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Development of dynamic model of variable refrigerant flow cooling system based on moving boundary method.

Number: 0531

Author(s) : HONG J. K., JOO H., KIM M. S.

Summary

The use of variable refrigerant flow (VRF) cooling and heating systems is gradually expanding, but the development of system dynamic models for optimal operation and fault diagnosis is still in the research stage. Therefore, in this study, we tried to develop a dynamic model of the entire VRF system by modeling the heat exchanger using the moving boundary method. A dynamic model development method for heat exchangers, a receiver, and an accumulator with dynamic variables was presented. In addition, modelling method of shut-down and start-up process in indoor units was also presented. Based on these models, the entire VRF system model was completed by combining static models for components such as compressors. Combining the thermal zone model with the VRF system model, the indoor unit on/off operation of the VRF system was simulated for 2,400 s. The simulation results showed that the developed model simulated the actual VRF system similarly, although there were some errors. However, if the accuracy of the model is increased using actual experimental results in the future, it is expected that the developed model can be used to perform optimal control of the actual VRF system.

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Pages: 9

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  • Original title: Development of dynamic model of variable refrigerant flow cooling system based on moving boundary method.
  • Record ID : 30033273
  • Languages: English
  • Source: 14th IEA Heat Pump Conference 2023, Chicago, Illinois.
  • Publication date: 2023/05

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