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Energy Efficiency Modelling of Residential Air Source Heat Pump Water Heater

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 4, Issue 1, March 2016, pp 69-88
DOI: https://doi.org/10.13044/j.sdewes.2016.04.0007
Cong-Toan Tran1 , Philippe Rivière1, Paul Waide2
1 MINES ParisTech, PSL Research University, CES - Centre for Energy Efficiency of Systems, 60 Bd St Michel 75006, Paris, France
2 Waide strategic efficiency Ltd, 72 Lairgate, Beverley, United Kingdom


The heat pump water heater is one of the most energy efficient technologies for heating water for household use. The present work proposes a simplified model of coefficient of performance and examines its predictive capability. The model is based on polynomial functions where the variables are temperatures and the coefficients are derived from the Australian standard test data, using regression technics. The model enables to estimate the coefficient of performance of the same heat pump water heater under other test standards (i.e. US, Japanese, European and Korean standards). The resulting estimations over a heat-up phase and a full test cycle including a draw off pattern are in close agreement with the measured data. Thus the model allows manufacturers to avoid the need to carry out physical tests for some standards and to reduce product cost. The limitations of the methodology proposed are also discussed.

Keywords: Heat pump water heater, Coefficient of performance, Simulation, Test standard.

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