Research On Theory And Performance Of A New Type Of Heat-driven Liquid Delivery Pump

Under the background of energy shortage and environmental pollution,low-grade energy-driven power machinery and refrigeration systems came into being.As a refrigeration system driven by low-grade thermal energy,jet refrigeration system has become one of the hotspots of scholars at home and abroad in recent years.However,after research,it has been found that the incompatibility of traditional mechanical pumps and refrigerants,instability during operation,and high power consumption make low-grade thermal energy drive systems with low energy efficiency and limited development.This article reviews the research progress of heat-driven pumps,and introduces the application status of heat-driven pumps in refrigeration systems.It draws on the working principle of gas-driven hydraulic pumps to propose a new type of heatdriven liquid delivery pump.Simulation of pump delivery performance,design and parameter determination of various components in the pump body,after processing a new pump prototype,build a performance test platform,and analyze the experimental results.The research content and main conclusions are as follows:(1)Using MATLAB / Simulink for simulation calculation,the flow of the pump body can meet the design requirements,verifying the feasibility of the new heat-driven liquid delivery pump;(2)The numerical calculation results show that the flow rate of the new pump increases with the increase of driving pressure,and the increase rate gradually decreases,indicating that the flow rate of the new pump can be controlled and adjusted;(3)The pressure and flow characteristic experiments were carried out on the built performance test platform.The change trends of the pump pressure and flow characteristic curves were consistent with the theoretical results,which verified the reliability of the theoretical calculation.(4)The new pump can continue to work stably under the drive of high-temperature saturated steam and nitrogen.The new pump can realize dual-drive of low-grade thermal energy and high-pressure gas.(5)Under the same hydraulic pressure,the energy consumption per unit flow of the new pump described in this article is basically the same as that of the electric drive pump(Kaiquan pump).However,because the new pump uses low-grade waste heat,and its efficiency still has a lot of room for improvement,it has further research value.(5)Under the same pressure difference,the efficiency of the new thermal drive pump is the same as that of the traditional electric drive pump,but because the new pump uses low-grade waste heat,and its efficiency still has a lot of room to improve,so it has further research value.