Optimization of the CHP System, Investigation of its Pollution and Economic Costs in Ideal and Real Conditions in terms of Local and Global Approach

In present paper, after optimizing the capacity of the CCHP system equipment using the three-yearly relative annual benefit method, the CO2, CH4, CO, NOx and SOx emissions are studied. Optimization is carried out, assuming operation in the off-design points and ability to sell electricity to the network. The performance of the system will be evaluated in real conditions (under the influence of ambient temperature and pressure) and ideal, as well as two views on the production of pollutants at the place of consumption (Local) and total emissions (Global). Optimization process suggests an internal combustion engine with a nominal capacity of 2440 kW as a prime mover for the case study of the hotel, which despite the significant reduction of CO2, CO, NOx and SOx emissions in global mode, increases the CH4, CO and NOx in comparison with the traditional system at local mode by 92.5 %, 0.79 % and 84.1 %. On the other hand, the economic performance of the power unit of the CCHP system with a change in environmental conditions indicates that if the actual performance of the gas engine in the system is not considered, the system incomes will not have the required certainty.