What is Transport Refrigeration Unit (TRU)?

“TRU” means transport refrigeration units. It is a medium temperature or low temperature transport refrigeration system removing heat and maintaining a steady temperature for frozen and refrigerated goods during transport or storage. It is installed on insulated vans, cargo trailers, trucks, intermodal shipping containers and rail cars. TRUs can be found in different sizes and different locations. It depends on different types of transport carrying the goods.

Transport Refrigeration Unit

Van transport refrigeration unit

Van Refrigeration Unit

Truck refrigeration unit

Truck Refrigeration Unit

Trailer transport refrigeration unit

Trailer Refrigeration Unit

Know more of the transport Refriegration Unit......

Glen Refrigeration
  • Van refrigeration unit is used to refrigerate insulated vans mounted on the rooftop of vans. It is roof mounted refrigeration unit. According to different temperature, it has van chiller unit and van freezer unit.
  • Truck refrigeration unit is used to refrigerate insulated cargo van mounted on the frame of trucks. According to different temperature, it has truck chiller unit and truck freezer unit.
  • Trailer refrigeration unit is used to refrigerate insulated trailers mounted on semi trailers.

How does a transport refrigeration unit work?

A conventional transport refrigeration unit uses the engine-driven compressor (also called belt driven compressor). The truck or trailer runs off the main diesel engine to drive the compressor while on road, when the truck or tailer is parked, loading, or unloading, the TRU can continue to be powered by the main engine or run off a separate standby engine. Because it use diesel duel all the time, it has direct impact on the air quality and not good for the environment.

Transport refrigeration system

What is an Electric Transport Refrigeration Unit (e TRU)?

“e TRU” stands for electric transport refrigeration unit. Nowadays, electric transport refrigeration units (e TRU) are used to replace conventional diesel powered TRUs by many people. It is including standby electric e TRU, and all-electric e TRU. In an electric transport refrigeration unit, the transport refrigeration compressor is driven by an electric motor all the time or at least part of the time. Powering the compressor with electricity offers not only environmental benefits, but also increases efficiency, and lower maintenance requirements. 

Standby transport refrigeration unit

Standby/Hybrid TRU

All electric transport refrigeration unit

All-electric TRU

What are benefits of Electric Transport Refrigeration Unit?

Maintain a steady temperature when parked

The electric transport refrigeration system can operate the compressor by a plug-in electrical grid power while the engine isn’t running. The first benefit is drivers can maintain a steady temperature to keep the products cool without running the engine. Plus, the trucks are quieter; it creates a quieter environment for drive also people around.

Plug-in standby transport refirgeration unit

Reduce the carbon emissions

The main benefit of an electric refrigeration system for truck reefers is more fuel saving and emission reductions. The conventional transport refrigeration units are still powered by the engine when stationary, while the electric standby transport refrigeration units are powered by a plug-in electrical grid power (also called shore power). So the electric standby TRUs reduces the carbon emissions due to the reduction of the use of the diesel fuel.

Reduce the carbon emissions

Require less maintenance

The electric standby TRUs uses the engine-driven compressor when transit, which use the transport rotary refrigeration compressor when parked. The all-electric TRUS uses the dc rotary compressor or dc scroll compressor all of the time. So it uses fewer parts and requires less maintenance than their diesel counterparts. Eliminating the use of your engine also lengthen the total life of your truck.

Electric transport refrigeration unit less maintenance

What is Standby/Hybrid TRU?

The electric standby transport refrigeration units are also called hybrid TRUs. It has two compressors in the refrigeration system. One is engine-driven compressor; the other is rotary refrigeration compressor. When over the road, the unit with engine-driven compressor is powered by diesel engine; when parked, loading or unloading, the electric standby unit allows the TRU to be plugged into electrical power to drive the transport rotary refrigeration compressor and the diesel engine to be turned off.

How to Power Standby/Hybrid TRU?

