Providing single servings of cooled foods and drinks
Systems and methods have demonstrated the capability of rapidly cooling the contents of pods containing the ingredients for food and drinks.
1. A machine for producing cooled food or drinks from ingredients in a pod containing the ingredients, the machine comprising:
an evaporator of a refrigeration system, the evaporator defining a receptacle sized to receive the pod, wherein the refrigeration system has a working fluid loop that runs from the evaporator, to a compressor, to a condenser, to an expansion device, back to the evaporator, and also includes a first bypass line that extends from the working fluid loop between the compressor and the condenser to the working fluid loop between the expansion device and the evaporator; and
a processor operable to control the refrigeration system to cool the pod after the pod is inserted in the receptacle of the evaporator and to defrost a surface of the evaporator after the cooled food or drinks are dispensed from the pod and before the pod is removed from the receptacle of the evaporator.
2. The machine of claim 1 , further comprising a bypass valve on the first bypass line.
3. The machine of claim 1 , further comprising a second bypass line that extends from the working fluid loop between the compressor and the condenser to the working fluid loop between the evaporator and the compressor.
4. The machine of claim 3 , further comprising a bypass valve on the second bypass line.
5. The machine of claim 3 , further comprising a suction line heat exchanger.
6. The machine of claim 5 , wherein the working fluid loop passes through a reservoir of phase change material disposed between the compressor and the condenser.
7. The machine of claim 6 , wherein the phase change material comprises an ethylene glycol and water mixture, salt water, paraffin wax, alkanes, or pure water or a combination thereof.
8. The machine of claim 7 , wherein the working fluid loop includes a pressure vessel between the condenser and the evaporator, a first isolation valve between the pressure vessel and the expansion valve, and a second isolation valve between the compressor and the condenser.
9. The machine of claim 8 , wherein the working fluid loop passes through a thermoelectric cooler between the condenser and the expansion valve.
10. A machine for reducing the temperature of ingredients in a pod containing the ingredients and at least one mixing paddle, the machine comprising:
an evaporator of a refrigeration system, the evaporator defining a receptacle sized to receive the pod, wherein the refrigeration system has a working fluid loop that runs from the evaporator, to a compressor, to a condenser, to an expansion device, back to the evaporator, and also includes a first bypass line that extends from the working fluid loop between the compressor and the condenser to the working fluid loop between the expansion device and the evaporator and a bypass valve on the first bypass line;
a motor operable to move the at least one mixing paddle of a pod in the receptacle; and
a processor operable:
to close the bypass valve on the first bypass line and operate the motor to rotate the at least one mixing paddle while the evaporator freezes the ingredients in the pod in the receptacle of the evaporator and the cooled food or drink from the pod is dispensed out of the pod through an aperture in the pod; and
to open the first bypass line to defrost the surface of the receptacle of the evaporator while the pod is in the receptacle of the evaporator.
11. The machine of claim 10 , wherein the working fluid loop includes a pressure vessel between the condenser and the evaporator, a first isolation valve between the pressure vessel and the expansion valve, and a second isolation valve between the compressor and the condenser.
12. The machine of claim 10 , wherein the working fluid loop passes through a thermoelectric cooler between the condenser and the expansion valve.
13. The machine of claim 10 , wherein the processor is operable to open the first bypass line to defrost the surface of the receptacle of the evaporator after the cooled food or drink from the pod is dispensed out of the pod through the aperture in the pod.
14. The machine of claim 10 , further comprising a second bypass line that extends from the working fluid loop between the compressor and the condenser to the working fluid loop between the evaporator and the compressor.
15. The machine of claim 14 , further comprising a bypass valve on the second bypass line.
16. The machine of claim 14 , further comprising a suction line heat exchanger.
17. The machine of claim 14 , wherein the working fluid loop passes through a reservoir of phase change material disposed between the compressor and the condenser.
18. The machine of claim 17 , wherein the phase change material comprises an ethylene glycol and water mixture, salt water, paraffin wax, alkanes or pure water.
19. A machine for producing cooled food or drinks from ingredients in a pod containing the ingredients, the machine comprising:
a housing; and
an evaporator of a refrigeration system, the evaporator defining a receptacle sized to receive the pod, the evaporator having a pod-to-evaporator heat transfer surface of the evaporator of less than 50 square inches, and the evaporator is constructed of material defining microchannels;
wherein the refrigeration system has a working fluid loop that runs from the evaporator, to a compressor, to a condenser, to an expansion device, and back to the evaporator; and
wherein the evaporator is made of a material that has at least 160 W/mK thermal conductivity.
20. The machine of claim 19 , further comprising an aluminum evaporator with a mass of less than 1.50 pounds.
21. The machine of claim 19 , wherein the evaporator has cooling channels in it allowing for the fluid mass velocity up to 180,000 lb/(hour feet squared).
22. The machine of claim 19 , further comprising an evaporator refrigerant wetted surface area of less than 200 square inches.
23. The machine of claim 19 , wherein the evaporator clamps down on the pod.
24. The machine of claim 19 , wherein the evaporator has an internal wall of copper adjacent to the pod.
25. The machine of claim 19 , further comprising a bypass line that extends from the working fluid loop between the compressor and the condenser to the working fluid loop between the expansion valve and the evaporator.
26. The machine of claim 19 , further comprising a rotary compressor with displacement of refrigerant of less than 6 cubic centimeters.
27. The machine of claim 19 , further comprising R-290 propane as a refrigerant.
28. The machine of claim 19 , wherein a pressure drop across the evaporator is less than 2 psi.
29. A method of reducing the temperature of ingredients in a pod containing the ingredients, the method comprising:
inserting the pod containing the ingredients into an evaporator of a refrigeration system of a machine, the refrigeration system having a working fluid loop that runs from the evaporator, to a compressor, to a condenser, to an expansion device, back to the evaporator, and also includes a first bypass line that extends from the working fluid loop between the compressor and the condenser to the working fluid loop between the expansion device and a bypass valve on the first bypass line;
operating a motor of the machine to rotate a mixing paddle inside the pod while using the evaporator to cool the pod with a bypass valve on the first bypass line closed;
operating the motor of the machine to rotate the mixing paddle inside the pod while dispensing the cooled food or drink out of the pod through an aperture in the pod; and
opening the first bypass line to defrost the surface of the receptacle of the evaporator while the pod is in the receptacle of the evaporator.
30. The method of claim 29 , opening a second valve on a second bypass line that extends from the working fluid loop between the compressor and the condenser to the working fluid loop between the evaporator and the compressor.
31. The method of claim 29 , wherein the refrigeration cycle has a suction line heat exchanger.
32. The method of claim 29 , wherein the working fluid loop includes a pressure vessel between the condenser and the evaporator, a first isolation valve between the pressure vessel and the expansion valve, and a second isolation valve between the compressor and the condenser.
33. The method of claim 29 , wherein the working fluid loop passes through a thermoelectric cooler between the condenser and the expansion valve.
34. The method of claim 29 , wherein opening the first bypass line to defrost the surface of the receptacle of the evaporator while the pod is in the receptacle of the evaporator comprises opening the first bypass line to defrost the surface of the receptacle of the evaporator after the cooled food or drink from the pod is dispensed out of the pod through the aperture in the pod.
35. The method of claim 29 , wherein the working fluid loop passes through a reservoir of phase change material disposed between the compressor and the condenser.
36. The method of claim 35 , wherein the phase change material comprises ethylene glycol and water mixture, salt water, paraffin wax, alkanes or pure water.