Help in calculations needed

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julesletters
Posts: 2
Joined: Wed Aug 30, 2006 2:08 pm
First Name: Justin
Last Name: Dowell

Help in calculations needed

Post by julesletters »

I looked everywhere I could before bothering anyone with a post, as I
myself have trouble with forming replies to questions asked.
However, I am unable to find details concerning how to calculate
Stirling engine RPS and watts. I have looked over Schmidt's theory
many times, and purused several dozen websites and .pdfs, including
those for educational, commercial, and recreational purposes.

Having exhausted said options, I turn here with my question: How may
the Revolutions Per Second and Watts of a Stirling engine be
determined? I do not have the means to construct one, nor the method
for physically testing and measuring the output it if I did. My
engine exists only as numbers on paper.

ANY help will be GREATLY appreciated.


Though a method would be prefered to an answer, I provide the
statistics:

The gas in the expansion space can be prevented from dropping under
330ºK.

The surface area of the compression space remains at 273ºK.

Swept volume of expansion piston: 4.31754 m^3

Swept volume of compression piston: 4.31754 m^3

Dead volume of expansion space: 3.53961 m^3

Dead volume of compression space: 3.53961 m^3

Dimensions of dead volume containers: 1.524 m * 1.524 m * 1.524 m

Dimensions of swept volume for pistons: 1.524 m * 1.524 m * 1.859 m

Gas Constant (He): 2078.5 J/(mol*ºK)

Engine Pressure: 2068430 Pa == 300 PSI


Alternatively (or perhaps in addition), a 0.371612 m^2 surface area
of the expansion space can be heated and kept at a constant 600.3ºK.
However, the cost increases rapidly for this method as the surface
area increases, though actual power output difference between using
this surface-area-heat and the constant-volume-heat eludes me.

Thanks in advance!
julesletters
Posts: 2
Joined: Wed Aug 30, 2006 2:08 pm
First Name: Justin
Last Name: Dowell

Response to Help in calculations needed

Post by julesletters »

A minor error I overlooked when first posting lead to silly wording. The corrected information is as follows: The temperature of the surface area of the compression space remains at a constant 273ºK.

glenn.mh.dk
Posts: 3
Joined: Sun Jan 14, 2007 12:34 pm
First Name: Glenn
Last Name: Moeller-Holst

Response to Help in calculations needed

Post by glenn.mh.dk »

Hi Justin

Look at:

Simple Performance Prediction Method for Stirling Engine:
http://www.bekkoame.ne.jp/~khirata/acad ... implee.htm

Peter Fette: Stirling Engine Research and Computer (simulation) Programm Development:
http://home.germany.net/101-276996/fette.htm#e
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