May 15, 2019

Big LTD Stirling engine High Temp Parts

Big LTD Stirling engine High Temp Parts. Low temperature differential Stirling. Originally build for solar operation when combined with a Fresnel lens this LTD stirling engine runs at 600 rpm or more with only 200F temperature delta. When a Stirling engine has a Low Temperature Differential it means that it can run when the hot side is not much warmer than the cold side. The differential / delta, is the difference / ratio between the two. The displacer cylinder of this ltd stirling engine is made of glass and transfers very little heat to the cold side of the engine by convection. Both end plates are made from used aluminum stove top pans, with a groove cut into both to centrally locate the glass cylinder. The power piston is made of cast iron and is approximately 2” diameter, 2” stroke. The hot side piston runs in a heavy steel pipe bored and honed on a Logan lathe.

This engine engine is shown being tested on a gas burner out put of 3-5000btu, and water in the upper or cold side of the engine. For operation in a solar application the engine would be run upside down with the lens focused on the bottom and the top half shaded by the rest, of the engine. A preliminary test of the engine under solar power configured with a Fresnel lens of 32”x42” showed hot end temperatures in excess of 400f, and a cooling side of 150f. As a side note, When I first hatched the plans for this engine, It was to have set in the center of an inflated inner tube a floated around the swimming pool as a heater. :-) Displacer cylinder diameter is 6.25” and is stroking 3” / power piston is made of cast iron and is approximately 2” diameter, 2” stroke. Displacer piston material is commercial grade Scotch Brite floor sanding disks. The ltd engine is constructed entirely of steel and other metals with the exception of some high temperature sealant rated to 450f and the displacer piston material. differential low temperature difference Stirling engine

I literally build a very big LTD stirling engine from cans. I melt aluminum cans to pour molten metal into tin can mould casting for the power piston. Turn the cast piston on my logan lathe. Trepan cut, face groove, the hot and cold end plates of the displacer cylinder on the 40939 mill to fit the glass cylinder body. Bore copper tubing and steel pipe on the lathe for the power piston cylinder. Then upgrade the aluminum piston to one made of cast iron. This large size ltd stirling engine is water cooled a runs approximatly 800 rpm with the cold side at 110f , hot side 325f. It has a cast iron flywheel of 10” and 5lbs 9r a 14” bicycle wheel. = SHARE ROCKNTV1