Method and apparatus for thermally protecting and/or transporting temperature sensitive products
Embodiments of the subject invention relate to a method and apparatus for thermally protecting a product, such as when storing and/or shipping a product, so as to control the temperatures the products are exposed to. Embodiments can increased the amount of time the product and/or portions of the product experience a desired temperature range and/or reduce the amount of time the product and/or portions of the product experience temperatures outside of the desired temperature range and/or experience an undesirable temperature range. Embodiments can incorporate thermally conductive materials, such as aluminum sheets, positioned around and/or near the product positioned inside a packaging container, such that the conductive materials conduct heat from one or more locations in the interior of the package to one or more other locations in the interior of the package. These thermally conductive materials can be referred to as conductive equalizers. The conductive equalizers can conductively transfer heat from the hotter portions of the interior of the container to cooler portions of the interior of the container and/or from portions of the interior desired to be cooled to the cold bank. Conducting heat from hotter portions to cooler portions, or from portions to be cooled to the cold bank can result in a more uniform temperature distribution around the product.
1. An apparatus for thermally protecting a load, comprising:
a container,
wherein the container is configured to position a load within an interior of the container;
a thermal bank; and
a conductive equalizer,
wherein the conductive equalizer is configured to be positioned within the container,
wherein at least a portion of the conductive equalizer has a thermal conductivity of at least 10 W/mK;
wherein the conductive equalizer is configured to be in direct thermal contact with the thermal bank, such that the thermal bank absorbs heat from the conductive equalizer when the conductive equalizer is at a higher temperature than the thermal bank, and provides heat to the conductive equalizer when the conductive equalizer is at a lower temperature than the thermal bank,
wherein the conductive equalizer comprises a sheet of material having a thermal conductivity, TC,
wherein the sheet of material has a length, L, from a proximal end of the sheet directly thermally conductively connected to the thermal bank to a distal end of the sheet, a thickness T, and a width w,
wherein L is in the range 0.05 m and 2 m,
wherein T is greater than or equal to 0.000001 m,
wherein T/L is in the range 0.0002 and 0.000005, and
wherein the sheet has an effective thermal conductance from the distal end to the proximal end equal to TC×w×T/L, and
wherein the apparatus is configured such that when the load is positioned within the interior of the container, the conductive equalizer is positioned within the container, the conductive equalizer is in direct thermal contact with the thermal bank, and the conductive equalizer is positioned proximate the load such that the conductive equalizer surrounds at least 70% of the load, a period of time the load is maintained in a desired temperature range is extended.
2. The apparatus according to claim 1 ,
wherein the conductive equalizer comprises one or more materials that conduct heat to move from a first position in the interior of the container that has a first temperature to a second position in the interior of the container that has a second temperature, and
wherein the first temperature is lower than the second temperature.
3. The apparatus according to claim 1 ,
wherein the conductive equalizer extends the period of time the load is maintained in the desired temperature range by conducting heat from the location the conductive equalizer is positioned within the container to the thermal bank.
4. The apparatus according to claim 1 ,
wherein the conductive equalizer is configured to completely surround the load.
5. The apparatus according to claim 1 ,
wherein the conductive equalizer extends the period of time the load is maintained in the desired temperature range by conducting heat from the thermal bank toward the location the conductive equalizer is positioned.
6. The apparatus according to claim 1 ,
wherein the conductive equalizer is flexible.
7. The apparatus according to claim 1 ,
wherein the conductive equalizer is semi-rigid.
8. The apparatus according to claim 1 ,
wherein the conductive equalizer is rigid.
9. The apparatus according to claim 1 ,
wherein T is greater than or equal to 0.01 mm.
10. The apparatus according to claim 1 ,
wherein the conductive equalizer comprises an insulation material on one or both surfaces of the conductive equalizer.
11. The apparatus according to claim 1 ,
wherein the conductive equalizer comprises a plurality of thermal conductive materials.
12. The apparatus according to claim 1 ,
wherein the conductive equalizer is configured to be positioned on one side of the load.
13. The apparatus according to claim 1 ,
wherein the conductive equalizer is configured to be positioned on all sides of the load.
14. The apparatus according to claim 1 ,
wherein the container incorporates insulation to insulate the interior of the container from an exterior of the container.
15. The apparatus according to claim 1 , further comprising:
a second thermal bank,
wherein the thermal bank is positioned below the load and the second thermal is positioned above the load, or the thermal bank is positioned above the load and the second thermal is positioned below the load.
