| In order to respond to the goal of carbon peaking and carbon neutrality proposed by the state and effectively promote the action of carbon peaking,the first thing is to promote the green and low-carbon transformation of urban and rural construction and attach importance to the use of clean energy.However,the single utilization of solar energy resources has strict requirements for the region and time,so combining with the policy background of"peak-valley time-sharing pricing",the rational utilization of electric energy can be achieved.At the same time,biomass energy has four characteristics of renewability,low pollution,wide distribution and abundant biomass fuel amount,which can make up for the shortage of solar energy in time and space.Based on the above ideas and considering the geographical location,climatic characteristics and current heating situation of Shijiazhuang,a thermal engineering laboratory of a university was taken as the research object to integrate solar energy,biomass energy and electric energy,and conduct a research on the integration of solar energy,biomass energy and valley electric heat storage combined heating system.First of all,taking the active solar combined heating system as the thought frame,the whole system is divided into:heat supply end,heat storage and storage end,heating end and control end for equipment calculation and selection,to determine the design parameters of the system related equipment.Secondly,according to the design principle of the heating system,the schematic diagram of the combined heating system is drawn,and the specific operation mode and control strategy are given to realize the coordinated control of each unit in different periods of the heating process,improve the energy utilization rate,and ensure the stable operation of the combined heating system.Next,TRNSYS software is used to build the simulation model of the joint heating system:The TRNOPT module in the software TRNSYS is connected with the software Genopt.Taking the annual cost as the optimization target parameter,the solar collector area,the solar collector dip azimuth,the volume of the heat storage tank and the quality of the phase change material in the combined heating system are optimized,and the optimal values of the optimization parameters are obtained.The initial investment and energy consumption of the system before and after optimization are analyzed in detail.Finally,the experimental platform of the combined heating system is built to study the influence of heating flow and temperature on the system.Meanwhile,the overall operating thermal benefit of the system is analyzed through the experiment,as well as the experimental errors,so as to ensure the rationality and accuracy of the design of the combined heating system.It is found that the solar energy,biomass energy and valley electricity combined heating integrated system has the advantages of stable heating and can meet the heating demand at low temperature.The combined heating system has good thermal comfort and the average heating efficiency of the system is 66.20%.The use of trough electricity heat storage heating at night is good for maintaining the stability of indoor temperature.During peak electricity time,the heat release fills up the decrease of room temperature caused by the shortage of solar heat supply,and plays the role of peak cutting and valley filling.Moreover,the solar collector dip Angle and azimuth Angle,solar collector area,water tank volume and phase change material in the system were optimized,and the optimal values were obtained as 54.375°,3.25°south to east,19.625 m~2,2.723 m~3 and 90 kg,respectively.The integrated system has effectively improved the energy utilization rate and the initial investment of the system,and has played a role in both economy and energy saving.It has certain guiding significance for the establishment and implementation of the heating system later,and has contributed part of theoretical and experimental basis for the application of the system in Shijiazhuang and other areas. |
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