1. How is cargo chilled?
2. How is cold generated?
3. What is the energy source?
4. What happens in the load?


Blue line
A correctly specified refrigeration machine ensures that the critical temperature in the loading space is controlled. At first, the diagram shows the cooling behaviour when the door is closed. When it is opened, heat enters the loading space and the temperature rises quickly. A good refrigeration machine must be able to cool down the air within a very short time.

The gradient of the cooling curve is a measure for the cooling rate. It can be seen that the temperature does not cross the critical point (red line).

Grey line
If the refrigeration machine is too small i.e. insufficient refrigeration capacity, evaporator and condenser surfaces too small then the target temperature in the truck body cannot be reached. If the door is opened several times, the entry of warm air causes the temperature to rise quickly and the critical temperature limit is crossed. The appliance cannot re-cool the loading space below the critical temperature.

As a consequence of this, the goods warm too much and more germs form. The goods may suffer damage and health risks for end customers / consumers cannot be excluded.
The correct configuration of your machine is described in refrigeration-demand-calculation.

The following information is critical to the design of the refrigeration machine:
  • Frequency and duration of open doors
  • Outside temperature
  • Body size
  • Body insulation
  • Temperature and thermal capacity of the transported goods
  • Ability of the appliance to cool / heat the loading space to the required temperature quickly
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