Convegni ATI - Accesso riservato soci CTI

Autore: Assunta Napolitano, Giuseppe Franchini, Antonio Perdichizzi, Wolfram Sparber

Collana: CA - 64 - L'Aquila 2009

Note:
On the subject of high energy efficiency systems, the present work focuses on Combined Heating, Cooling and Power (CHCP) plants, made up of gas engine as prime mover and absorption chiller as cooling device, combined with Evacuated Tube solar thermal Collectors (ETC). Besides the advantages, i.e. electricity on site, heat recovery, thermal driven cooling and renewable energy use, such an energy system can also feature critical aspects, as demonstrated by some existing installations. As such issues are strictly related to the planning process, a procedure for optimal designing CHCP plus ETC systems has been developed. The procedure consists of three steps: the selection of a layout and a control strategy, the definition of a sizing procedure for each component included in the selected layout, and the development of a TRNSYS deck which simulates the designed plant at off design conditions. The design procedure has been applied to a real case in order to identify the optimal sizes for the major components of the layout, i.e. the cogeneration unit, the absorption chiller and the solar collectors, under different control strategies. The optimization process has taken into account the savings of Primary Energy Consumption, Operation Costs and CO2 emissions which can be achieved by the examined system with respect to a reference system (gas heater plus local electricity grid). The analysis has also highlighted the contribution given by each component onto the overall performance of the plant. The results derived from the application of the design procedure to the real case dictate general guidelines to design CHCP plus SHC energy systems.