Research On The Comprehensive Evaluation Of Clean Energy Heating In Cold Rural Regions

Promoting clean heating,leading people through the winter with eco-environment protection,is a major project to improve people's livelihood and popular support.Most rural areas in China rely on burning coal for heating,which not only causes serious air pollution,but also has a high danger coefficient,causing a lot of inconvenience to the residents.According to investigation,the willingness of rural residents to adopt clean heating has gradually increased with the rural economic development and country's call,Therefore,among numerous heat-supply forms,choosing a suitable type of heat-supply is crucial.Considering the particularity of rural areas,such as the relatively scattered residential buildings;high heat consumptions causing by thin enclosure of building;the large open space,which can be placed large heating equipment,etc.Six kinds of heating methods are selected as the alternative of clean energy heating in cold regions– water regenerative boiler central heating system,solid regenerative boiler central heating system,air-source heat pump system,solar and electrical energy heating system,gas wall furnace and electrothermal film heating system.To construct a complete index system suitable for rural areas in cold regions,and establish a comprehensive evaluation model based on AHP's Catastrophe progression method.The selected heating system was graded and comprehensively evaluated from four aspects: economy,environment,technology and society.It is ultimately concluded that in rural areas with dense populations and conditions for centralized heating,regenerative electric boiler central heating is preferred,and for some scattered population of rural areas,household independent heating is adopted and air-source heat pump heating is preferred.Finally,on the basis of the conclusion,combined with the situation that most of northern China has sufficient sunshine and abundant solar energy resources,and rural residential structure is equipped with the conditions of using solar energy,the solar-air source heat pump multi-source heating system is proposed,the air-source heat pump system is re-evaluated as well.Using TRNSYS software for simulation,dynamic economic analysis is utilized to analyze that although the initial investment of the multi-source heating system is high,the operating cost is low,and the annual cost is only slightly higher than that of an air-source heat pump system.In addition,the comprehensive benefit of multi-source heating system is good.The local government can offer some subsidies to purchase the equipment if they weren't under so much financial pressure,then it could be widely popularized in rural areas.