Thermodynamic analysis and multi-objective optimisation of endoreversible Lenoir heat engine cycle based on the thermo-economic performance criterion

A thermodynamic analysis of a real waste-heat thermoelectric generator is investigated. The thermoelectric generator is considered as a heat engine cycle process with internal irreversibilities. The efficiency of the thermoelectric generator is expressed in terms of two non-dimensional parameters which are to be optimized. A finite-time thermodynamic analysis is used to optimize the temperatures of the hot and cold junctions of the real thermoelectric generator. A comparison between ideal and real waste-heat thermoelectric generators is demonstrated.

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Encoding a Model-Based Display with Dynamic Data

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/154193120004402222 ◽

2000 ◽

Vol 44 (22) ◽

pp. 579-582 ◽

Cited By ~ 2

Author(s):

Leo Beltracchi

Keyword(s):

Nuclear Power ◽

Power Plants ◽

Analytical Data ◽

Heat Engine ◽

Rankine Cycle ◽

Direct Perception ◽

Dynamic Data ◽

Model Based ◽

Heat Engine Cycle ◽

Engine Cycle

A model-based display of the heat engine cycle for a nuclear power plant is defined and illustrated in terms of the thermodynamic first principles used to design the plant. The model-based display is a modified Rankine Cycle, the basic heat engine cycle for power plants. The display is made from measured process variables and the properties of water and presented on a CRT in iconic form, thereby providing a direct perception of the process. This structure of display design is an example of Rasmussen's means-ends hierarchy; starting with the abstract and ending with the specific display. Encoding the display with dynamic data aids operators in monitoring and interpreting the plant during transients and disturbances. Analytical data on the TMI-2 accident is used to illustrate the dynamic coding of the model-based display. The concepts discussed and illustrated are applicable to fossil and nuclear power plants and to other process industries.

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Mass Engine Cycle

Volume 6A: Energy ◽

10.1115/imece2014-38570 ◽

2014 ◽

Cited By ~ 1

Author(s):

Mostafa H. Sharqawy

Keyword(s):

Mass Concentration ◽

Heat Engine ◽

Thermodynamic Cycle ◽

High Mass ◽

Permeable Membrane ◽

Thermal Reservoir ◽

Thermodynamic Conditions ◽

Heat Engine Cycle ◽

Positive Work ◽

Engine Cycle

A new thermodynamic cycle is proposed named mass engine cycle. In the proposed cycle, mass is transferred from a high mass concentration reservoir to the cycle, mass is rejected to a low mass concentration reservoir, and a net positive work is generated. This is similar to heat engine cycles where heat is transferred from a high temperature thermal reservoir (heat source) to the cycle; heat is rejected to a low temperature thermal reservoir (heat sink), and a net positive work is generated. The heat engine cycle uses heat exchangers to transfer heat between the cycle and the thermal reservoirs, while the mass engine cycle uses membrane mass exchangers which transfer mass between the cycle and the mass reservoir. These membrane mass exchangers transfer water through a semi-permeable membrane and reject other substances. The driving force for the mass transfer is the hydrostatic and osmotic pressure differences. Similar to Carnot limit of the thermal efficiency of the heat engine cycle, a theoretical limit is obtained for the proposed mass engine cycle under reversible thermodynamic conditions.

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