Abstract
Measurements on a semi-welded plate heat exchanger (PHE) and on various versions of the nickel-brazed PHE were performed in a large experimental refrigeration rig. Experiments were carried out with the refrigerant ammonia, which was completely evaporated in vertical upward flow in PHEs connected in a U-type manner. A multiple linear regression analysis produced three Nusselt number correlations for the different PHEs that can predict the measured Nusselt number decently. The values for the C-coefficient (in the correlation of the two-phase multiplier) for the higher Reynolds number are somewhat higher than those reported in other investigations. An inlet flow distributor in the semi-welded heat exchanger made it possible to achieve a higher performance at low ΔT out. The nickel-brazed heat exchanger with an integrated inlet flow distributor was found to have a better performance compared to a nickel-brazed heat exchanger without the flow distributor.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