16. The apparatus according to claim 1 ,
wherein the sheet is made out of Aluminum.
17. The apparatus according to claim 1 ,
wherein T is greater than or equal to 0.032 mm.
18. The apparatus according to claim 1 ,
wherein the conductive equalizer is separate from the container.
19. The apparatus according to claim 1 ,
wherein the conductive equalizer is configured to position the thermal bank within the conductive equalizer.
20. The apparatus according to claim 1 ,
wherein the desired temperature range is 2-8 degrees C.
21. A method of thermally protecting a load, comprising:
positioning a load within an interior of a container; and
positioning a conductive equalizer proximate to at least a portion of the load such that the conductive equalizer surrounds at least 70% of the load,
wherein at least a portion of the conductive equalizer has a thermal conductivity of at least 10 W/mK,
wherein the conductive equalizer comprises a sheet of material having a thermal conductivity, TC,
wherein positioning the conductive equalizer proximate the at least a portion of the load comprises positioning the conductive equalizer inside the container,
wherein the conductive equalizer is in direct thermal contact with a thermal bank,
wherein the thermal bank is positioned within the interior of the container,
wherein the thermal bank absorbs heat from the conductive equalizer when the conductive equalizer is at a higher temperature than the thermal bank, and provides heat to the conductive equalizer when the conductive equalizer is at a lower temperature than the thermal bank,
wherein the sheet of material has a length, L, from a proximal end of the sheet in direct thermal contact with the thermal bank to a distal end of the sheet, a thickness T, and a width w, wherein L is in the range 0.05 m and 2 m,
wherein T is greater than or equal to 0.000001 m,
wherein T/L is in the range 0.0002 and 0.000005,
wherein the sheet has an effective thermal conductance from the distal end to the proximal end equal to TC×w×T/L,
wherein the effective thermal conductance is at least 0.003 W/K, where W is watts and K is degrees Kelvin, and
wherein the conductive equalizer extends a period of time the load is maintained in a desired temperature range.
22. The method according to claim 21 ,
wherein the conductive equalizer conducts heat from a first position in an interior of the container that has a first temperature to a second position in the interior of the container that has a second temperature, and
wherein the first temperature is lower than the second temperature.
23. The method according to claim 21 ,
wherein the conductive equalizer extends the period of time the load is maintained in the desired temperature range by conducting heat from a location the conductive equalizer is positioned within the container to the thermal bank.
24. The method according to claim 21 ,
wherein conductive equalizer completely surrounds the load.
25. The method according to claim 21 ,
wherein the conductive equalizer extends the period of time the load is maintained in the desired temperature range by conducting heat from the thermal bank toward the location the conductive equalizer is positioned.
26. The method according to claim 21 ,
wherein the conductive equalizer is flexible.
27. The method according to claim 21 ,
wherein the conductive equalizer is semi-rigid.
28. The method according to claim 21 ,
wherein the conductive equalizer is rigid.
29. The method according to claim 21 ,
wherein T is greater than or equal to 0.01 mm.
30. The method according to claim 21 ,
wherein the conductive equalizer comprises an insulation material on one or both surfaces of the conductive equalizer.
31. The method according to claim 21 ,
wherein the conductive equalizer comprises a plurality of thermal conductive materials.
32. The method according to claim 21 ,
wherein positioning the conductive equalizer around at least a portion of the load comprises positioning the conductive equalizer on one side of the load.
33. The method according to claim 21 ,
wherein positioning the conductive equalizer around at least a portion of the load comprises positioning the conductive equalizer on all sides of the load.
34. The method according to claim 21 ,
wherein the container incorporates insulation to insulate the interior of the container from an exterior of the container.
35. The method according to claim 21 ,
wherein the conductive equalizer is in direct thermal contact with a second thermal bank,
wherein the thermal bank is positioned below the load and the second thermal is positioned above the load, or the thermal bank is positioned above the load and the second thermal is positioned below the load.
36. The method according to claim 21 ,
wherein the sheet is made out of Aluminum.
37. The method according to claim 21 ,
wherein T is greater than or equal to 0.032 mm.
38. The method according to claim 21 ,
wherein the conductive equalizer is separate from the container.
39. The method according to claim 21 ,
wherein the thermal bank is positioned within the conductive equalizer.
40. The method according to claim 21 ,
wherein the desired temperature range is 2-8 degrees C.