Abstract
Although the cost allocation method does not change the total benefits of CHP, the use of various cost allocation methods generally results in significant differences in costs allocated for CHP products. In order to overcome the inadequacy of existing cost allocating methods in theory and in practice, according to the different roles of anergy and exergy in heat supply process of CHP plant, the reduced exergy method for cost allocation is formulated by introducing the concepts of the available anergy and reduced exergy. The contribution of the available anergy is expressed with a user factor, which can reflect different utilization for different practical conditions. Some practical conditions for typical CHP units are computed and compared with existing methods. Calculations show that the cost allocation by using the reduced exergy model is more rational and practical than those by using existing models in terms of embodying the physical meaning.
Highlights
IntroductionCombined heat and power (CHP) is defined as the simultaneous production of power (either electrical or mechanical) and useful heat (e.g. steam and /or heat water), with the reject heat of one process becoming energy input a subsequent process so that the same fuel is used for two purposes [1,2,3,4]
Combined heat and power (CHP) is defined as the simultaneous production of power and useful heat, with the reject heat of one process becoming energy input a subsequent process so that the same fuel is used for two purposes [1,2,3,4]
In order to overcome the deficiencies with existing heat-electricity cost allocation methods, the concepts of the available anergy and reduced exergy are introduced
Summary
Combined heat and power (CHP) is defined as the simultaneous production of power (either electrical or mechanical) and useful heat (e.g. steam and /or heat water), with the reject heat of one process becoming energy input a subsequent process so that the same fuel is used for two purposes [1,2,3,4]. In order to fully realize CHP’s potential and to exert its advantages, it is most important to establish a reasonable cost allocation method for heat production and electricity generation in CHP plants. Some typical CHP units with different parameters are investigated and compared with different methods
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