Guchen Thermo Transport Refrigeration Units

2022年5月24日星期二

Steps to Troubleshooting Refrigerated Truck Unit Issues

As is known to us all, an efficient transport refrigeration system is mainly composed of engine system, refrigeration unit, backup power and electrical control device. If the refrigeration compressor operates normally, but not cooling down, we conclude the reasons and troubleshooting methods as the following:

◆ The Filter is Blocked

The filter inlet has refrigerant, but there is no refrigerant leaking out when the outlet screw is loosened;

◆ The Thermal Expansion Valve (TEV) is Blocked

the manifestations are dirty blockage and ice blockage; Check whether the filter screen of the TEV is dirty. If yes, it should be cleaned and dried with nitrogen; if not, it should be cleaned with nitrogen too. When the temperature sensing bulb leaks, nitrogen cannot pass through the expansion valve, Then the TEV should be replaced in time;

If there is ice blockage during inspection, the entire truck refrigeration system must be dried with nitrogen to eliminate the ice blockage.

◆ TEV Adjustment

The TEV adjustment is too large or too small;

--Too large, the compressor runs wet, and the suction pressure is low;

--Too small, little frosting occurs;

Check whether there is a leak in the refrigeration system, and adjust the expansion valve to achieve the best cooling effect.

◆ Cooling Fan Issues

Check the evaporator fan motor fuse and load distributor, and replace it in time if damaged. Check whether the voltage of the evaporator fan and the motor is lower than 12V. If so, you should focus on checking the 12V alternator and load distributor; The speed of the evaporator fan motor is not enough, which means that the wind force is weakened and the air volume is small.

◆ Refrigerant Leakage

If there is a refrigerant leak, leak detection should be underwent. The inspection parts include: compressor shaft seal, high-pressure exhaust port, low-pressure air outlet connector, connection of other truck refrigeration parts, and pipeline welding. Refrigerant leakage can generally be checked with halogen lamps, electronic leak detectors and other equipment. But in actual work, most people use soapy water for leak detection. After the leak point is well-treated, it must be pressurized with nitrogen to 1.2MPa and kept for 24 hours. When the gauge pressure does not drop, it can be evacuated and the refrigerant can be injected.

◆ Lack of Refrigerant

Insufficient refrigerant is manifested as slow cooling. If the liquid in the sight glass is in an intermittent flow state, it is mainly because the suction pressure is low; The reason for the low high pressure and low pressure is the lack of refrigerant.

◆ Too Much Refrigerant

The reasons for both high pressure and low pressure are too much air, too much refrigerant, poor cooling effect of the condenser, and too much opening of the expansion valve. First observe whether there is frost on the low-pressure pipe, if there is frost, the opening of the expansion valve is too large. Rinse the condenser with water again. If the effect is obviously improved, the cooling effect of the condenser is poor. If there is no change, there is air in the system. What's left is too much refrigerant. If there are no air bubbles in the glass eyes when turning on and off the air conditioner, it can be determined that there is too much refrigerant. As long as you let out some refrigerant, the fault can be eliminated. During operation, the low pressure is sometimes a vacuum and sometimes normal, which can diagnose moisture in the system. To re-vacuum, it is necessary to replace the liquid storage dryer, and then refill the refrigerant; the low pressure always indicates the cause of the vacuum: the system is blocked, and the refrigerant does not circulate. Most of the expansion valves and liquid storage dryers are blocked, and they can be replaced. The low pressure is high and the high pressure is low, because the compressor itself is not good. Disconnect the low pressure pipe of the compressor and try to plug the high pressure pipe behind the pressure gauge. Start the engine and connect the 12V power supply to the electromagnetic clutch. If the pressure is lower than 15kg/cm2, the compressor is definitely broken. Generally, only the compressor assembly can be replaced.

◆ Dirty Evaporator and Condenser

The surface of the condenser is too dirty, causing blockage of the air passage, which is manifested as high exhaust temperature and poor condensation effect; clean the condenser to improve the condensation effect; the surface of the evaporator is blocked by carton dust or other dirt, and the cold air is blocked; clean the evaporator , remove dirt and reduce cold air resistance;

2022年4月21日星期四

Truck reefer system and refrigerated truck bodies play the most essential role in affecting the cooling efficiency of medium to large refrigerated trucks. Therefore, it is very important to strengthen their daily maintenance.

