## 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 […]

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 […]

## The Stirling Cycle—Ideal and Practical

Click on photo to enlarge   The above diagram of the ideal Stirling cycle shows how a displacer-type engine (gamma configuration) would implement the cycle. Note that the displacer and power piston operate independently. During the expansion and compression phases the power piston moves and the displacer is stationary. During the heating and cooling […]

## Flywheel Spin-down work measurements

One way to measure the friction on a rotating machine such as an engine or motor is to spin it up and record the appropriate data while it slows down without power. By measuring the time elapsed between two RPM measurements and knowing the moment of inertia, you can compute the lost energy from the […]

## Solar Heat

Solar Power—Radiation from the sun received on Earth Here is some basic information for those interested in converting solar radiation into power. At the average earth-sun distance of 92.9 million miles the solar radiation intensity is: 435 BTU/(ft2-hr) or 1370 watts/meter2.   After going through the atmosphere and reaching the ground the values drop to: 340 […]

## How much heat to raise the temperature?

Everyone knows it takes heat to raise the temperature of something, whether it’s the air in your house or a kettle on the stove. If you want to design heat engines or use solar power to elevate the temperature of something, it helps if you can determine how much heat you need.   To begin […]