looking for info on chillers for mri scanners, may have job with mfg. have exp. with everything from 1/4hp to racks but never worked on mri chillers/any info thanks.
mri chillers
firewod
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definitely the Quote of the week!!!!!!!!!!
I kinda dig the Big-Brother one haha
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I dunno, my nads got rads for years, and I still had a couple kids afterwards...
I work in the field of test and balance of HVAC systems and have a few questions pertaining to MRI plumbing systems. In my testing, I am task with providing process chilled water to the MRI equipment and wanted to know where the water goes once it enters the MRI machine.
1. What parts of the MRI does this process chilled water serve?
2. What temperature is expected from the process chilled water?
3. Are/Is there internal bypass control devices in the process chilled water piping for low demand operation?
4. How long can an MRI's process chilled water be turned off before it becomes a critical issue?
5. Is city water Ok to use as a backup in the event the tempered process water goes down?
6. How long can the MRI operate on city water before it becomes a critical issue?
7. Does city water need to be filtered and treated prior to entering the MRI machine?
thanks,
clacy
1. What parts of the MRI does this process chilled water serve?
2. What temperature is expected from the process chilled water?
3. Are/Is there internal bypass control devices in the process chilled water piping for low demand operation?
4. How long can an MRI's process chilled water be turned off before it becomes a critical issue?
5. Is city water Ok to use as a backup in the event the tempered process water goes down?
6. How long can the MRI operate on city water before it becomes a critical issue?
7. Does city water need to be filtered and treated prior to entering the MRI machine?
thanks,
clacy
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In the systems I've worked with, the chilled water provided to the MRI equipment is essentially condensing water for the cryo chiller that keeps the superconductor's helium shield cool. Typically, the water simply flows at a fixed rate through the condenser, and the cryo chiller will cycle as needed to maintain helium temp.
As far as water quality requirements, you'd have to direct that to the manufacturer (GE, or whomever).
1. What brand of magnet and what heat exchanger configuration do you have?
2. Temperature is specified by manufacture, GE and Siemens is 46F, Philips is 50F.
3. According to the heat exchange they have.
4. Most will shut down the gradient coil and amps, then alarm when flow from chiller stops, cold head compressor for helium gas will overheat and shut down.
5. City water will only keep the cold head compressor running.
6. It will not scan on city water.
Everything I posted is just to give a general ideal, to may variables in you questions.
Correct with the He as a refrigerant.
These systems have a permanent magnet that generates tremendous heat & this is what the He is trying to strip.
Keeping a head temp of inbetween 3-4K is what some manufactures will want. Systems also have a quench button that drops the entire He charge which could be 1millon dollars if any thing gets stuck in the magnet ,,, this of course renders the magnet useless & the machine.
Have a look at YouTube for some quench videos.
https://m.youtube.com/watch?v=6BBx8BwLhqg
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