【Daily Question】Chemical Engineering Principles 081: Heat Transfer Resistance (June 16)
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The Chemical Engineering Theory section is launching the \"One Question per Day\" campaign starting today, aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\". We hope you will give it your active support! Answers to the questions in the \"One Question per Day\" campaign can be viewed directly by replying, and the topic will be closed after 1 day! ! Participation earns 2 wealth points, with an additional 3 wealth points for correct answers~~~ Fill-in-the-blank question: When hot water is heated using saturated steam, the heat transfer resistance increases rapidly after some time; this could be caused by ___________________________________. Condensate water has not been drained, and non-condensable gases have not been removed
The steam condensate is not drained, or the non-condensable gases entrained in the steam accumulate in the upper space.
Condensate has not been drained or non-condensable gases have not been removed
When water is heated with saturated steam, after some time it is observed that the heat transfer resistance increases rapidly
:Condensate water has not been drained or non-condensable gases have not been removed
Condensate water has not been drained or non-condensable gases have not been removed
When this problem occurs on operating production equipment, the most likely cause is scaling on the water side, which increases the thermal resistance of the fouling； Secondly, on the steam side, the high flow rate prevents the steam from condensing in time, so its latent heat is not released; as a result, the total heat transfer amount does not meet the design specifications, which also leads to an increase in thermal resistance
Steam condenses on the wall surface, resulting in an increased heat transfer resistance
When water is heated with saturated steam, after a certain period of time, the heat transfer resistance increases rapidly; this may be caused by __the condensate not being removed or non-condensable gases not being expelled_________________________________.