| For an internal combustion engine, only one third of the fuel energy is used effectively. The left is released through exhaust, cooling system and etc. Recovering the released energy using Rankine cycle can increase the brake power and reduce the fuel consumption and emission of CO2. For a successful RC system, the evaporator design is a critical part which Determining the amount of heat that can be transferred. In view of the technical features of heat pipe evaporator is designed for the cooling system of the commercial vehicle in this research. Then the application feasibility of heat pipe charge water cooler in the vehicle cooling system is conducted. The heat transfer performance of evaporator is studied by theoretical analysis, numerical simulation and experimental research. Meanwhile the matching optimizations of parameters in evaporator under different pressure are investigated. The main contents of this paper include:1. Considering the requirements of heat transfer performance for the evaporator, the calculation model of evaporator is built based on energy conservation equation, continuity equation, gas flowing equation, and heat transferring equation.2. The steady-state numerical model is built based on Simulink software using e-NTU (effectiveness-number of heat transfer units) method and the influences on the total heat transfer performance with different input parameters are investigated.3. The dynamic numerical model is built based on Matlab software is built to investigate the heat transfer performance in evaporator under the dynamic input parameters.4. An experiment system on evaporator has been established to study the influences on the total heat transfer performance and validate the steady-state and dynamic numerical model.5. An evaluation method about the quality of evaporator is presented by making the conclusion of theory research and experiment data, which lay the ground work for application of waste heat recovery system. |
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