Abstract:
The present disclosure relates to apparatuses and methods for multi-phase vacuum-assisted recovery of refrigerant from a vehicle. One apparatus for multi-phase vacuum-assisted recovery of refrigerant from a vehicle includes a compressor that removes refrigerant from the vehicle during a first phase and a second phase of a recovery process. The apparatus also includes one or more pressure sensitive devices that are each configured to measure a first pressure and/or a second pressure in the apparatus. Upon the first pressure being less than a first threshold pressure, a vacuum pump that is fluidly connected in series with the compressor assists the compressor in the removal of refrigerant from the vehicle during a second stage of the recovery process. Also, upon the second pressure being less than a second threshold pressure, the vacuum pump ceases assisting the compressor.
Abstract:
An oil lubricated helium compressor system is located in an indoor environment where the ambient air temperature is between 15°C and 30°C. The system includes a compressor, a separator internal or external to the compressor that receives a mixture of compressed helium and oil and discharges helium and oil through separate ports, a water cooled after-cooler for effecting cooling of the helium and oil, an air cooled after-cooler for effecting cooling of the helium and oil, the air cooled after-cooler including a heat exchanger and a fan, the both coolers are connected in series, a first line extending from the helium discharge port and passing through the water cooled after-cooler and the air cooled after-cooler the helium being cooled by one or both the water cooled after-cooler and the air cooled after-cooler; and a second line extending from the oil discharge port through both coolers.
Abstract:
A vapor compression system (20) comprises: a compressor (24) having a suction port (26) and a discharge port (28); a refrigerant flowpath (33) from the discharge port and returning to the suction port; a first heat exchanger (30) along the refrigerant flowpath; a second heat exchanger (50) along the refrigerant flowpath; and a vaporizer system (22; 300). The vaporizer system comprises: a first vaporizer (68A; 368A) and a second vaporizer (68B: 368B) each comprising: a vessel (86; 386) having an inlet (84), a vapor outlet (124), and a liquid outlet (130); and a gas bypass flowpath (160) in heat transfer relation with an interior of the vessel.
Abstract:
A method and system for purifying contaminated refrigerants is described. The refrigerant is heated in a controlled manner to separate it into fractions, one fraction comprising the pure refrigerant and the remaining fractions comprising the contaminants. The temperature of the refrigerant fraction output being closely monitored and controlled to ensure that it is the correct required fraction.