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Influences of Hot Water Tank States and the Order of Test Days to Gain the Annual Efficiency of Heat Pump Systems Evaluated Using Modelica

Within the scope of this paper, an actual experimental procedure to evaluate a heat pump’s (HP) long-time efficiency is formulated as a pure simulation issue using the modeling language Modelica. Hereby, a long evaluation period is reduced to 4 typical test days. The aim of this paper is to investigate in a cost-efficient manner the influence of shifting energy in thermal energy storages (TES) throughout the experimental time. Since the concept uses particular test days according to the kmedoids clustering, the state of charge (SOC) in the end is unequal to the SOC at the beginning of the test cycle. The paper shows that ordering the test days from warm to cold and back to warm leads to the least mean deviation of inner energy with ΔU = −0.94 kWh.