The electric standby transport refrigeration units are also called hybrid TRUs. It has two compressors in the refrigeration system. One is engine-driven compressor; the other is rotary refrigeration compressor. When over the road, the unit with engine-driven compressor is powered by diesel engine; when parked, loading or unloading, the electric standby unit allows the TRU to be plugged into electrical power to drive the transport rotary refrigeration compressor and the diesel engine to be turned off.

Van transport refrigeration unit (2)

What kind of Electric Compressor is Used in Standby/Hybrid TRU?

The standby transport refrigeration system uses two compressors; one is belt-driven compressor, the other is rotary refrigeration compressor. The transport rotary refrigeration compressor used in standby/hybrid TRU is horizontal type. The horizontal structure makes the rooftop refrigeration units low height and compact size. According to different voltage, we have 220V~240V/50HZ, 220V/60HZ, 380V/50HZ and 220V DC refrigeration compressors. The cooling capacity is ranging from 0.75HP to 3HP.

  • 220V~240V/50HZ transport refrigeration compressor
  • 220V/60HZ transport refrigeration compressor
  • 380V/50HZ transport refrigeration compressor
  • R404A variable speed refrigeration compressor
  • R410A variable speed refrigeration compressor
  • R290 variable speed refrigeration compressor

What is All-electric Transport Refrigeration Unit?

The electric transport refrigeration unit is driven by all electric, not by diesel engine. It uses electric dc compressor, for example, 12V dc compressor, 48V dc compressor, 320V dc compressor. When transit, the dc compressor is powered by onboard batteries. The batteries can be charged with rooftop solar panels as well as a generator that is built into the trailer for additional charging power. When parked, the dc compressor is powered by plugging in to grid power to fully recharge the onboard batteries.

How to Power the All-Electric Transport Refrigeration Unit (e TRU)?

The all-electric transport refrigeration unit uses the 12V dc compressor or 48V dc compressor or 320V dc compressor. When over the road, the all-electric transport refrigeration unit is powered by batteries directly for shorter distance; for longer distance, it is equipped with a diesel-powered TRU generator set while operating on the road.

When parked, the van engine is off, the all-electric transport refrigeration unit will not last long for refrigerating. It is better to equip with an extra transformer, which can transform the AC power to 12V dc power or 48V dc power to drive the rotary refrigeration compressor. At same time, charge the vehicle batteries.

All-electric refrigeration unit

12V DC Compressor

The largest cooling capacity and highest efficiency 12 volt dc compressor. If you are looking for a large cooling capacity 12v dc air conditioner compressor, the model JFSB150Z12 is the best choice.

  • Product: 12v air conditioner compressor
  • Model: JFSB150Z12
  • Refrigerant: R134A
  • Power supply: DC 12V
  • Capacity: 2100W (at speed 3600RPM)
  • Input power: 725W (at speed 3600RPM)
  • Current: 62.4 A (at speed 3600RPM)
  • Speed range: 900~4000RPM
  • Dive (or controller): Available

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Features:

  • High cooling capacity. The model JFSB150Z12 is the largest cooling capacity 12 volt dc air conditioner compressor. The cooling capacity of JFSB150Z12 is 2100W at speed 3600 rpm.
  • Low input power. The input power of 12v ac compressor JFSB150Z12 is only 725W at speed 3600 rpm. The lower input power, the more energy saving. That also means same capacity battery, the 12 volt ac compressor JFSB150Z12 saves more energy and runs continuously for longer time.
  • Small current. Compared with same cooling capacity dc scroll compressor, the dc inverter rotary compressor JFSB150Z12 has smaller current. It means more energy saving and much safer.
  • Compact size. The horizontal structure reduces the height of 12v dc ac compressor, makes the rooftop air conditioner more compact.
  • Low vibration and noise. The 12 volt dc ac compressor JFB150Z12 is a dual inverter compressor, which makes the compressor running more stable. At same time, the vibration and noise are greatly reduced.

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