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Does anyone know of any sites where I can find out about Noise Criteria (NC - ##). I have a list of specific noise criteria for spaces, but I'm not sure how that equates to equipment & ductwork transmitting sound (if the equipment/ducting meet the criteria).

Is there a big industry sector for Refrigeration or Cryogenics with respect to fuel transportation. I remember a class I took in college where we discussed cascading refrigeration cycles to cool gases and get them into liquid form in order to transport them more readily. I just thought this was...

I'm sorry if my questions seem vague. What I am trying to get at is: Can condensation of air be controlled using a radiant floor cooling system (if you have to go below dew point to cool an occupied space to a comfortable temp [72-75]F) with the introduction of some sort of condensing unit, and...

I was curious to see if anyone has encountered the problem of developing a underfloor heating/cooling system for a building or home and dealing with vapor condensation of out door air within the cooling space.