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1

Application of Stirling engine type alpha powered by the recovery energy on vessels

100%
Kropiwnicki J.
Polish Maritime Research
|
2020
|
tom 27
|
nr 1
The Stirling engine is a device in which thermal energy is transformed into mechanical energy without any contact between the heat carrier and the working gas enclosed in the engine. The mentioned feature makes this type of engine very attractive for the use of the recovery energy taken from other heat devices. One of the potential applications of Stirling engines is the use of thermal energy generated in the ship’s engine room for producing electricity. The work presents the concept of the Stirling engine type alpha powered by the recovery energy. The model of Stirling engine developed in this work allows a quantitative assessment of the impact of the design features of the engine, primarily the heat exchange surfaces and the volume of control spaces, on the achieved efficiency and power of the engine. Using an iterative procedure, Stirling engine simulation tests were carried out taking into account the variable structural features of the system. The influence of the size of the heater and the cooler, as well as the effectiveness of the regenerator and the temperature of the heat source on the efficiency and power produced by the Stirling engine have been presented
2

Adres do uczestników konferencji Planowanie i zarządzanie w obszarach metropolitalnych

100%
Kropiwnicki J.
Biuletyn PAN. Komitet Przestrzennego Zagospodarowania Kraju
|
2005
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nr 221
3

Causality in models of thermal processes in ship engine rooms with the use of Bond Graph (BG) method

51%
Cichy M., Kneba Z., Kropiwnicki J.
Polish Maritime Research
|
2017
|
tom 24
|
nr Special Issue S1
With a single approach to modeling elements of different physical nature, the method of Bond Graph (BG) is particularly well suited for modeling energy systems consisting of mechanical, thermal, electrical and hydraulic elements that operate in the power system engine room. The paper refers to the earlier presented [2] new concept of thermal process modeling using the BG method. The authors own suggestions for determining causality in models of thermal processes created by the said concept were given. The analysis of causality makes it possible to demonstrate the model conflicts that prevent the placement of state equations which allows for the direct conduct of simulation experiments. Attention has been drawn to the link between the energy systems models of thermal processes with models of elements of different physical nature. Two examples of determining causality in models of complex energy systems of ther mal elements have been presented . The firs relates to the electr ical system a ssociated with the process of heat exchange. The second is a model of the mechanical system associated with the thermodynamic process
4

A model of thermal energy storage according to the convention of Bond Graphs (BG) and State Equations (SE)

51%
Cichy M., Kropiwnicki J., Kneba Z.
Polish Maritime Research
|
2015
|
tom 22
|
nr 4
The main advantage of the use of the Bond Graphs method and State Equations for modeling energy systems with a complex structure (marine power plants, hybrid vehicles, etc.) is the ability to model the system components of different physical nature using identical theoretical basis. The paper presents a method of modeling thermal energy storage, which is in line with basic BG theory. Critical comments have been put forward concerning multiport energy storage introduced by other authors or the so-called C-field. In suggested approach, the decision not to use pseudo Bond Graphs has been justified as not being in line with basic BG theory. On the basis of molecular physics it was considered that the state variable, in physical and mathematical sense, should be temperature rather than entropy. Examples of the application of the proposed approach to thermodynamic processes and heat exchange have been presented. The application of a single graph as a model for thermal energy storage has been illustrated by a way of numerical simulation examples.
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