Rechargeable thermal battery systems for use in transporting or storing perishable items
An apparatus includes a cargo area with a heat exchanger; a thermal battery system having a phase change material (PCM) with first and second heat exchangers embedded in the PCM; fluid conduits defining fluid passageways interconnecting the cargo area heat exchanger and the first PCM-embedded heat exchanger; and a pump creating a fluid flow through the fluid conduits between the cargo area heat exchanger and the first PCM-embedded heat exchanger. The apparatus also includes external ports configured for connecting to an external charging source for charging the PCM; and fluid conduits defining fluid passageways interconnecting the external ports and the second PCM-embedded heat exchanger. The first PCM-embedded heat exchanger, pump, and cargo area heat exchanger form part of a first closed-loop circuit for transferring heat between the cargo area and the thermal battery system. The second PCM-embedded heat exchanger and external ports do not part of the first closed-loop circuit.
1 . A transportation vessel having walls defining a cargo storage area for receiving and maintaining items at one or more temperatures, comprising:
(a) a storage area heat exchanger located onboard the transportation vessel in air communication with the cargo storage area of the transportation vessel;
(b) a thermal battery system comprising a thermal battery located underneath the cargo storage area and a flooring surface serving as a floor of the cargo storage area for supporting items placed in the cargo storage area, the thermal battery comprising
(i) a tank containing a phase change material (PCM),
(ii) a first heat exchangers comprising a first heat exchange circuit embedded in the PCM for discharging the PCM, and
(iii) a second heat exchanger comprising a second heat exchange circuit embedded with the first heat exchanger circuit in the PCM for charging the PCM;
(c) a first plurality of fluid conduits located onboard the transportation vessel and defining fluid passageways interconnecting in fluid communication the cargo storage area heat exchanger and the first PCM-embedded heat exchanger;
(d) a pump located onboard the transportation vessel and arranged in fluid communication with the first plurality of fluid conduits and configured to create a fluid flow through the first plurality of fluid conduits between the cargo storage area heat exchanger and the first PCM-embedded heat exchanger;
(e) a pair of external ports located exterior to the cargo storage area in a said wall of the transportation vessel and configured for connecting to an external charging source for charging the PCM of the thermal battery system; and
(f) a second plurality of fluid conduits located onboard the transportation vessel and defining fluid passageways interconnecting in fluid communication the external ports and the second PCM-embedded heat exchanger;
(g) wherein the first PCM-embedded heat exchanger, pump, storage area heat exchanger, and the first plurality of fluid conduits are part of a first closed-loop circuit located onboard the transportation vessel for transferring heat between the cargo storage area and the thermal battery system; and
(h) wherein the second PCM-embedded heat exchanger, external ports, and the second plurality of fluid conduits located onboard the transportation vessel are not part of the first closed-loop circuit.