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The effectiveness of using total system power for fault detection in rooftop units.

Number: pap. 2627

Author(s) : HJORTLAND A. L., BRAUN J. E., GORBOUNOV M.

Summary

Previous research has been presented that suggests using instantaneous system power measurements to perform fault detection for rooftop units. The methodology involves generating a normal system power model using measurements of system power and outdoor-air temperature, which are then used to determine if system performance has deviated due to the presence of faults. In order to evaluate the viability of this approach, the current work presents data collected from several rooftop units subjected to different faults and ambient conditions using psychrometric chamber test facilities. The results of the testing show that total system power is not very sensitive to many common faults affecting direct-expansion air-conditioning equipment. As a further evaluation step, the fault detection methodology is applied to 5 RTUs serving a restaurant. The results of this indicate that due to the expected uncertainty in the modeled power consumption of each unit, fault detection thresholds may not be sensitive enough to detect common faults. Ultimately, the sensitivity of steady state power consumption to most faults is not sufficient given the measurement uncertainty observed and may lead to unreliable fault detection performance.

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Pages: 12 p.

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Details

  • Original title: The effectiveness of using total system power for fault detection in rooftop units.
  • Record ID : 30018794
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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