Why metering device flash from liquid to gas?
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Asked in Physics, Energy, Refrigerators
Define flash gas and how it applies to the net refrigeration effect of the refrigeration cycle?
Does refrigerant enter evaporator as a liquid in a direct expansion evaporator?
It will, in basically all cases be a mixture of liquid and vapor, which means the refrigerant is saturated but with a few bubbles entering the evaporator. In a properly operating system though entering the metering device should be solid liquid and some sub-cooling (sub-cooled means cooler then saturation and therefore= no vapor) but then through the metering device (TXV, cap tube, orifice) some of the liquid will boil off, which is called flash gas, in order to cool the refrigerant down as saturated temperature goes down (the pressure to boiling point relation, as pressure is reduced boiling point is lowed). The amount of flash gas is directly related to the specific heat of the refigernt (BTUs/lb), the number of degrees you are cooling the refrigerant (eg. 95 to 45), and the latent heat of vaporization (BTUs/lb for change of state. liquid to vapor)
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Describe flash gas and tell how affects system capacity?
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What is the function of Flash drum in a gas sweeting plant?
What is metering skids system?
metering system assembly consists of the following sub-skid: 1. Metering skid, consist of ultrasonic flow meter, pressure transmitter, temperature transmitter, pressure gauge, temperature gauge etc. 2. Analyzer shelter, consist of gas chromatograph, dew point analyzer, and moisture analyzer. 3. Gas metering panel, consist of flow computer and station computer (usually gas metering panel are located inside the control room).
Asked in Refrigerators
What percent vapor is refrigerant when entering the evaporator?
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What is the process from a liquid to gas and gas to liquid?
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When an air conditioner kicks on what should happen?
Depending on the type and complexity of the AC the following must happen, it may happen all at one time or sequentially to save power costs Evaporator fan start Condenser fan start Compressor start Then inside the unit: The gas will be compressed into the condenser coil where it cools and becomes a liquid The liquid travels to a metering device, on some simple systems a orifice tube, on some more complex systems to an expansion valve The valve sprays the liquid into the evaporator where the liquid gets very cold by turning into gas. The gas then returns to the compressor. Hopefully you are feeling cold air by now.