Surged vapor compression heat transfer systems with reduced defrost phase separator
Surged vapor compression heat transfer systems, devices, and methods are disclosed having refrigerant phase separators that generate at least one surge of vapor phase refrigerant into the inlet of an evaporator after the initial cool-down of an on cycle of the compressor. This surge of vapor phase refrigerant, having a higher temperature than the liquid phase refrigerant, increases the temperature of the evaporator inlet, thus reducing frost build up in relation to conventional refrigeration systems lacking a surged input of vapor phase refrigerant to the evaporator.
1. A vapor surge phase separator, comprising:
a body portion defining a separator inlet, a separator outlet, and a separator
refrigerant storage chamber,
where the separator refrigerant storage chamber provides fluid communication between the separator inlet and the separator outlet,
where the separator inlet and the separator outlet are between about 40 degrees and about 110 degrees apart,
where the separator refrigerant storage chamber has a longitudinal dimension,
where a ratio of a diameter of the separator inlet to a diameter of the separator outlet is about 1:1.4 to 4.3, and
where a ratio of the diameter of the separator inlet to the longitudinal dimension is about 1:7 to 13.
2. The phase separator of claim 1 , where a ratio of a diameter of the separator inlet to a diameter of the separator outlet is about 1:1.4 to 2.1.
3. The phase separator of claim 1 , where the longitudinal dimension is from about 4 to about 5.5 times a diameter of the separator outlet, and where the longitudinal dimension is from about 6 to about 8.5 times the diameter of the separator inlet.
4. The phase separator of claim 1 , where the separator refrigerant storage chamber has a volume from about 49 cm 3 to about 58 cm 3 .
5. The phase separator of claim 1 , having means for separating at least a portion of the vapor from the liquid of an expanded refrigerant.
6. The phase separator of claim 1 , having means for intermittently retaining the liquid refrigerant during a cooling cycle.
7. The phase separator of claim 1 , having means for providing at least one vapor surge to an initial portion of an evaporator.
8. The phase separator of claim 1 , where the separator outlet is in fluid communication with an initial portion of an evaporator.
9. The phase separator of claim 1 , where the separator inlet is in fluid communication with a metering device.
10. The phase separator of claim 1 , where the phase separator is integrated with a metering device.
11. The phase separator of claim 1 , where a ratio of the diameter of the separator inlet to a refrigerant mass flow rate through the phase separator during a cooling cycle is about 1:1 to 12.
12. The phase separator of claim 8 , where the initial portion of the evaporator is in fluid communication with an evaporator outlet and the evaporator outlet is in fluid communication with a compressor.
13. The phase separator of claim 9 , where the metering device is in fluid communication with a condenser and the condenser is in fluid communication with a compressor.