Comparison of tubeside condensation and evaporation characteristics of smooth and enhanced heat transfer 1EHT tubes

Applied thermal engineering solutions through process integration, modelling and optimisation

“…The 1EHT surface is generally a hybrid surface that enforces the separation of flow and induces an increased surface area. Kukulka et al [38] investigate experimentally the heat transfer phenomena in the condensation and evaporation of R410A, R22 and R32 at a newly developed enhanced surface Vipertex TM 1EHT tube. This enhanced heat transfer tube produces enhanced performance of more than 100% when compared to a smooth tube for most evaporation or condensation condition.…”

“…Obviously, computer aided process engineering methods and techniques offer the tool-kit for a speedy and effective design procedure. Four contributions investigate the enhancements that new equipment developments bring in fired heaters [37], heat exchangers [38] printed circuit heat exchangers [39], fluidised-bed evaporation [40], and multi-stream spiral-wound heat exchangers [42].…”

Comparison of condensation and evaporation heat transfer on the outside of smooth and enhanced 1EHT tubes

“…It was determined that the behavior of h for three dimensional tubes is significantly different than low fin surfaces. Kukulka et al [7] found that the condensation and evaporation heat transfer performance factor (ratio of enhanced h to smooth tube h) is larger than unity for all conditions considered. Ji et al [8] provides a comprehensive literature survey on the thermal-hydraulic performance of tube side single phase heat transfer.…”

“…Kukulka and Smith [39] present results for a bundle of 1EHT tubes showing an increase in the overall heat transfer coefficient up to 200% when compared to the heat transfer performance of a smooth tube bundle using typical fluids (n-Pentane, p-Xylene and water); for midpoint shellside Reynolds number values in the range of 2010-20,400; with effective mean temperature difference (EMTD) values between 8.6°C and 65.7°C. Kukulka et al [7] performed an experimental investigation in order to determine the evaporation and condensation heat transfer coefficient of R22 and R410A inside the 1EHT tube for low flows. Guo et al [5] performed an experimental investigation to evaluate convective condensation and evaporation of R22, R32 and R410A inside smooth and enhanced tubes.…”

Experimental and Numerical Investigation of the Pressure Drop and Heat Transfer Coefficient in Corrugated Tubes

“…Wang et al [12] showed that spirally corrugated tubes could increase the heat transfer rate by up to 26 % when steam was used compared to smooth tubes. Kukulka et al [13] and Laohalertdecha et al [14] analyzed the effects of corrugated tubes for condensation and evaporation with R410a, R22, R32, and R134a. The advantages of helically corrugated tubes in combination with nanoparticles for turbulent heat transfer were researched by Darzi et al [15] and Mohammed et al [16].…”