Thermodynamic Evaluation of Local Biomass Heat Supply System using Waste Bark Fuel

Abstract

As a regional biomass energy system with a daily scale of 20t which supplies heat energy like hot water or steam to mushroom farmhouses using wood bark with high water content has constructed. A mass and heat equilibrium model was developed for this system and prediction simulation analysis was done to evaluate system performance by thermodynamic point of view. The feature of this system characterized by producing dry chip fuel with excess heat in parallel with heat supply. Evaluation was conducted using indices such as "wood energy utilization rate" and "system exergy efficiency". In the operation in which wet biomass with a water content of 60% was introduced using boiler exhaust gas and the operation of supplying hot water heat by boiler combustion, the energy efficiency resulted to the maximum value of 68%.