VIP ECO ULT Freezers Feature note: Increased efficiency = lower running costs - 2 Pages

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Catalogue excerpts

How it works A refrigerant is a fluid that transfers heat from one area to another. In a freezer, the refrigerant is used to cool the cabinet to the desired temperature by transferring heat from inside the freezer to the external environment through a cycle of thermodynamic processes. In a typical refrigeration system, the refrigerant gas is compressed, then cooled and condensed into a liquid. This liquid refrigerant then travels through a small capillary which increases the pressure of the refrigerant. When the high pressure liquid leaves the capillary, it enters a low pressure environment. This sudden change in pressure causes the liquid refrigerant to spray out of the capillary and evaporate. To revert back to its natural, gaseous state the refrigerant will need to absorb heat from its surroundings. It is this process of vaporization that draws heat from the freezer cabinet and this cycle will continue until the desired temperature is reached. The most important property of a refrigerant is its boiling point. This should be low in order to draw heat from the freezer to achieve the required temperature, but not too low as this presents problems with the condensing stage of the refrigeration cycle.The ideal refrigerant would have a boiling point just below the desired temperature of the freezer. VIP ECO Ultra-low freezers use two hydrocarbon refrigerants. The low-stage refrigerant is used to remove heat from the freezer cabinet to provide a secure ultra-low (-86ºC) storage environment. Since the low-stage refrigerant gas cannot condense back to a liquid at room temperature a second, high-stage refrigeration, circuit is used to cool a cascade condenser to around -40ºC. Which is low enough to condense the refrigerant gas in the low-stage. This system is known as cascade cooling. In the high-stage refrigeration circuit of VIP ECO Ultra-low freezers, R-290 (propane) is used to remove the heat from the low-stage circuit. High stage refrigerant gas High stage refrigerant liquid (ethane) to remove the heat from the freezer cabinet itself. Ethane has a boiling point of -88.2ºC which enables it to cool the freezer to ultra-low temperatures. Low stage refrigerant liquid Panasonic cascade cooling Sensors (not shown) Temperature sensors throughout the high and low stage circuits transmit information to the Panasonic controller for operation, monitoring and diagnostics. Propane has a boiling point of -42.1ºC so provides an ideal temperature to condense the lowstage refrigerant. The low-stage refrigerant circuit uses R-170 Feature Note VIP ECO Ultra Low Freezers: Increased efficiency = lower running cost

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How it saves: the benefits of hydrocarbon refrigerants Reduced running costs The use of highly efficient hydrocarbon refrigerants results in reduced energy consumption and therefore lower running costs. With key equipment and instrumentation operating continuously laboratories are able to significantly reduce running costs by investing in energy efficient facilities. Panasonic designs and builds advanced preservation systems to deliver maximum cost efficiency while maintaining the reliability and performance necessary for reliable storage of valuable research and clinical samples. Alongside a...

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All Panasonic Biomedical Europe catalogues and technical brochures

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