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A modeling study on the operational stability of a variable speed direct expansion air conditioning system.

Number: pap. 2031

Author(s) : XIA Y., DENG S.

Summary

This paper reports on a modeling study on the operational stability of an electronic expansion valve (EEV) controlled variable speed (VS) direct expansion (DX) air conditioning (A/C) system. An existing detailed, physical based dynamic model for a VS DX A/C system was further developed by adding equations for EEV’s temperature sensor. Using this further developed model, a modeling study on the stability of a VS DX A/C system based on the classical minimal-stable-signal (MSS) theory was carried out. The influences of the dynamics of EEV’s temperature sensor and the variable speed operation on the operational stability of the VS DX A/C system were investigated. The modelling results suggested that slowing down the rate of degree of superheat (DS) signal transfer would help mitigate the instability, while increasing the compressor speed or decreasing the supply fan speed would cause the movement of a mixture-vapor transition point towards evaporator exit, leading to potential instability of the VS DX A/C system.

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Pages: 9 p.

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Details

  • Original title: A modeling study on the operational stability of a variable speed direct expansion air conditioning system.
  • Record ID : 30018807
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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