Fault detection algorithm for multiple-simultaneous refrigerant charge and secondary fluid flow rate faults in heat pumps

Samuel Boahen, Kwesi Mensah, Selorm Kwaku Anka, Kwang Ho Lee, Jong Min Choi

Research output: Contribution to journalArticlepeer-review

Abstract

The detection and diagnosis of faults is becoming necessary in ensuring energy savings in heat pump units. Faults can exist independently or simultaneously in heat pumps at the refrigerant side and secondary fluid flow loops. In this work, we discuss the effects that simultaneous refrigerant charge faults and faults associated with the flow rate of secondary fluids have on the performance of a heat pump operating in summer season and we developed a correlation to detect and diagnose these faults using multiple linear regression. The faults considered include simultaneous refrigerant charge and indoor heat exchanger secondary fluid flow rate faults (IFRFs), simultaneous refrigerant charge and outdoor heat exchanger secondary fluid flow rate faults (OFRFs) and simultaneous refrigerant charge, IFRF and OFRF. The occurrence of simultaneous refrigerant charge fault, IFRF and OFRF caused up to a 5.7% and 8% decrease in cooling capacity compared to simultaneous refrigerant charge and indoor heat exchanger secondary fluid flow rate faults, and simultaneous refrigerant charge and outdoor heat exchanger secondary fluid flow rate faults, respectively. Simultaneous refrigerant charge fault, IFRF and OFRF resulted in up to an 11.6% and 5.9% decrease in COP of the heat pump unit compared to simultaneous refrigerant charge fault and IFRF, and simultaneous refrigerant charge fault and OFRF, respectively. The developed FDD correlations accurately predicted the simultaneous refrigerant charge and faults in the flow rate of the secondary fluid within an error margin of 7.7%.

Original languageEnglish
Article number3877
JournalEnergies
Volume14
Issue number13
DOIs
Publication statusPublished - 2021 Jul 1

Keywords

  • Brine flow rate fault
  • Cooling capacity
  • COP
  • Fault detection
  • Fault diagnosis
  • Heat pump
  • Refrigerant charge fault

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Fault detection algorithm for multiple-simultaneous refrigerant charge and secondary fluid flow rate faults in heat pumps'. Together they form a unique fingerprint.

Cite this