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Saving energy on the low-pressure side.

Energiebesparing aan de lagedrukzijde.

Author(s) : SUMMERER F.

Type of article: Article

Summary

There are various options for saving energy on the low-pressure side of a refrigerating plant. But reducing the impellent temperature difference by enlarging the evaporator does not always lead to the desired results. Particularly in the positive range where you can assume high COP values and no electrical defrost energy is required, the power consumption of the evaporator fan plays a considerable part so that a bigger evaporator that is fitted with a more powerful fan can lead to higher energy consumption in spite of reducing the temperature difference. If, however, the evaporator is optimized for a smaller temperature difference, the larger evaporator could pay for itself after one year. It is not possible to make a sweeping statement on selecting the right evaporator. Rather this must be checked for each individual case. Small temperature differences on the evaporator can either be achieved using electronic expansion valves or by combining a suction gas heat exchanger with a special thermostatic expansion valve that is available from Güntner for evaporator outputs of up to 15 kW. With additional extensions such as air rectifiers, you must ensure that they do not create any drop in pressure during operation. If you exhaust all the energy saving potentials, then 10-20% of energy can be saved by optimizing the low pressure side.

Details

  • Original title: Energiebesparing aan de lagedrukzijde.
  • Record ID : 2008-0968
  • Languages: Dutch
  • Source: Koude & Luchtbehandeling - vol. 100 - n. 11
  • Publication date: 2007/11

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