بایگانی‌ها Articles

23FebFebruary 23, 2025

Cold rooms according to their size

Panels, floors and roofs, usually made of sandwich panels. The sandwich panel is composed of two steel sheets protecting an insulating core of high density polyurethane. This panel is responsible for the most efficient and durable cooling of the cold room. Airtight door. It can be sliding or pivoting, and incorporate an air curtain, or louvres to mitigate cold losses with each door opening. Humidifiers or dehumidifiers. These allow humidity (relative humidity) to be added to or removed from the cold room in such...

By پیمان داوریArticles, Technichal Points, TrainingCold rooms

21FebFebruary 21, 2025

Cold rooms Definition

Cold rooms are spaces where, thanks to a refrigeration system that establishes certain climatic conditions, the conservation or manufacturing process of different products is favored. They are a fundamental element in many sectors. From the food and HORECA sector for the correct preservation of food, to the industrial sector for production processes where refrigeration is involved. For example, in a vehicle test tunnel, where a cold room simulates certain climatic conditions, or in the manufacturing process of medicines such as insulin. Cold rooms can...

By پیمان داوریArticles, Technichal Points, TrainingCold rooms

16FebFebruary 16, 2025

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...

By پیمان داوریArticles, Technichal Points, Trainingspiral finned tubes

14FebFebruary 14, 2025

What is a Unit Heater

What is a Unit Heater? • A unit heater is a heating device used to warm specific spaces such as garages, workshops, or warehouses. • These heaters are especially useful in locations where traditional heating systems may not reach, or where their implementation is not practical. Features and Applications • Price of Unit Heaters: The price of unit heaters varies depending on the type, size, and capabilities of the device. • Structure and Function: This device is a small box that contains a heating system...

By administratorArticles, Technichal Points, TrainingUnit Heater

09FebFebruary 9, 2025

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...

By پیمان داوریArticles, Technichal Points, Training1. Chiller and Fan Coil, Air Conditioning Systems, Chiller and Air Handler System, Duct Split System, refrigeration cycle

04FebFebruary 4, 2025

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...

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

27JanJanuary 27, 2025

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...

By پیمان داوریArticles, Technichal Points, TrainingCopper Tubes

20JanJanuary 20, 2025

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".

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By پیمان داوریArticles, Technichal Points, TrainingCFM

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

18JanJanuary 18, 2025

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.

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By پیمان داوریArticles, Technichal Points, Trainingcoil, Fin Tube, U-Bend

روش‌های جلوگیری از خوردگی در کویل‌های فین-تیوب

18JanJanuary 18, 2025

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...

By پیمان داوریArticles, Technichal Points, Trainingcoil, Corrosion, Fin Tube