The main function of the refrigerating unit is to freeze and keep cargoes chill at the desired temperature. The cold air is distributed to all corners of the box truck, to ensure the stable and low temperature inside the vehicle and maintain the freshness of the transported products.

1. The truck refrigeration compressor keeps working for a long time. There are too many impurities in the compartment, which will cause the compressor to lock up and destroy the transport refrigeration system. For this reason, except for daily cleaning, the vehicle refrigeration unit generally takes the initiative to carry out a comprehensive maintenance after 2000 kilometers’ travelling.

2. Regularly check whether the refrigeration system is stable, adjust the refrigeration compressor belt and bracket in time, and replace the drier. Always check the circuit facilities inside the box to prevent the power cord from being damaged, exposed, or soaked in water, which will cause the wire to be disconnected.

3. Some hot lighting equipment is easily damaged and should be replaced in time. When the refrigeration unit is used for a short time in winter, or if the refrigeration unit is not used for many consecutive months for other reasons, it should be started and operated once a month, and each operation time is about 10 minutes.

The refrigerated body is composed of thermal insulation material polystyrene foam (or polyurethane foam and extruded polystyrene foam), glass fiber reinforced plastic (or aluminum alloy, color steel plate), and steel frame.

4. Usually pay attention to safe driving and parking to prevent the body from being squeezed and injured, which will affect the structural stability and thermal insulation effect of the car body. 5. The goods to be shipped should be handled with care to avoid damage to the inner surface caused by sharp goods or packing boxes.

5. Park your refrigerated truck in a shady place when it's hot in summer, and in a carport when it's raining. The surface of the refrigerated compartment body is easily contaminated with dirt, and the dirt and dust should be cleaned in time. If you wanna keep the normal operation of the TRU while the vehicle stops, you can add an electric standby system on it, more environment-friendly and fuel-saving.

6. The maintenance of the inner surface of the refrigerated truck is very important. The stains should be cleaned after each transportation task, especially the eight corners and the rear door. Scrub the seal with warm water to keep the seal elastic.

7. Do a good job in the temperature control to prevent the surface of the truck from freezing. The refrigerated food should be packaged and sealed as much as possible to reduce the evaporation of moisture into the interior of the box and the possibility of freezing inside.

8. If the inner surface of the refrigerated truck is frozen, it should be removed with a deicing shovel in time after unloading. Scrub the inside and outside surfaces of the freezer with a soft cotton cloth dipped in non-corrosive detergent, and then dry with a dry cloth. Do not use organic solvents, hot water, washing powder, etc. to clean. Remember to cut off the power before each cleaning.

9. When loading, the refrigerated truck must be pre-cooled or pre-heated. Because the vehicle is parked in an open-air parking lot, the general cabin temperature is the outside ambient temperature. If the temperature of the delivered goods is not the ambient temperature, and the goods are loaded into the compartment, the ambient temperature will affect the temperature of the delivered goods, resulting in changes in the quality of the delivered goods. Therefore, it is necessary to pre-cool the carriage to the required temperature before loading.

2022年2月14日星期一

Integrated Electric Standby for Refrigerated Trucks

Introduction of Integrated Electric Standby Refrigeration system

At present, the refrigeration system of most refrigerated vehicles relies on the vehicle engine to drive the transport refrigeration compressor to work, so as to achieve the purpose of refrigeration and food preservation. The compressor can only work when the vehicle is running. Once the engine is turned off, the refrigeration unit stops working. The electric standby system on the refrigerated truck is the second cooling power source activated when the engine of the chassis is not working or malfunctions. It can be used as a back-up refrigeration solution to solve some emergencies, and the refrigerated truck can also be used as a temporary cold storage.

Simply speaking, the vehicle powered refrigeration unit generally relies on the engine to drive the compressor of the refrigeration unit. After the engine is stopped, the refrigeration unit will stop working. If an integrated electric standby is installed, it can be directly powered after the engine is stopped. The truck refrigeration unit can still work afterwards, providing the preset refrigeration and fresh-keeping temperature for the truck compartment, so as to keep our goods fresh. The integrated electric standby system is more suitable for long-distance transportation, generally for refrigerated trucks over 7 meters.

