Analysis of a bladeless steam turbine for use in a domestic combined heat and power system Peter Burton
Edinburgh Napier university
This report analyses the suitability of a bladeless ‘Tesla’ type steam turbine to determine its merit for use in a domestic combined heat and power system. A physical prototype was developed and built so that cost and performance data could be determined. With this done, a cost analysis was prepared to evaluate its performance when integrated into a theoretical Rankine cycle CHP system. The performance of the system was then compared with that of other CHP systems currently on the market. It was determined that the capital cost of the system was much lower that other systems however its efficiency was far lower.
Table of figures
Background of steam
The impulse steam turbine
Impulse type design
Radial type design
Combined Heat and Power
Steam engine selection
Bladeless turbine design
Fluid to disk power transfer
Sizing of disks
Disk number and spacing
CAD in design process
Measuring power output
Cost analysis of turbine in CHP system
Providing a useful electrical output
Comparison with competing systems
Biomass Stirling CHP
Product lifecycle analysis
Using the turbine with a solar system
Limitations of analysis
Comparison with other systems
Health and Safety
Scope of work
Flow rate and disk spacing
Heat exchanger analysis
Condensate in the turbine.
Effect of disk number on performance
Organic Rankine cycle
Consideration of open loop steam system
Table of figures
Figure 1 Flow of fluid through a parsons turbine (http://boomeria.org/physicstextbook/ch9.html)
Figure 2 Three stage impulse steam turbine
Figure 3 Rankine cycle
Figure 4 Example of a micro gas turbine produced by ‘Bladon Turbines’ (http://www.ploong.com/dissecting-the-sophistication-of-the-jaguar-c-x75-technology/micro-turbine-gas-bladon-jets-on-jaguar-c-x75)
Figure 5 Compressor and turbine blades from the Capstone turbine
Figure 6 Example of Compressor and turbine blades from a typical turbocharger
Figure 7 Cutaway diagram showing internals of capstone turbine design
Figure 8 diagram of tesla turbine
Figure 9 Graph showing the typical relationship between efficiency and output for bladed and non-bladed turbines.
Figure 10 Diagram of energy distribution in Domestic gas CHP system
Figure 11 Cutaway diagram of SunMachine biomass CHP boiler
Figure 12 Greensteam 'Z8' steam engine
Figure 13 one of tesla's original turbine designs
Figure 14 40mm shaft
Figure 15 Power/Speed graph 1st generation
Figure 16 Power/Speed graph 2nd generation
Figure 17 Speed/Power graph 3rd generation
Figure 18 Speed/power graph 4th generation
Figure 19 Proposed CHP system
Figure 20 Picture of Lynx Steam boiler design
Figure 21 HDG PM15 self-feeding pellet boiler
Micro generation is growing in popularity as it offers the user the ability to supplement...
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Joel Weisman, L. E. (1985). Modern power plant engineering. Prentice-Hall.
LynxSteam. (2010, 03 19). http://www.youtube.com/watch?v=4Ift3UNKLvs.
Rice, W. (2003). Handbook of Turbomachinery. Dekker mechanical engineering.
Smiley, A. G. (2009). Experiment and analysis for improved design of the inlet and nozzle in tesla disk turbines. Bristol: University of Bristol.
Tesla, N. (1913). Patent No. US Pat. 1 061 206. USA.
U.S Energy Information Administration. (2012, January). U.S Energy Information Administration, Independent statistics and analysis. Retrieved February 28th, 2012, from www.eia.gov/electricity/monthly/pdf/epm.pdf
Calculation,’’ M.S. Thesis, Department of Mechanical and Aerospace
Engineering, Arizona State University, May (1986)
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