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Author - پیمان داوری

بهینه‌سازی سیکل تبرید با بهبود عملکرد کندانسور در طراحی و ساخت کندانسور
15Jul

Optimization of Refrigeration Cycle by Enhancing Condenser Performance in the Design and Construction of Coil Fin and Tube Condensers

Introduction The condenser is a critical component in the refrigeration cycle, playing a vital role in heat exchange between the refrigerant fluid and the ambient environment. Optimizing condenser performance directly leads to increased system efficiency, reduced energy consumption, and extended equipment life. Particularly for coil fin and tube condensers—widely used in various industries due to their extensive surface area and effective heat transfer characteristics—improving design and operation is paramount. This article examines the key factors and methods affecting condenser performance and...

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Technical Study on the Use of Copper and Aluminum as Materials in Coil Fins and Tubes and Their Advantages Compared to Other Metals
10Jul

Technical Study on the Use of Copper and Aluminum as Materials in Coil Fins and Tubes and Their Advantages Compared to Other Metals

Introduction Coil fins and tubes are essential components in heat exchange systems used in HVAC equipment, chillers, unit heaters, and other thermal systems. The choice of material for manufacturing tubes and fins directly impacts heat transfer efficiency, overall system weight, corrosion resistance, and total cost. This article explores the technical reasons behind the use of copper for tubes and aluminum for fins, along with their advantages and comparisons to other metals. 1. Thermal and Mechanical Properties of Copper • High Thermal Conductivity: Copper...

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Air Washer in Industrial Warehouse ایر واشر صنعتی
07Jul

Air Washer in Industrial Warehouse HVAC: An Effective Cooling Solution

In industrial environments such as warehouses, HVAC (heating, ventilation, and air conditioning) plays a crucial role in maintaining a comfortable and safe working atmosphere. Due to the large space and high volume of air circulation, conventional cooling systems can be inefficient and costly. In this context, the air washer emerges as a specialized and cost-effective solution for cooling and air cleaning in industrial warehouses. This article reviews the structure, operation, and benefits of air washers in cooling warehouse air. Structure and...

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دستگاه زنت
11Jun

Zent

The Zent air conditioning unit is an innovative HVAC system designed to provide comfortable indoor air conditions under varying climatic scenarios. Utilizing evaporative cooling through a cellulose pad in the summer and a finned-tube hot water coil for winter heating, this device efficiently meets both cooling and heating demands with low energy consumption. Structure and Function of the Cellulose Pad in Summer Cooling One of the key components of the Zent unit is the cellulose pad, which serves as the core of...

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پروسه اسیدشویی کندانسور پوسته‌لوله با تیوب‌های مسی و پوسته کربن استیل در چیلرهای آب‌خنک تراکمی
01Jun

Acid Cleaning Process for Shell-and-Tube Condensers with Copper Tubes and Carbon Steel Shells in Water-Cooled Reciprocating Chillers

Introduction Shell-and-tube condensers play a critical role in heat exchange and refrigerant condensation in water-cooled reciprocating chillers. Typically, their tubes are made of copper and the shell is made of carbon steel. Over time, deposits, corrosion products, and sludge accumulate inside the tubes, reducing heat transfer efficiency. Acid cleaning is an effective method to remove these fouling materials and restore performance. This article outlines a complete and technical step-by-step procedure for acid cleaning such condensers. Materials and Equipment Required Suitable acid (commonly diluted...

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میانگین دمای لگاریتمی
18May

Logarithmic Mean Temperature Difference

1. Definition of Logarithmic Mean Temperature Difference (LMTD)

The logarithmic mean temperature difference is not an arithmetic average but a logarithmic one, used to calculate the temperature difference between two fluid streams in a heat exchanger where temperatures gradually change. The general formula is: ΔT1= temperature difference at the beginning of the path (e.g., hot fluid temperature minus cold fluid temperature at the inlet) ΔT2​ = temperature difference at the end of the path (e.g., hot fluid temperature minus cold fluid temperature at the outlet) ln...

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hvac
04May

HVAC

HVAC stands for heating, ventilation, and air conditioning. The system is generally used in buildings or homes to control the indoor climate by regulating the temperature, humidity, and air quality. The aim of HVAC systems is to provide a comfortable and healthy living space for the occupants. An efficient HVAC system will not only provide comfortable conditions but can also reduce utility bills and improve indoor air quality. The heating component of an HVAC system involves various types of heating...

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کندانسور اتاق سرد
24Apr

The refrigerant condenser

In the refrigeration cycle, the refrigerant releases its heat in the condenser. Different designs and systems are used in everyday life. The refrigerant condenser is an important component in refrigeration and air conditioning systems. Its main task is to transfer the heat absorbed by the system to its surroundings. The condenser adjusts and regulates the condensation pressure in the refrigeration cycle. Depending on how much or how little heat is released to the surroundings, the condensation pressure of the refrigeration and...

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Selection process of a refrigeration evaporator
21Apr

Everything you need to know about refrigeration evaporators Part 2

Selection process of a refrigeration evaporator

For a correct selection of a refrigeration evaporator, we must consider a series of factors such as the cooling load required by our refrigeration equipment, the relative humidity, the range, and the air speed required. In addition, we will have to pay attention to other factors such as the thermal jump, i.e., the temperature difference between the inside of the chamber and the refrigerant used. It is essential to find a balance in the thermal...

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سیستم‌های تبرید مستقیم و غیرمستقیم
13Apr

Direct and indirect cooling systems

Refrigeration systems have more than one application, such as food preservation, equipment cooling, etc. It extracts heat from one environment and transfers it to another, thus cooling it first. We have a wide variety of refrigeration systems, all of them different, which gives us the possibility to choose the cooling system that best suits our needs, what we are looking for. In order to know which is the best in each situation, we must define them at various levels, and identify their...

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