Abstract: A method and apparatus for controlling compressors in a cascade vapor compression system. The process may include controlling the operation of a first compressor based on a constant band control, and controlling the operation of a second compressor based on a proportional band control. Controlling the first compressor based on the constant band control may include operating the compressor at a constant setting if first measurements are within a range associated with a first setpoint. It may also include proportionally adjusting the operation of the first compressor if the first measurements are outside the range. Further, controlling the second compressor based on the proportional band control may include operating the compressor based on one of a plurality of proportional bands, each proportional band having a different proportional factor. Controlling the second compressor operation may further include switching between these proportional bands based on a second measured parameter.

Abstract: An embodiment of a system for changing a temperature of a packaged biologic substance includes a chamber configured to receive the packaged biologic substance. In addition, the system includes a refrigeration assembly configured to change a temperature of the packaged biologic substance. Further, the system includes an auxiliary heat exchanger at least partially positioned in the chamber, the auxiliary heat exchanger including at least one heat pipe.

Abstract: A refrigeration module of a cold space chamber has a blower and an evaporator. A method of controlling the refrigeration module includes defrosting a coil of the evaporator to form a volume of warm air surrounding the coil. The method includes circulating a refrigerant through the evaporator after defrosting the coil, to cool the coil. The method includes operating the blower in a series of pulses to control introduction of the volume of warm air into the cold space chamber.

Abstract: A refrigeration module of a cold space chamber has a blower and an evaporator. A method of controlling the refrigeration module includes defrosting a coil of the evaporator to form a volume of warm air surrounding the coil. The method includes circulating a refrigerant through the evaporator after defrosting the coil, to cool the coil. The method includes operating the blower in a series of pulses to control introduction of the volume of warm air into the cold space chamber.

Abstract: A method and apparatus for controlling compressors in a cascade vapor compression system. The process may include controlling the operation of a first compressor based on a constant band control, and controlling the operation of a second compressor based on a proportional band control. Controlling the first compressor based on the constant band control may include operating the compressor at a constant setting if first measurements are within a range associated with a first setpoint. It may also include proportionally adjusting the operation of the first compressor if the first measurements are outside the range. Further, controlling the second compressor based on the proportional band control may include operating the compressor based on one of a plurality of proportional bands, each proportional band having a different proportional factor. Controlling the second compressor operation may further include switching between these proportional bands based on a second measured parameter.

Abstract: An embodiment of a cold storage system includes a housing further including a chamber having a front opening closeable by an outer door and a back wall opposite the front opening, one or more outlets defined in the back wall, and one or more inlets defined in the chamber more proximate the front opening than the back wall. In addition, the cold storage system includes a refrigeration module operably coupled to the chamber. The refrigeration module includes an evaporator positioned vertically higher than the chamber, a blower configured to generate an airflow that is in thermal communication with the evaporator, and ducting configured to circulate the airflow between the chamber and the evaporator via the inlets and the outlets such that the airflow is directed through the outlets into the chamber and then from the chamber into the inlets to cool the chamber.

Abstract: An embodiment of a system for changing a temperature of a packaged biologic substance includes a chamber configured to receive the packaged biologic substance. In addition, the system includes a refrigeration assembly configured to change a temperature of the packaged biologic substance. Further, the system includes an auxiliary heat exchanger at least partially positioned in the chamber, the auxiliary heat exchanger including at least one heat pipe.