Brewery Department Manager. Tags: None. Chicago Brew Supply. I'm not a HVAC person but I do have an air cooled chiller water not glycol for my plastics processing company. In talking with the servicemen over the years, they seem to think that hermetically sealed is better when placed in a proper designed unit.
The reason being is that there's less chance of freon leaking out since the moving parts of the compressor are contained within the refrigeration system. The "properly designed" statement that I mentioned is in reference to how the compressor is used, in particular, how it cycles on and off.
Compressor wear and tear stems from the cycling on and off to cool and stop cooling. In my chiller, instead of the compressor only being able to cycle on and off to control temperature it is equipped with a ' hot gas bypass ' valve. Yes, it is wear and tear item the bypass valve but it's cheaper to replace that then the compressor. I don't think I've seen glycol chillers with this bypass vale feature. Again, this is what I've learned over the years from the servicemen who work on my chiller.
By the way, my chiller was made in and it still has the original Copeland compressor. Chicago Brewing Supply bmason chicago-brew. Comment Post Cancel. Although the hermetic compressors are not serviceable and thus less expensive to produce, I think Bmason hit the nail on the head and agree that the key is having the proper compressor that is designed for the duty and application, whether it is a hermetic or semi-hermetic.
We've found a mix of using both styles, with the hermetics on systems in the HP range and semi-hermetic on systems 10 HP and larger. Category: home and garden indoor environmental quality. The hermetic scroll is a horizontal model with displacement of 2.
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In general, one can say that hermetic compressors are less expensive than semi-hermetic ones — considering that the equipment in which they are used in is also simpler and less expensive.
This is a factor that can, at first, call the attention of those who compare prices. However, it should be noted that these are very different products: it would be like comparing the cost of a car to that of a tractor. There are three classifications of compressors, according to this criterion: Hermetic: when the electric motor is together with the compressor in the same sealed chamber housing ; Semi-hermetic: when the motor is together with the compressor, in the same chamber, but this chamber can be opened, being fastened by screws and using seals; Open: when the electric motor is not together with the compressor.
Leaks One of the great advantages of the hermetic compressor is the extremely low incidence of refrigerant leakage. Lubrication In hermetic compressors, lubrication occurs by centrifugal force, which causes the oil to circulate.
Application Hermetic compressors are used in domestic refrigeration systems and compact commercial refrigeration and air conditioning systems. Cost In general, one can say that hermetic compressors are less expensive than semi-hermetic ones — considering that the equipment in which they are used in is also simpler and less expensive.
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