Performance Study Of Automotive Waste Heat Absorption Refrigeration System

With the rapid development of the economy and society,the shortage of fossil energy,energy saving and emission reduction has been imminent.Especially in the automotive industry,air conditioning and refrigeration will increase the consumption of fuel,in addition,the mechanical efficiency of the engine is only about 35%,and a large amount of heat is not used.To address the above problems,the automotive waste heat absorption refrigeration system is analyzed.Firstly,the heat balance model of the car is established,and the cold load characteristics of the car under different working conditions are analyzed by using the steady-state analysis method.The results show that solar radiation has the greatest influence on the cold load,and the cold load formed by each component of the envelope model is positively correlated with solar radiation during a day.The larger the absorption rate is,the larger the cold load is.The increase in vehicle speed causes a reduction in cold load,but the reduction in cold load at high speed is not significant.The percentage of heat and fresh air load through the windows is close to 50%.When the vehicle speed is45 km/h and the absorption rate is 0.85,the maximum cold load is 3664.6 W at 14:00.Secondly,the waste heat driven absorption refrigeration system was designed based on cold load matching with engine coolant as the main heat source and tailpipe flue gas waste heat as the auxiliary heat source.The results show that the performance coefficient of the unit can reach 0.73,the total heat exchange area is 1.76 m~2,and the total weight of the heat exchange equipment is 17.62 kg.Finally,the cooling performance analysis of the coupled system shows that the volume flow rate and circulation multiplier of the engine coolant are positively correlated with the cooling capacity for different cooling capacities.The coefficient of performance COP increases as the external temperature decreases.In addition,the higher the heat source temperature,the COP of the unit performance coefficient increases.Figure 39;Table 17;Reference 57;...