Experimental investigation of the operations of a small-size ICE-based CHP in an Italian industrial context 2018-32-0063
The distributed generation of electricity is worldwide growing thanks to the inherent advantages it brings to local users: in this context, micro-cogeneration systems allow cheap, affordable and reliable power and heating supply. The experimental operation of a 25 kWe Yanmar micro-CHP, based on a 4-stroke, 4-cylinder lean-burn internal combustion engine fed by natural gas exploiting the Miller cycle, during a time period of 1 year is here analysed. The system is coupled with an absorption chiller and is installed in a small-size enterprise in central Italy, in order to supply the thermal base load of the company and part of the electric request. The main characteristics and the performance of the engine are widely analysed, in particular the electric and thermal efficiencies are mapped through the whole year and the most remarkable differences due to the seasonal environmental conditions are underlined. A comparison is also carried out, in terms of environmental and economic performance, considering as benchmark the condition of the energy supply of the company before its installation, i.e. the power supply from the distribution grid and the thermal requests satisfied from an electric chiller and a natural gas boiler for the cooling and heating demand, respectively. Finally, a summary of the main results is presented, underlying the main advantages and the barriers that this technology is facing for its further spread.