Here's a breakdown of where to find them, along with some considerations:
1. Specialty Suppliers and Manufacturers:
* Stirling Engine Research and Development Companies: These are your best bet for high-performance, research-grade engines. Companies like Sunpower, Stirling Energy Systems, Infinia (though their product line is evolving), and Sun Machines are good places to start. Be prepared for higher prices and more technical support.
* Other Manufacturers: Search online for "Stirling engine manufacturer" or "Stirling engine supplier". You might find smaller companies specializing in specific types or applications.
2. Online Marketplaces:
* Amazon: While you might find some basic demonstration models, it's unlikely to find a powerful, commercial-grade engine here.
* eBay: Could offer some used or vintage engines, but be cautious about quality and condition.
* Etsy: A good source for unique, handcrafted Stirling engines, often small-scale and for hobbyists.
3. Educational Suppliers:
* Educational Science Supply Companies: Companies like Edmund Scientific, Carolina Biological Supply, and Fisher Scientific often carry smaller, educational Stirling engine models.
Things to consider when buying a commercial Stirling engine:
* Power Output: What kind of power do you need? Small engines (under 1kW) are good for demonstration and hobby purposes. Larger engines (above 10kW) can power machinery.
* Fuel Type: Most Stirling engines run on a heat source, like gas, diesel, or solar energy.
* Application: What will you use the engine for? Research, energy generation, or something else?
* Budget: Stirling engines can range in price from a few hundred dollars to tens of thousands of dollars.
* Availability: Not all companies offer their engines for sale to the public.
Don't be afraid to contact the manufacturer or supplier directly to get specific information about availability and pricing.
Remember: Buying a commercial Stirling engine is a serious investment. Do your research and find the right one for your needs.
