* Posts by Adrian Lai

4 posts • joined 29 Feb 2008

Enertia e-bike wheeled into shops

Adrian Lai

Re: Sir Clive Sinclair

Well, he might be, except he's not dead.

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HP shatters excessive packaging world record

Adrian Lai

Game

Tut, and they opened all of them?

Ruined a perfectly good game of pass the parcel :(

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Mobo maker builds 'powerless' processor cooling fan

Adrian Lai

@Dave Bell & Ian Rogers

Yes, I used Kelvin for my calculation, as quick and simple use of a calculator would demonstrate. It should be obvious from sight that 1-(20/60) is not going to equal 0.12 in any case.

However, for readability, I provided celsius equivalents.

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Adrian Lai

Efficiency.

A Stirling Engine is just a particular type of heat engine.

Heat engines have a maximum theoretical efficency of 1-(T_c/T_h),

Where T_c is the "cold" temperature, and T_h is the "hot" temperature.

Given, say, temperatures of 20 and 60 degrees celsius, you'd get a maximum efficency value of about 12%.

The 70% figure is presumably 70% of 12% (~ 8.5%).

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