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'[PICLIST] Antwort: [OT]: Car Radiator for Air Cond'
2002\06\21@051809 by Martin Buehler

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thanks for the hints.
shure, i can build the whole thing and measure...
...but i would like to do some calculations to see if it's worth to start
a project and buy all the components i need.
tino





John <spam_OUTjsandTakeThisOuTspamPIXIE.CO.ZA>
Gesendet von: pic microcontroller discussion list <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
20.06.02 17:01
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       An:     PICLISTspamKILLspamMITVMA.MIT.EDU
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       Thema:  [OT]: Car Radiator for Air Conditioning


Hello Martin & PIC.ers,

Can't you short-circuit all the thermodynamic calcs.?...and get a ballpark
estimate from:

1.     You have prior knowledge of the car model the radiator came from.
2.      You know what it's engine power rating was, assuming full load
       running condition.
3.    Petrol (Gas., for the N. American vocab.-challenged types here..),
or
       diesel engines have predictable efficiencies, thus radiator
       work-rates  (=power dissipation).

etc...etc...,  even if you don't know all these you might be able to find
the data you want by measuring the performance of an actual system
in equilibrium.
Car goes at certain speed into wind, measure (on sequential runs,
not necessarily simultaneously):
1.  water temperature at inlet and outlet of radiator.
2.  air temp before and after radiator.
3.  Coolant flow rate..mmm... disconnect water pipe & stopwatch it filling
       a container, at the same revs as the road test  ??


                   best regards,   John


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products and services.

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2002\06\21@054553 by Roman Black

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Martin Buehler wrote:
>
> thanks for the hints.
> shure, i can build the whole thing and measure...
> ...but i would like to do some calculations to see if it's worth to start
> a project and buy all the components i need.
> tino


Why not connect a rubber hose to a water tap,
stick the radiator in front of a small household
style fan-heater, and measure air temp in/out with
your tapwater running through? Flow rate can be
measured with a watch and measuring cup.
Sounds like a 10 minute job. You can use decent
duct tape to connect any size hose to the tap and
radiator, it doesn't have to last! :o)
-Roman

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2002\06\21@075047 by Peter L. Peres

picon face
On Fri, 21 Jun 2002, Roman Black wrote:

>Martin Buehler wrote:
>>
>> thanks for the hints.
>> shure, i can build the whole thing and measure...
>> ...but i would like to do some calculations to see if it's worth to start
>> a project and buy all the components i need.
>> tino
>
>
>Why not connect a rubber hose to a water tap,
>stick the radiator in front of a small household
>style fan-heater, and measure air temp in/out with
>your tapwater running through? Flow rate can be
>measured with a watch and measuring cup.
>Sounds like a 10 minute job. You can use decent
>duct tape to connect any size hose to the tap and
>radiator, it doesn't have to last! :o)
>-Roman

This will work but the fan throughput also needs to be measured, both in
temperature differential and in air mass. That is not so easy.

Peter

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