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Energies 2019, 12(3), 545; https://doi.org/10.3390/en12030545

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

1
Graduate School of Mechanical Engineering, Hanbat National University, Daejeon 34158, Korea
2
Department of Architectural Engineering, Hanbat National University, Daejeon 34158, Korea
3
Department of Mechanical Engineering, Hanbat National University, Daejeon 34158, Korea
*
Author to whom correspondence should be addressed.
Received: 21 January 2019 / Revised: 3 February 2019 / Accepted: 5 February 2019 / Published: 10 February 2019
(This article belongs to the Section Energy Storage and Application)

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. View Full-Text
Keywords: fault detection and diagnosis; refrigerant charge; heat pump; outdoor entering water temperature; algorithm fault detection and diagnosis; refrigerant charge; heat pump; outdoor entering water temperature; algorithm
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Boahen, S.; Lee, K.H.; Choi, J.M. Refrigerant Charge Fault Detection and Diagnosis Algorithm for Water-to-Water Heat Pump Unit. Energies 2019, 12, 545.

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