**3. Case Study Based on a Commercial Biomass Gasifier**

The measured input and output values are taken from the study of Chee, who investigated the effect of different operating conditions and different wood-based feedstocks on the performance of a commercial biomass downdraft gasifier [12]. In particular, the gasifier used by Chee had a rotating grate at the base of the fixed bed and a fan for driving the air flow and the rotation rate of these two components were investigated [12]. This data set consists of 34 data points with input values given in Table 1 [12]. Run number "201" in this study was not used here because the conditions for that run were significantly different from all the others tested (with an equivalence ratio of 0.56) [12]. From these 34 data points, 25 randomly chosen points were assigned to the training set and the remaining 9 data points were used for testing. The data values used are also given in the Supplementary data file together with additional data used for validation and all the model parameters.

**Table 1.** Input parameters, ranges, and average values for a commercial downdraft biomass gasifier using data from Chee [12].


**Table 1.** *Cont*.


These data values are used to predict the produced gas properties:

