Abstract: Provided is a heat exchanger arrangement for a refrigeration system. The heat exchanger arrangement comprises a heat exchanger having a first flow path, a second flow path, and a heat exchange interface that is configured to transfer heat between a first fluid in the first flow path and a second fluid in the second flow path, in use. The heat exchanger arrangement also comprises an inlet arrangement having a first-fluid inlet for receiving the first fluid from a source, a first opening into the first flow path, and a second opening into the first flow path. The inlet arrangement is operable to control flow of the first fluid from the first-fluid inlet to the first opening and to the second opening.

Abstract: Provided is a refrigeration system for a transport unit. The refrigeration system has a refrigeration cycle comprising a compressor, an evaporator, a condenser fluidically coupled downstream of the compressor and upstream of the evaporator, an expansion valve fluidically coupled downstream of the condenser and upstream of the evaporator, and a suction gas heat exchanger comprising a liquid line side and a suction line side. The liquid line side is fluidically coupled downstream of the condenser and upstream of the expansion valve, and the suction line side is fluidically coupled downstream of the evaporator and upstream of the compressor. The suction gas heat exchanger is configured to transfer heat between refrigerant in the liquid line side and refrigerant in the suction line side.

Abstract: Provided is a cascade refrigeration system for a transport unit. The cascade refrigeration system has a first refrigeration cycle comprising a first compressor and a first expansion valve, a second refrigeration cycle comprising a second compressor and a second expansion valve, and a cascade heat exchanger. The cascade heat exchanger comprises a condenser side fluidically coupled downstream of the first compressor and upstream of the first expansion valve, and an evaporator side fluidically coupled downstream of the second expansion valve and upstream of the second compressor. The cascade refrigeration system also comprises a pre-cooler comprising a first side and a second side. The first side is fluidically coupled downstream of the first compressor and upstream of the condenser side of the cascade heat exchanger, and the pre-cooler is configured to transfer heat between refrigerant in the first side and refrigerant in the second side.

Abstract: A method of determining a refrigerant or a composition of refrigerants in a refrigeration system comprising an expansion valve, an evaporator, one or more evaporator fans, a condenser, one or more condenser fans one or more temperature sensors, one or more pressure sensors, a compressor, and a controller for controlling the refrigeration system, the controller comprising a memory, the expansion valve, the evaporator and the compressor being fluidly interconnected in a refrigerant path having refrigerant flowing therein, comprising the steps of: a) Running a test run and read out values from one or more of the sensors; b) Determining a composition by the result of step a; and c) Adjusting the refrigeration system in relation to the composition determined by step b. Also disclosed is a controller for controlling a refrigeration system and a cooling machine in a reefer container.

Abstract: A method for controlling ripening of vegetable produce in a second transport unit is disclosed. The method comprises obtaining, at the second transport unit, ripening data from a first transport unit, which first transport unit carries produce from a same geographical area as the second transport unit; correlating, at the second transport unit, the obtained ripening data with a scheduled delivery date for the second transport unit; and controlling, at the second transport unit, a ripening process of the produce during transport based on the correlated data for achieving a desired ripening stage in the produce at the scheduled delivery date.

Abstract: The invention relates to a method of determining a refrigerant or a composition of refrigerants in a refrigeration system (1) comprising an expansion valve (2), an evaporator (3), one or more evaporator fans (4), a condenser (5), one or more condenser fans (6) one or more temperature sensors (7), one or more pressure sensors (8), a compressor (9), and a controller (25) for controlling the refrigeration system (1), the controller (25) comprising a memory (26), the expansion valve (2), the evaporator (3) and the compressor (6) being fluidly interconnected in a refrigerant path (10) having refrigerant flowing therein, comprising the steps of: a) Running a test run and read out values from one or more of the sensors (7, 8); b) Determining a composition by the result of step a; and c) Adjusting the refrigeration system (1) in relation to the composition determined by step b. The invention further relates to a controller (25) for controlling a refrigeration system (1) and to a cooling machine in a reefer container.

Abstract: The invention relates to a reefer container (1) having a controlled atmosphere system (3) comprising:—a first selective unit (4) comprising an absorber or a membrane (9) being selective for carbon dioxide over oxygen and nitrogen;—a second selective unit (11) comprising an absorber or a membrane (14) being selective for oxygen over nitrogen; and—a vacuum pump (6) for extracting and removing separated gasses from a permeate side (8, 13) of the first and second selective units (4, 11) to outside the container(1), where the system (3) is further comprising a pump (15) for providing an overpressure in the container(1). The pump (15) can be connected to the container (1) through a feed side (12) of the second selective unit (11). The invention further relates to a method of controlling reefer container (1) having a controlled atmosphere system (3).

Abstract: The present invention relates to a method of ripening perishable products during transport in a structure including a controlled atmosphere system, which method provides variable ripening time by changing temperature in the structure from a temperature where ripenable produce are kept in an unripening controlled atmosphere to a temperature where the ripenable products ripens in controlled atmosphere. The present invention further relates to a structure for shipping perishable products such as fruit and vegetables, which structure includes a controlled atmosphere system including sensors capable of measuring at least one of following parameters: temperature, O2 or CO2; a dosing mechanism for dosing ripening agent; and a ripening process controller, which controller controls the ripening process based on sensed values of temperature, O2 and/or CO2.

Abstract: A method for operating a refrigeration system in order to perform temperature control of a closed volume is disclosed. The refrigeration system comprising a compressor, a condenser, an expansion device and an evaporator connected in series in a refrigerant flow path. The refrigeration system further comprises one or more fans arranged to cause a flow of air across the evaporator. The compressor is controlled by switching the compressor on or off in accordance with a measured temperature, Tsup, of air which has passed across the evaporator and is being supplied to the closed volume, and in order to achieve a set point temperature, Tset, in the closed volume. During this a compressor switching pattern is determined. Temperature fluctuations inside the closed volume are minimized, and energy is conserved.

Abstract: Temperature is controlled in a refrigerated transport container comprising a transport volume, a control unit, a cooling space, one or more fans providing air flow through the cooling space, where air passing through the cooling space passes a return air temperature sensor, a cooling unit, and a supply air temperature sensor. Supply air temperature (Tsup) is controlled to bring temperatures in the transport volume within a desired temperature range around a first temperature set point (Tset). The supply air temperature (Tsup) or a time-averaged function thereof is controlled to reach a temperature below the set point (Tset) during a first limited time period; and the supply air temperature (Tsup) is increased during a second limited time period following said first time period, so that the supply air temperature (Tsup) or a time-averaged function thereof at the end of said second time period is within said desired temperature range.

Abstract: Temperature is controlled in a refrigerated transport container comprising a transport volume, a control unit, a cooling space, one or more fans providing air flow through the cooling space, where air passing through the cooling space passes a return air temperature sensor, a cooling unit, and a supply air temperature sensor. Supply air temperature (Tsup) is controlled to bring temperatures in the transport volume within a desired temperature range around a first temperature set point (Tset). The supply air temperature (Tsup) or a time-averaged function thereof is controlled to reach a temperature below the set point (Tset) during a first limited time period; and the supply air temperature (Tsup) is increased during a second limited time period following said first time period, so that the supply air temperature (Tsup) or a time-averaged function thereof at the end of said second time period is within said desired temperature range.