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finned tube
16Feb

Performance study of spiral finned tubes on heat transfer

The study titled "Performance study of spiral finned tubes on heat transfer and wake flow structure," published in the International Journal of Heat and Mass Transfer, investigates the turbulent flow and heat transfer characteristics of heat exchangers utilizing spiral finned tubes (SFT). The research employs large eddy simulation (LES) to analyze the flow dynamics and temperature distribution around these tubes, aiming to enhance the understanding of how vortex structures influence heat transfer efficiency. Objectives and Methodology The primary objective of the...

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Types of Air Conditioning Systems
09Feb

Introduction to Types of Air Conditioning Systems

Introduction to Types of Air Conditioning Systems Introduction • Importance of Air Conditioning Systems: o Widespread and essential use in buildings o Objective: To provide optimal temperature and humidity for human comfort o Emergence of various types of systems for specific environments Description of Air Conditioning Systems 1. Chiller and Fan Coil  System Composition:  Comprises a chiller and multiple fan coils for ventilating different areas  Method of Operation:  The chiller cools water, which is then supplied to the fan coils.  Heat is extracted from the air, and warm water...

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The Impact of Internal Grooves in Copper Tubes on Heat Transfer in Fin-Tube Coils
04Feb

The Impact of Internal Grooves in Copper Tubes on Heat Transfer in Fin-Tube Coils

<p> Introduction Heat transfer plays a crucial role in thermal and cooling systems. Copper tubes used in fin-tube coils are highly favored due to copper's superior heat transfer properties. However, the design and physical characteristics of these tubes, particularly their internal grooves, can significantly affect their efficiency. Internal Grooves in Tubes Internal grooves in tubes can take the form of longitudinal or circular indentations. These grooves increase the contact surface area between the fluid and the tube wall, subsequently enhancing heat transfer. By...

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تعریف لوله مسی
27Jan

Definition of Copper Pipe

1. Definition of Copper Pipe • Definition: A copper pipe is a type of pipe made from copper, which is used in industrial and domestic applications due to its physical and chemical properties. • Features: o High resistance to corrosion o Excellent heat transfer o Long durability o Flexibility for easy installation o Hygienic properties and reduction of bacterial growth in drinking water 2. Technical Specifications of Copper Pipes • Raw Materials: High-purity copper (99.9%). • Dimensions and Standards: o Outside diameter: 4 to 100 mm o Wall thickness: 0.5 to 5...

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CFM
20Jan

Definition of CFM

1. Definition of CFM

What is CFM? Basic explanations about CFM and its importance in mechanical engineering and refrigeration systems.

2. Concept of Flow Rate

What is meant by flow rate? Description of flow rate and its relationship to the amount of air passing through a unit of time.

3. Applications of CFM

Use of CFM in different devices: Examples of devices (fan-coils, air handling units, duct split systems) and their airflow rates.

4. What does CFM stand for?

Explanation of the abbreviation: Definition of CFM as "Cubic Feet Per Minute".

5....

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تأثیر عیوب خم 180 درجه (استاندارد، چین‌خوردگی و دوپهــــن‌شدگی) در ناحیه یو بر عملکرد کویل فین-تیوب
18Jan

Impact of 180° U-Bend Defects on the Performance of Fin-Tube Coils

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Overview

In fin-tube heat exchangers, the 180° U-bend region plays a critical role in fluid distribution, heat transfer, and pressure drop. When the bend is manufactured correctly—with proper curvature, constant internal diameter, and smooth internal surface—the flow field and thermal performance remain close to design values. However, two common manufacturing defects in the U-bend can severely degrade performance: local corrugation and local flattening. This document provides a technical assessment of all three conditions.

1....

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روش‌های جلوگیری از خوردگی در کویل‌های فین-تیوب
18Jan

Corrosion in Fin–Tube Coils and Methods for Preventing It

Fin–tube coils, which typically combine aluminum fins with copper tubes, are widely used in air-conditioning and HVAC systems. Corrosion in these components leads to reduced heat-transfer performance, efficiency loss, leakage, and shortened service life. The following sections present practical, preventive engineering methods for protecting these coils.

Material Selection and Proper Design

Corrosion-Resistant Alloys

Selecting aluminum and copper alloys with inherently high corrosion resistance—such as surface-treated aluminum alloys or copper alloys with controlled alloying elements—forms the foundational approach to durability...

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سایزینگ کلکتور ورودی و خروجی کویل فین-تیوب آبی — راهنمای فنی و دقیق
18Jan

Technical Guide for Sizing Inlet and Outlet Manifolds of Water-Fin–Tube Coils

General Principles

Primary Objective:To ensure uniform water distribution across all tube circuits, minimize pressure drop, and prevent cavitation and noise. Key Parameters:Total system mass flow rate m˙\dot{m}m˙, number of tube rows NtN_tNt​, internal tube diameter dtd_tdt​, effective coil length LLL, desired velocity in each tube, and allowable total pressure drop in the manifolds.

Fundamental Calculations

1. Determining Total Flow Rate

Use the coil heat load QQQ and water temperature difference ΔT\Delta TΔT: m˙=QcpΔT\dot{m} = \frac{Q}{c_p \Delta T}m˙=cp​ΔTQ​ where cpc_pcp​, the specific...

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Different Types of Fin Tubes
12Jan

Different Types of Fin Tubes Based on Design

There are various types of fin tubes available for heat transfer applications, each uniquely designed with specific dependencies. Each type of fin tube has its advantages and disadvantages in specific applications to be used in the most suitable conditions. Different Types of Fin Tubes Based on Type of Fin Fin Plate Wrap-on Fin Extruded Fin Fin Plates The plate heat exchanger is a type of heat exchanger that uses plates to transfer heat between fluids. In most cases, the plate fin is categorized as a compact...

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راندمان و ظرفیت کویل‌ها - بخش دوم
31Dec

Efficiency and Capacity of Coils – Part two

1. Introduction A brief introduction about the impact of system changes on coil performance and the importance of adjusting operational conditions. 2. System Changes Affecting the Inefficiency of Coils • The impact of temperature and fluid and air volume on coil performance. • The following aspects are specifically mentioned: • Fluid Temperature: o If the temperature is higher or lower than the specified amount, the coil’s performance is disrupted. • Air Temperature: o Similarly, if the incoming air temperature is not suitable, it negatively affects

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