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This study experimentally investigates the performance enhancement of an air-source heat pump (ASHP) system through integration with a flat-plate solar collector (FPSC) using a tube-in-tube heat exchanger. The hybrid system employs R134a refrigerant in the heat pump cycle and water as the working fluid in the solar loop, with a dual-condenser configuration (air-cooled and water-cooled) for optimized heat transfer. Under real-world conditions in Mosul, Iraq, the system’s performance was evaluated by monitoring the coefficient of performance (COP), water temperatures, and solar radiation intensity during peak daylight hours (9:00 AM–5:00 PM). Results demonstrate a significant COP improvement from 9.67 to 10.5 during peak solar irradiation (940 W/m2), with domestic hot water temperatures reaching 59.9 ℃. Flow rate variations (1.05–1.7 L/s) revealed that higher flow rates improved heat exchange stability, while the solar collector’s preheating effect reduced compressor workload. The study confirms the technical feasibility of the hybrid design, achieving an 8.7% COP increase compared to standalone ASHP operation. These findings highlight the system’s potential to reduce energy consumption in residential water heating, particularly in sun-rich regions, while contributing to decarbonization efforts. Key challenges include flow rate optimization and diurnal performance variability, warranting further investigation under diverse climatic conditions.

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Boosting Heat Pump Efficiency with Flat-Plate Solar Collectors: Experimental Analysis of COP and Thermal Output

  • 会议论文

  • 发表日期：

    2026年

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  • Ehssan Mohammad Ali,
  • Nabeel M. Abdulrazzaq

摘要

This study experimentally investigates the performance enhancement of an air-source heat pump (ASHP) system through integration with a flat-plate solar collector (FPSC) using a tube-in-tube heat exchanger. The hybrid system employs R134a refrigerant in the heat pump cycle and water as the working fluid in the solar loop, with a dual-condenser configuration (air-cooled and water-cooled) for optimized heat transfer. Under real-world conditions in Mosul, Iraq, the system’s performance was evaluated by monitoring the coefficient of performance (COP), water temperatures, and solar radiation intensity during peak daylight hours (9:00 AM–5:00 PM). Results demonstrate a significant COP improvement from 9.67 to 10.5 during peak solar irradiation (940 W/m2), with domestic hot water temperatures reaching 59.9 ℃. Flow rate variations (1.05–1.7 L/s) revealed that higher flow rates improved heat exchange stability, while the solar collector’s preheating effect reduced compressor workload. The study confirms the technical feasibility of the hybrid design, achieving an 8.7% COP increase compared to standalone ASHP operation. These findings highlight the system’s potential to reduce energy consumption in residential water heating, particularly in sun-rich regions, while contributing to decarbonization efforts. Key challenges include flow rate optimization and diurnal performance variability, warranting further investigation under diverse climatic conditions.