Performance Research And Economic Environment Analysis Of Solar Water Heating System In High Rise Residential Buildings

With the continuous improvement of the level of economicization,problems such as imbalance of energy supply have begun to appear.The continuous growth of building conditions has begun to shift to gradual economic development.To alleviate this problem,the country has begun to use renewable clean energy.It is a clean and pollution-free energy from solar energy.It is widely available and has various applications.It has become a new alternative to international energy conversion.The use of solar energy to supply domestic hot water has become an energy-saving direction widely discussed by researchers.In the above,the centralized-distributed solar water heating system in high-rise residential buildings is studied.First,step-by-step simulation is performed,then field testing is performed,and finally the economic environment of the system is researched and analyzed.This article first uses TRNSYS software to simulate a centralized distributed solar water heating system in a high-rise residential building in Tianjin.According to the simulation results,the total annual heat collection is 58129k Wh,the annual heat collection efficiency is 41.9%,and the annual electricity consumption The amount is 5018k Wh.In order to obtain the maximum heat collection and higher heat collection efficiency,the best inclination angles of the collectors in spring and summer and autumn and winter are found,which are 20~°and 10~°and 40~°and 62~°,moreover the heat collection is 19995k W and 22915k W and 12805k W and 5367k W.The heat collection efficiency is 49.5%and 58.2%and 40.9%and 20.8%respectively.Comparing the system energy consumption under the optimal inclination angle and the system energy consumption under the optimal inclination angle of the collector in different seasons,it can be obtained that the amount of heat collected per kilowatt-hour increases from 11.5k W to 12.2k W.Next,a one-month on-site test is carried out on the actual project of the above-mentioned simulation system.Working conditions 1 and 2 respectively represent the system operation status of the system under two typical weather conditions,sunny and cloudy,and pipelines 1 and 2 are the two circulation loops included in the system respectively.By comparing the test data under the two working conditions,the operating performance of the solar water heating system is analyzed.It can be obtained that the average heat transfer coefficients of the plate heat exchanger under the two working conditions are 2828.54W/(m~2·K)and 2919.05W/(m~2·K),and the temperature difference at the outlet side of the heat exchanger is small,and the heat exchange is unreasonable.Phenomenon;the average flow rate of working condition one and two parallel pipelines are 1.54 m~3/h and 3.76 m~3/h respectively,and the unbalance rate of pipeline is 0.59;the average heat collection efficiency of the collector under the two working conditions is 27.25%and 30.33%,respectively.The heat collection efficiency of the collector is greatly affected by outdoor temperature factors.Finally,a comprehensive analysis of the economic environment of the system is carried out.The initial equipment investment of the system is 154200 yuan,the operating investment is 10509 yuan,and the annual cost is 28621 yuan.Second,use Sima Pro software to assess the life cycle impact of solar water heating systems,determine the type of environmental impact based on the CML-IA baseline method,and characterize and standardize the system results.Through analysis,it can be concluded that among various types of environmental impacts,global warming potential accounts for the largest proportion,as high as 37.8%.The entire life cycle of the system is divided into four stages:production,transportation,use and waste treatment,accounting for 15.4%and 0.1%and 92.9%and 8.4%respectively.