This paper presents a photovoltaic (PV) powered pumping system applying in a solar domestic hot water (SDHW) system. Two circulators (‘Standard' and ‘Solar') are employed respectively. A new model of circulator is developed in TRNSYS based on a ‘Standard' type that consists of a DC-brushless motor and a centrifugal pump. Model validation is carried out by comparing with the experimental measurement. The experimental performance of these two circulators is analyzed on the aspects of startup and the stable operation stage.
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