A refrigeration unit system is disclosed. The system can comprise a system housing having a front panel, a back panel, two side panels, a bottom panel, a bezel having an air exhaust. The system can further comprise a plurality of air intake slots and a carrying handle above the air exhaust. The system can further comprise an assembly having a cold chamber central to the assembly. The assembly can comprise a thermoelectric module affixed to the chamber in direct contact. The thermoelectric module can be configured for conduction of a heat away from the cold chamber. The cold chamber can comprise a shelf removable from the cold chamber.

A refrigeration unit system is disclosed. The system can comprise a system housing having a front panel, a back panel, two side panels, a bottom panel, a bezel having an air exhaust. The system can further comprise a plurality of air intake slots and a carrying handle above the air exhaust. The system can further comprise an assembly having a cold chamber central to the assembly. The assembly can comprise a thermoelectric module affixed to the chamber in direct contact. The thermoelectric module can be configured for conduction of a heat away from the cold chamber. The cold chamber can comprise a shelf removable from the cold chamber.

An indoor unit of a refrigeration apparatus, to be disposed in a ceiling, includes a casing that has blow-out ports and a blow-in port disposed in a lower surface, a plate-shaped member disposed below the blow-in port, and a filter disposed above an opening in the plate-shaped member. The casing accommodates a heat exchanger, a control board, a support member supporting the control board, and a gas sensor disposed at or adjacent to the support member and between the casing and the plate-shaped member. The gas sensor detects the refrigerant flowing out of the blow-in port due to refrigerant leakage, and the gas sensor is removable when the plate-shaped member is shifted.

A control method and a control system are provided. A valve closing position of a valve device can be controlled according to the current flow direction or working mode of a refrigerant. A stroke of the valve device from a fully-opened position to a fully-closed position is defined as a total valve closing stroke. When the flow direction of the refrigerant is a forward direction, the valve device is controlled to operate at a first valve closing position, and when the flow direction of the refrigerant is a reverse direction, the valve device is controlled to operate at a second valve closing position. The first valve closing position is different from the second valve closing position, such that wear caused by valve closing can be reduced.

Thermal management systems include an open circuit refrigeration system featuring a first receiver configured to store a gas, a second receiver configured to store a liquid refrigerant fluid, an evaporator configured to extract heat from a heat load that contacts the evaporator, and an exhaust line, where the first receiver, the second receiver, the evaporator, and the exhaust line are connected to provide a refrigerant fluid flow path.

A refrigerant recovery management system includes a display and a computer. The computer executes a data input program to present a screen on the display. The screen is configured for a user to input information regarding refrigerant that has been recovered from refrigerant use equipment and is to be sent to a refrigerant treatment practitioner that conducts a refrigerant treatment on the refrigerant. The computer is configured to: generate request data for sending the refrigerant to the refrigerant treatment practitioner, the request data including information regarding the refrigerant; generate report data regarding the refrigerant treatment for reporting the refrigerant treatment to a manager that manages refrigerant recovery, the report data including information regarding the refrigerant; and determine a conformity between the request data and the report data by determining whether information regarding the refrigerant included in the request data agrees with information regarding the refrigerant included in the report data.

An HVAC system with a refrigerant gas sensor is provided. In one embodiment, an HVAC system includes a heat exchanger coil installed within a housing. The heat exchanger coil is operable to exchange heat with air in the housing via a refrigerant passing through the heat exchanger coil. The system also includes an HVAC sensor assembly having a refrigerant gas sensor and a processor installed in a sensor housing. The processor is configured to execute stored instructions to identify an undesirable condition pertaining to the refrigerant gas sensor. The HVAC system may also include a controller to prevent an operation of the HVAC system in response to identification of the undesirable condition pertaining to the refrigerant gas sensor. Additional systems, devices, and methods are also disclosed.

The present disclosure relates to a heating, ventilation, and air conditioning (“HVAC”) system include a supply damper, a return damper, and a defrost damper which are operable to control a supply airflow, a return airflow, and a defrost airflow to flow between a supply duct, a return duct, and an indoor heat exchanger without substantially flowing into and substantially cooling an indoor space. A reheat coil may also warm the supply air flow and a defrost return line may be used to bypass a bi-flow expansion device and an indoor heat exchanger.

A refrigerated transport system comprises a body enclosing a refrigerated compartment. A refrigeration system (29) comprises first and second vapor compression loops each having: a refrigerant charge; a compressor (36A,B) for driving the refrigerant of the refrigerant charge; a first heat exchanger (38A,B) positioned to reject heat to an external environment in a cooling mode; and a second heat exchanger (42A,B) positioned to absorb heat from the refrigerated compartment in the cooling mode.

A cryocooler includes a motion conversion mechanism that converts rotating motion output by a motor into linear reciprocating motion of a displacer and includes a first component and a second component slidably connected to each other, a measuring instrument that is connected to the motor to output time-series data indicating power consumption of the motor or a current flowing through the motor, and a processing unit that detects abrasion of a sliding surface between a first component and a second component of the motion conversion mechanism on the basis of section data including an intake start timing or an exhaust start timing in the time-series data.