🛠️ Worked Examples
Below is the complete list of worked examples from the book, with detailed explanations, organized by chapter.
Chapter 5: Steam Cycle Components
B5.2 WORKED EXAMPLE: Refrigeration machine condenser with cooling tower
This example corresponds to a R134a refrigeration machine ensuring the production of 200 kW of cooling at -12 °C, whose condenser is cooled by air at 25 °C.
Objective: Compare the performance of the machine depending on whether one uses an air exchanger with a pinch of 16°C or a cooling tower, the minimum pinch between water and the refrigerant being below 12°C.
Result: The result is a COP increase of 16 to 19% when the cooling tower is used.
It is presented in the portal guidance pages. 🔹 Access Worked Example
Chapter 8: Variants of Steam Power Plants
B8.1 WORKED EXAMPLE: Extraction of noncondensable gases from a condenser
This example analyses the use of ejectors to remove the noncondensable gases from the condenser of a steam propulsion engine of the Merchant Marine, to understand the mechanisms that come into play and to estimate its impact on the energy balance of the ship.
It is presented in the portal guidance pages.
Chapter 9: Conventional Internal Combustion Engines
B9.5 WORKED EXAMPLE: Modeling of a Diesel engine cycle
This example shows how a Diesel engine cycle can realistically be modeled with Thermoptim. It is presented in the portal guidance pages as well as in the Diapason session 38.
Such a model is a little difficult to set, given its complexity.
🔹 Access Diapason Session 38 | Access Guidance Page
Chapter 10: Combined Cycles
B10.4 WORKED EXAMPLE: Cogeneration plant producing electricity and providing heat to a district heating
This example which corresponds to a real-world case, is presented in the Diapason session S47En.
This cogeneration plant produces electricity and provides heat to the district heating network of a town of 30,000 inhabitants.
🔹 Access Diapason Session S47En
B10.5 WORKED EXAMPLE: Modeling of a Trigeneration Plant
The modeling of a micro-turbine LiBr-H₂O trigeneration plant is presented in a guidance page of the Thermoptim-UNIT portal (in French).
The resolution of the thermodynamic model presented is explained, with its implementation in the external class LiBrAbsorption.
Key Feature: Uses the external class LiBrAbsorption.
Chapter 15: Advanced Cycles
B15.3 WORKED EXAMPLE: Modeling of an Advanced Zero Emission Power Cycle (AZEP)
Objective: Study an innovative power generation cycle using oxy-combustion.
Tools Used:
- MIEC_Inlet.java and MIEC.java (ceramic membrane modeling).
It is presented in the portal guidance pages.
Chapter 16: Solar Energy
B16.2 WORKED EXAMPLE: Modeling of a SEGS solar plant
The modeling of a SEGS solar power plant is presented in a guidance page of the Thermoptim-UNIT portal.
It allows you to study the operation of solar power plants and show how they can be realistically modeled with Thermoptim. The solar collector is type SEGS developed by the company Luz. The cycle is as a simple variant of a Rankine cycle, where the boiler is replaced by a steam generator in which the thermal fluid is heated by the field of collectors.
Features:
- Solar collector modeled as an external class.
- Uses Dowtherm A as the thermal fluid.
The model uses two external classes, “solar concentrator” and “Dowtherm A”.
Chapter 18: Fuel Cells
B18.1 WORKED EXAMPLE: Diapason sessions on fuel cells
A series of sessions (S61 to 65) has been prepared to enable students to become familiar with the operation and modeling of fuel cells.
It is presented in the portal guidance pages 🔹 Access Worked Example
Session S61: We study a SOFC fuel cell, fueled by pure hydrogen, using the simple two parameters model.
Session S62: The previous model is progressively refined, first by taking into account the equation of polarization of the cell and then introducing a cooling of the stack. Finally, an exercise shows how to couple the battery to a gas turbine to form an installation of high efficiency cogeneration.
Session S63: We see how to modify the previously established models to replace hydrogen with a fuel such as methane.
Session S64: Deals with reforming (in French).
Session S65: Models a PEMFC fuel cell (in French).
© Renaud Gicquel, 2021.2
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