Abstract: Temperature controlled cargo containers may include thermal masses conditioned to temperatures above and/or below a target temperature. Example thermal masses may include plates including phase change materials, such as eutectic materials. One or more fans and flapper valves may be selectively operated to circulate air in the cargo container across one or more of the thermal masses to maintain the temperature within the cargo container within a prescribed temperature band. Some example temperature controlled cargo containers may include refrigeration units and/or heaters for regenerating the thermal masses when receiving power from an external power source and/or may include one or more rechargeable batteries for providing power during transport or storage independent of external power sources.

Abstract: Temperature controlled cargo containers may include thermal masses conditioned to temperatures above and/or below a target temperature. Example thermal masses may include plates including phase change materials, such as eutectic materials. One or more fans and flapper valves may be selectively operated to circulate air in the cargo container across one or more of the thermal masses to maintain the temperature within the cargo container within a prescribed temperature band. Some example temperature controlled cargo containers may include refrigeration units and/or heaters for regenerating the thermal masses when receiving power from an external power source and/or may include one or more rechargeable batteries for providing power during transport or storage independent of external power sources.

Abstract: A vacuum relief assembly for relieving the vacuum created in a freezer chamber of an ultra low temperature freezer. The assembly comprises tubing having an inlet port open to the external environment and an exit port open to the freezer chamber, the inlet and exit ports in fluid communication with each other. A valve is coupled to the tubing that either permits or prevents fluid flow between the external environment and the freezer chamber. A heating element contacts the tubing and is operable to apply heat thereto so as to prevent the tubing from becoming occluded with condensation. The vacuum relief assembly may further include an activation switch for energizing the heating element and a timing circuit for turning the heating element off after a predetermined period of time.