On Fri, 01 Jun 2018 11:25:02 +0100, Dave Plowman (News) wrote:

In article ,
Sam wrote:


"Dave Plowman (News)" wrote in message
...
In article ,
Sam wrote:
Isn't it a damn sight easier to hold a temperature 15C away from room
temperature than 180C away?

Not when you do it with a compressor with the fridge instead of an
electrical heater with the oven.

Not quite sure why. At basics, both are simpl1y switched off when they
reach the required temperature, and on again when needed to maintain that.

You get much finer control with the electrical heater.

That is simply down to the thermostat design - hysteresis, etc.

Or the compressor taking a while to get going? If I turn on a resistive element, I get heat immediately. If I turn on a compressor, a few minutes pass before cooling takes place, and another few minutes for it to stop cooling when I turn it off. Even if a fridge stat had a hysteresis of 0.00001C and the air inside the fridge was blown around by a fan, so perfectly even, it would still continue to cool after the compressor was turned off due to the thermal capacity of the coolant in the internal pipes.

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