why the stirling motors are not frequently used ?

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Offline myriam

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hi there

I was wondering about the use of this motor which is as I think an amazing technology and the  most important "green technology".
why it is not often used, I mean I've never   seen this motor associated with replacing the common motor in factories  or....

is it inefficient ?
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Offline peppercorn

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why the stirling motors are not frequently used ?
« Reply #1 on: 07/10/2010 13:54:45 »
They are becoming more popular for solar thermal applications. See:
http://en.wikipedia.org/wiki/Solar_thermal_energy#Dish_designs


http://en.wikipedia.org/wiki/Stirling_engine#Analysis
"Compared to an internal combustion engine of the same power rating, Stirling engines currently have a higher capital cost and are usually larger and heavier. However, they are more efficient than most internal combustion engines.  ...  For applications such as micro-CHP, a Stirling engine is often preferable to an internal combustion engine.  ...  However, Stirling engines are generally not price-competitive as an automobile engine, due to high cost per unit power, low power density and high material costs."

So, even though they are more efficient, a Stirling's initial outlay and space impacts mean they are unlikely to replace diesel prime movers, etc in industry unless they are used as part of a CHP system.

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Offline myriam

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why the stirling motors are not frequently used ?
« Reply #2 on: 07/10/2010 14:12:15 »
maybe the stirling engine is more expensive but what it  can do is expensive too,  like the electricity for example


http://www.cnccookbook.com/CCStirlingGenerator.htm
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