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.

Abstract: An amplifier system can include a biasing amplifier that provides a first amplified signal to a DC blocking element that is connected with a load based on a first control signal. A power amplifier provides a second amplified signal for driving the load based on a second control signal. A control system controls the biasing amplifier to charge the DC blocking element so as to mitigate a voltage drop across the load (e.g., to substantially eliminate audible artifacts) when the power amplifier is activated to provide the second amplified signal.