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: In-service diagnostic testing of containers with a climate control system used in intermodal freight transport includes automatically testing the functioning of the climate control system at a possibly pre-scheduled time which may depend on the period of time since the latest pre-trip inspection. According to the invention in-service diagnostic testing is performed with cargo in the container during transportation from origin to destination at a suitable time before expected arrival to the destination so that the approval resulting from the in-service diagnostic testing is fresh and up-to-date. Results of the in-service diagnostic testing are transmitted wirelessly to a receiver at a central facility where managing and allocating a large number of containers to individual transport tasks is performed, and containers which have not passed the in-service diagnostic testing can be taken out of service for maintenance and repair.

Abstract: In-service diagnostic testing of containers with a climate control system used in intermodal freight transport includes automatically testing the functioning of the climate control system at a possibly pre-scheduled time which may depend on the period of time since the latest pre-trip inspection. According to the invention in-service diagnostic testing is performed with cargo in the container during transportation from origin to destination at a suitable time before expected arrival to the destination so that the approval resulting from the in-service diagnostic testing is fresh and up-to-date. Results of the in-service diagnostic testing are transmitted wirelessly to a receiver at a central facility where managing and allocating a large number of containers to individual transport tasks is performed, and containers which have not passed the in-service diagnostic testing can be taken out of service for maintenance and repair.

Abstract: In-service diagnostic testing of containers with a climate control system used in intermodal freight transport includes automatically testing the functioning of the climate control system at a possibly pre-scheduled time which may depend on the period of time since the latest pre-trip inspection. According to the invention in-service diagnostic testing is performed with cargo in the container during transportation from origin to destination at a suitable time before expected arrival to the destination so that the approval resulting from the in-service diagnostic testing is fresh and up-to-date. Results of the in-service diagnostic testing are transmitted wirelessly to a receiver at a central facility where managing and allocating a large number of containers to individual transport tasks is performed, and containers which have not passed the in-service diagnostic testing can be taken out of service for maintenance and repair.

Abstract: A refrigeration system for a container for refrigerating chilled cargo includes a compressor, a condenser, and an evaporator connected in series. The system further includes a heater and sensors configured to sense the temperature of the supply air and the temperature of the return air. A controller is programmed to determine one of a requirement for heating and a requirement for cooling based on the temperature of the return air and the temperature of the supply air. The controller is programmed to activate the evaporator fan when a requirement for heating is determined and to increase the speed of the evaporator fan when increased heating is determined. The controller is also programmed to activate the compressor and the evaporator fan when a requirement for cooling is determined and to increase the power supplied to the compressor and maintain the evaporator fan at a first speed when increased cooling is determined.

Abstract: A method for operating a refrigeration system for a container to pull down the temperature of cargo from ambient to a predetermined set-point temperature, and a system employing the method. The method includes operating a compressor at a first power to compress a refrigerant and direct the refrigerant through a condenser and an evaporator of the refrigeration system, initially operating an evaporator fan at a first speed to supply refrigerated supply air from the evaporator to the cargo within the container, sensing the temperature of the supply air, comparing the temperature of the supply air with a predetermined set-point temperature, and increasing the speed of the evaporator fan to a second speed faster than the first when the temperature of the supply air is lower than the predetermined set-point temperature to maintain the temperature of the supply air at the predetermined set-point temperature.

Abstract: In-service diagnostic testing of containers with a climate control system used in intermodal freight transport includes automatically testing the functioning of the climate control system at a possibly pre-scheduled time which may depend on the period of time since the latest pre-trip inspection. According to the invention in-service diagnostic testing is performed with cargo in the container during transportation from origin to destination at a suitable time before expected arrival to the destination so that the approval resulting from the in-service diagnostic testing is fresh and up-to-date. Results of the in-service diagnostic testing are transmitted wirelessly to a receiver at a central facility where managing and allocating a large number of containers to individual transport tasks is performed, and containers which have not passed the in-service diagnostic testing can be taken out of service for maintenance and repair.

Abstract: A method of controlling a refrigeration system with a closed circuit for circulating a refrigerant wherein the closed circuit has a compressor for compressing the refrigerant, a condenser for receiving and condensing at least part of the compressed refrigerant, an evaporator for receiving and evaporating the condensed refrigerant, and a return conduit for returning the refrigerant from the evaporator to the compressor. The evaporator has several evaporator sections with corresponding conduits that may be individually controlled so as to obtain individual refrigeration effects of corresponding individual evaporator sections.

Abstract: A method for operating a refrigeration system for a container for refrigerating chilled cargo, and a system employing the method. The method includes providing a refrigeration system including a compressor, a condenser, an evaporator, an evaporator fan, and a heater. The method also includes determining the temperature of the supply air discharged into the container and the return air from the container, determining one of a requirement for heating and a requirement for cooling based on the temperatures of the return air and the supply air, activating the evaporator fan when a requirement for heating is determined and increasing the speed of the evaporator fan when increased heating is determined, and activating the compressor and the evaporator fan when a requirement for cooling is determined and increasing the power supplied to the compressor and maintaining the evaporator fan at a first speed when increased cooling is determined.