We investigate the thermodynamic phase transition and heat engine efficiency in regular Bardeen AdS black hole. The thermodynamics of the black hole is analyzed in extended phase space. A first order phase transition analogous to van der Waal system is evident from this study, which is affirmed by the specific heat divergence at the critical points. A conventional heat engine is constructed by considering the black hole as working substance. The efficiency is obtained via a thermodynamic cycle in the $P-V$ plane, which receives and ejects heat. The heat engine efficiency is improved by adding a quintessence field. The analytical expression for heat engine efficiency is derived in terms of quintessence dark energy parameter.

我们研究了常规Bardeen AdS黑洞中的热力学相变和热机效率。在扩展相空间中分析了黑洞的热力学。从这项研究中可以明显看出类似于范德华系统的一阶相变，这在临界点处的比热散布得到了证实。通过将黑洞作为工作物质来构造常规的热机。效率是通过热力学循环获得的。$P-V$接收和释放热量的平面。通过增加一个典型场来提高热机效率。根据典型的暗能量参数推导了热机效率的解析表达式。