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[spiderman]

hi all
im a mech eng student.
im running a refrigeation system experiment using Air as refrigerant.
this is a small model scale system designed at school for producing cold Air to go into a cold room. im trying to model a blast freezing application with my model.
my model using a primary Compressor and secondary Compressor is bootstraped to the turbine.
i left the system running for about a day and came back to find icing around the turbine exit.
how can i solve this problem without switching off the system altogther?
is there any new technologies out there in the market that i can use to solve this icing problem?
what does existing vapour compression systems use to solve icing problems?

someone suggested to me to use a 'dehumidifier in conjunction with evaporative spray cooling and regenerator'.

Does anyone know what this means and how it works?

Thanks for all your help.
cheers

[Art Montemayor]

Spider:

Your description of what you are doing leaves a lot to be desired. You haven't told where you are at so your English is hard to translate in spots. The term "bootstrapped" is unknown here in the USA. I've never heard or read the term. I think you mean "coupled" or "connected". Am I right? You state you have a primary and a secondary compressor connected(?) to "the turbine". You have never previously mentioned a turbine. Don't you mean "a" turbine? This still is not enough to get a clear idea, but I'm struggling. I'm not complaining, mind you; however, it takes a lot of time and bother to try to figure out what you are trying to say.

Do you mean that you are compressing atmospheric air in 2 stages (one compressor per stage) and then expanding it through a turbo expander to produce both work and a cold air exhaust?

If that's what you mean, then I can easily see your problem. You can't compress atmospheric air (without drying it) and then expand it and not expect the water moisture content not to freeze. That is only to be expected. But I'm assuming that that is what you are doing. Please try to clarify your process and that will open the door to an easy resolution to your problem.

Await your reply.