| Title |
Cost Estimating of Electricity and Steam on a Gas-Turbine Cogeneration |
| Keywords |
가치 ; 엑서지 ; 가역일 ; 열병합발전 ; 원가 ; 원가산정 ; 비용배분 Worth ; Exergy ; Reversible work ; Cogeneration ; Unit cost ; Cost estimating ; Cost allocation |
| Abstract |
When various kinds of outputs are produced from a single energy system, the methodology which allocates the common cost to each output cost is very important because it is directly related with the profit and loss of producers and purchasers. In the cost allocation methodology of the heat and the electricity on a cogeneration, there are energy method, work method, proportional method, benefit distribution method, various exergetic methods, and so on. On the other hand, we have proposed a worth evaluation method which can be applied to any system. The definition of this methodology is that the unit cost of a product is proportion to the worth. Where, worth is a certain evaluating basis that can equalize the worth of products. In this study, we applied this methodology to a gas-turbine cogeneration which produces 119.2 GJ/h of electricity and 134.7 GJ/h of steam, and then we allocated 3,150 $/h of fuel cost to electricity cost and steam cost. Also, we compared with various cost allocation methods. As the result, we conclude that reversible work of various kinds of worth basis evaluates the worth of heat and electricity most reasonably. |