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1.Difference between diesel powered refrigeration unit and engine driven refrigeration unit
Diesel powered refrigeration unit: Independent and non-independent refrigeration units are divided according to power source. Independent refrigeration unit (Diesel powered refrigeration unit) means that the refrigeration unit has a separate power source and the unit itself has an independent power source.
Generally speaking, diesel powered reefer unit is integrated structures, but there are also modified split structures (this structure is generally hoisted on the beam of the reefer truck). This type of unit itself has an engine and a generator that provide power and electricity to the refrigeration system Device. It can work independently without being restricted by the working state of the truck engine.
Non-independent refrigeration unit (Engine driven refrigeration unit😞 As the name implies, it is a refrigeration unit that cannot work independently. This type of unit has no power unit and must rely on the truck engine to drive the compressor to work.
The engine driven refrigeration unit can also be divided into an integral structure and a split structure from the structure. The split structure also includes three types of condenser front type, condenser top-mounted type and condenser bottom-mounted type (bottom-mounted or concealed); but the condenser front-mounted structure is the most common structure in split non-independent refrigeration units.
2.Advantages and disadvantages of diesel engine refrigeration unit and engine driven refrigeration units
Independent refrigeration unit
Advantages: The advantage of diesel engine refrigeration unit is stability and reliability, which is also the most needed for refrigerated trucks. Since the diesel engine refrigeration unit has a separate source of power output, the refrigerator can still work when the refrigerated vehicle is turned off or the refrigerated vehicle has an engine failure, so as to ensure that the goods in the refrigerated vehicle will not deteriorate.
Integrated independent refrigeration unit
Disadvantages: The disadvantage of independent refrigeration units is that they are expensive and maintenance is more complicated than non-independent refrigeration units. Due to the addition of a set of power systems, independent refrigeration units are more complicated than non-independent refrigeration units in terms of maintenance, and independent refrigeration units are relatively more technically complex and more expensive.
Non-independent refrigeration unit
Advantages: The advantages of non-independent refrigeration units are low price, simple structure and easy maintenance.
Disadvantages: The disadvantage of the non-independent refrigeration unit is that it relies too much on the power source of the refrigerated vehicle. When the refrigerated vehicle engine stops working, the non-independent refrigeration unit loses power support and the refrigeration system stops working. If the door is frequently opened when the vehicle is turned off, the large loss of cold air in the refrigerated box causes the temperature in the box to rise, or the refrigerator will stop cooling when the vehicle fails (engine failure), and the cargo in the vehicle is easily lost.
3.Choice of independent refrigeration unit and non-independent refrigeration unit
From the price point of view: If your budget is relatively sufficient and have strict temperature requirements (the required temperature should be at least minus 10 degrees below) ) It is recommended to use a diesel powered refrigeration unit.
In terms of the length of transportation distance: For short-distance distribution within the city or between districts and counties, it is recommended to use non-independent units, which not only lower the procurement cost, but also easy to repair even if there is a failure; For long-distance transportation, it is recommended to use independent refrigeration units, because Even if the vehicle engine stops working during long-distance transportation, the refrigerator can still cool normally to ensure the safety of the transported items.
In terms of vehicle models: Generally speaking, light trucks with a body less than 7 meters are recommended to use non-independent units. For trucks and semi-trailers above 7 meters, independent refrigeration units are better.
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Small refrigerated vans are mainly used for temperature-sensitive items such as food or medicine, so temperature is the key to small refrigerated vans. If the temperature is not adjusted properly, the goods will not be stored or transported in a perfect state. The following are 8 maintenance tips for refrigerated delivery van.
1. Before driving, check whether the oil used in the refrigerated van is sufficient, and the oil can reach the destination smoothly.
2.Check that the battery is connected well, make sure that the wire connecting the battery is not damaged, and remember to check whether the electrolyte is sufficient.
3. Before driving a s refrigerated van, check whether there are any parts that are not tightened or other problems. If there are any problems, you must first eliminate the fault before driving on the road.
4. make sure that the drainage device is unobstructed.
5. When loading goods, remember to keep the goods away from the air outlet of the evaporator, so that the cold air in the cargo box keeps circulating, and there is no place where air-conditioning cannot be obtained.
6. Check whether the coolant is correct. The pointer of the liquid level meter should be within the normal range. If the refrigerating liquid is insufficient, the refrigerating liquid should be refilled in time.
7. Adjust the seat belt to the extent that it is not loose or tight.
8. Check whether the electrical and wire connections are stable. Whether the wires are cracked or damaged.
During our normal use, the maintenance are also inseparable. The refrigeration unit is maintained according to the working hours of the engine. The maintenance time of small refrigerated van units is 500-700 hours. It needs to be replaced, air filter element, oil filter element, fuel filter element, and check the tightness of the belt, whether there is leakage in the refrigeration system, etc. However, in order to meet the needs of environmental protection, some brands of refrigeration units try to reduce the damage to the environment and reduce the emission of harmful substances. Therefore, synthetic engine oil or semi-synthetic engine oil is used to replace ordinary engine oil, thereby extending the maintenance time of the engine. Do maintenance once every 2000 hours.
By Auto News
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