I am working in this area for only 6 years. I work hard and learn a lot of things about industrial refrigeration. I designed several kinds of systemsX , flooded, recirculated for NH3 , R22 etc, The compressor i met including: Grasso, Howden, Mycom, Bitzer etc. Most of the equipment i met is for Chemical refrigeration. Lots of instrumentation and lots of things not necessary for common refrigeration system. Actually, I feel that there is still many things to be learnt of refrigeration. It is a long way for people to learn refrigeration but we need to get more money as soon as possible. Does any people know any field of refrigeration can get good paid?