Studies On Solar Heating System Assisted By Biomass Boiler

Currently, the heating systems in northern towns of our country are distributedprimarily. The traditional heating methods can not only cause environmental pollution,but also the energy efficiency is low. Therefore, based on the fact that solar energy isrich in heating area of north China and biomass energy doesn`t need transportation, toresearch and develop clean solar heating system with biomass boiler as its auxiliary heatsource, and to form clean,efficient,low cost and sustainable heating mode of our countryhas important practical significance.In order to determine the economic and reasonable plan of auxiliary heat source, thispaper took a monomer residential building in a town of Xi’an for an example, andcompared solar heating systems with four different auxiliary heat sources——gas boiler,electric boiler, coal boiler and biomass boiler.The results showed that using biomassboiler as the auxiliary heat source of solar heating system is completely feasible in thetowns of xi’an. Furthermore,TRNSYS software was used to optimize the designparameters of collector heating system with biomass boiler as its auxiliary heat source.Firstly,this paper simulated changes of the solar fraction over ratio of heat storage tankto collector area（Vt/Ac）. The best Vt/Ac corresponding to different water tank pricewas gotten according to the weather conditions and Water tank price in xi`an. Secondly,based on the TRNSYS simulation results of changes of the solar fraction over collectorarea, the best collector area of the system was determined using the method of annualcost.This paper provided a reference for the design of solar heating systems, theselection of auxiliary heat source and systems optimization. Meanwhile, it obtained acharacteristic heating mode which is energy-efficient, economic, low carbon and environmental in Xi’an area. It also has favourable reference value for other similarareas in our country.