Abstract
With the outstanding performance potential and excellent modulation capacity, the Two-Stage Air Source Heat Pump (TSAHP) may become a substitute for fossil fuels for space heating in cold climates. In TSAHP, the design cylinder volume ratio is closely related to the evaporating and condensing conditions and will determine the average heating seasonal coefficient of performance (COP¯). In this paper, based on weather data and a two-step optimization approach, a volume-ratio selection method was presented. Eight typical cities in the cold region of North China were selected for demonstrating the impacts of the optimum cylinder volume ratio at different outdoor design temperatures on COP¯. The results show that the appropriate outdoor design temperature is between −4 °C and −8 °C, and the corresponding design cylinder volume ratio is between 2.0 and 2.1. The COP¯ with the volume ratio of 2.0 is 10.3% and 17.6% higher than that with the volume ratio of 3.0.
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