ES GA2

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Group Activity 2: Off-design Steam Cycle & Heat rejection Mechanical Engineering - Energy Systems Authors: •Group xx: xxxxx xxxxx (xxxxxxxx), xxxxx xxxxx (xxxxxxxx) •Group xx: xxxxx xxxxx (xxxxxxxx), F abio Santoro (xxxxxxxx) Lecturer:Prof. Stef ano Consonni T eaching Assistants:Riccardo Cremona, Hamidreza Heydari and Nima Razmjoo Academic year:2025-2026 Contents Introduction 2 1 Design Operation 2 2 Off-Design Operations 7 2.1 Scenario #1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Scenario #2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.3 Scenario #3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.4 Scenario #4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.5 Scenario #5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3 Design and Off-Design results comparison 18 4 Heat Rejection 22 GA Assessment 25 References 25 1 Energy Systems - Report GA2 - Groups xx and xx Introduction The scope of this activity is the design of a low-performance and low-cost subcritical superheated steam cycle plant. The working fluid (steam) is heated by the combustion of a fuel in a firing boiler. A simplified scheme of the steam plant is shown in Figure 1. In the boiler, there are three heat exchangers — the evaporator, superheater, and economizer — which heat the working fluid from sub-cooled to superheated conditions. The burners inside the boiler can be tilted to modify the heat transfer properties of the evaporator (U AEV A). Between the superheater and the steam turbine, it is possible to adjust the fluid pressure through the action of a throttling valve. At the turbine outlet,…