http://www.roliv.com/steam-passes-through-heat-exchanger-without-sufficient-heat-exchange-what-is-roll-of-press-regulator-at-inlet.html Jobs Salary Internship Colleges Careers Syllabus Notes Sat, 30 Jan 2010 06:39:26 -0700 http://wordpress.org/?v=2.9.2 hourly 1 http://www.roliv.com/steam-passes-through-heat-exchanger-without-sufficient-heat-exchange-what-is-roll-of-press-regulator-at-inlet.html/comment-page-1#comment-412 Bomba Tue, 12 Jan 2010 06:20:35 +0000 http://www.roliv.com/steam-passes-through-heat-exchanger-without-sufficient-heat-exchange-what-is-roll-of-press-regulator-at-inlet.html#comment-412 If your steam is 100% pure steam, I can't see how dropping the pressure would help, in fact you loose some energy due to entropy loss by going through the pressure regulator. However, if your main steam is less than 100% pure, a steam/water mix, it might help. If you drop the pressure, at least some of the water would flash to steam and condensing steam has a much higher heat transfer coefficient than flowing water. This may increase the amount of heat transfer in the exchanger. If your steam is 100% pure steam, I can’t see how dropping the pressure would help, in fact you loose some energy due to entropy loss by going through the pressure regulator.
However, if your main steam is less than 100% pure, a steam/water mix, it might help. If you drop the pressure, at least some of the water would flash to steam and condensing steam has a much higher heat transfer coefficient than flowing water. This may increase the amount of heat transfer in the exchanger.

]]> http://www.roliv.com/steam-passes-through-heat-exchanger-without-sufficient-heat-exchange-what-is-roll-of-press-regulator-at-inlet.html/comment-page-1#comment-411 shahzad1 Tue, 12 Jan 2010 05:57:32 +0000 http://www.roliv.com/steam-passes-through-heat-exchanger-without-sufficient-heat-exchange-what-is-roll-of-press-regulator-at-inlet.html#comment-411 I will suppose that the design of the heat exchanger is adequate, that air has been removed from the steam condensing surfaces. Also that the medium being heated has a desired temperature somewhat below 370 F (for 175 psia) or 363F (for 160 psia) The driving force in heat exchange is temperature difference. If the rate of heat exchange is insufficient, the temperature difference needs to be raised by increasing the condensing pressure of the steam, not lowering it. The pressure regulator should be reset for a higher pressure. If the regulator is already wide open and the condensing pressure is already at 160 psi and insufficient, the initial pressure of the steam supply must be raised. I will suppose that the design of the heat exchanger is adequate, that air has been removed from the steam condensing surfaces. Also that the medium being heated has a desired temperature somewhat below 370 F (for 175 psia) or 363F (for 160 psia)
The driving force in heat exchange is temperature difference. If the rate of heat exchange is insufficient, the temperature difference needs to be raised by increasing the condensing pressure of the steam, not lowering it. The pressure regulator should be reset for a higher pressure.
If the regulator is already wide open and the condensing pressure is already at 160 psi and insufficient, the initial pressure of the steam supply must be raised.

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