25 06 18

Pagina 1

Politecnico di Milano Department of Energy - School of Industrial Engineering Course Energy Systems LM prof. S. Consonni, E. Martelli, M. Romano - Academic Year 2017/18 Written Exam – Energy systems LM pag. 1 di 1 Written Exam 25 June 2018 Theoretical Questions: Time 1.00 h 1) Books, lecture notes, cell phones are forbidden. Using them or talking with colleagues and/or copying will lead to the immediate invalidation of the exam. 2) Answer clearly ONLY to the questions posed by the problem sets. Even if correct, additional considerations will NOT contribute to the final grade – and you have NOT enough time to do this ! 3) Fill this sheet with your name and return it. 4) MARK EACH SHEET with YOUR NAME AND PAGE/SHEET NUMBER. 5) WRITING AND SHEET/PAGE SEQUENCE MUST BE LEFT TO RIGHT AS USED IN WESTERN COUNTRIES. 6) The final grade is the sum of the points assigned to the answer of each question plus a bonus of max 3 points. The bonus will be given based on completeness, clarity and details of the explanations. 7) Wherever possible, support your statements with clear drawings and/or graphical representations FIRST NAME………………………......……………..…FAMILY NAME…………………………………….……………….. Question 1 (18 points): STEAM CYCLE CONDENSER A) Describe the main peculiarities (type of heat exchanger, arrangement, schematic drawing, etc) of water cooled and air-cooled condensers for steam cycles. B) Describe and motivate the main differences (advantages and disadvantages) between the two types of condensers in terms of the effects on the steam cycle efficiency and expected capital costs. C) Describe the main design variables of water-cooled condensers (those that the engineer has to select during the design phase) and explain the main steps of the design procedure. D) Consider a steam cycle with a…