International conference on construction engineering and project management (국제학술발표논문집)

  • 2024.07a
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  • Pages.1002-1009
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  • 2024
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  • 2508-9048(eISSN)
Korea Institute of Construction Engineering and Management (한국건설관리학회)
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Simulated Analysis on Cooling System Performance Influenced by Faults Occurred in Enthalpy Sensor for Economizer Control

  • Minho KIM (Department of Building and Plant Engineering, University of Hanbat National) ;
  • San JIN (Department of Building and Plant Engineering, University of Hanbat National) ;
  • Ahmin JANG (Department of Building and Plant Engineering, University of Hanbat National) ;
  • Beungyong PARK (Department of Building and Plant Engineering, University of Hanbat National) ;
  • Sung Lok DO (Department of Building and Plant Engineering, University of Hanbat National)
  • Published : 2024.07.29
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Abstract

An economizer control is used for cooling a building by modulating outdoor air(OA) intake rate according to measured OA conditions. An OA enthalpy sensor can be faulty during the operating after installation. The sensor mainly is fault in the form of offset. It leads value differences between measured enthalpy and actual enthalpy. The enthalpy differences occurred by the faulty sensor may result in more OA intake or less OA intake than designed OA intake value. The unwanted amount of OA intake negatively affects cooling system performance, especially cooling energy consumption. Therefore, this study analyzed cooling system performance resulted from occurring the faulty sensor in economizer enthalpy control. To conduct the analysis, this study utilized the Fault model in EnergyPlus, a building energy simulation tool. As a result of the analysis, the faulty sensor with positive offset intaked less OA amount than the available OA amount. It lead more cooling energy consumed by cooling equipment such as chiller and circulation pump. On the other hand, the faulty sensor with negative offset intaked more unnecessary OA amount than the required OA amount. It also lead more cooling energy consumption in the cooling equipment. Based on the resultant analysis, this study suggests continuous maintenance and diagnosis for an enthalpy sensor used in the economizer system. It may allow proper operation control for the economizer system, and thus the maximum cooling energy saving can be achieved.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT).(No. 2021R1C1C1010231).

References

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