At present, the truck engine is the most efficient and ecologically compatible drive source for transport refrigeration machines. Modern truck diesel engines need up to 50% less fuel and have an efficiency of over 45 % (compared with 20 % to 25 % of diesel-powered refrigeration machines). At approximately 0.2 l/kW refrigeration capacity per hour, alternator refrigeration machines consume about 50 % less fuel than a diesel refrigeration machines and so emit over 50 % less CO2


The FRIGOBLOCK alternator efficiency exceeds 90 %. By comparison, hydraulic drive systems have efficiencies of only between 65 % and 75 % due to mechanical, hydraulic and volumetric energy loss. The efficiency is even lower in part-load mode and at high or low temperatures.

External evaporators provide up to 2.5 m³ more effective loading space because without internal evaporator the space can be used for loading goods right to the bulkhead. The hydraulic tilting mechanism with only 30 mm distance to the driver’s cab reduces the total height of the body by about 300 mm. Consequently, less body surface is exposed to wind attack, which works out in lower fuel costs. Also the lower body height is responsible for less warm air entering the loading space when the doors are opened, and heat-sensitive surfaces are reduced.

Cost savings – inverter technology

The electricity for the refrigeration system is supplied by the FRIGOBLOCK alternator. Like an electric generator, the alternator is integrated in the belt drive of the truck engine. As the truck engine speeds up, the rotary frequency of the alternator in conventional systems also increases. This makes the frequency of the electricity variable. In conventional systems, the rotary frequency of the alternator is transferred to the downstream components (fans, electric motors for compressor, etc.) without change. Consequently, the refrigeration capacity of the system changes when the engine speed changes. To maintain a constant refrigeration capacity and reduce loss, the speeds of the components should be as constant as possible and maintained at a point of optimum efficiency.

So called ”i-machines“ use inverters for this. The electricity supplied by the alternator is stored in a buffer circuit and provided to the downstream components at the load point of optimum efficiency.

FRIGOBLOCK-Kältehybrid-Inverter-Technologie bietet:
  • Variable Drehzahlregelung aller Motoren
  • Kostenlose Kälteerzeugung im Brems-/Schubbetrieb
  • Nutzung der Ladung als kostenloser Energiespeicher
  • Automatische Korrektur der Solltemperatur im Verteilerverkehr
  • Modus für geräuscharme Nachtanlieferung
  • Modus für minimalen Energieverbrauch
  • Modus für maximale Abkühlgeschwindigkeit

The variable speed control of the motors enables compressors and fan motors to operate at low but constant speed at the optimal load points. As a result of this, noise emission is low, electric machines have low loss rates and the component life is extended.
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