Study On The Absorption Of Soil And Solar Energy By Micro Energy Network

In recent years,under the guidance and promotion of national policies,the application of new energy in various fields is increasing.But the waste of new energy is also an urgent problem to be solved.For example,the phenomenon of solar energy abandonment still exists every year.Based on the national policy and the premise of improving the energy utilization rate,a study on the absorption of solar energy and soil sources was carried out with micro energy network as the starting point.Firstly,the operation of heat pump system is studied in detail.This paper analyzes the principle of the heat pump cycle system and the operation process of the heat pump cycle system,which provides the research direction for improving the absorption and utilization of the earth source and solar energy.Secondly,the characteristics of the ground source are analyzed,and combined with the heat pump system,the ground source heat pump heating system with the vertical buried pipe as the heat exchanger is designed,which improves the energy utilization rate of the ground source preliminarily.Further using the excellent characteristics of the soil source that the annual temperature is stable at 16 ℃-22 ℃,the design of the soil source direct refrigeration system based on the vertical buried pipe system of the soil source can solve the problem of high operation cost caused by the compressor.For the places with high refrigeration demand and large refrigeration capacity,the refrigeration circuit of soil source combined compressor operation system is designed.Under the condition of giving full play to the advantages of soil source,it can not only meet the needs of refrigeration,but also store the indoor environment into the soil source through the heat exchange under refrigeration conditions,solve the problem of soil heat imbalance,and greatly improve the consumption and utilization of soil source.In the study of solar energy consumption,in order to improve the utilization of solar energy,a direct expansion solar heat pump heating system is designed.And the use of soil source,the realization of solar energy storage,for the soil source and solar energy consumption and utilization play a good role in promoting.In order to realize the multi energy complementarity between the ground source and the solar energy,the micro energy grid operation scheme is designed,which realizes the coupling operation of photovoltaic power generation as the main power supply end,large grid auxiliary power supply,solar heat pump heating,ground source heat pump auxiliary heating,direct cooling of the ground source,solar energy cross season storage and indoor environmental energy storage.In order to evaluate the self-sufficiency of micro energy grid,the concept of micro energy grid dependency is proposed.In order to further realize the safe operation of micro energy network and reduce the probability of compressor safety failure,the superheat control of working medium in the heat pump cycle is studied,which also lays a solid foundation for the subsequent heat transfer research of plate collector.Based on the relationship between energy conservation and flow,temperature and valve,the mathematical model of electronic expansion valve and evaporator is established,and the superheat degree is simulated in Simulink.The results show that the fuzzy control method has a better control effect for the superheat control of the working medium.In addition,the evaporator(flat plate collector)is an important energy input in the micro energy network,which plays an important role in improving the operation reliability and energy utilization of the micro energy network.Therefore,the flat plate collector with aluminum tubes is studied.Based on the analysis of the energy conservation relationship,the heat transfer process of the flat plate collector with aluminum tubes is analyzed.The influence of stagnation temperature on the flat plate collector with aluminum tubes is introduced,and the mathematical models of solar energy,environmental energy and air energy are obtained.In view of this mathematical model,TRNSYS software is used for simulation analysis.It can be seen from the analysis that the total absorption capacity of the aluminum exhaust pipe collector is the sum of solar energy,air energy and environmental energy;the increasing inlet temperature will reduce the collector’s heat collection efficiency;when the wind speed is increasing and the stagnation temperature is increasing,the collector’s absorption capacity of air energy is also increasing.It can improve the efficiency of plate collector,enhance the energy consumption capacity of micro energy network,and improve the operation reliability of the whole system of micro energy network.