Maersk Container Industry A/s

A.p. Moller-maersk A/s

Poul Kim Madsen

Lars Mou Jessen

Leijn Johannes Sjerp Lukasse

Georg Fösel

Ole Thøgersen

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.

Calibration method of refrigerant saturation temperature in a refrigeration system, a controller for applying such a method and a cooling machine

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, T, 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, T, in the closed volume. During this a compressor switching pattern is determined. Temperature fluctuations inside the closed volume are minimized, and energy is conserved.

Method for operating a refrigeration system for a cargo container

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.

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Loegumkloster, Denmark

Poul Kim Madsen