Publications
Showing 9 results for Author: Saad A. Jajja
Aug, 2026
Conference Paper
Thermal-Hydraulic Performance of a Zeotropic Refrigerant in a Brazed Plate Evaporator
In this work we report the results of a preliminary investigation focused on evaluating the thermal-hydraulic performance of R455A (CO2, R32, R1234yf – 3/21.5/75.5) in a commercial brazed plate heat exchanger. Three key parameters were measured which were refrigerant flow maldistribution, overall refrigerant side heat transfer coefficient, and total refrigerant side pressu…
Mar, 2026
Conference Paper
Optimizing flow condensation models for next-generation refrigerants in axial micro-fin aluminum tubes
To support the transition to next-generation refrigerants, accurate modelling of heat transfer and pressure drop is essential for designing efficient heat exchangers. Current models, largely based on traditional refrigerants and unexpanded micro-fin tubes, may not reliably predict performance for new refrigerants and expanded micro-fin geometries. This study evaluates four…
Jul, 2024
Journal
In tube condensation of low global warming potential refrigerants in an axial micro-fin aluminum tube
Environmental regulations have driven the development of refrigerants with low global warming potential (GWP). To design heat exchangers using these new refrigerants, data are needed concerning the heat transfer coefficient and pressure drop in two-phase flow. Another change is the increasing use of aluminum tubes rather than copper tubes to reduce heat exchanger cost. Hen…
Nov, 2023
Journal
Environmental stability of additively manufactured siliconized silicon carbide for applications in hybrid energy systems
A key consideration for the successful operation of hybrid energy systems will be the environmental stability of materials used for their construction, particularly when experiencing service environments containing water vapor at high temperatures. Here, we report results from the characterization of siliconized silicon carbide (Si-SiC) prepared via binder jet additive man…