چكيده به لاتين
The automotive air conditioning system carries out a series of measures on the air
inside the car cabin to improve the comfort of the driver and the passengers. In
addition to the comfort of the passengers, sometimes this can prevent the
occurrence of disaster accident by creating the appropriate mental and intellectual
conditions. One of these measures is the control of air temperature and humidity
inside the cabin. On the other hand, the air conditioning system in electric
vehicles is so important. Because the air conditioning system is a thermodynamic
refrigeration cycle or a heating circuit, so it requires a lot of energy to consume.
moreover, the structure of electric vehicles is designed in a way that in
comparison with the combustion engines vehicles, there is not enough heat from
the engine source, so there may be some challenges in cabin heating. Therefore,
to resolve this problem it is quite necessary to do a lot of research work and
scientific investigation. In this study, considering the different weather conditions
in the cities of Iran, at first stage the refrigeration cycle and the cabin of the L90
vehicle were simulated numerically and then validated with the results of the
experimental model and finally, by using this model, the system implementation
was investigated for heating mode in a cold climate condition. During the cooling
cycle operation, the cabin air temperature in its final value, (from 60 °C) reached
to 23 °C in 600 seconds. Also, in its utilization as a heating cycle, the cabin air
temperature in 600 seconds reached a temperature of 23 °C from -10 °C. These
simulated results showed that the designed cycle has highly accuracy compared
to its similar ones. In addition, the results of the study showed that the R134a
refrigerant gas system does not perform well at temperatures below -13.5 ° C. In
the sequence, the effects of alternative refrigerant gases with the aim of improving
cyclic performance factors as well as environmental considerations were
investigated. The results showed that this modeling cycle with CO2 refrigerant
gas has a proper cooling capacity and high coefficient of performance relative to
its performance with R134a refrigerant gas. But due to the low temperature and
critical pressure of the CO2 refrigerant, it was concluded that the simulated
compressor in this model is not suitable for high CO2 pressures and therefore
requires highly advanced leakage compressors
