The refrigeration unit of a refrigerated truck is an industrial device used to circulate liquid and lower temperatures to enhance production efficiency. It is also known as a chiller, water chiller, refrigeration unit, cooler, or freezer. These liquids can flow through heat exchangers to cool air or equipment.
The vapor compression water-cooled chiller comprises four main components of the vapor compression refrigeration cycle: the compressor, evaporator, condenser, and the thermal expansion valve. These components are crucial in the refrigeration process.
The working principle of absorption refrigeration uses thermal energy as the driving force. It achieves cooling through the vaporization and heat absorption of the refrigerant, similar to vapor compression refrigeration. However, the difference lies in the compensation method used to transfer heat from low to high temperatures. Vapor compression refrigeration uses mechanical work, while absorption refrigeration uses thermal energy for compensation. Diagrams illustrating the working principles of both absorption and vapor compression refrigeration units are provided.
The working fluid in an absorption refrigerator is a binary mixture consisting of two substances with different boiling points (solution). The low-boiling-point substance is the refrigerant, and the high-boiling-point substance is the absorbent. The absorption refrigeration unit has two cycles: the refrigerant cycle and the solution cycle.
In absorption refrigeration cycles, common refrigerant-absorbent pairs include R22-DMF (chlorodifluoromethane-dimethylformamide), R22-E181 (chlorodifluoromethane-tetraglyme), and R22-DBP (chlorodifluoromethane-dibutyl phthalate). R22-DMF is advantageous at high generation temperatures and low condensation temperatures, while R22-E181 is more suitable for lower generation temperatures and higher condensation temperatures, such as in solar refrigeration systems.
Daily maintenance of refrigerated truck units:
Refrigerated truck refrigeration units require careful maintenance to extend the life of our refrigeration units and achieve better results. Here are the best daily maintenance methods for refrigeration units. The main maintenance of refrigeration units is from the following three aspects:
1. Refueling the refrigeration unit of the refrigerated truck
1. Connect one end of the refueling pipe to the refueling valve at the air inlet end of the compressor, open the refueling valve slightly, use the pressure in the system to discharge the air in the refueling pipe, and insert the other end into the oil barrel.
2. Appropriately close the system refrigerant supply valve and adjust the suction low pressure alarm setting to avoid stopping due to low pressure.
3. When the suction pressure is lower than the atmospheric pressure, open the refueling valve and the oil will automatically enter the compressor.
2. Refill refrigerant to the refrigeration unit of the refrigerated truck
1. Connect one end of the fluorine filling pipe to the system fluorine filling port and the other end to the fluorine bottle, and drive out the air in the pipe through the fluorine filling hose
2. Open the valve of the fluorine bottle first, and then open the valve at the fluorine filling port after confirming that there is no leakage
3. The R23 system should face the bottle mouth upward, while the R404A system should face the bottle mouth downward to ensure rapid fluorine filling
4. When fluorine filling is completed, the valve of the fluorine bottle should be closed first, and then the valve of the fluorine filling port
3. Release air from the refrigerator of the refrigeration unit of the refrigerated truck
1. The high-temperature system should be operated when the vehicle is parked, and the low-temperature system is best operated when the vehicle is running
2. The specific operation should be done carefully, the plug should not be opened too much, and it should not be far away from the site
3. The air operation should be carried out several times, and too much air should not be released at one time to avoid releasing excessive refrigerant.
