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What is the Structure of the Truck Refrigeration Unit?

1. How is the truck cooling unit configured?

· Compressor

The core of a truck refrigeration unit is a power fluid machine that converts low-pressure gas to high-pressure gas. As the motor and engine run, low temperature and low pressure refrigerant gas is drawn in through the suction pipe, compressed by the piston, and released through the exhaust pipe at high temperature and high pressure. By providing energy to the surface, a refrigeration cycle that includes compression, condensation (heat release), expansion, and evaporation (heat absorption) is achieved.


· Parallel flow condenser coil

A particular kind of microchannel cooler that radiates heat outside is a parallel flow heat exchanger. It is mostly made of metal and uses a fan to force air cool it. Compact structure, light weight, low refrigerant charge, high heat exchange, and power are some of its qualities. widely utilized in fields like residential and commercial refrigeration, automotive and truck refrigeration, and home and business air conditioning.


· Copper tubes and fins evaporator coils

The most popular heat exchanger component for gas and gas-liquid heat exchangers is the tube fin heat exchanger. We improve heat transfer by introducing fins to a standard light tube. The pipe is made of materials such as stainless steel, aluminum, and copper. Copper, aluminum, stainless steel, etc. are used to make the fins. In our industry, forced air cooling by fans is integrated with the primary materials used, copper tubes and aluminum sheets. It has a sturdy construction, is dependable, flexible, simple to manufacture, and can endure greater operating pressures and temperatures.


· Expansion Valve

A crucial component of the refrigeration system, the expansion valve is often located between the liquid tank and the evaporator. The refrigerant absorbs heat in the evaporator and produces cooling by converting from a medium-high temperature, high-pressure liquid refrigerant into a low temperature, low pressure, moist vapor through the expansion valve. By altering the overheating at the end of the evaporator and preventing underuse of the evaporator section and the compressor liquid hammer phenomena, the expansion valve regulates the flow rate of the valve.


· Oil separator

Typically situated between the liquid tank and the evaporator, the expansion valve is a crucial component of the refrigeration system. The refrigerant absorbs heat in the evaporator and creates a cooling effect. The expansion valve converts the medium-high temperature, high-pressure liquid refrigerant into a low temperature, low pressure, moist vapor by squeezing. The expansion valve prevents underuse of the evaporator section and the compressor liquid hammer phenomenon by altering overheating at the end of the evaporator and controlling the flow rate of the valve.


· Filter Drier

To efficiently filter pollutants, there is a metal filter and filter floss at the outflow end. equipped with a highly hygroscopic molecular sheave that absorbs moisture from the refrigerant to provide smooth capillary flow and regular freezing system functioning. It is important to promptly replace the desiccant if it fails due to excessive water absorption.


· Solenoid valve

Defrosting solenoid valve: The solenoid valve for defrosting is situated on the defrost pipe. This valve, which generally closes, regulates the defrosting procedure. The power cannot be turned on if it is not turned on during typical cooling. The defrost valve is turned on and the input and outlet lines are attached after the device is in the defrost mode.

On the liquid supply tube is where the liquid supply solenoid valve is positioned. This valve regulates the cooling process and is generally open. Normal cooling is conducted without the use of power. In other words, the outflow and inlet are linked. The liquid supply valve is activated and the inlet and outlet are closed once the defrost mode has been entered.


· Fans (Evaporator fan/condenser fan)

This is a system’s auxiliary electronic component. The forced convection at the air input and outlet of the coil speeds up the evaporator’s heat absorption and the condenser’s heat dissipation and cooling. An axial fan is used. Simple controls are used. It is the highest ratio.


· High-pressure switch and low-pressure switch

In order to stop the system pressure from rising too high and creating a leak in the system, the high voltage switch opens when the system pressure exceeds the upper limit.


· Control panel

The complete electronic control system is powered by this. A controller that can provide return air temperature, defrosting temperature, operational time, set temperature, fault information, and more compiles all data, evaluates it, identifies it, and issues control commands. It has various operating modes, including cooling, heating, and defrosting.


· Electric controller

It serves as the system’s relay unit. The electrical control box’s relay is used by the controller to regulate the electrical equipment’s on/off switches for the evaporator fan, condenser fan, compressor, solenoid valve, and other devices that use electricity. It is aware of when electrical equipment starts and stops. This mode uses a little current to control a high current. The current of controlled electrical equipment spans from a few amps to over 20 amps, and all signal lines are at the mA level.



2. How are refrigerated trucks insulated?

Another crucial component of a refrigerated truck is a refrigerated box.

The cargo box has insulation between its twin walls. The same kind of fiberglass used for a house’s walls was also utilized in really old trucks. Today, rigid foam panels that are precisely cut to size are typically used for insulation. I’m not sure what they’re made of now, but at least some of them have been utilized and most likely still are. It may occasionally be sprayed onto a long-lasting refrigerated foam. Although it costs nothing to build, repairing it can be very painful.




3. How does truck refrigeration works?

The compressor is the primary power source for the refrigeration system. The piston compresses the low-pressure refrigerant gas from the evaporator into a high-temperature, high-pressure gas, which is then discharged to the condenser and liquefied.

The compressor’s job is to continuously draw refrigerant gas from the evaporator, evaporate it, compress it, and transfer it to the condenser while maintaining the pressure differential between the refrigerant’s suction end and discharge end. Go to a system that is closed. The major components of the other freezing truck freezing units are used to accomplish the phase transition as the flow loops constantly in one direction.

A particular type of heat exchanger is a condenser for refrigerated trucks. The heat that evaporates from the refrigerant is transferred to the cooling water or air to cause the high-temperature, high-pressure refrigerant vapor to condense at a constant pressure. Water or air is frequently utilized as the cooling medium.

Kingclima is a professional vehicle cooling solution provider. We offer refrigeration unit and air conditioner for trucks, vans, trailers, and RVs. Being a leading manufacturer of vehicle referigeration unit and AC unit, Kingclima has dived into the industry for 20 years. Trucst Kingclima, follow the market trend, make perfect cooling solution.
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