Research On Performance Of Multi-energy Complementary Heating System Based On Dynamic Heat Pipe

In recent years,as the international energy situation is becoming more severe,our country has launched a series of policies involving future energy development.Under the strong advocacy of the country,a wave of “zero energy consumption buildings” and“multi-energy complementation system” thought.The development of pump-assisted separate heat pipe technology solves many difficult problems in the past.It is controllable,adjustable,maintaining the characteristics of huge heat transfer in a short period of time,so that the application scenario is diverse.This article advances from three aspects to explore the mystery of the pump-assisted separate heat pipe in a plurality of complementary systems.Firstly,according to the actual heating renovation project of an office building as an example,the technical and economic assessment of the pre-transformation before the transformation.Calculate the initial investment and operation annual fee for various programs,research shows that,the operating annual fee of the air source heat pump scheme is superior to the traditional centralized heating system.Although the initial investment is high,all investment recovery can be achieved in 4.71.If the heat pump system using a variety of heat sources(can be freely selected according to the operating economy),the operating annual cost will be further reduced,and the heat pump scheme will be more competitive.This article uses a pump-assisted separate heat pipe system in parallel model,in combination with “main,secondary” heat source,form “multi-supply model”.Realize energy portfolios of different forms,different grades to achieve more energy efficient purposes to achieve heat pump schemes.Secondly,in order to solve this problem between multi-variates,this paper built a pump-assisted separate heat pipe multi-energy complementary heating system feature test bench.Add a spiral sleeve heat exchanger based on an air source heat pump unit including a pump-assisted separate heat pipe.The heat exchanger can theoretically be used in any form of heat,so that the finned tube heat exchanger with a spiral tube heat exchanger powered parallel heat pipes.Change the parameters such as filling rate,total flow,heat source ratio,it shows that at 65% of the charging rate,the total flow rate is 200 L/h,the heat source ratio is 4:6,and the best parallel supply is obtained,and the total heat transfer is 14.16 k W.The pump-assisted separate heat pipe is combined with the heat pump unit,theoretical calculation COP increased approximately 22.27%,and the dynamic investment recovery period of actual engineering case is expected to be shortened to 3.84.Finally,this article also uses MATLAB to establish distributed parameter models for the entire system.Simulation analysis of the overall heat exchange effect of the system,the simulation results are better with the experimental data.Further segmentation of the simulation results of the working condition indicate that at 66.2%,the flow rate is 198 L/h,the heat source ratio is 2.5:7.5,and the best heat transfer is 15.58 kW.