A comprehensive evaluation method of thermal

environmental and economic (TEE)performance for an energy system with multi-products was proposed.In this approach

environmental impact of the energy system was quantified in form of exergy cost of the virtual emission treatment unit

which was a virtual unit and had no effect on energy system itself.Then

exergy cost of virtual emission treatment unit was distributed to each unit of energy system to reflect the difference of influences of environmental concern on different products

according to the proportion of emission produced by each unit in the total emission of energy system.And then

in order to introduce application of this comprehensive evaluation approach

a coal gasification Fischer-Tropsch synthesis and electricity co-production system was analyzed.Compared with that by the conventional technical and economic approach based on the first law of thermodynamics

the proposed approach could be used to calculate the energy consumptions and costs of different products

and analyze the benefit sources of comprehensive TEE performance of the co-production system.Compared with that by the conventional exergy-economic analysis method

the proposed approach could reflect the difference of influences of environmental concern on different products

and the comprehensive TEE performance potential of the co-production system.