بایگانی‌ها Articles

04NovNovember 4, 2025

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 ≈...

By پیمان داوریArticles, Technichal Points, Trainingmechanical pressure resistance, tube

نقش اکسید آلومینیوم در کویل فین تیوب (فین آلومینیومی و تیوب مسی): تأثیرات بر انتقال حرارت و خوردگی

30OctOctober 30, 2025

The Role of Aluminum Oxide in Fin Tube Coils Aluminum Fins and Copper Tubes

Effects on Heat Transfer and Corrosion Aluminum oxide (Al2O3), present as an oxide film on aluminum fins or as suspended/ deposited particles, has both positive and negative effects on the performance of fin tube coils (aluminum fins with copper tubes). Below is a concise review of these effects and the underlying mechanisms. Positive effects • Surface protection: A passive aluminum oxide film can act as a relatively stable protective layer that inhibits further corrosion of aluminum. This layer shows reasonable resistance to mildly...

By پیمان داوریArticles, Technichal Points, TrainingAluminum Fins Tube, Aluminum Oxide, Copper Tube

حذف یا کاهش فاصله هوایی بین فین آلومینیومی و تیوب مسی در کویل

28OctOctober 28, 2025

Elimination or Reduction of Air Gap between Aluminum Fins and Copper Tubes in Coils

Eliminating the air gap between aluminum fins and copper tubes in fin-and-tube heat exchangers (coils) is an important step in design and manufacturing that directly affects thermal performance, energy consumption, durability, and operating costs. This study examines why the issue matters, the effective heat-transfer mechanisms, technical and economic consequences, and practical implementation methods. Importance of Contact-Based Heat Transfer In fin-and-tube exchangers the primary objective is rapid and efficient heat transfer from the tube surface (carrying hot or cold fluid) to the air...

By پیمان داوریArticles, Technichal Points, TrainingAluminum fins, coil, Copper Tube

28OctOctober 28, 2025

Why Copper Tubes Are Used in Fin-and-Tube Coils

Introduction The choice of tube material in fin-and-tube coils strongly affects performance, durability, and life-cycle cost in HVAC, chillers, boilers, and heat exchangers. Copper (Cu) is one of the most common choices. Below are technical, organized reasons why copper tubes are preferred. 1. High Thermal Conductivity • Copper has very high thermal conductivity compared with many common metals (e.g., carbon steel). • High conductivity enables fast, efficient heat transfer between the fluid inside the tube and the external fins, improving overall coil heat-transfer effectiveness. •...

By پیمان داوریArticles, Technichal Points, TrainingCopper Tubes, Fin-and-Tube Coils

تأثیر فاصله فین (FPI) در کویل فین-تیوب بر راندمان حرارتی و افت فشار

30SepSeptember 30, 2025

Effect of Fins Per Inch (FPI) in Fin-Tube Coils on Thermal Efficiency and Pressure Drop

Fins per inch (FPI) is a key design parameter in fin tube coils that directly affects heat transfer performance and airside pressure drop. Increasing FPI means more fins per unit length; this change brings both benefits and trade offs. Effect on Thermal Efficiency • Increased heat transfer area: Higher FPI increases the total fin surface area in contact with air, typically raising the overall heat transfer capacity of the coil. • Improved boundary layer disruption: More fins create more frequent air–metal interfaces, which...

By پیمان داوریArticles, Technichal Points, Trainingcoil, Fin Tube, Fins Per Inch, FPI, Pressure Drop, Thermal Efficiency

07SepSeptember 7, 2025

Flow of Refrigerant and Water in a Shell-and-Tube Evaporator in a Vapor-Compression Chiller

A shell-and-tube evaporator is one of the most common heat exchanger types used in vapor-compression chillers. This article examines the refrigerant and water flows, their thermal and hydrodynamic interactions, and design and operational considerations from a mechanical engineer’s perspective. General Description and Flow Configuration A shell-and-tube evaporator typically consists of a bundle of tubes placed inside a shell. In a typical chiller, the refrigerant flows inside the tubes while the chilled water (or brine) flows in the shell; depending on design, this...

By پیمان داوریArticles, Technichal Points, TrainingCompression Chiller, Flow of Refrigerant

31AugAugust 31, 2025

Research: Oil Cooler (Copper Fin-and-Tube Coil Heat Exchanger)

Introduction An oil cooler is a device used to reduce the temperature of oil in hydraulic systems, lubricating systems, and gearboxes. One common type is the copper fin-and-tube coil heat exchanger, which is widely used because copper has high thermal conductivity and the fins provide a large heat-transfer surface. Construction and Components Shell and frame: The housing that holds the coil and connections; commonly made of steel or aluminum and designed to resist corrosion and pressure. Coil (copper tubes): Copper tubes through which oil flows (depending...

By پیمان داوریArticles, Technichal Points, TrainingCooler, Fin and Tube, Oil

28AugAugust 28, 2025

Introduction and Importance of Fin-and-Tube Coil Maintenance

Fin-and-tube coils (Fin and Tube Coils) are key components in HVAC systems, chillers, heat exchangers, and various industrial equipment. Maintaining the condition and performance of these heat-transfer assemblies requires adherence to specialized cleaning and maintenance procedures. Specialized Cleaning Procedures 1. Initial Inspection • Use high-resolution borescopes for internal visual inspection. • Assess contamination and corrosion level of aluminum fins. • Examine copper tubes for scale deposition and corrosion. 2. Preparation • Isolate power and gas supply. • Completely drain the working fluid from the system. • Install protective covers...

By پیمان داوریArticles, Technichal Points, Trainingcoil, Fin-and-Tube

26AugAugust 26, 2025

Investigation of Air Flow on Fins of Fin and Tube Coils in Condensers

Introduction

When I think about what makes a condenser truly effective, I always find myself zeroing in on those intricate fin and tube coils. They’re not just passive elements; their performance directly hinges on how air moves around them—especially across the fins. Airflow and heat exchange are tightly linked here, and getting the flow right can make a world of difference in energy savings and system reliability.

The Role of Fins and Tubes

Fin and tube coils are the...

By پیمان داوریArticles, Technichal Points, TrainingCondonsor, Fin, Fin and Tube

15AugAugust 15, 2025

Blue fin condenser coils Vs. Gold fin condenser coils

The coils play a crucial role in the efficiency of an air conditioner. such as which material to use, which condenser coil design to employ, how much these coils cost, how long they last, etc. The longevity of an air conditioner is directly related to the quality of its condenser coils. Its job is to reduce the temperature of the refrigerant as quickly as feasible. Because it is located outside, it is susceptible to deterioration and corrosion from exposure to the...

By پیمان داوریArticles, Technichal Points, TrainingBlue Fin, Fin, Fin Coil, Gold Fin