Application Research Of Coaxial Tube Phase Change Heat Storage And Heat Exchange Device

My country is a big energy consuming country,the utilization efficiency of waste heat resources is lower than that of developed countries,and a lot of waste heat resources are wasted.Due to its intermittent and dispersive characteristics,waste heat resources are difficult to recycle.Because of its special advantages,phase-change energy storage technology can effectively solve the problem of the mismatch of waste heat resources in space and time.Phase change heat storage technology has very broad development prospects in the field of waste heat recovery and utilization.This paper designs the use of stainless steel to make phase change heat storage and heat exchange devices.First,the corrosiveness of several phase change materials to be used,including single fatty acid,fatty acid and paraffin mixed phase change material,and composite phase change material prepared by adding graphite,to 304 stainless steel is studied..In the experiment,304 stainless steel was immersed in a phase change material solution at 80℃ to test the quality of the stainless steel at different times,and the corrosion resistance of the stainless steel to the phase change material was studied through quality changes.According to the test and research results,the type and proportion of phase change materials that have less corrosion to stainless steel are determined,which provides a reference for the selection of energy storage medium for phase change heat storage and heat exchange devices.The phase change heat storage and heat exchange device is used as the carrier of heat storage and heat release,the self-prepared hot water is used as the waste heat resource,and the radiator heating terminal is used as the waste heat utilization device to establish a cycle experiment of phase change heat storage,heat release and heating.system.The process flow of waste heat recovery and utilization is designed,and the process is divided into two processes:heat storage and heat release.The hot water prepared by the electric heating water tank enters the heat exchanger to start the heat storage process.According to the different heat storage time set,the hot water circulation is stopped after the heat storage process is completed.Turn on the radiator heating system,start the heat release process of the heat exchange device,wait for the phase change material to solidify,complete the heat release process,and then enter the next heat storage cycle.Repeat this process to complete the recovery and utilization of waste heat to achieve the purpose of heating.The experimental research is carried out on the established experimental system.By setting different heat storage temperature and heat storage time,test the heat storage and heat release performance of the phase change heat storage heat exchange device.The heat storage temperature is set at 70℃ and 80℃ in two working conditions.When the heat storage temperature is 70℃,the heat storage time is set to 4h,5h,and 6h respectively;when the heat storage temperature is 80℃,the heat storage time is set to 4h,5h,6h,7h,8h.Kind of working conditions.Through the operation,debugging and testing of the experimental system,it is concluded that the inlet and outlet temperature of the phase change heat storage and heat exchange device,the inlet and outlet temperature of the radiator and the indoor temperature,as well as the influence of the heat storage temperature and heat storage time on the heating effect of the room,are the optimized operation of the system provides reference and basis.The economic analysis of the experimental system of the phase change heat storage and heat exchange device is carried out,and the investment of the phase change heat storage and heat exchange device system at three capacities of 1100 W,3300W and 5500 W is calculated,and the return on investment and the recovery period are calculated using the economic analysis method.Provide a basis for the better economy,practicability and feasibility of the phase change heat storage and heat exchange device system.