What temperature difference is required for sweating to occur?
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In summer, if water pipes at 5°C are not insulated, their walls will \"sweat\", but the circulating water will not. I would like to ask the experts: what temperature difference is required for this sweating phenomenon to occur?
The condensation of pipes at temperatures below the ambient temperature occurs when the temperature of the surrounding environment reaches the dew point corresponding to that low temperature; in other words, the moisture content in the current environment is equivalent to the saturated vapor pressure of water at that low temperature. You can take a look at the wet-bulb and dry-bulb thermometer; the wet-bulb temperature is essentially the temperature at which dew forms.
Pipe sweating occurs when the air humidity is high; it meets pipes with smooth surfaces whose temperature is lower than that of the air, and condensation water forms, resulting in this sweating phenomenon. After all, the temperature of the circulating water is higher than that of the air, so even if water droplets form, they will evaporate. The wall and floor tiles in the home also sweat when the air pressure is low and the humidity is high.
I remember someone previously uploading a table showing the relationship between moisture content and dew point; you’ll understand once you see it