Monthly Archives - November 2025

مطالعه مقایسه‌ای دقیق و دسته‌بندی‌شده بین دو نوع کویل فین تیوب (فین آلومینیومی — تیوب مسی) و کویل فین تیوب با تیوب آلومینیومی، از منظر انتقال حرارت، تحمل فشار و مقاومت به خوردگی ارائه شده است.
20Nov

Comparative Study Between Two Types of Fin Tube Coils

A detailed and categorized comparative study between two types of fin tube coils (aluminum fin - copper tube) and fin tube coil with aluminum tube, from the perspective of heat transfer, pressure resistance and corrosion resistance, is presented. Construction and materials Coil type A (aluminum fins + copper tubes): Fins are aluminum (common alloys) and tubes are copper (Cu). Fin-to-tube connection is commonly made by mechanically wrapping the fin around the tube, brazing/soldering, or using expanded joints. Coil type B (aluminum fins +...

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مقایسه مهندسی تیوب‌های مسی 8/5" با ضخامت‌های دیواره 0.50، 0.63 و 0.70 میلی‌متر
18Nov

The engineering comparison of 5/8″ copper tubes with wall thicknesses 0.50 mm, 0.63 mm and 0.70 mm used in a water coil (fin-tube) with aluminum fins

Below is the engineering comparison of 5/8" copper tubes with wall thicknesses 0.50 mm, 0.63 mm and 0.70 mm used in a water coil (fin-tube) with aluminum fins. Internal heat transfer (controlled by conduction and convective heat-transfer coefficient) Internal convective heat-transfer coefficient (hi): for the same volumetric flow rate, thinner-wall tubes (0.50 mm) have a slightly larger internal radius and therefore slightly lower pressure drop and a similar or slightly higher hi compared with thicker tubes. Changes are usually small and mainly...

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فین ستاره ای آلومینیومی
11Nov

Aluminum star-shaped fin

This study examines the effect of an aluminum star-shaped fin, placed along the axis of 5/8-inch copper tubes with a specific twist, on heat transfer in a shell-and-tube evaporator. The objective is to evaluate the enhancement of heat exchange and the reasons for using this geometric arrangement in refrigeration and HVAC applications. Fin design and configuration The star-shaped fin is formed from aluminum sheet into a multi-branch profile that fits inside a 5/8-inch copper tube and is twisted gently around the longitudinal...

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Comparison of mechanical pressure resistance in 5/8 inch tubes with wall thicknesses of 0.5, 0.63, and 1.0 mm
04Nov

Comparison of mechanical pressure resistance in 5/8 inch tubes with wall thicknesses of 0.5, 0.63, and 1.0 mm

Introduction: This study briefly examines the mechanical and thermal behavior of copper tubes (5/8 in. size) with three different wall thicknesses (0.5 mm, 0.63 mm and 1.0 mm) in fin-tube coils. The goal is to determine approximate allowable pressure and temperature ranges and to explain performance differences resulting from wall-thickness variation. Material properties and assumptions: Material: commercial copper (e.g., C110) with ultimate tensile strength around 200–250 MPa and typical yield/working strength ~220 MPa, Young’s modulus ≈ 110 GPa. Outer tube diameter 5/8 in ≈...

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