Abstract
Analysis of Optimal Injection Ratio of Vapor Injection Heat Pump for Electric Railway Vehicles
Highlights
Urban rail transit has brought important impact on low-carbon development to reduce energy consumption and carbon emissions, as well as solve the increasing density of urban traffic
Based on the above design program, the heating performance of the Vapor Injection (VI) heat pump is analysed under different working conditions
Through the modelling of an Air-Source Heat Pump (ASHP) with VI of internal heat exchanger cycle, the optimal injection ratio based on the optimum heating Coefficient of Performance (COP) is obtained on the typical working conditions of electric railway vehicles
Summary
Urban rail transit has brought important impact on low-carbon development to reduce energy consumption and carbon emissions, as well as solve the increasing density of urban traffic. Air-Source Heat Pump (ASHP) with Vapor Injection (VI) is an effective method to enhance the heating performance in cold regions, because of three main advantages [1]:. Capacity improvement in severe climate; Capacity variation by controlling the injected refrigerant mass flow rate; Lower compressor discharge temperature. It has been applied since 1979 for air conditioners [2]. A heating performance analysis program for an ASHP with VI of internal heat exchanger cycle is set up to analyse the optimal injection ratio according to the working conditions of electric railway vehicles.
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