? in the period of 17: 00~21: 00,and that in the period of 21: 00 ~07: 00,the evaluation of thermal comfort of the bedroom is basically maintained in the vicinity of grade ?.When adopting untime-sharing district heating strategy,in the period of 16: 20-19: 00,the heat supplied to the living room and the bedroom accounted for 21.6% and 18.6% of the total heat supplied by the heating system,respectively;and in the period of 19: 20-3: 00,the heat supplied to the living room and the bedroom accounted for 32.1% and 27.7% of the total heat supplied by the heating system,respectively.Using the PMV-PPD index,it is found that in the period of 17: 00 ~ 21: 00 and 21: 00~ 07: 00,the thermal comfort evaluation of each room is the same,all of which are of grade ??.Therefore,using TSPH operation strategy can effectively improve the indoor thermal environment of heating.(2)The study also found that when different heating strategies were adopted,the local dissatisfaction rate caused by indoor vertical temperature difference was relatively small,and the maximum local dissatisfaction rate was no more than 4%.The local discontentment rate caused by the change of floor surface temperature in heating period is small and negligible.(3)Furthermore,the calculation of building heat loss with different heating strategies shows that,When the time and spatial partition heating operation strategy is adopted,the total heat loss of the single building within 24 hour s accounts for 34.4% of the total heat supply,while the total heat loss of the single building accounts for 44.75% of the heat supply when not using time and spatial partition heating strategy.It can be seen that the time-sharing district heating can reduce the building heat loss more than 10%,or more than 10% of the solar energy collection area.Comprehensive analysis shows that the use of TSPH operation strategy has specific advantages,so that the heat of heating system can be effectively distribut ed and utilized,and the indoor thermal comfort of different functional rooms can be significantly improved in different time periods.Not only save energy,but also can improve the heating efficiency of the heating system.Furthermore,it is found that the reduced heat loss of the building is stored in different positions of the building in the form of heat when time and spatial partition heating strategy was used.The innovation of this topic lies in:Based on human energy usage habits and working and rest laws,considering the difference of thermal demand of different rooms in different periods of time and the characteristics of active solar energy supply system,TSPH operation strategy is proposed in this paper.And the advantages of TSPH operation strategy applied to active solar heating system in improving indoor thermal environment,saving energy and economy are verified.