Experimental assessment and semi empirical estimation of frost accretion—A case study on a spine-finned inverted-V tube array evaporator

Abstract

Present work focuses on frost accretion in a spine-finned inverted-V tube array evaporator. An experimental evaluation was performed using a standard issue, vertical top-mount, 18 cubic feet, 0.5 m3, refrigerator. Evaporator temperature distribution, inner airflow velocity, and relative humidity were measured to account for convective phenomena influencing frost distribution. Frost formation and accretion on the surface of the evaporator were visualized using thermal and microscopic imagery. The images were processed using a machine vision algorithm to measure frost thickness. Complementarily, frost density and vapor mass transfer were computed using available correlations. An estimation function was derived from the compiled data using a semi empirical approach, i.e., direct measurements and thermophysical substance properties. The resulting mathematical expression estimated the frost accretion rate within an error expectancy, RMSE, of 0.1479 and displayed a goodness-of-fit, R-Squared, of 0.9029. Based on these results, semi empirical estimation, is proposed as a viable approach to construct adequate limits for new predictions, vis-à-vis evaporator performance, ultimately reducing appliance energy consumption via implementing more effective control strategies regarding internal defrosting.

Experimental investigation of shell and helical coiled heat exchanger with Al2O3 nano-fluid with wide range of particle concentration

“…Heat exchangers are implemented in many engineering applications such as nuclear power plants, aerospace industries, air conditioning systems, chemical plants, oil refineries, refrigeration systems, power systems (Azadi et al, 2023;Carvajal-Mariscal et al, 2023;Khargotra et al, 2023;Maithani et al, 2023;Kumar A. P. et al, 2024;Luo et al, 2024;Moghadam et al, 2024). The design, application, space constraints, and fluid flow patterns in such applications influence the shape and size of heat exchangers, which are devices that transport or exchange heat between two fluids without mixing them.…”