Analisi tecnico – economica di un impianto di trigenerazione a Servizio di un agglomerato residenziale

This paper consists of a technical and economic feasibility study of a CHCP system for the cogeneration of heat, cooling and power to service a residential cluster consists of 30 terraced houses. The study provides a computational tool that realistically simulates the functioning and the performances of the first engine (a micro-turbine powered by natural gas) in different operating conditions, its economic behaviour - in terms of payback period - and its energy and environmental prospects of the tri-generation plant. The simulations have been carried out using the computer code TRNSYS16, which allowed the valuation of energy demand through the dynamic simulation of heat and energy transfer in buildings by their climatic zone and stratigraphy, and software CYCLE-TEMPO, which allowed the check of first engine’s performances in the nominal conditions provided by manufacturer and the forecast of the system’s performances in off-design operation. In particular, the influence of the environmental boundary conditions (such as temperature and relative humidity’s outside air) has been analyzed, allowing the valuation of the electrical and thermal efficiency’s variation and, consequently, the performances of the entire tri-generation system in terms of primary energy saving. Finally, a methodology for comprehensive evaluation of the tri-generation system is introduced, which includes both technical, energy and economic aspects.