Abstract
The continuous demand to reduce both the pollutant emissions and the greenhouse gas (GHG) is increasing the use of alternative fuels as biodiesel in direct-injection compression ignition engines under combined heat and power (CHP) configuration. Although the biodiesel has different thermophysical properties compared to the standard diesel, it can be used in compression ignition engines without significant modifications. However, the pure biodiesel and biodiesel/diesel blends provide different performance and combustion characteristics with respect to the standard diesel engine. In order to estimate the behaviour of a micro-CHP system fuelled with biodiesel, a zero dimensional (0D) numerical model was development. This model is based on a single zone model and predicts the behaviour of a biodiesel/diesel blend-fired engine at full and partial load in terms of electrical efficiency, thermal efficiency and specific fuel consumption. Notwithstanding the biodiesel/diesel blend reveals lower performance in terms of electric and thermal efficiencies, can be used in CHP systems preserving the environmental sustainability avoiding significant modifications in the engine architecture.
Highlights
It is well known that Diesel engines are widely used for applications in the power generation, cogeneration and automotive sector
The model is validated in terms of brake thermal efficiency (BTE) and BSFC of the engine running on B0 and B30 at different engine loads
A 0D-thermodynamic model has been developed for the prediction of the performance of a compression ignition engines fuelled by pure diesel fuel (B0) and a diesel/biodiesel blend with a low biodiesel concentration (B30), in order to avoid modifications in the engine architecture
Summary
It is well known that Diesel engines are widely used for applications in the power generation, cogeneration and automotive sector. Numerous studies on mathematical models of internal combustion engine were widely investigated These models can be divided in thermodynamic models, which includes zero-dimensional (0D)/one-dimensional (1D) models and fluid dynamics models (Computational Fluid Dynamics, CFD) often called multidimensional models [4]. The mathematical model is based on a 0D-thermodynamic code, which predicts the performance of the internal combustion engine fuelled with biodiesel fuel in terms of, electric efficiency, thermal efficiency and specific fuel consumption (SFC) at different loads and at a given engine speed
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