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Cooling capacity demand-induced cooperative control strategy of variable evaporating temperature and superheat in a VRF system.

Number: 0226

Author(s) : CAO H., ZHUANG D., LEI J., DING G., HUANG Z., LI S., LI J., ZHANG H.

Summary

A variable refrigerant flow system has the advantage of controlling multiple indoor units simultaneously so it has been widely applied in commercial and residential buildings. In existing VRF systems, evaporating temperature and superheat are controlled to be constant, resulting in obvious temperature fluctuation and large energy consumption. In order to improve indoor temperature stability and energy efficiency, a cooperative control strategy of variable evaporating temperature and superheat is developed in this study. The evaporating temperature is raised according to the maximum cooling capacity demand and the superheat of each indoor unit is continuously regulated. The proposed control strategy is applied in a VRF system instead of a common control strategy, and an environmental laboratory is built to verify the temperature control accuracy and power consumption. Experimental results show that room temperatures are all controlled within ±0.5 °C of set values, and power consumption is reduced by 51% at most.

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Pages: 14 p.

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Details

  • Original title: Cooling capacity demand-induced cooperative control strategy of variable evaporating temperature and superheat in a VRF system.
  • Record ID : 30031713
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0226

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