Dew nation points value8/4/2023 ![]() ![]() This appears to me to be the complete opposite of the definitions described in our textbooks and on the various web sites I've looked at. To determine subcooling, use Bubble Point values." Sporlan's web site also says this, as does the PT chart at ICOR International. On the bottom of these PT charts is a line which reads, " To determine superheat, use Dew Point values. Our classrooms have wall-mounted pressure-temperature charts produced by Sporlan, and we are given pocket-size PT charts also produced by Sporlan. A simple internet search for "zeotropic blends" led me to a number of sites discussing this topic, and offering the same explanation for Bubble Point and Dew Point. ![]() So, in essense, Bubble Point refers to superheating and Dew Point refers to subcooling. The saturated refrigerant changes state to become a subcooled liquid before going to the metering device. The point in the system where a saturated vapor refrigerant begins to condense into a liquid is in the condenser, on the high-pressure side of the system. The saturated refrigerant changes state to become a superheated vapor before going into the compressor. The point in the system where a saturated liquid refrigerant begins to boil into a vapor is in the evaporator, on the low-pressure side of the system. ![]() Dew Point is described as the saturated vapor pressure, or the pressure/temperature at which the first drop of liquid condenses from a vapor. In that chapter, Bubble Point is described as the saturated liquid pressure, or the pressure/temperature at which the first bubble of vapor appears in a liquid refrigerant. In our textbook, Heating and Cooling Essentials by Jerry & LaDonna Killinger, Chapter 14 discusses zeotropic blends, fractionation and temperature glide, etc. I am a student currently attending a refrigeration technical training class in Las Vegas, and I'm confused by an apparent contradiction I have found between various sources about using Bubble Point and Dew Point values. ![]()
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