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Fundamental optimal performance design guidelines for off-set type reciprocating compressors to maximize mechanical efficiency.

Number: pap. n. C9, 1358

Author(s) : TSUJI T., ISHII N., ANAMI K., et al.

Summary

Optimal design guidelines for reciprocating compressors, one of the earliest classical compression devices, are less well developed. This paper first provides a review of the optimal design guidelines for rotary and scroll compressors. Then subsequently a parametric computer simulation study of the mechanical efficiency of compact off-set type reciprocating refrigerant compressors is presented. From the computer simulations, fundamental optimal performance design guidelines for maximum mechanical efficiency are identified. The frictional power loss at each pair of compressor elements depends mainly upon the corresponding constraint force. The constraint forces depend not only upon the compression pressure and the inertia forces but also upon the combination of piston diameter and stroke for a given suction volume. The suction volume for a given reciprocating compressor is determined by these major parameters. Consequently, there are many combinations of major parameters that result in a reciprocating compressor with the same suction volume. Therefore, the constraint force and the frictional power loss at each element pair change, depending upon the selected combination of major parameters, thereby resulting in a different mechanical efficiency. Thus, selection of the optimum combination of major parameters is necessary to ensure maximum mechanical efficiency of the reciprocating compressor. The mechanical efficiency of a small capacity reciprocating compressor with a variety of piston off-set was calculated, where the combination of piston diameter and stroke was varied for a fixed suction volume. The calculated results indicate that there is an optimum combination of these major parameters. In addition, the physical basis for the optimum combination of major parameters was examined by showing the characteristics of the frictional power loss at each element pair.

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Pages: 10 p.

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Details

  • Original title: Fundamental optimal performance design guidelines for off-set type reciprocating compressors to maximize mechanical efficiency.
  • Record ID : 30001341
  • Languages: English
  • Source: 2010 Purdue Conferences. 20th International Compressor Engineering Conference at Purdue.
  • Publication date: 2010/07/12

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