With the deepening of energy conservation and emission reduction

the improvement of energy efficiency

integrated system coupling refrigeration with heating is bound to be further promoted and applied. Compared with traditional refrigeration system and heating system

the integrated system can comprehensively utilize the energy of both cold and heat. Therefore

whether the calculation of the energy efficiency of individual cold and heat is still applicable to the new system. In this paper

two kinds of integrated system coupling refrigeration with heating of integrated system A with cascade unit and heat pump

and integrated system B with conventional refrigeration unit and heat pump are constructed

and three methods of energy efficiency calculation are proposed. Through specific experiments

three coefficients of performance (COP) calculation methods and results are given for discussion and analysis within the industry. Among them

the third calculation method take into account the cooling capacity of the refrigeration system and the heating of the heat pump system

and the shaft power of the whole system is regarded as the compensation energy

it is the most reasonable method.