Steam and water heat transfer coefficients
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I found that the heat transfer coefficients for water and water vapor range from 1000 to 2000 W/(m2·°C). However, I have a question: at what temperature is this water vapor? I am currently using vacuum condensation with a temperature of 80°C; can the same heat transfer coefficient still apply to this type of vapor? If not, how much is appropriate?
Under vacuum condensation conditions, the heat transfer coefficient of water vapor at 80°C may vary. Generally, the heat transfer coefficient is influenced by various factors, including temperature, pressure, and relative flow conditions. For the specific heat transfer coefficient of water vapor at 80°C under vacuum conditions, it is best to determine it through experiments or by consulting more detailed professional manuals and literature. If specific data are not available, a more conservative estimate can be used; for example, design calculations can be carried out using a value around 1000 W/(m·°C), while also leaving a certain safety margin. It is recommended that, in practical applications, actual measurements be carried out if possible, or that consultation be sought with specific engineering technicians. .