Feasibility Study On Clean Heating Reform Schcheme For Existing Residential Building

With the continuous development of economy and society,the international energy situation is becoming more and more serious.China,as the second larges t energy country in the world,the percentage of building energy consumption in total energy consumption of society is 30% and the percentage of heating energy consumption in cold regions is a large proportion.In recent years,with the increasing environmental problems caused by heating,the use of clean energy heating program has been strongly supported and recognized by the government,and clean heating transformation is imperative.The thermal insulation performance of old building envelopes in northern China is generally poor,resulting in a great waste of energy.Energy-saving renovation of existing residential buildings has become a key task in the 12 th Five-Year Plan.In the 13 th Five-Year Plan of China,the application scale of renewable energy buildings is also expanding.Therefore,the transformation of clean energy heating system for existing buildings is of great significance.Firstly,in this paper,building model is built by DeST software,and energy consumption simulation is carried out for four typical existing residential buildings with different energy-saving rates in Harbin.The parameters such as heat consumption index,design heat index,cumulative heat consumption during heating period are obtained,and the law of energy consumption conversion is calculated.Secondly,the applicability of various kinds of clean energy and auxiliary heat sources in typical existing residential areas in Harbin is studied and analyzed.Three kinds of combined heating schemes,namely trough solar collector,solar heat pump and ground source heat pump,are proposed,and two kinds of auxiliary heat sources,gas boiler and electromagnetic boiler,are compared and analyzed with single heat source heating schemes.In the energy-saving analysis,the concept of SHSPFae(system auxiliary equipment heating seasonal performance factor)and the primary energy performance coefficient index of clean energy heating schemes are innovatively put forward.The functional relationship between various energy-saving indicators and SHSPFae is constructed and analyzed and compared.It is concluded that trough solar collector + gas boiler is the best one.The conclusion of the scheme,in economic analysis,combined with building energy consumption simulation data,the annual cost method is used to evaluate various clean energy heating renovation schemes.Under the condition of the same system life,the trough solar collector + gas boiler is better than other alternatives.In the environmental impact assessment,various schemes are evaluated according to the emission standard of primary energy pollutants.It is found that solar heat pump + gas boiler is the best environmental benefit,while trough solar collector + gas boiler is the second best.Finally,this paper compares the energy-saving,economic and environmental benefits of various schemes.Under the condition that the safety of gas-fired boilers can be guaranteed,the groove solar collector + gas-fired boiler is determined as the comprehensive optimal scheme.The technical path,research process and results of this paper can provide reference for the clean heating transformation of existing residential buildings in severe cold areas,and have certain guiding significance.