Research Of An Active Carbon/Methanol Adsorption Refrigeration System Driving By Fuel Cell Electrical Vehicle Waste Heat

The development and research of the fuel cell electrical vehicle become the main current of all countries development green automobile. The work efficiency of the fuel cell is generally about 50%, so it will have tremendous social economic meaning to its waste heat recovery exploitation. Adsorption refrigeration gets an extensive concern in recent years for environment friendly and making use of low-grade thermal energy. The aim of this dissertation is to make the request that the automobile air conditioning system matches energy saving and protect the environment through recover the waste heat from fuel cell electrical vehicle and use for adsorption refrigeration.Choose TOYOTA FCHV produced by Toyota automobile company as research object, research of an active carbon/methanol adsorption refrigeration system driving by fuel cell electrical vehicle waste heat.The thermodynamics process was carried on analysis for three kinds of adsorption refrigeration loops including basic two bed consecution loop, adiabatic mass recovery loop and isothermal mass recovery loop. Adopt C++ language carry on imitating calculation, inquiry into each parameter (including evaporating temperature, condensing temperature, temperature of heat reservoir) the influence of desorption temperature, adsorption temperature, adsorption ratio, COP, refrigeration output. Result showed that isothermal mass recovery loop can be better to match adsorption refrigeration system driving by fuel cell electrical vehicle waste heat.Adsorption refrigeration system is constituted of three loops: adsorption bed heating and cooling loop, adsorbate loop and hot water loop. Cell adsorption duct combination configuration is adopted for adsorption bed, serpentine heat interchanger is adopted for evaporator and condenser, thermostatic expansion valve is adopted for throttle device.To investigate the heat and mass transfer process inside adsorption bed, mathematical model was established. It was solved by numerical method, discussed the relation between adsorbent temperature, adsorption ratio, adsorption capability, COP, SCP and time during cooling process, discussed the relation between desorption temperature, desorption ratio, desorption capability and time during heating process.Applied dynamic analytical method, dynamic equations for adsorption bed were built up for different phases (heating for specific volume to fix, desorbing for pressure to fix, cooling for specific volume to fix and adsorbing for pressure to fix), dynamic equations for evaporator and condenser were also built up. Mathematical models have been solved by numerical method. The influence of the cycle period, temperature of heat reservoir, temperature of ambient air, temperature of air return, temperature of cooling water upon the system performance were discussed. The relationship between time and several parameters (adsorption ratio, adsorbent temperature, condensing temperature, evaporating temperature and cooling power) has been discussed.The research provided the theories basis for the design of adsorption refrigeration system driving by low-grade thermal energy.