Performance Analysis and Optimization of a Dual-Source Heat Pump System: Evaluating Bivalent Point Strategies for Enhanced Efficiency
Keywords:
Dual-source heat pump, air source heat pump, ground source heat pump, bivalent point optimization, coefficient of performance, thermal stability, energy efficiency, heat exchanger performance, system optimization.Abstract
This study presents a comprehensive performance analysis and optimization framework for a dual-source heat pump (DSHP) system integrating Air Source Heat Pumps (ASHP), Ground Source Heat Pumps (GSHP), and Parallel Source Heat Pumps (PSHP). A MATLAB–Simulink model, developed using the CARNOT toolbox, simulates various configurations to identify optimal operational strategies. Results show that hybrid operation improves the Annual Performance Factor (APF) by approximately 5 % compared to a standalone GSHP system and allows a reduction in borehole depth by ~28 % (from 70 m to 50 m) while maintaining stable brine temperatures. The optimized bivalent switching (ASHP > 0 °C; GSHP < 0 °C down to –10 °C) minimizes temperature lift and enhances thermal balance in the ground loop. The findings highlight the importance of coordinated source management for achieving higher energy efficiency and long-term stability in hybrid heat pump systems.
