Gamma-Type Stirling Motor-Driven Compressor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.659.377 ◽

2014 ◽

Vol 659 ◽

pp. 377-382 ◽

Cited By ~ 1

Author(s):

Vlad Mario Homutescu ◽

Dan Teodor Balanescu

Keyword(s):

Mathematical Model ◽

Thermodynamic Cycle

Paper is analyzing an engine-driven gamma-type Stirling compressor by means of an isothermal physico-mathematical model. The maximum performances of an engine-driven gamma-type Stirling compressor (working after a quasi-Stirling thermodynamic cycle) are obtained. By using these maximum performances as reference, a comparison between different physical embodiments of engine-driven gamma-type Stirling compressors can be achieved.

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Simulation Model of the Thermodynamic Cycle of a Three-Cylinder Double-Acting Steam Engine

Chemical Product and Process Modeling ◽

10.2202/1934-2659.1198 ◽

2008 ◽

Vol 3 (1) ◽

Author(s):

Evzen Thoendel

Keyword(s):

Mathematical Model ◽

Thermodynamic Cycle ◽

Steam Pressure ◽

Heat Energy ◽

Point Of View ◽

Steam Engine ◽

Pressure Reduction ◽

Software Environment ◽

The Mathematical Model ◽

Pressure Reduction Station

Today, steam engines are used for special purposes only, for example to reduce steam pressure in pressure reduction stations, where they replace the traditional and inefficient throttling process. Throttling is the most used way to control the pressure in steam reduction stations. This way is unsatisfactory from the economical point of view, because the exergy is lost uselessly. It is a part of heat energy that can perform a work. The better way of a pressure reduction is an expansion in a backpressure turbine or in a steam engine by simultaneous transformation of the heat energy into electricity (cogeneration). This article describes the design and implementation of the mathematical model of a steam engine used as pressure regulator in a pressure reduction station. The present model is a part of a comprehensive mathematical model of a cogeneration unit and also a part of the author's doctoral thesis. The model assumes detailed mathematical description of physical processes in a steam engine and implementation in an MATLAB-SIMULINK software environment.

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Solar Thermal Water Pumps: A Preliminary Analysis of the Working Process

Journal of Solar Energy Engineering ◽

10.1115/1.1767191 ◽

2005 ◽

Vol 127 (1) ◽

pp. 29-36 ◽

Cited By ~ 5

Author(s):

K. Mahkamov ◽

E. P. Orda

Keyword(s):

Mathematical Model ◽

Thermal Water ◽

Low Cost ◽

Thermodynamic Cycle ◽

Solar Thermal ◽

Maximum Temperature ◽

Working Fluid ◽

Water Pump ◽

Dynamic Head ◽

Water Pumps

Solar thermal water pumps are low cost and low maintenance devices with a pumping capacity of 0.2-1m3/hour at a dynamic head of 1.5–5 m. The working fluid in the thermodynamic cycle is an air-steam mixture. In this paper we suggest a simple mathematical model to numerically simulate the internal processes in such a pump and determine the performance and physical dimensions of a preliminary design. The proposed mathematical model has been calibrated against experimental data and it provides the numerical simulation of the processes which occur in the cycle within an acceptable degree of accuracy for engineering purposes. The results of the analysis show that the performance of the solar water pump is mainly determined by the “steam” fraction of the cycle. The power of the solar thermal water pump increases with an increase in the maximum temperature in the cycle, while the indicated efficiency reduces because of the increase in the heat loss due to water vaporization and condensation processes.

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Physico-Mathematical Model of the Theoretical Gamma-Type Stirling Motor-Driven Compressor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.659.383 ◽

2014 ◽

Vol 659 ◽

pp. 383-388

Author(s):

Vlad Mario Homutescu ◽

Dan Teodor Balanescu

Keyword(s):

Mathematical Model ◽

Thermodynamic Cycle ◽

Absolute Maximum ◽

Isothermal Compression ◽

Expansion Process ◽

Isothermal Model ◽

Heating And Cooling ◽

The Absolute ◽

The Ideal

Paper is analyzing a physico-mathematical isothermal model of the theoretical engine-driven gamma-type Stirling compressor. The absolute maximum performances of an theoretical engine-driven gamma-type Stirling compressor (that function after a thermodynamic cycle comprising two isochoric processes of heating and cooling the agent, one isothermal compression and one partially-cooled expansion process) are obtained. Using these absolute maximum performances as reference, it is possible to assess the degree in which several real physical constructions of this machine can approach to the ideal functioning.

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Investigation of the Working Cycle of a Metal Hydride Heat Transformer for Upgrading Waste Heat

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1243/pime_proc_1996_210_023_02 ◽

1996 ◽

Vol 210 (2) ◽

pp. 157-163 ◽

Cited By ~ 1

Author(s):

A V Kuznetsov

Keyword(s):

Mathematical Model ◽

Mass Transfer ◽

Pressure Drop ◽

Metal Hydride ◽

Waste Heat ◽

Thermodynamic Cycle ◽

Transfer Processes ◽

Working Cycle ◽

Mass Transfer Processes ◽

Heat Transformer

This paper presents an investigation of the working cycle of a metal hydride heat transformer for upgrading waste heat. A mathematical model for calculation of the heat and mass transfer processes in the metal hydride heat transformer is suggested. The method for balancing the heat and mass exchanges in the thermodynamic cycle is developed. This method essentially takes into account the pressure drop inside a reacting hydride bed.

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Autonomous Power Station Based on Rotary-Vane Engine with an External Supply of Heat

Environment Technology Resources Proceedings of the International Scientific and Practical Conference ◽

10.17770/etr2013vol2.842 ◽

2015 ◽

Vol 2 ◽

pp. 97

Author(s):

Mikhail Andreev ◽

Yuriy Zhuravlev ◽

Yuriy Lukyanov ◽

Leonid Perminov

Keyword(s):

Mathematical Model ◽

Angular Displacement ◽

Structural Complexity ◽

Thermodynamic Cycle ◽

State University ◽

Physical Processes ◽

Working Medium ◽

Heat Intake ◽

External Combustion ◽

The Mathematical Model

Rotary-vane engine (RVE) with an external supply of heat is an aggregate consisting of two modules with a common output shaft, the heating device (heater) of working medium and the cooling device (cooler) of working medium, which connected with inlet and outlet ports of modules by system of pipeworks. Each module has two rotors with two vanes on each. Between the corresponding plane surfaces of the four vanes four working volumes are formed wherein thermodynamic cycle steps: ingress, compressing, heat intake, expansion stroke, discharge, outward heat transmission are going simultaneously. The angular displacement of modules relative to one another occurs pumping the working medium through the heater and cooler, which allows the conversion of thermal energy into mechanical work. Design features of the RVE with an external supply of heat allows create a closed gas-vapor cycle. The main specified advantages of the RVE with an external supply of heat are: fewer noxious emissions, multifuel capability, high motor potential (service life). Different problems of creation external combustion engines such as structural complexity of construction units, absence of adequate mathematical model of designed RVE with an external supply of heat are also pointed. The construction of the RVE with an external supply of heat developed in Pskov Polytechnic Institute (now the Pskov State University), the operation concept of the engine, the physical processes in the chamber modules RVE with an external supply of heat during each step and the mathematical model describing the physical processes proceeding in chamber RVE with an external supply of heat modules are considered.

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