Refrigerant Charge Fault Detection and Diagnosis Algorithm for Water-to-Water Heat Pump Unit

Samuel Boahen, Kwang Ho Lee and Jong Min Choi
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Samuel Boahen: Graduate School of Mechanical Engineering, Hanbat National University, Daejeon 34158, Korea
Kwang Ho Lee: Department of Architectural Engineering, Hanbat National University, Daejeon 34158, Korea
Jong Min Choi: Department of Mechanical Engineering, Hanbat National University, Daejeon 34158, Korea

Energies, 2019, vol. 12, issue 3, 1-25

Abstract: Refrigerant charge faults have a great adverse effect on the performance of heat pumps and must therefore be detected and diagnosed early in real time. In this study, the effect of refrigerant charge faults on a water-to-water heat pump is experimentally investigated in cooling mode and heating mode at various outdoor entering water temperature conditions. The study showed that refrigerant undercharge affects the performance of water-to-water heat pump more in heating mode than in cooling mode. Results from the study are used to develop a refrigerant charge fault detection and diagnosis (FDD) algorithm that works using correlations and rule-based refrigerant fault characteristic charts. The FDD algorithm is able to detect refrigerant charge faults in the water-to-water heat pump within an error threshold of ±4.5% and ±1.1% in cooling mode and heating mode respectively.

Keywords: fault detection and diagnosis; refrigerant charge; heat pump; outdoor entering water temperature; algorithm (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (7)

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