Mike Hopkins
13-12-2001, 04:26 AM
I had the pleasure some time back to work on a system that chilled water to cool the condenser and compressor on a helium refrigeration system. Basic layout was a Neslab water bath chiller that had a heat exchanger from the helium unit in the chilled water tank. The helium unit had a pump that circulated water through it's condenser and water jacket around the compressor.
Compressor was special breed DC winding. The compressor served the refrigeration system that cooled something in a magnetic resonance imaging machine. Not sure if it cooled the chamber or electronics associated with the MRI. I do know that the helium charge was a static charge much like what you would do with low stage on a cascade. My guess is they used helium due to possibility of a leak with a human being in the chamber.
They would maybe just talk funny for a while! But the helium line did wear a hole and lost the charge one time. Cost around 6K US
for the GE tech to come out and repair. We never fooled much with the helium unit, just the Neslab cooler. When the MRI was powered up though you had to watch your toolbag cause it would tend to be attracted to the magnetic force. Also steel toe boots make for interesting experience!
Mike Hopkins
Compressor was special breed DC winding. The compressor served the refrigeration system that cooled something in a magnetic resonance imaging machine. Not sure if it cooled the chamber or electronics associated with the MRI. I do know that the helium charge was a static charge much like what you would do with low stage on a cascade. My guess is they used helium due to possibility of a leak with a human being in the chamber.
They would maybe just talk funny for a while! But the helium line did wear a hole and lost the charge one time. Cost around 6K US
for the GE tech to come out and repair. We never fooled much with the helium unit, just the Neslab cooler. When the MRI was powered up though you had to watch your toolbag cause it would tend to be attracted to the magnetic force. Also steel toe boots make for interesting experience!
Mike Hopkins