  We investigate the thermodynamical properties of charged torus-like black
holes and take it as the working substance to study the heat engines. In the
extended phase space, by interpreting the cosmological constant as the
thermodynamic pressure, we derive the thermodynamical quantities by the first
law of black hole thermodynamics and obtain the equation of state. Then, we
calculate the efficiency of the heat engine in Carnot cycle as well as
rectangular cycle, and investigate how the efficiency changes with respect to
volume. In addition, to avoid a negative temperature, we emphasize that the
charge of this black hole can not be arbitrary. Last, we check the calculation
accuracy of a benchmark scheme and discuss the upper bound and lower bound for
charged torus-like black hole in the scheme.
