Car air conditioning composition parts and working principle

Today, Bianshao Automotive shares the composition and working principle of air conditioning with friends, knowledge sharing. Winter, that is, each of our friends basically do not want to happen is the air conditioning does not work. So, friends know what kind of structure and working principle of air crank? The following car system will share with friends the composition and working principle of the car air conditioning and share knowledge. I hope that the sharing of the car system will be helpful to your friends.

Working Principle of Electric Vehicle Air Conditioning:Refrigeration System

Semiconductor refrigeration, also known as thermoelectric refrigeration, is a solid-state refrigeration technology. It does not use refrigerant or moving parts. The thermoelectric stack acts as a compression refrigeration compressor, while the cold end and its heat exchanger are equivalent to a compression refrigeration evaporator, and the hot end and its heat exchanger are equivalent to a condenser. When energized, free electrons and empty holes move from the cold end to the hot end of the thermopile under the action of an external electric field, which is equivalent to the compression process of refrigerant in a compressor. At the cold end of the thermopile, the heat absorption through the heat exchanger simultaneously causes electron-vacancy hole pairs, which is equivalent to the heat absorption and evaporation of the refrigerant in the evaporator. In the hot end of the electric heat stack, the electron-vacuum-hole pair compounding occurs, while the heat is emitted through the heat exchanger, equivalent to the heating and condensation of the refrigerant in the condenser.

Thermoelectric air conditioning has the following characteristics:Thermoelectric elements require DC power to work; changing the direction of the current can cause adverse effects on cooling and heating; the thermal inertia of the thermoelectric fins is very small, and the cooling time is very short. In the case of good heat dissipation at the hot end and empty with a load at the cold end, the maximum temperature difference can be reached in less than 1 minute after the heat sink is energized. By adjusting the working current of the module, the cooling speed and temperature can be adjusted, and the precision of temperature adjustment can reach 0.001℃, which is easy to realize the continuous adjustment of energy. In the case of good design and application, the cooling efficiency can reach more than 90%, while the heating efficiency is much greater than 1; small size, light weight, compact structure is conducive to reducing the quality of maintenance of electric vehicles; high reliability, long service life, easy maintenance; there are no moving parts, so there is no vibration, friction, noise and impact resistance.

Electric air conditioning principle of operation: warm air system

Automobile fuel air conditioning system in the warm air of the key heat source is provided by the engine antifreeze, but the warm air system of the electric car is different from this. Electric air motor system warm air often meets the following scheme:

①Heat pump.DC brushless motor-driven electric vehicle heat pump air conditioning system works as shown in Figure. The cooling/heating mode of the air conditioning system is changed by a four-way reversing valve, with the solid line arrow representing the cooling state and the dashed line arrow representing the heating state. The system is no different in principle from ordinary heat pump air conditioning, but for electric vehicles, there is a specially developed double studio sliding vane compressor, DC brushless motor and variable frequency regulation system. Under the heat pump condition, when the system changes from defrosting mode to heating mode, the condensate on the heat exchanger in the duct will evaporate rapidly and frost will form on the windshield, which is related to the safety factor of driving.

②PTC electric heater: PTC electric heater is a kind of heater with PTC thermistor element as the heat source.PTC thermistor is usually made of semiconductor material, and its resistance changes rapidly with the change of humidity. When the outside temperature drops, the PTC resistance decreases accordingly, but the amount of heat generated increases accordingly. Materials can include ceramic positive temperature coefficient thermistors and organic polymer positive temperature coefficient thermistors. Ceramic PTC thermistor is used in the empty pavement mounted electric heater.PTC thermistor element has the characteristic of resistance value increasing or decreasing with the change of ambient temperature, so the PTC heater has the characteristics of energy saving, constant temperature, safety, and long service life.

Electric vehicle air conditioning principle of operation:Heat pump air conditioning system principle

Air paving auxiliary electric heaters can include bonded ceramic PTC heaters and metal PTC tubular heaters. Bonded ceramic PTC heater is a heater that uses high-temperature-resistant resin to bond multiple ceramic PTC chips and aluminum corrugated heat sinks together. It has good heat dissipation and stable electrical performance. Among them, the bonded ceramic PTC heater includes a heater surface charged type and a heater surface uncharged type.

Metal PTC tubular heater adopts imported nickel-iron alloy wire as the heating material, and the heat pipe is inlaid with aluminum fins, which has very good heat dissipation effect. The heater is equipped with temperature regulator and thermal fuse, which makes the use of the product more safe and reliable. This kind of heater has the good characteristic of PTC material, and is used as the extension heating of one point air regulation.

3) Waste heat + PTC. with the help of heat generated by high-power devices (power converters, drive motors, motor regulators, etc.). , heat can be exchanged to the interior environment of the vehicle. When the heat is insufficient, the paving PTC heater is activated.

The knowledge sharing about the composition and working principle of car air regulation ends here. After reading the sharing of electric car series, do you know the principle of car air law? Today, the sharing of Bianshao automobile ends here. If you want to know more about new energy vehicles, please pay attention to this website. Let's discuss the knowledge of new energy vehicles with Bianshao Auto.

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