Portable regulated temperature container with phase change materials
A portable, independent thermoelectric temperature regulated system for providing active cooling to one or more payloads. The system includes a thermally insulated housing, a phase change material, one or more thermoelectric converters embedded in the thermally insulated housing, and a power source. The system includes a control circuit for managing temperature of the payload(s) based on user selections. The phase change material may be charged and discharged to provide passive cooling or heating when the thermoelectric converter is not active.
1 . A method of using a phase change material in portable temperature control system, the system comprising:
a thermally insulated housing with air circulation openings and a raised guard maintaining spacing for the openings to maintain air circulation;
a payload container;
a phase change material disposed between the thermally insulated housing and the payload container;
a thermoelectric engine, the engine comprising:
one or more thermoelectric converters, each having a hot side and a cold side;
a hot side circulation housing to circulate a first fluid between ambient and the hot side(s) of the one more thermoelectric converters;
a hot side circulation driver in fluid communication with the first fluid;
a cold side circulation housing to circulate a second fluid between the cold side(s) of the one or more thermoelectric converters and the payload container;
wherein the cold side circulation housing comprises:
a set of isolators interior to the cold side circulation housing, where the set of isolators comprises:
a first isolator disposed at an inlet to the cold side circulation housing,
a second isolator disposed at an outlet to the cold side circulation housing; and
a set of actuators in communication with the set of isolators and configured to control a flow path of the second fluid, where each of the set of isolators is associated with at least one of the set of actuators;
a cold side circulation driver in fluid communication with the second fluid;
a power source in electrical communication with the thermoelectric converters, the hot side circulation driver, the cold side circulation driver, and the set of actuators; and
a control circuit in electrical communication with the thermoelectric converters, the hot side circulation driver, the cold side circulation driver, the set of actuators, and the power source;
wherein the set of isolators is configured to have an open position and a closed position where the closed position stops all circulation of the second fluid to reduce heat leakage into the payload container; and
the method comprising the steps of:
energizing at least one of the one or more thermoelectric converters;
activating the set of actuators to move the set of isolators to their open positions; and
energizing the hot side circulation driver and the cold side circulation driver.
2 . The method of claim 1 , wherein the phase change material comprises one or more of: ice, sodium polyacrylates for sub 0 degrees C., paraffins with melting points between 0 degrees C. and 200 degrees C., waxes, natural organic oils, functionalized BioPCMs, plastic and metal-encapsulated paraffins, hydrated salts, inorganic eutectic solder SiBn, Sn—Ag—Cu, AuSn, and high temperature salts.
3 . The method of claim 1 , wherein the thermally insulated housing comprises one or more of:
an aerogel, polystyrene fibers, and a vacuum insulated panel.
4 . The method of claim 1 , wherein the hot side circulation driver and the cold side circulation driver are fans.
5 . The method of claim 1 ; further comprising:
deenergizing the hot side circulation driver and the cold side circulation driver;
deenergizing the at least one of the one or more thermoelectric converters; and
activating the set of actuators to move the set of isolators to their closed positions.
6 . A system for portable temperature control, comprising:
a thermally insulated housing with air circulation openings and a raised guard maintaining spacing for the openings to maintain air circulation;
a payload container;
a phase change material disposed between the thermally insulated housing and the payload container;
a thermoelectric engine, the engine comprising:
one or more thermoelectric converters, each having a hot side and a cold side;
a hot side circulation housing to circulate a first fluid between ambient and the hot side(s) of the one more thermoelectric converters;
a hot side circulation driver in fluid communication with the first fluid;
a cold side circulation housing to circulate a second fluid between the cold side(s) of the one or more thermoelectric converters and the payload container;
wherein the cold side circulation housing comprises:
a set of isolators interior to the cold side circulation housing, where the set of isolators comprises:
a first isolator disposed at an inlet to the cold side circulation housing,
a second isolator disposed at an outlet to the cold side circulation housing; and
a set of actuators in communication with the set of isolators and configured to control a flow path of the second fluid, where each of the set of isolators is associated with at least one of the set of actuators;
a cold side circulation driver in fluid communication with the second fluid;
a power source in electrical communication with the thermoelectric converters, the hot side circulation driver, the cold side circulation driver, and the set of actuators; and
a control circuit in electrical communication with the thermoelectric converters, the hot side circulation driver, the cold side circulation driver, the set of actuators, and the power source;
wherein the set of isolators is configured to have an open position and a closed position where the closed position stops all circulation of the second fluid to reduce heat leakage out of the thermally insulated housing.
7 . The system of claim 6 , wherein the phase change material comprises one or more of: paraffins with melting points between 100 degrees C. and 200 degrees C., waxes, natural organic oils, functionalized BioPCMs, plastic and metal-encapsulated paraffins, hydrated salts, inorganic eutectic solder SiBn, Sn—Ag—Cu, AuSn, and high temperature salts.
8 . The system of claim 6 , wherein the thermally insulated housing comprises one or more of:
an aerogel, polystyrene fibers, and a vacuum insulated panel.
9 . The system of claim 6 , wherein the hot side circulation driver and the cold side circulation driver are fans.