Automobile thermostat shell material manufacturer introduces the principle and method of temperature control for automobile manual air conditioner
1. Composition of automobile air conditioner
Automobile air conditioning is generally composed of compressor, electric clutch, condenser, evaporator, expansion valve, desiccator, pipeline, condensing fan, vacuum solenoid valve, idler and control system.
Most cars, minibuses and minibuses use non independent air conditioning - air conditioning systems that directly use the engine of the car to run. The compressor is driven by main engine and controlled by electromagnetic clutch. The utility model has the advantages of simple structure, convenient installation and arrangement, and low noise. As the main engine needs to consume 10% - 15% of the power, it directly affects the acceleration performance and climbing ability of the vehicle. At the same time, the cooling capacity is affected by the vehicle speed.
2. Characteristics of automobile air conditioning system
(1) The vibration of air conditioning device is large when it is running
As mentioned above, the automobile air conditioning device is a mobile vehicle air conditioning device. Due to the uneven road and the large vibration of the vehicle during driving, the flexible refrigerant pipe should be used in the connecting pipe of the device.
(2) The condenser is close to the radiator of the engine, so its condensation temperature is often very high, so its operating conditions are worse than other air conditioning devices.
(3) The compressor of automobile air-conditioning system is directly driven by the engine. When the compressor does not work, the compressor can be separated from the engine. It is realized through an electronic clutch. When the sensor installed in the evaporator outlet senses that the temperature of the air outlet is not low enough, it will close the magnetic clutch of the compressor through the circuit.
In this way, the compressor runs with the engine to realize refrigeration. When the outlet air temperature is lower than the set temperature, it will control the magnetic clutch to cut off, so that the compressor does not work.
When the car is idling, the cooling idling speed of the air conditioner will increase significantly, and the fuel consumption will also increase by 0.3-0.8 L / h. The increase of fuel consumption is directly related to the ambient temperature. With high ambient temperature, the expansion pressure of refrigerant is large, the consumption of engine driven air conditioner is also increased, and the fuel consumption is reduced with low ambient temperature
Automotive air conditioning compressors are basically of fixed frequency type, without power regulation. As long as the air conditioner is turned on, the fuel consumption is fixed, which has nothing to do with the air conditioning temperature adjustment. The higher the temperature is, the higher the air temperature is, because the air valve of hot water part in the air conditioning system is opened, hot air is sent in while cooling, and the cold air is neutralized to get the required comfortable temperature
Heating system principle: the heating of automobile air conditioning has nothing to do with the compressor. The heat source of heating is not obtained by the air conditioner itself, but provided by the cooling water tank of the car. Basically, there is no energy consumption. It is completed by using the waste heat of the car. (however, in winter, in order to improve the water temperature and increase the fuel injection, the fuel consumption will also increase. However, it is only in the early stage of start-up, when the engine runs normally, the heat dissipation of the engine is used to heat the engine.)
Dehumidification: the process of air conditioning refrigeration is the process of dehumidification
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