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Optimisation of expansion valve control in small refrigeration appliances under cyclic operation.

Number: pap. 2496

Author(s) : BEEK M. van, JONG H. D.

Summary

For small refrigeration appliances, capillary tubes are typically applied as expansion device and compressor cycling is used to control product temperature. During the initial minutes after compressor start, the evaporator area is relatively poorly used, resulting in low system efficiency. Improving the evaporator filling during this initial stage improves cycle efficiency. The current status of an ongoing study is presented outlining the development of a control method for expansion devices in small commercial refrigeration systems. The objective of the study is to improve system efficiency via the control of the expansion device. A provisional control strategy, based on the use of an electronic expansion device with closing valve functionality, is presented and its impact on the cooling system design is discussed. Preliminary validations, using a dedicated test set-up, showed a reduction in energy consumption of 17% for a subcritical (R404A) and 15% for a transcritical (R-744) cooling system of a vending machine in comparison to its benchmark capillary based system.

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Pages: 10 p.

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Details

  • Original title: Optimisation of expansion valve control in small refrigeration appliances under cyclic operation.
  • Record ID : 30018761
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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