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laxman · 02-05-2006, 11:36 AM

I know that not having a chiller is a major problem but right now I cant afford a $3000 chiller. Secondly I will probably make a chiller using peltiers when I get around to it. As it does not take that much power (peltier wise) to cool to room temp (I'm thinking 120 to 150 watts of cooling power) but that hard part is generating a control circuit that will be able to maintain a stable temp. This I will look into a much later time but I am hoping to build a "chiller" that can hold outlet a +-.5c. Blue I recognize that response time is very important but in this case it is a little less so. This is simply because the temps need time to stabilize (which are much greater the the response time) so this gives time for the machines to "catch up" but yes it is something I am worried about. Also I know that repeatability and drift are insanely important and they are the biggest problem for this bench. Well I should say drift is, if I am claiming that my bench is a good comparison over time then my instruments can not drift and need to be recalibrated often. To say the least I have been thinking a lot about all the afore mentioned topics and trying to find the cost effective middle ground.

Just a small update on equipment bought:
digitec 5810
Swissflow flow meter
HP multimeter (I cant remember the model but I will probably replace it)
Regulated 30v 10a power supply
Delta 0-100" Dp meter (I know the scale is to small but for now it will do)
Cole parmer 8502 thermometer
Cole parmer thermistors

Also blue I so jealous I would love to have a large budget. Also Robo I am jealous of your bench it is what I hope mine will turn out like.

02-05-2006, 11:36 AM	#37
laxman Cooling Neophyte Join Date: Oct 2005 Location: evanston Posts: 41	Re: Giving my test equipment away? I know that not having a chiller is a major problem but right now I cant afford a $3000 chiller. Secondly I will probably make a chiller using peltiers when I get around to it. As it does not take that much power (peltier wise) to cool to room temp (I'm thinking 120 to 150 watts of cooling power) but that hard part is generating a control circuit that will be able to maintain a stable temp. This I will look into a much later time but I am hoping to build a "chiller" that can hold outlet a +-.5c. Blue I recognize that response time is very important but in this case it is a little less so. This is simply because the temps need time to stabilize (which are much greater the the response time) so this gives time for the machines to "catch up" but yes it is something I am worried about. Also I know that repeatability and drift are insanely important and they are the biggest problem for this bench. Well I should say drift is, if I am claiming that my bench is a good comparison over time then my instruments can not drift and need to be recalibrated often. To say the least I have been thinking a lot about all the afore mentioned topics and trying to find the cost effective middle ground. Just a small update on equipment bought: digitec 5810 Swissflow flow meter HP multimeter (I cant remember the model but I will probably replace it) Regulated 30v 10a power supply Delta 0-100" Dp meter (I know the scale is to small but for now it will do) Cole parmer 8502 thermometer Cole parmer thermistors Also blue I so jealous I would love to have a large budget. Also Robo I am jealous of your bench it is what I hope mine will turn out like.