Sensitive information section

[buffo]

a sp running similar to those parameters needs to dissipate close to 13KW

Yeah, it's actually a puzzler... Factory manual states the max heat load is just 5.6 KW for the I-60 and 8.75 KW for the I-70. Neither figure really jives with the stated max tube current of 35 amps and a tube voltage of 215V DC though (not to mention the nearly 1KW flowing through the magnet windings), so maybe the manual is wrong. I plan to do some measurements once I get it up and running...

Either way though, it's still a lot of heat, so any chiller system is going to be fairly involved. I've talked to several people who have had success running tubes as large as a Lexel-95 on semi-closed loop, fan-cooled recirculators with large water reservoirs, but I'm not thrilled with the idea of setting up a 35 gallon trash can full of water every time I want to fire the laser either...

Thus, in the short term at least, I'll be flowing water through it to the drain.

Adam

[DMills]

Back when I90's and the like were the staple of the UK scene, the common thing to do was to get an air conditioning condenser or two, pull the compressors and run the water through the condenser coils directly.

A two fan unit about 5 feet tall was sufficient to keep an I90 happy all night.
The trick was to use two pumps (One circulating the water around the laser and power supply, and the second circulating water through the cooling coils), as the coil pipe diameter tends to be a bit small to take the laser flow with reasonable pressure drop.

The general feeling at least in the circles I moved in was that for a 90 using a chiller was usually overkill and actually tended to reduce system reliability, obviously the UK weather helps here.

Reservoir size is fairly unimportant as even with 50 gallons it will reach steady state in fairly short order.

Regards Dan.

[mixedgas]

On a similar sized lexel with 50 gallons of water, on a sunny ohio day, you got 40 minutes to book specification inlet overtemp from room temp at 35 amps. Where the passbank would start fatal thermal runaway I suppose would be 80 minutes. If the thermal switch on the passbank would actually go off, I dont know. never got one that hot. I will tell you this, in a lab enviornment, once you go water to water, you never wanter go back. Stability went up a order of magnitude.

That data was calculated for a one off rooftop show and a US standard 55 gallon drum.


Steve

[Laserman532]

On a similar sized lexel with 50 gallons of water, on a sunny ohio day, you got 40 minutes to book specification inlet overtemp from room temp at 35 amps. Where the passbank would start fatal thermal runaway I suppose would be 80 minutes. If the thermal switch on the passbank would actually go off, I dont know. never got one that hot. I will tell you this, in a lab enviornment, once you go water to water, you never wanter go back. Stability went up a order of magnitude.

That data was calculated for a one off rooftop show and a US standard 55 gallon drum.


Steve

Lab environment - water to water heat exchanger, heat exchanger is water to cooling tower on a tank fill valve floater.

Lasershow environment- IN EVERY CIRCUMSTANCE...hook up to facility and let them pay the water bill. If the facility cant accommodate bring DPSS.

Home environment
a- hook up to source and drain and pay the water bill. I watered my lawn with output and moved the sprinkler a lot...Greenest lawn in the neighborhood.
b- hook up to your neighbors source and drain in the middle of the night and let them pay the water bill
c- If you have to, 6kw chiller, 4kw 4-12" fans on dual 2.2KW heat exchangers in parallel. In a cool environments you can run for hours
In hot environments you can run for "less than hours"

Water is cheap...equipment is heavy and expensive. It is all about ROI. IMVHO

[flecom]

b- hook up to your neighbors source and drain in the middle of the night and let them pay the water bill

LOL15 characters

[king4quarter]

I'm checking this thread cuz of some interesting info from Mr.MixedGas

In South Africa we have roadside meters that click away as water is being used.Simply get a water-pump Pliers and turn it around and let it fill up your swimming pool overnight then before sunrise just flip them back around again.I'm not sure if that's the same in the USA lol but it works like a bomb

[andy_con]

havent we been here before?

http://www.photonlexicon.com/forums/...ad.php?t=11502

[king4quarter]

I'm not sure..have we?
anyways see you shortly Andy...

[buffo]

havent we been here before?

Did you even bother to check the date on the first post in this thread? Because if you had, you'd see that THIS thread was the one that was here before, and the one you started in June (and which you linked to above) is actually the duplicate.

Sigh... Just because someone resurrects a thread from the grave doesn't mean you need to stomp on them Andy.

Adam

[andy_con]

Did you even bother to check the date on the first post in this thread? Because if you had, you'd see that THIS thread was the one that was here before, and the one you started in June (and which you linked to above) is actually the duplicate.

Sigh... Just because someone resurrects a thread from the grave doesn't mean you need to stomp on them Andy.

Adam

no stomping involved, sorry if it came across like that.

i was just saying thats all

[king4quarter]

Andy it's cool no worries.....but interesting info on this thread anyways