Integrated Electric Standby System Composition

The electric standby system is composed of a motor, an independent compressor, an external power cord, and refrigerant pipeline, etc. It is independent of the original truck refrigeration compressor unit, but shares the same condensing system. Separate compressor for refrigeration, no need to start the vehicle. After the standby unit is installed, when the refrigerated vehicle engine stops working, through the electric standby system of the external power supply, the compressor can also be used when the vehicle is temporarily parked, broken down or repaired. Keeping the temperature in the compartment, and our goods fresh.

Working principle: Use the external power cord to rotate the motor, drive the independent compressor to work, and provide the circulating refrigerant for the refrigeration unit to work, without the chassis engine running.

Installation location: Generally, it is installed next to the beam of the refrigerated truck. It is also installed inside the box of a refrigerated truck, with a small side door open next to it.

Application: There are usually two models that are more suitable to be equipped with electric standby systems. One is a refrigerated truck used to transport temperature-sensitive cargoes to avoid abnormal cooling caused by the sudden condition of the vehicle's engine during transportation; the other is for refrigerated vans, short-distance cargo transportation. If you need to rest during transportation or during unloading, the integrated standby system comes into play. It can make the refrigerated van continue to supply the power required by the refrigerated truck unit through the backup compressor when the engine is stopped. The goods can be kept in a good condition in a constant temperature environment, and it can play a very good role in some goods with higher temperature requirements.

2021年12月8日星期三

How to Choose the Refrigeration Unit of Small Refrigerated Truck

As we all know, refrigerated vehicles are mainly composed of chassis, truck refrigeration system, and thermal insulation compartments. They are mainly used to transport temperature-sensitive food, such as frozen meat, vegetables and fruits. Multi-temperature zone refrigerated trucks are designed to take fully consideration of the characteristics of this kind of transportation. We can say that refrigerated vehicles occupy a certain proportion of short- and medium-distance logistics distribution.

Key Role of Refrigeration Unit in Maintaining the Desired Temperature of Perishable Goods

The refrigeration system is a critical part in the entire cold chain transportation. The refrigerated goods are very different from other ordinary goods . They have extremely strict requirements on temperature.

Therefore, when it comes to choose transport refrigeration units, you must have sufficient knowledge and understand the refrigeration manufacturer - your future business partner very well. Besides that, it is necessary to communicate with the supplier timely how to deal with some emergency situation.

In addition, when loading, you must first measure the temperature of the loaded goods. If the set point temperature of refrigeration unit kit is higher or lower than that of the cargoes, it is difficult to reach the temperature required for safe land delivery. The storage temperature of the frozen cargoes must be consistent with the transportation temperature. If its temperature changes frequently, the moisture will be lost, which will cause the quality of your products to change, and shorten the shelf life of the goods.

Types of Refrigerated Truck Refrigeration Unit

Truck refrigeration units are generally divided into two types.

One is independent refrigeration system;

It has a separate power source(an independent auxiliary engine, generator, and refrigeration compressor) and is able to operate independently. The operation state of the main engine has no effect on that of the transport refrigeration unit.

The purchase cost of independent refrigeration system is high. Therefore, those who are with insufficient budget can choose to buy split truck refrigeration unit which is low in investment.

the other is non-independent refrigeration unit;

Non-independent refrigeration units need to rely on the engine to drive the compressor to run, and there is no separate power unit to provide a source of power.

Selection of Refrigerated Truck Refrigeration Unit

According to the required temperature of cargoes transport, deep-frozen unit (also called as freezer unit) or chiller unit can be selected. From the point of view of price, deep-frozen truck unit is much more expensive than chiller systems as they can maintain the interior compartment temperature as low as -30℃. What should be noticed is that truck chiller units always have no defrost function.

So, how should the truck refrigeration unit be selected?

1. Box Truck Length

Due to the different requirements of cold chain transportation, there are different truck models and compartments available in the market. A refrigeration unit is not universal, and not suitable for all models.

If your truck body is below 6m with a volume in the range of 4-31m³, direct drive (nonindependent) refrigeration unit is a good alternative.

For refrigerated trucks with a body more than 6m, diesel powered (independent) refrigeration unit should be selected. Different refrigeration systems are with different cooling capacity which will directly affect its final refrigeration effect. Large truck model should be installed with a TRU with large cooling capacity.

In addition, there are different installation methods, such as rooftop installation, front mounted installation, to better adapt to the refrigerated vehicles.

