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Automatic test stand to impose operating suction and discharge conditions on compressors.

Number: 1443

Author(s) : MONTIBELLER C., THALER G., FLESCH R. C. C., MACHADO J. P. Z., LUDWIG G. H.

Summary

This work describes the control algorithms used for automating a test stand to impose suction and discharge pressures and suction temperature on reciprocating compressors, allowing the operation to be evaluated under different conditions within the compressor envelope. Since the objective is to impose conditions on the compressor, a superheated gas cycle was considered. In addition, an auxiliary circuit was considered, which is responsible for cooling the fluid as it passes through the reservoir in the intermediate region of the main circuit. This auxiliary system is particularly important to achieve low discharge pressure conditions even after the compressor under test has been operating for a long time. To reach the entire operating envelope of several compressor models, an automatic procedure is proposed to insert and remove the refrigerant fluid from the test stand. For this purpose, a reservoir tank was connected through solenoid valves to both the discharge and service lines, making it possible to control the volume of fluid in the main circuit. The dynamics of the variables of interest were identified using experimental data and the resulting models were used to tune automatic controllers for imposing the compressor operating condition in terms of pressures and temperature. The current version of the test stand is able to automatically impose any condition inside the operating envelope of a family of compressors and keep the compressor operating around this point with tolerances of less than 1°C.

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  • Original title: Automatic test stand to impose operating suction and discharge conditions on compressors.
  • Record ID : 30033617
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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