Worked examples
The list of the book's worked examples is given below.
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.
The objective is to 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. The result is a COP increase of 16 to 19% when the cooling tower is used.
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.
B9.5 WE 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.
The modeling of a micro-turbine LiBr-H2O trigeneration plant is presented.
The resolution of the thermodynamic model is explained, with its implementation in the external class LiBrAbsorption.
The project objective is to study one AZEP cycle of innovative power generation using oxy-combustion, and show how it can realistically model with Thermoptim.
This cycle uses classes MIEC_Inlet.java and MIEC.java modeling a ceramic membrane permeable to oxygen (Mixed Ionic-Electronic Conducting Membrane MIEC).
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
The model uses two external classes, "solar concentrator" and "Dowtherm A".
B18.1 WE Diapason sessions on fuel cells
A series of sessions (S61 to 63) has been prepared to enable students to become familiar with the operation and modeling of fuel cells.
In session S61, we study a SOFC fuel cell, fueled by pure hydrogen, using the simple two parameters model.
In 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.
In session S63, we see how to modify the previously established models to replace hydrogen with a fuel such as methane.
