ES 05 02 2025 practical test

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POWER PRODUCTION FROM RENEWABLE ENERGY AY 2023-24 5th February 2025 Prof. Andrea Giostri Time: 1.5 hours NAME and SURNAME:.................................................................................................................................................. COURSE and CFU:......................................................................................................................................................... Instructions for the examination: 1) Clearly indicate your name on all the sheets you will deliver. 2) The score refers to exercises done in a comprehensive manner with exact numerical results. Numerical results correct but not accompanied by explanations will not be taken into account. The final score can be normalized according to the average results. 3) Answer briefly and clearly only to the asked questions. Calculations and explanations which do not respond to the questions will not be considered for evaluation even if correct. 4) Talking with colleagues and / or cheating will cause the cancellation of the exam. 5) All the needed data for the resolution of exercises lies on this paper. It is NOT ALLOWED to use material other than this (e.g. books, clipboard etc.). Exercise 1 (15 points) (Energy and Management Engineering (8 CFU) A biomass plant consists of a grate boiler that produces synthetic oil that represents the thermal input to operate an ORC cycle. The boiler is fuelled by wood chips with the following characteristics: • Moisture content: 33% (%weight) referred to biomass (“As received As Received” “AR”) • Ash content: 1.8% (%weight) referred to biomass as received • LHV: 19.3 MJ/kgsdv (sdv = substance dry volatile) Knowing that under the nominal operating conditions of the plant: • Boiler consumes 3.15 t/h of wood chips (As…