Power output measurement of the PE 2 Stirling engine

Calibration for motor load

This article covers power measurements for the PE 2 3D printed Stirling engine. The net output power (the useful power) plus the frictional losses measured earlier are combined with other test data and simulation results to more fully understand this engine’s performance. The techniques and data should be useful for others designing Stirling engines, especially […]

A regenerator for the 3D printed PE 2 Stirling engine

Diagram of the regenertor in the PE 2 engine

This post will examine some of the practical and theoretical aspects of a regenerator as it applies to the 3D printed PE 2 Stirling engine. Those who just want to build a regenerator for the engine and get good performance, will find what they need here too. The above data show my tests of the […]

Power piston sizing for Stirling engines

Power piston and displacer sizing chart for Stirling engines

One of the more difficult yet critical issues in designing your first Stirling engine is deciding on the correct power piston displacement. My earlier discussion of power piston sizing did not satisfy a lot of people. So I’m going to make this one very simple to apply. For me to suggest the right size power […]

Tamera video of Sunvention SunPulse engine

sunpulse power piston1A

I came across this video of an interesting large, low-temperature Stirling engine. You’ll need to get to about 1:30 before it gets interesting. The following numbers are based on what I have seen in the above video or statements the speaker has made and in a few cases, guesses based on what I can see. […]

Improving solar power when the sun is low in the sky

Light transmission1

Tests on my solar-powered Stirling engine determine it will run with a solar incidence angle of up to 59 degrees, but I would like the engine to work up to 66 degrees incidence or 24 degrees above the horizon. This number is selected because that is the angle that would allow the engine to run […]

Power Piston Sizing

Engine 3F sim

How big should your Stirling engine power piston be? (Be sure to see my more recent post on power piston sizing. It provides more specific information. — Doug Conner) A common problem Stirling engine designers face is how much volume should the power piston sweep in comparison with the displacer? This of course only applies […]

Engine 3F Efficiency Analysis part 4

Rev 1: See details at bottom. Let me summarize what has been covered and what remains in this efficiency analysis: Component Power percentage of total power Efficiency analysis Heat lost directly to the environment 40.3w 58.4% Part 1 Thermal shorting: heat conduction directly from the hot end to the cold end 5.9w 8.6% Part 2 […]

Engine 3F Efficiency Analysis part 3

Let me summarize what has been covered and what remains in this efficiency analysis: Component Power percentage of total power Efficiency analysis Heat lost directly to the environment 40.3w 58.4% Part 1 Thermal shorting: heat conduction directly from the hot end to the cold end 5.9w 8.6% Part 2 Gross engine power: includes net shaft […]

Engine 3F Efficiency Analysis part 2

Continuing with the analysis of where the input power (heat) to the engine goes, the next item to consider is the conduction loss often referred to as thermal shorting. Conduction losses A Stirling engine of gamma configuration, such as the one being considered, uses a displacer to shuttle the operating gas back and forth between […]

Engine 3F Efficiency Analysis part 1

IMG_2641E1

In an earlier post I measured 1.05 watts output from my engine 3F using a 69 watt input. This computes to 1.5% efficiency. So where did the other 68 watts go? The following is my analysis of where all the energy went. It won’t be as rigorous as I would like, partly due to lack […]