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本文采用等价热力变换法,把有内循环不可逆损失和有限热容热源的实际热泵热水器系统变换为等价逆卡诺循环系统,并用定态有限时间热力分析法建立了系统各环节的有效能消耗率方程和系统不可逆度方程,求解了换热器与热泵循环的不可逆耦合问题,重点推导了蒸发器的空气流率与风机消耗功率、传热不可逆损失、蒸发温度、系统性能系数以及不可逆度的关系,算例分析得到了系统的最小不可逆度、最大COP参数所对应的最佳热力参数,所得的最佳冷风温差值与实际基本符合。
In this paper, the equivalent heat transfer method is used to transform the actual heat pump water heater system with irreversible loss of internal circulation and finite heat capacity heat source into an equivalent inverse Carnot circulatory system. The finite element time-dependent thermodynamic analysis method is used to establish the effective energy Consumption rate equation and system irreversible equation, the problem of irreversible coupling between heat exchanger and heat pump cycle was solved, and the relationship between air flow rate and fan power consumption, loss of heat transfer irreversible loss, evaporation temperature, coefficient of system performance and irreversibility The optimal thermal parameters corresponding to the minimum irreversibility and the maximum COP parameter of the system are obtained by the example analysis. The optimal temperature difference between the obtained cold air and the actual temperature is basically in line with the actual situation.