Imam Mohammad Ibn Saud Islamic University

Nashmi H Alrasheedi

Aissa Rezzoug

Omar Eid Almutairi

Arpan Kumar Mondal

Barun Haldar

Naser A Alsaleh

Atul Singh Rajput

Rashid Khan

The Four Sides Sub-Wet Bulb Cell (4SSBC) is an innovative evaporative cooling system designed for outdoor environments, particularly in dry and hot regions. Unlike conventional indirect evaporative cooling systems, which typically rely on two-sided heat exchange, the 4SSBC introduces a four-sided heat exchange process. This unique configuration significantly enhances cooling efficiency while reducing water consumption. The 4SSBC utilizes porous materials, including ceramics and synthetic media, for optimized heat and mass transfer. Furthermore, the 4SSBC is designed to be integrated into decorative cooling structures for recreational outdoor spaces, providing a more comfortable environment for occupants. The system ensures that fresh air is produced without excessive humidity, offering a sustainable and efficient solution for outdoor comfort in recreational areas during night time.

Indirect evaporative cooling and four sides sub-wet bulb cell (4SSBC) for outdoor evaporative cooling structures

An apparatus and a polishing system for rotational magnetorheological abrasive flow nano-finishing are described. The apparatus includes an upper cylinder with coupled upper piston and a lower cylinder with coupled lower piston. A first motor drives synchronized reciprocating motion of both pistons via respective slider crank mechanisms. A magnet fixture positioned between the cylinders includes permanent magnets arranged in a ring configuration with a central hole for workpiece placement. A second motor rotates the magnet fixture to manipulate magnetic field orientation. The cylinders, pistons and magnet fixture define a space for containing magnetorheological (MR) fluid including ferromagnetic particles, abrasive particles and carrier fluid. The configuration enables controlled fluid flow through the hole while maintaining direct workpiece contact, with ferromagnetic particles exhibiting both rotational and reciprocal movement patterns. This dual-motion finishing approach enables material removal through magnetic field-controlled abrasive action, achieving nano-scale surface quality on complex geometries.

Magnetorheological abrasive flow nano-finishing (RR-MRAFNF) machine

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Riyadh, Saudi Arabia

Nashmi H Alrasheedi