| Nowadays,energy and environmental issues are increasingly concerned.Organic Rankine cycle(ORC)is considered as one of the most effective and flexible solutions for power generation using thermal energy resources.This paper summarizes the previous theoretical research results.Although the research of ORC has made great progress,it has not been put into production and Application on a large scale,and the adaptability research of existing ORC system is rare,and there is no engineering level simulation and prediction model.Based on the previous experience and research results,a 2 kW micro organic Rankine cycle system is designed.Secondly,based on the conservation of mass and energy,this paper establishes the dynamic model of organic Rankine cycle cogeneration system,which includes the?-NTU algorithm heat exchanger model combined with the moving boundary method.In this paper,the experimental device of ORC system of biomass boiler is built,and the system operation and debugging experiments are carried out under stable conditions.The experimental results show that the experimental platform can complete the related performance test of ORC system,which can provide some convenience for the follow-up research;the performance of the experimental platform is verified through the related experimental research,which verifies the feasibility of the orc experimental scheme,and provides conditions for further research on the influence of cold and heat sources on the performance of ORC system.This paper proposes that the organic Rankine cycle(ORC)system as an auxiliary heat source and GSHP system operate jointly.Through seasonal heat storage,the soil heat and moisture balance is maintained,the heat pump efficiency is improved,and the energy consumption is reduced.In order to illustrate the feasibility of this method,based on the TRNSYS platform,a model of orc-gshp system is built and a long-period numerical simulation is carried out.By using this system to supply heat to small residential buildings,this paper analyzes the operation characteristics of heat storage ground source heat pump system from the aspects of ground temperature field and system energy consumption,and makes a comparative study with no heat storage ground source heat pump system.The dynamic simulation results in TRNSYS show that when orc-gshp system is used,there is great potential for energy saving.The simulation of Harbin shows that the power of the new system can reach 42.3kW through long-period simulation.Because the orc system dissipates the extra heat to the soil in the heat storage season,the soil temperature is basically stable,and the system can maintain efficient operation.However,the cop of the conventional ground source heat pump system decreased from 3.9 to 3.2,and the heating performance decreased year by year,which is not conducive to long-term heating.The system is capable of generating electricity and heating in winter.Compared with the ORC-GSHP system,in the conventional GSHP system,after 10 years of use,the annual average COP and annual average heating capacity of GSHP unit decreased by13.5%and 17.7%,respectively.Operation,while using orc-gshp system,as the orc unit emits heat to the soil,the average annual temperature of the soil is stable compared with the traditional system,and the average annual cop is kept at about 3.9.In the past 10 years,the total power consumption of ORC-GSHP combined system is 100MWh,while that of conventional GSHP system is 330MWh,more than three times of the former.In the past 10 years,the total power consumption level of orc-gshp combined system and conventional GSHP system per unit area is 0.17MWh/m~2 and 1.1MW/m~2. |
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