Thermodynamic and economic assessment of a novel CCHP integrated system taking biomass, natural gas and geothermal energy as co-feeds

•A novel CCHP system based on biomass, natural gas and geothermal energy is proposed.•The thermodynamic and economic evaluation of proposed system are investigated.•Effects of gas mass ratio and split ratio on integrated system are presented.•The sensitivity analysis of economic factors on system performance is carried out.