C1 (i) Write any Ywo difference between updraft and downdraft Gasifier. C1 (ii) The following data are given for a family biogas digester suitable for the output of five cows. The retention time is 20...

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Extracted text: C1 (i) Write any Ywo difference between updraft and downdraft Gasifier. C1 (ii) The following data are given for a family biogas digester suitable for the output of five cows. The retention time is 20 days, temperature is 30 degrees, dry matter consumed per day is 2 kilogram and biogas yield is 0.24 m per kilogram. The efficiency of burner is 65 %, the fraction of methane in biogas is 0.8 and heat of combustion of methane is 22 MJ/m. Calculate the energy available in biogas digester.