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From: Grimly Curmudgeon on 21 Apr 2010 15:50
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Pete M
<pete.murray(a)SPAMFREEblueyonder.co.uk> saying something like:

>If memory serves me right, the a/c system in a Bentley produces the
>equivalent cooling as 16 domestic fridges.

So, that's about four football pitches, right?
From: Peter Hill on 21 Apr 2010 18:10
On Sat, 10 Apr 2010 13:00:22 +0100, Kevin Poole
<jan2009(a)mainbeam.co.uk> wrote:

>Michael Kilpatrick wrote:
>> Would anyone happen to have a vague idea of the power rating of a
>> typical car air condition system (such as that in a Rover SD1)? I'd like
>> to have a ball-park figure for the wattage (or any scalar equivalent
>> such the British Thermal Units per hour) as a measure of the heat
>> transfer that such a system is capable.
>>
>My books tend to stop at about the time air-conditioning became common.
> Presumably they have a coefficient of refrigeration of 2 or 3(?), so
>several times the input power to the compressor is being dissipated.
>
>> For example, I think I've read somewhere that the radiator for a typical
>> car engine water-cooling system might dissipate about 3kW
>
>Greene & Lucas "Testing of Internal Combustion Engines", 1969 show
>typically 30-odd percent of the input energy being dissipated through
>the radiator, so rather more than the maximum mechanical output of the
>engine. An SD1, with a power of 150-ish bhp, would have a radiator
>capable of getting rid of at least 150kW, or whatever that is in
>ton-acres/cubic fortnight.

It's normal to use consistent units, SI with SI and Imperial with
Imperial. So bhp with BTU/h and kw with kw.

Engine with 110Kw output would need 150Kw rad. A 150bhp engine a
512276.9 BTU/h rad. In practice it's usual for rads to be much bigger
than the rated power would require.

What are you doing with that book? Mines a '69 edition too. I'm not
sure if it's permitted for 2 people in a newsgroup to have the same
reference library.
--
Peter Hill
Spamtrap reply domain as per NNTP-Posting-Host in header
Can of worms - what every fisherman wants.
Can of worms - what every PC owner gets!
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