The ammonia cooling temperature is low, at -4 degrees, but the pipes do not frost over. Why is that?
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The ammonia cooling temperature is low, at -4 degrees, but the pipes do not frost over. Why is that?
Due to the low outdoor temperature, which is already below 4 degrees, the water vapor at this temperature has dropped below the saturation point; therefore, no freezing occurs in the pipes. It is a normal phenomenon.
When the temperature is below -4 degrees Celsius, on pipes that lack insulation, although there is no frost, condensation water forms as air cools down. For frost to form, heat must be absorbed, but hot air is always available to replenish that heat! As a result, water can never turn into frost. When the water droplets become too large, they slide down the pipes. The ground beneath the pipes will appear wet, but frost can be seen at the flange connections, because the flanges are deep enough that hot air cannot disperse the cold air in time, allowing water to turn into frost. This post was last edited by snowdfr on 2009-3-27 at 17:16
The original post was published by snowdfr on 2007-12-31 at 21:26. When the temperature is below -4 degrees Celsius, condensation forms on the pipes. Even if the pipes lack insulation, frost doesn’t form, but condensation water does appear; air condenses to form water, and for frost to form more heat is needed, yet hot air continuously supplies that heat! As a result, water never turns into frost. When the water droplets become too large, they slide down the pipes. One can see the ground below the pipes... The analysis makes sense; I strongly agree with it! ! !
I agree with what was said on the third floor; it’s mainly due to the high ambient temperature, which prevents the heat from being removed promptly. Frost should form when the temperature drops to a certain level. One of the flanges on our ammonia cooling outlet pipe lacks insulation, so frost forms in winter, but not in summer.
The ammonia cooling temperature is low, at -4 degrees. Is that considered low or high? We usually have temperatures around minus ten degrees
I agree with the analysis above: condensation into water is the first step, while frosting is a further stage. Furthermore, there is often condensation water in summer and frost in winter, which is closely related to the ambient temperature; in addition, air humidity is also a major factor.
What was said on the third floor is correct; frosting occurs where there is throttling.
Supported. A temperature of minus 4 degrees is neither too low nor too high; if it’s too low, the pressure of gaseous ammonia drops, making it easy for liquid ammonia to form, while if it’s too high, the amount of ammonia separated in the condenser is reduced.
-Will the ammonia-cooled pipes at 4 degrees frost over, and to what extent? It mainly depends on the outdoor temperature. It is related to the level of air humidity