title: Comment on "Thermodynamic Efficiency of Pumped Heat Electricity Storage".
authors.affiliation: Department of Physics, Xiamen University, Xiamen 361005, People's Republic of China.
authors.forename: Jincan
authors.initials: J
authors.lastname: Chen
authors.affiliation: College of Physics and Information Engineering, Fuzhou University, Fuzhou 350002, People's Republic of China.
authors.forename: Juncheng
authors.initials: J
authors.lastname: Guo