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基于直膨式太阳能热泵热水器的热力循环,在建立太阳集热器/蒸发器和冷凝器的分布参数数学模型、压缩机和热力膨胀阀的集总参数数学模型的基础上,用能量平衡和质量平衡等约束条件将四大部件结合起来并进行求解。理论计算结果与若干典型工况下的实验数据对比表明:集热器平均集热效率的平均相对误差为4.6%,热水得热量、压缩机功耗、COP等指标的平均相对误差都在1%以内;热水温度、COP和集热器集热效率的理论和实验值的瞬时变化规律吻合良好,从而验证了此仿真数学模型的准确性。
Based on the thermodynamic cycle of direct-expansion solar heat pump water heaters, based on the mathematical model of the distribution parameters of solar collectors / evaporators and condensers, and the lumped parameter mathematical model of compressors and thermal expansion valves, energy balance and mass Balance and other constraints will be the four components combined and solved. The results of theoretical calculation and experimental data under several typical operating conditions show that the average relative error of collector average heat efficiency is 4.6%, the average relative error of hot water, compressor power, COP and other indicators are both 1% ; The instantaneous variation law of the theoretical and experimental values of hot water temperature, COP and heat collector efficiency agree well, which verifies the accuracy of the simulation mathematical model.