Study On Feasibility Of Solar Heating In Northern Shaanxi Based On Low Energy Consumption Building

Northern Shaanxi is a region with severe cold and cold in the architectural climate zone,and a resource-rich zone in the national solar resource zone.The total amount of residential buildings is large and the thermal performance of the envelope is generally poor,resulting in problems such as high energy consumption and low energy utilization of buildings.With China's strong support and promotion of the use of low-energy buildings and renewable energy,this article points out the urgency and possibility of transforming the energy use of low-energy buildings in northern Shaanxi.The research methods adopted in this paper are theoretical research,numerical simulation,and measured analysis.First,by comparing buildings of different natures,it is obtained that residential buildings have the characteristics of long residence time,long heating time,and high energy consumption.It can increase part of the investment on the basis of the solar heat collection system of the original domestic hot water of the balcony,so that it can meet the building The overall heating demand,thereby improving the utilization rate of solar energy resources,and realizing the use of solar energy resources as a heat source for heating of residential buildings in the region becomes possible.For the feasibility of the above conclusions,DeST-h software was used to calculate the reference building and the low-energy building separately by numerical simulation.It is concluded that improving the thermal performance of the external protective structure can effectively reduce the heat load requirements of the building,to a large extent reduce the area of the solar collector,so that it can meet the requirements of the limited laying area of the balcony rail.In this paper,a mobile container-type active solar heating laboratory is designed and tested in northern Shaanxi.According to the analysis,the test site has sufficient sunshine and abundant solar energy resources.It is feasible to use solar energy as a heating source;the low energy consumption building has a good match with the solar heating system and the heating effect is good.The solar energy contribution rate can reach 70 %.Immediately measured and compared 4 heating operation modes under 2terminal devices and 2 control modes,it is concluded that the low-temperature forced convection radiator has a higher solar energy contribution rate in the automatic water supply control mode,and the indoor air temperature fluctuation is smaller Indoors,the PMV-PPD meets Grade I evaluation indicators 52 % of the time,and meets Grade II indicators 80 % of the time.And its economy is good,the annual value of the cost is low,the standard coal saving in the entire heating season is 236.6 kg,and the CO2 emission reduction is 0.63 t.