Search found 5 matches

by joedog44
Tue Feb 10, 2015 2:46 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Low temp difference beta help
Replies: 15
Views: 7600

Re: Low temp difference beta help

ah ok, well i was planning on running the setup vertical, having the hot side of the cylinder fixed to the top of the hot water tank. the mid section of the cylinder to be taken down on the lathe to cut down on heat transfer. The cooling side of things, i am going to run a combination of cooling fin...
by joedog44
Tue Feb 10, 2015 2:11 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Low temp difference beta help
Replies: 15
Views: 7600

Re: Low temp difference beta help

yeah, expansion piston would be my displacer. the heat source is the waste heat from a domestic hot water cylinder, so i'm taking the high temperature as 80 deg C. i've not seen any LTD beta engines which is why the design phase is a real struggle. Theres very little to take examples from.
by joedog44
Tue Feb 10, 2015 10:24 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: Low temp difference beta help
Replies: 15
Views: 7600

Re: Low temp difference beta help

hi gents, thanks for your replies. i have done some calculations, all based on ideal cycle, heat transfer, zero friction etc, dead space etc. i need to produce about 0.7 watts, my design is based on an estimated indicated engine power of 1.45 watts with the following dimensions: cylinder diameter : ...
by joedog44
Wed Jan 28, 2015 3:40 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Low temp difference beta help
Replies: 15
Views: 7600

Re: Low temp difference beta help

hi, thanks for your reply. i've not got a set power requirement. The brief i've been giving just says a nightlight, speaking to my supervisor as long as it can light an led, that classes as a nightlight. I'm going to power it with a linear alternator running off the crank because i doubt i can make ...
by joedog44
Wed Jan 28, 2015 1:58 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: Low temp difference beta help
Replies: 15
Views: 7600

Low temp difference beta help

hello people. First off like to say this forum is great. i'm a student like a lot of people on here asking questions, and the information here has been really helpful. For a pretty big project of mine i have to design a stirling engine to power a nightlight with a temperature difference of only 65 d...