Renewable energy generation has gained importance in engineering research fields due to the adverse effects generated by fossil fuels. In this context, residual biomass presents great advantages due to its potential and low cost. Within this biomass is the manure livestock, which could be used as an energy source through anaerobic biodigestion, obtaining a gas that can be used for electricity or heat generation processes. Therefore, the objective of the research was to evaluate energetically the cogeneration of an internal combustion engine (ICE) coupled to an absorption refrigeration system (ARS) of simple effect using biogas as a fuel by varying the compositions of CH<sub>4</sub> and CO<sub>2</sub>, taking advantage the temperature of the gases to obtain heat extraction in a refrigeration system. For this purpose, a thermodynamic model of the process was proposed using process simulation software which contemplates the different processes of a Diesel cycle in order to adjust the different properties. Afterwards, a parametric analysis was performed to determine the influence of the input on the output variables. A maximum efficiency of 44.9% was obtained with an excess air of 35%, by varying the fuel composition a maximum efficiency of 44.4% was obtained, the COP of the system remained between 0.189-0.190 by varying parameters such as pressure, temperature and fuel composition.

Energy evaluation of cogeneration using an internal combustion engine coupled to an absorption refrigeration system using biogas as fuel

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