2. Temperature requirements

Different goods have different temperature requirements, for example, the temperature setting of ice cream transportation should be -5° to -15°. Different temperatures correspond to different powers. When choosing a refrigeration unit , You can choose the suitable power according to the temperature demands.

Tip: Pre-cooling

You need to pre-cool the refrigerated truck. This step is very important. Under normal circumstances, it may take one hour and a half to pre-cool your truck cargo compartment.

3. Transport distances

Independent refrigeration units and non-independent ones have different power sources. Transport distance and time required for cold chain transportation should be considered when choosing a suitable system. Non-independent refrigeration units are suitable for short-distance transportation, and independent refrigeration units are more suitable for long-distance transportation. Choosing refrigeration units according to distance and time can save more power costs.

2021年1月12日星期二

Cold Chain: the key to India's agricultural growth

India is a surplus producer of many agricultural products. However, due to the lack of investment in cold storage, warehouses, processing equipment and exports, farmers in this country cannot get sustained high returns. For a country where most of the population depends on agriculture for their livelihoods, it is necessary to invest heavily in cold storage facilities. Due to the growth of retail, fast food, food processing and e-commerce industries, the Indian cold storage market is expected to grow at a rate of 16.09%. The cold storage market in India is worth at least US$8.57 billion. The recent amendments to India’s Basic Commodities Act removed restrictions on agricultural storage and improved the prospects of this key sector.

Cold storage is a key requirement for storage and distribution of perishable commodities and food after harvest. It facilitates the transportation of perishable agricultural products such as fruits, vegetables, meat, fish, poultry, milk and dairy products from production centers to consumption centers. The storage time of the product at room temperature is short, ranging from a few days to several weeks, while the storage time at the freezing temperature ranges from a few weeks to several months. Frozen food is very popular and is considered to be the closest to fresh produce, and is more popular than other types of preservation techniques. Perishable agricultural products are stored in cold storage shortly after harvest, regardless of whether they have been pre-treated or processed.

For the cold chain, cold storage facilities are the core of the business. In addition to storage, the supply chain also includes refrigerated transportation, distribution, and retail display infrastructure, eventually reaching every household refrigerator. Most perishable agricultural products and foods go through an end-to-end cold chain link before reaching the end consumer.

In developed countries, more than 90% of perishable agricultural products and foods have gone through a wide range of integrated cold chains, minimizing losses in food quality or price. In developing countries like India, most perishable agricultural products and food face high losses and waste due to insufficient cold storage and cold storage chains. According to reports from India, the post-harvest losses of agricultural products are huge, causing at least 100,000 rupees in economic losses every year. So at present, the Indian government has made the cold chain a priority area of investment and announced a plan to provide financial assistance to private investors in the form of subsidies, 35% in the general area and 50% in the Northeast.

In India, about 75% of cold storage is a single-commodity warehouse, used to store potatoes and potato seeds. Storage of other vegetables and fruits still faces severe shortages. Since the storage infrastructure and technology are capital-intensive, the storage cost of 5000 tons capacity is as high as Rs 5 crore, so it is ideal to establish public storage facilities that can be leased to manufacturers, producer groups, traders, processors and exporters s Choice.

The increasing demand for frozen commodities has led to the expansion of the cold storage market and transport refrigeration system. The cold storage industry in agriculture is bringing various business opportunities to farmers and the entire economy. Therefore, if India is to become a self-reliant economy, it must rely on a strong cold storage industry, which will play an extremely important role.

Types of cold chain links:

1. Independent operation of cold storage;

2. The cold chain link from the farm to the cold storage;

3. The cold chain link from the cold storage to the final consumer;

4. As part of the integrated cold chain, it has a front-end plus back-end link;

The action decomposition of the cold chain:

1. Back-end integrated cold chain: pre-cooling, packaging, small cold storage facilities, from farm to cold storage

2. Front-end integrated cold chain: refrigerated trucks, large-scale cold storage facilities, ripening rooms, from cold storage to retail or consumer packaging

3. A fully integrated cold chain will include a combination of 1 and 2 above

Guchen Thermo Transport Refrigeration system

https://www.guchenthermo.com

Main products:

◆ Refrigeration Units:
truck refrigeration unit
van refrigeration unit

◆ chiller units:
truck chiller unit
van chiller unit

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