Post by thread:[PICLIST] Antwort: [OT]: Car Radiator for Air Cond

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_OUTjsandTakeThisOuTPIXIE.CO.ZA> Gesendet von: pic microcontroller discussion list <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> 20.06.02 17:01 Bitte antworten an pic microcontroller discussion list An: PICLISTKILLspamMITVMA.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 {Quote hidden}>Date: Wed, 19 Jun 2002 15:39:37 +0200 >From: Martin Buehler <.....Martin.BuehlerKILLspam.....ASCOM.CH> >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: EraseMEjsandspam_OUTTakeThisOuTpixie.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

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 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

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 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads