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 Gesendet von: pic microcontroller discussion list 20.06.02 17:01 Bitte antworten an pic microcontroller discussion list An: PICLIST@MITVMA.MIT.EDU Kopie: 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 >Date: Wed, 19 Jun 2002 15:39:37 +0200 >From: Martin Buehler >Subject: Antwort: Re: [OT]: Car Radiator for Air Conditioning > >thanx for the info, but as you can see in the original question, i do not >have pressure problems, as this is a low pressure system. >i need data to calculate the thermal transition based on airflow, >waterflow and temperature difference! >thanx >tino e-mail from the desk of John Sanderson, JS Controls. Snailmail: PO Box 1887, Boksburg 1460, Rep. of South Africa. Tel/fax: Johannesburg 893 4154 Cellphone no: 082 741 6275 email: jsand@pixie.co.za Manufacturer & purveyor of laboratory force testing apparatus, and related products and services. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads