Abstract
The aim of the study was modelling of HHV of oat (grain and straw) biomass. The content of ash, carbon, hydrogen, nitrogen, moisture, volatile materials and the higher heating value of oat (grain and straw) biomass was measured. The possibility of using twenty models from the literature to describe HHV of oat was examined. The following models: HHV=19.914-0.2324A and HHV=-3.0368+0.2218VM+0.2601FC are recommended for determining of HHV of oat (RMSE of the range 0.13-0.28). The models based on ultimate analysis gave worse results in determination of HHV for oat.
Highlights
IntroductionHeat of combustion and the calorific value are the other names of heating value (HV)
The heating value (HV) of a fuel is a measure of this fuel energy content
Model (5)c2 is recommended for higher heating value (HHV) of grain calculation, while this model for HHV of straw and the model with other constants (c1 and c3) give bad results for both oat grain and straw (1.24 RMSE 4.22)
Summary
Heat of combustion and the calorific value are the other names of HV. The lower heating value (LHV) is a measure of the enthalpy change during combustion at constant pressure with water in a vapour state, whereas the higher heating value (HHV) measures discussed enthalpy change, but with water in a liquid state [1]. The higher heating value informs about the amount of heat released during the complete burning of a fuel unit mass including the condensation enthalpy of liquid water as a combustion product under standard conditions [2]. The HHV of fuels can be determined experimentally by burning a specimen in a adiabatic oxygen bomb calorimeter under controlled conditions. The higher heating value can be approximately predicted using empirical models. Most of the developed models are linear [5,6], same of the correlations between HHV and the constituents of the analysis could be nonlinear [7,8]
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