Étude de simulation sur la stabilité opérationnelle d'un système de conditionnement d'air à détente directe contrôlé par un détendeur électronique (EEV) fonctionnant à vitesse variable

Translated title of the contribution: A simulation study on the operational stability of an EEV-controlled direct expansion air conditioning system under variable speed operation

Yudong Xia, Qiang Ding, Shu Jiangzhou, Xuejun Zhang, Shiming Deng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

Hunting causes a poor operational safety and efficiency of a direct expansion (DX) air conditioning (A/C) system when it is variable speed (VS) operated to output different sensible and latent cooling capacities. An existing dynamic model was further developed by adding the equations for evaluating temperature sensor dynamics and air side operating parameters. After experimentally validated the model, the temperature sensor dynamics and VS operation on stability were numerically examined. Simulation results showed that due to the temperature sensor dynamics, actual system hunting could be much more serious than what was measured, and increasing the thermal resistance between temperature sensor and refrigerant pipeline would mitigate hunting. The mixture-vapor transition point in the DX evaporator would move closer to its exit at a smaller output equipment sensible heat ratio (E SHR) or a larger output total cooling capacity (TCC), consequently, leading to a higher chance to instability.

Translated title of the contributionA simulation study on the operational stability of an EEV-controlled direct expansion air conditioning system under variable speed operation
Original languageFrench
Pages (from-to)115-125
Number of pages11
JournalInternational Journal of Refrigeration
Volume103
DOIs
Publication statusPublished - Jul 2019

Keywords

  • DX A/C system
  • Operational stability
  • Sensible heat ratio
  • Sensor dynamics
  • Variable speed

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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