IIR document

Partial load test protocol, a way to move ahead for efficiency measurement in transport refrigeration.

Number: pap. 214



Fuel burn, or energy consumption, impacts the environment as well as the profitability of the European road transport refrigeration sector and is of significant importance. Several approaches to establish regulations in this area demonstrate that there is a lack of necessary test data. In this paper we will address the relationship between the energy efficiency and the energy consumption of the transport refrigeration unit. At present for these types of systems, the use of official ATP test data established under controlled ambient temperature according to the ATP rules (an international agreement for transport of perishable foodstuffs supported by the United Nations), can give only a partial answer regarding the energy efficiency of the marketed products. This test protocol measures the fuel burn of the refrigeration unit in steady state conditions, which are considered very close to full load data. But full load test data appears only when the refrigeration unit is pulling down the inside air temperature of the trailer or box, or during the delivery cycle, when the refrigeration unit has to cool down the ambient air that entered into the trailer body during multiple door openings. The temperature recorded in actual usage demonstrates that for most of the time, the transport refrigeration system operates in partial load to compensate only for the thermal losses of the trailer body. Based on new standards already in development in Europe, this paper will explain how partial load tests can be performed in standard calorimeter tests rooms, and will present data obtained from independent and dependent refrigeration units. The limits of the usage of this data for modeling the global energy consumption of the refrigerated truck or trailer will be highlighted.

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Pages: 8 p.


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  • Original title: Partial load test protocol, a way to move ahead for efficiency measurement in transport refrigeration.
  • Record ID : 30012115
  • Languages: English
  • Source: 3rd IIR International Conference on Sustainability and the Cold Chain. Proceedings: London, UK, June 23-25, 2014
  • Publication date: 2014/06/23


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