A door assembly for a refrigeration door system with a defrosting feature. The door assembly also includes a door frame. The door frame may include a top member having a first end and a second end opposite the first end, and the top member may have a top conduit therein. The door frame may also include a first side member coupled transversely to the first end of the top member and having a first conduit therein, the first conduit being fluidly coupled to the top conduit, and a second side member coupled transversely to the second end of the top member and having a second conduit. The second conduit may be fluidly coupled to the top conduit. The door frame may further have orifices positioned along the top member, the first side member, and the second side member. The door assembly also includes a positive pressure source.

Disclosed is an automatic-cooking-and-processing vending system for frozen-food, comprising the low-temperature chamber, the object-moving system, the product shelves, the low-temperature chamber equipment, the food container; the said low-temperature chamber equipment is inside the low-temperature chamber, or connected to the casing of the low-temperature chamber; the low-temperature chamber equipment contains hot-air source and the humid-air source; the product shelves is inside the low-temperature chamber with disposable food containers placed on; the object-moving system is inside the low-temperature chamber. This system has the air-circulating system, which can force the outer hot-and-humid air to come inside in one-way from a cold chamber, so as to isolate the hot-and-humid air. Further disclosed is a food-automatic-cook-and-processing system, which may be used in the automatic-cooking-and-processing vending system, comprising a series of auto piercing food-processing devices for disposable food containers and different foods, and with the working patterns of these devices.

A refrigerator is provided that includes a low energy defrost system and method for melting frost formed on an evaporator of a cooling system for the refrigerator. The low energy defrost system includes using air from the refrigerator compartment or external air adjacent the refrigerator to be directed to the evaporator and passed adjacent the evaporator coils to melt any frost formed thereon. As the air is above freezing temperature, it will melt any frost formed on the coils without the need of use an electrical heater. Re-cooled air from the melted frost may then be directed back into the refrigerator compartment to be used to aid in cooling the refrigerator compartment or keeping the refrigerator compartment at the programmed or predetermined temperature.

A method for thawing of a transport transporting bulk material includes providing water vapor, introducing water vapor into a thawing chamber. The transport transporting bulk material and to be thawed is at least partially located in the thawing chamber. Air loaded with the water vapor and having a preset dew point temperature T.sub.T is generated in the thawing chamber, and the dew point temperature T.sub.T is adapted to the transport transporting bulk material.

A transport refrigeration unit (TRU) is provided. The TRU includes a housing defining a flow path from an intake to an outlet, a blower to drive air along the flow path from the intake to the outlet, coils disposed in the flow path between the intake and the outlet and over which the air driven by the blower flows, a defrost element to execute a defrost action with respect to the coils, sensing elements at the intake and the outlet to sense pressures of the air at the intake and the outlet and a controller. The controller is configured to control at least one of the blower and the defrost element in accordance with readings of the sensing elements.

A refrigerator includes a storage compartment; a first flow path separated from the storage compartment; an evaporator provided on the first flow path to cool air; a compressor configured to discharge a refrigerant to the evaporator; a blower fan configured to discharge air of the first flow path to the storage compartment; a defrost heater provided on the first flow path to heat the evaporator; a second flow path separated from the first flow path; a defrost fan configured to suction air of the first flow path into the second flow path; and a controller configured to alternately perform a cooling operation and a defrosting operation, configured to operate the compressor and the blower fan during the cooling operation, configured to operate the defrost heater and the defrost fan during the defrosting operation, and configured to vary a rotational speed of the defrost fan.

A transport refrigeration unit (TRU) is provided. The TRU includes a housing defining a flow path from an intake to an outlet, a blower to drive air along the flow path from the intake to the outlet, coils disposed in the flow path between the intake and the outlet and over which the air driven by the blower flows, a defrost element to execute a defrost action with respect to the coils, sensing elements at the intake and the outlet to sense pressures of the air at the intake and the outlet and a controller. The controller is configured to control at least one of the blower and the defrost element in accordance with readings of the sensing elements.

A refrigeration door system with a defrosting feature includes a housing defining a refrigerated cavity therein, and a door assembly carried by the housing and providing access to the refrigerated cavity. The door assembly includes a door frame and a sliding door coupled to the door frame, the sliding door switching between an open position providing the access to the refrigerated cavity and a closed position where the refrigerated cavity is inaccessible. The door frame includes a top member having a first end and a second end opposite the first end, a first side member coupled transversely to the first end of the top member and having a side conduit therein, a second side member coupled transversely to the second end of the top member, and a medial member coupled transversely to the top member between the first end and the second end of the top member.

A door assembly for a refrigeration door system with a defrosting feature. The door assembly also includes a door frame. The door frame may include a top member having a first end and a second end opposite the first end, and the top member may have a top conduit therein. The door frame may also include a first side member coupled transversely to the first end of the top member and having a first conduit therein, the first conduit being fluidly coupled to the top conduit, and a second side member coupled transversely to the second end of the top member and having a second conduit. The second conduit may be fluidly coupled to the top conduit. The door frame may further have orifices positioned along the top member, the first side member, and the second side member. The door assembly also includes a positive pressure source.

A method of operating a heating, ventilation, and air conditioning (HVAC) system includes monitoring a parameter of the HVAC system associated with a temperature of a refrigerant at a heat exchanger, determining if the HVAC system is in an operating condition associated with frost accumulation at the heat exchanger, and adjusting a flow rate of an airflow across the heat exchanger in response to determining that the HVAC system is in the operating condition associated with frost accumulation at the heat exchanger.