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 […]

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 […]

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 […]

Stirling Engine Simulator & Guide

The Stirling engine simulator is a simple isothermal cycle simulator for Stirling engines. The guide below should be helpful to those interested in using the simulator. Although it’s a fairly simple simulator, you can learn a lot about Stirling engine design by trying out different designs and operating conditions. What is it? The Stirling engine […]

Ideal Stirling Cycle Spreadsheet

Ideal Stirling Cycle Spreadsheet V02

  This Excel 2003 spreadsheet stirling-cycle-ideal-v-02 lets you input the basic values for a Stirling cycle engine and calculates various quantities such as pressures, work in, work out, heating, cooling, and ideal efficiency. Don’t use this spreadsheet with the idea that your engine will get close to the values it shows unless you have an […]