Analysis And Optimization Of Thermal Comfort On Localized Automotive Air Conditioning

The main function of automobile air conditioning is to adjust the internal thermal environment of the cockpit and improve the thermal comfort of passengers.In summer,the opening of the automobile air conditioning will lead to the reduction of vehicle power and the increase of fuel consumption.Therefore,reducing the energy consumption of automobile air conditioning without sacrificing the thermal comfort of the occupants is the trend of automobile air conditioning product design.While the vehicle as a travel tool,it is very common for drivers to exist only in the cockpit,at this time,the use of ordinary automotive air conditioning to improve the driver’s thermal comfort will cause energy waste.Therefore,it is of great significance to keep a balance between thermal comfort and energy saving by studying the new air supply structure of automobile air conditioning.The current research on the internal flow field in the cockpit is mainly divided into numerical simulation and experimental research.The experimental research method is expensive and the flow field data obtained is limited.Thus,the numerical simulation method is used to study the internal flow field in the cockpit in this paper.And in this paper,the physical model of the 1:1 cockpit is established at first and also the reasonable simulation boundary conditions are set up.Then the correctness of the model and the simulation boundary conditions are verified by the test of the flow field in the cockpit.Two kinds of evaluation standards of thermal comfort in cockpit are selected in this paper.They are the weighted PMV and the₀)and are all used to evaluate the thermal comfort of drivers in the cockpit.The two evaluation standards have been verified by each other.Then,the internal flow field and temperature field characteristics and the driver’s thermal comfort in the cockpit of the ordinary automotive air conditioning are studied with two parameters:air supply temperature and air supply wind speed.Then the refrigerating capacity of automobile air conditioner under different working conditions is calculated.At last,three kinds of air outlet structures of localized automotive air conditioning are designed in accordance with the existing air outlet structure.The distribution characteristics of flow field and temperature field in various working conditions under the air supply structure of localized automotive air conditioning are studied.And the rationality of the structural design of localized automotive air conditioning is analyzed from the perspective of thermal comfort and energy saving.A condition with good thermal comfort in the condition of ordinary automotive air conditioning is selected as the comparison condition to verify the energy saving effect and the cooling effect of localized automotive air conditioning.The final result shows that,under the working condition of the combination of top air supply and side supply air supply,the evaluation result of thermal comfort of the driver of the localized automotive air conditioning is good and the energy saving effect of the localized automotive air conditioning is remarkable.The localized automotive air conditioning is about41.4%energy saving than the ordinary automotive air conditioning.Thus the localized automotive air conditioning can realize energy saving without sacrificing the thermal comfort of the driver.