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University of Virginia: How Things Work
A site maintained by A. Bloomfield, the author of "How Things Work: The Physics of Everyday Life." You can read old questions or ask Bloomfield your own. Great explanations of everyday physics.
![Thermal Physics Module: Refrigerators and Heat Pumps [Pdf] Website](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "Thermal Physics Module: Refrigerators and Heat Pumps [Pdf] Website")
University of Sydney (Australia)
Thermal Physics Module: Refrigerators and Heat Pumps [Pdf]
Refrigerators and heat pumps are described. Their operation is explained and the variables which improve their efficiency is discussed.
MadSci Network
The Mad Scientist Network: Physics
A page from the question and answer section of this useful site. The page responds to the user question: "Explain convection to me in terms I can understand." An excellent discussion of the method of convection.
University of Sydney (Australia)
Thermal Physics Module: Heat Engines [Pdf]
The second law of thermodynamics and the concept of entropy is applied to the topic of heat engines. The Carnot and Stirling engine are discussed. Efficiency is explained and an equation is derived.