Document information
- University
- Politecnico di Milano
- Degree programme
- Mechanical Engineering
- Subject
- Energy Systems LM
- Academic year
- 2020-2021
- Classification
- Exam · Full exam
- Content
- Exam paper only
- Original format
- Text
- Searchable text
Full exam for Energy Systems LM in the Mechanical Engineering degree programme at Politecnico di Milano. The document covers: WRITTEN TEST ENERGY SYSTEMS 15 JULY 2021 Data Values from tables/Mollier charts Data from person code Person code: 12345678 123 45678 X 36 Y 260 Problem 1 Data for part A net electric power output, MW 36 steam temp at turbine inlet 540 steam pressure at turbine inlet 76 boiler
Full exam for Energy Systems LM in the Mechanical Engineering degree programme at Politecnico di Milano. The document covers: WRITTEN TEST ENERGY SYSTEMS 15 JULY 2021 Data Values from tables/Mollier charts Data from person code Person code: 12345678 123 45678 X 36 Y 260 Problem 1 Data for part A net electric power output, MW 36 steam temp at turbine inlet 540 steam pressure at turbine inlet 76 boiler
Import quality: text was extracted directly from the original document.
Representative passages recognised in different parts of the material. The full extracted text remains available to search, while this compact preview makes the page easier to read.
WRITTEN TEST ENERGY SYSTEMS 15 JULY 2021 Data Values from tables/Mollier charts Data from person code Person code: 12345678 123 45678 X 36 Y 260 Problem 1 Data for part A net electric power output, MW 36 steam temp at turbine inlet 540 steam pressure at turbine inlet 76 boiler pressure drop, % 25 condenser pressure, bar 0.10 hydraulic pumps efficiency 0.80 mech-el. Pump driver efficiency 0.95 turbine isentropic efficiency (each individual section) 0.90 mech-el turbine generator efficiency 0.97 boiler thermal efficiency 0.90 deareator pressure 3 Data for Part B HRSG pinch point temp diff, °C 10 HRSG heat losses,% 0.5 GT turbine oulet temperature, °C 560 GT flue gas flow rate 216 cp fumi, kJ/kg-K 1.05 approach point DT 20 PART A Determine p, h of each stream h_in_turb, kJ/kg 3501.5 from Mollier diagram s_in_turb, kJ/kgK 6.88 from Mollier diagram h_iso_extr, kJ/kg 2678.5 from Mollier diagram h_real_extr 2760.8 from def. of isentropic efficiency T_extr 138.44 T3 is read from the Mollier diagram s_extr 7.08 h_iso_out_turb 2242.4 h_out_turb 2294.2 h_out_cond 191.81 from sat. Steam tables p_out_booster_pump 3.00 work of booster pump, kJ/kg 0.36 from enthalpy change in a pump:s pec_volume*(pout-pin)/eta_hydraulic h_in_deareator 192.17 hout_condenser + booster pump work h_out_deareator 561.46 sat liquid at deareator pressure p_in_boiler, bar 101.33 from boiler pressure drop definition: pin = pout /(1-%_press_drop) work of feedwater pump, kJ/kg 12.29 from enthalpy change in a pum p:spec_volume*(pout-pin)/eta_hydraulic h_in_boiler 573.75 hout_deareator + feedwater pump work determine steam flow rates ratio deareator extraction flow/boiler inlet flow 0.144 imposing energy balance of deareator: m_boiler*h_out_dea = (m_boiler-m_ext)*h_in_dea + m_extr*h_ext --> mextr/m_boiler =…
First page of the document.