Abstract
In this study, a high-temperature water source cascade heat pump (HTWSCHP) system was developed, which could provide heat at a temperature of approximately 170 °C. In order to select the optimum refrigerant, six pairs of refrigerants were compared theoretically when the heating temperature varied from 100 °C to 170 °C and the evaporation temperature was 55 °C. An experimental setup was used to compare the performance of BY3A/R245fa, BY3B/R245fa and BY3B/BY6 in the HTWSCHP with heating temperature in the range 100–140 °C. The theoretical results led to the selection of BY3B/BY6 as the best refrigerants for HTWSCHP, and the experimental results also showed better performance of BY3B/BY6. Moreover, this system using BY3B/BY6 produced hot water with the highest temperature of 168.4 °C. The coefficient of performance (COP) of the system was the best when the temperature lift was 70 °C compared to other heat pump systems, and the maximum temperature lift reached 113.4 °C. The experimental values of heating capacity, input power, COP, and discharge pressure were in good agreement with the theoretically calculated values. In addition, the results showed that the application scope of the HTWSCHP using BY3B/BY6 as refrigerant should be lower than 155 °C, for the safety of equipment and the economic challenges of practical application.
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