Studies On A System Utilizing Energy Of Biomass And Solar For Space Heating And Hot Water Supplying Of Rural Residence

As the fossil energy crisis and environmental problems become more and more serious,our country has issued relevant policies to encourage the utilization and research of renewable energy.With the progress of the new rural construction in China,the demand for the quality of life in rural areas has gradually improved.However,there are serious problems such as serious waste of biomass and solar energy,large energy consumption,environmental pollution and poor quality of life.In order to alleviate the contradiction between the growing demand for quality of life of farmers and the lack of energy saving technology in rural areas,based on the biomass energy and solar energy utilization in rural areas of our country and the biomass straw briquette heating equipment developed by our group,this paper designs a system utilizing energy of biomass and solar for space heating and hot water supplying of the rural residence.Firstly,using TRNSYS software to simulate the connection scheme,operation mode and collector heat area of the system.The simulation results show that:(1)The connection schemes of water supply regulation is better that has the high solar energy guarantee rate and the lower energy dissipation.(2)The solar collector is used as the auxiliary heat source to improve the solar energy utilization rate of the system.(3)Different families correspond to the different optimal collector area of the heat collector.And then,our combined system platform was built in a farm house in Tianjin.The actual operation of the system was studied for both sunny and cloudy days,and discussed the best mode of operation of the system.The solar branch distribution traffic is adjusted to 150L/h on sunny day,and intermittent operation mode on cloudy or nighttime is the best operation mode,which can reduce the fuel consumption and increase the system thermal efficiency.On clear days,the minimum fuel consumption of the system is 2.74 kg/h,energy saving is about 19%,and the system thermal efficiency is about 85.75%.Under different operating modes,the indoor temperature range can be maintained at 16-23 degrees centigrade.In the process of using hot water,the temperature of the solar tank is still above 40 degrees centigrade.In the whole heating season,the solar energy guarantee rate is about 3.56%,it can save 6.03% of biomass fuel and the average heat efficiency of the system increased by 4.11%.This system can not only reduce energy consumption and meet the daily heating demand,but also ensure the hot water demand of the users in winter and improve the quality of life in rural areas.This study has important reference value for clean renewable energy utilization,multi energy combined use and heating system research in rural areas of northern China.