Abstract: Methods and systems for controlling the operation of the evaporator fans in a transport refrigeration system (TRS) are described. In some examples, the TRS is a multi-zone temperature control system (MTCS). The methods and systems described herein generally dynamically control a plurality of system fans in MTCSs in instances where running the system fans can lead to inefficiencies in energy consumption and fluctuations in temperature control.

Abstract: A combined accumulator and receiver tank of a refrigeration system is described. The tank may have an accumulator portion positioned above a receiver portion. An accumulator/receiver pipe (AR pipe) connects the accumulator portion to the receiver portion. The AR pipe may have a valve that allows liquid refrigerant to flow from the accumulator portion to the receiver portion during a heating and/or defrost, and prevent the fluid flow when the refrigeration system is in a cooling cycle. In some embodiments, a side opening that is connected to the AR pipe is above an oil pick up orifice of an accumulator suction line pipe.

Abstract: Embodiments to prevent Off Cycle fluid migration in a refrigeration system are described. The embodiments described herein allow a fluid, such as oil from a crankcase sump of a compressor of the refrigeration system, to flow into an anti-fluid migration apparatus positioned in-line along a suction line of the refrigeration system. The fluid can be accumulated in the anti-fluid migration apparatus. The accumulated fluid may form a fluid flow barrier to prevent Off cycle refrigerant migration in the suction line.

Abstract: Embodiments to increase the capacity of the evaporator of a vapor-compression refrigeration system are described. The refrigeration system may be configured to have a first stage suction line heat exchanger and a second stage suction line heat exchanger. The refrigerant exiting the evaporator can be heated by the first heat exchanger. A thermal bulb of an expansion device, such as a thermostatic expansion valve (TXV) can be positioned downstream of the first heat exchanger. The thermal bulb is capable of regulating a variable volume of refrigerant through the expansion device in response to temperature changes. Thus, the superheat refrigerant vapor region in the evaporator can be reduced, thereby increasing the efficiency of the refrigeration system. The refrigerant exiting the evaporator is a liquid/vapor refrigerant mixture. The mixture can be vaporized to a refrigerant vapor in the first heat exchanger.

Abstract: A temperature control system includes a compressor, a condenser, an evaporator, a receiver, and an accumulator. A valve is positioned between the evaporator and the receiver. An evacuation line has a first end in fluid communication with heat transfer fluid between the valve and the receiver, and a second end in fluid communication with the accumulator. The evacuation line provides for flow of the heat transfer fluid from both of the first heat exchanger and the receiver to the accumulator during an evacuation mode of operation of the temperature control system. The valve can take the form of a check valve or an expansion valve without a bleed port.

Abstract: A temperature control system includes a compressor, a condenser, an evaporator, a receiver, and an accumulator. A valve is positioned between the evaporator and the receiver. An evacuation line has a first end in fluid communication with heat transfer fluid between the valve and the receiver, and a second end in fluid communication with the accumulator. The evacuation line provides for flow of the heat transfer fluid from both of the first heat exchanger and the receiver to the accumulator during an evacuation mode of operation of the temperature control system. The valve can take the form of a check valve or an expansion valve without a bleed port.