Thermal storage and transport
The carrying case for storing and transporting heated articles includes a thermal storage assembly having a heat retention member for absorbing and retaining sensible heat and for releasing the sensible heat of a extended period time. The thermal storage assembly includes a heating coil assembly secured to a surface of the heat retention member. The heating coil assembly includes a resistive heating coil disposed adjacent to the heat retention member. The heating coil has a power cord connected to the coil with the coil being retained within a sealed thermally conductive pouch.
1. A phase change thermal storage assembly, comprising:
a container assembly having first and second sides and an internal volume between the first and second sides;
a layer of phase change material in said internal volume, said phase change material being chargeable with heat energy; and
a heater assembly positioned on one side of the layer of phase change material to charge the phase change material in the internal volume with heat energy and distribute heat evenly to the phase change material in the internal volume during charging of the phase change material, wherein the heater assembly comprises a heating element, and the heating element comprises an electrically resistive heating coil.
2. A phase change thermal storage assembly according to claim 1 , wherein the heater assembly includes a heat transfer element to distribute heat from the heating element to the phase change material during charging of the phase change material.
3. A phase change thermal storage assembly according to claim 2 , wherein the heat transfer element is disposed between the heating element and said layer of phase change material.
4. A phase change thermal storage assembly according to claim 3 , wherein the heat transfer element is thermally conductive metal foil.
5. A phase change thermal storage assembly according to claim 1 , further comprising a supporting element for the layer of phase change material.
6. A phase change thermal storage assembly according to claim 5 , wherein the supporting element is an open cell foam.
7. A phase change thermal storage assembly according to claim 1 , wherein the heating element includes a thermostat.
8. A phase change thermal storage assembly according to claim 1 , wherein the heater assembly has a heat transfer element to charge the phase change material in the internal volume with heat energy and distribute heat evenly to the phase change material in the internal volume during charging of the phase change material.
9. A food heating device, comprising a pouch and a phase change thermal storage assembly removably positioned in the pouch, said phase change thermal storage assembly, comprising:
a container assembly having first and second sides and an internal volume between the first and second sides;
a layer of phase change material in said internal volume, said phase change material being chargeable with heat energy; and
a heater assembly positioned on one side of the layer of phase change material to charge the phase change material in the internal volume with heat energy and distribute heat evenly to the phase change material in the internal volume during charging of the phase change material.
10. A food heating device according to claim 9 , wherein the heater assembly includes a heating element to charge the phase change material with heat energy and a heat transfer element to distribute heat from the heating element to the phase change material during charging of the phase change material.
11. A food heating device according to claim 10 , wherein the heat transfer element is disposed between the heating element and said layer of phase change material.
12. A food heating device according to claim 11 , wherein the heat transfer element is a thermally conductive metal foil.
13. A food heating device according to claim 9 , further comprising a supporting element for the layer of phase change material.
14. A food heating device according to claim 13 , wherein the supporting element is an open cell foam.
15. A food heating device according to claim 9 , wherein the heater assembly is a heating element.
16. A food heating device according to claim 15 , wherein the heating element is an electrically resistive heating coil.
17. A food heating device according to claim 15 , wherein the heating element includes a thermostat.
18. A food heating device according to claim 9 , wherein the heater assembly has a heat transfer element to charge the phase change material in the internal volume with heat energy and distribute heat evenly to the phase change material in the internal volume during charging of the phase change material.
19. A pizza heater for keeping pizza warm during delivery, comprising:
a container assembly having first and second sides and an internal volume between the first and second sides;
a layer of phase change material in said internal volume, said phase change material being chargeable with heat energy; and
a heater assembly positioned on one side of the layer of phase change material to charge the phase change material in the internal volume with heat energy and distribute heat evenly to the phase change material in the internal volume during charging of the phase change material, wherein the heater assembly comprises a heating element, and the heating element comprises an electrically resistive heating coil.
20. A pizza heater according to claim 19 , wherein the heater assembly includes the heating element to charge the phase change material with heat energy and first and second heat transfer elements on opposite sides of said heating element, one of said heat transfer elements distributing heat from the heating element to the phase change material during charging of the phase change material.
21. A pizza heater according to claim 20 , wherein one of the heat transfer element is disposed between the heating element and said layer of phase change material.
22. A pizza heater according to claim 21 , wherein the heat transfer elements are thermally conductive metal foils.
23. A pizza heater according to claim 19 , further comprising a supporting element for the layer of phase change material.
24. A pizza heater according to claim 23 , wherein the supporting element is an open cell foam.
25. A pizza heater according to claim 19 , wherein the heating element includes a thermostat.
26. A pizza heater according to claim 19 , wherein the heater assembly has the heat transfer element to charge the phase change material in the internal volume with heat energy and distribute heat evenly to the phase change material in the internal volume during charging of the phase change material.
27. A pizza heater according to claim 19 , further comprising a rigid base having a greater surface area than the resistive heating coil, the container and the resistive heating coil being secured to the base with the resistive heating coil between the base and the container so as to define an uncovered portion of the base, and a thermally conductive material extending over the uncovered portion.