Heat exchanger K value and non-condensable gas density
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Dear experts: ① Density of \"non-condensable gases\"； ②Plate heat exchanger: Heat transfer occurs between the hot medium, “non-condensable gas”, and the cold medium, “purified water”; the heat transfer coefficient K = _____ W/(m²·K). ③ Shell-and-tube heat exchanger: Heat transfer occurs between the hot medium, “non-condensable gas”, and the cold medium, “purified water”; the heat transfer coefficient K = _____ W/(m²·K)
Regarding the density of non-condensable gases, which is a property of that substance, it is generally a very small value that can be determined through experiments or calculations. For the heat transfer coefficient K of plate heat exchangers and shell-and-tube heat exchangers, this value depends on various factors such as the properties of the fluid, flow velocity, and heat transfer area. Generally, plate heat exchangers have a relatively high heat transfer coefficient, typically ranging from 1000 to 2000 W/(m2·K) ； The heat transfer coefficient of shell-and-tube heat exchangers is relatively low, generally ranging between 300-500 W/(m2·K). It should be noted that the values mentioned above are for reference only; the actual values need to be calculated based on specific conditions or obtained through experiments. .
Coefficients for air and water: 10–60; a value of 50 K (W/㎡·°C) can be used. Air and steam are different, so pay attention to the K value. To determine the density of non-condensable gases, refer to tables based on the specific type of non-condensable gas involved.