Global Conference: Lessons Learned Presentations

Presentations this year will cover modeling lower liquid levels in kettles, tubeside falling film evaporators, and momentum recovery in vacuum condensers.

Lauren V. Moran, Manager, Technical Support
September 14, 2016
The HTRI Global Conference provides an annual opportunity for members and HTRI staff to exchange ideas and opinions that will continue to shape process heat transfer technology. This year’s conference is being held September 19-22 in Seattle, Washington, USA.

The 2016 Global Conference features three Lessons Learned presentations from the Engineering Services team. In these sessions, we highlight either new information that we learned in our research and software development efforts, reasons why particular modeling is used, or finer details of understanding about important topics in process heat transfer.

Lessons Learned: Lower Liquid Level in Kettles – Monday, September 19 at 3:30 PM

Kettles may operate with lower liquid levels to reduce vapor entrainment or to reduce liquid inventory. Engineering Services will focus on new and existing features in Xist® that allow the evaluation of thermal performance in kettles with a lower liquid level. The discussion includes the effects of lower liquid levels on recirculation, the effectiveness of two-phase jets at wetting unsubmerged tubes, and the interpretation of Xist results in such cases.

Kettle liquid level below top row of tubes




Lessons Learned: Falling Film Evaporators – Tuesday, September 20 at 10:30 AM

Tubeside falling film evaporators are specified in situations where typical upflow evaporators do not perform well. Engineering Services will discuss design principles for falling film configurations which are different than those for upflow boiling, including avoiding formulation of rivulets, ensuring liquid film does not break down, minimizing entrainment, and assessing liquid distribution.

Typical falling film evaporator




Lessons Learned: Momentum Recovery in Vacuum Condensers – Tuesday, September 20 at 2 PM

Designing vacuum condensers remains challenging. Engineering Services will discuss traditional and nontraditional tubeside condenser velocity profiles. Traditionally, the highest velocity occurs at the inlet nozzle, but more recently, fluid acceleration in headers has resulted in nonconservative Xist predictions, especially when momentum loss between nozzle and tubes is significant.

Tubeside condenser