R40, NH3,HC's and all that jazz
Hi Guys,
NH3 is a great refrigerant and I believe that it only lost favour because of it's abverse properties, (flamability and health problems). It was used extensively on large plant in the 20's and 30's, i.e. ice making plant, swimming pools etc, but with the technology we have in this day and age, it should not be too much trouble to have leak detection sensors fitted in machine rooms to safeguard personell. Mind you, saying that, when I worked for British Aerospace, (Vickers Armstrong in those days), we had a stratosphere chamber that was cooled by an ammonia plant and you could smell the gas from a long way away. It seems that the old open compressor shaft seals always seemed to leak. A Canadian friend of mine was telling me that there were quite a lot of residential absorbsion units in use now-a-days in the States.
As for HC's, Calor are still trying to push their products and I suppose if good refrigeration practice was followed, it would be one way to go in certain applications. After all they have been using HC's in domestic fridges for the last 20 years in eastern Europe.
Calor also say, on their web site, that Care 30 can be used in automotive applications.....anybody know an car airconditioning unit running on HC's ???? if so it might be interesting to hear from our cousins from across the pool with their opinions on the subject, (as my old Jag's A/C is in dire straights, very low on R12 and I am not convinced that R134a is the way to go in relacing it)
Regards "the old codger"