Yearly Archives - 2025

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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وظیفه قطره‌گیرها در برج خنک‌کن
21May

The Role of Drift Eliminators in Cooling Towers

Reducing the Amount of Water Droplets Carried with the Exhaust Air (Drift Reduction) The primary function of drift eliminators is to prevent small water droplets from escaping the cooling tower along with the airflow. Water droplets suspended in the air stream (drift) can cause environmental problems (pollution of surrounding soil and water) and water loss in the system. Drift eliminators collect and separate these droplets, minimizing water loss. Environmental Protection and Water Conservation By reducing the amount of suspended...

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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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Everything you need to know about refrigeration evaporators
15Apr

Everything you need to know about refrigeration evaporators Part 1

Refrigeration evaporators play a fundamental role in any refrigeration or freezing system, whether incorporated in a compact system or as a stand-alone unit. But do you really know what an evaporator is or how it works? What is a refrigeration evaporator and what is it used for? In refrigeration, an evaporator is the heat exchanger where the refrigerant circulating inside the refrigeration circuit absorbs the thermal energy from the environment, which is then cooled. This is how the state of the refrigerant...

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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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Other food preservation processes
08Apr

Other food preservation processes

In addition, there are other types of preservation processes which, although with different qualities, also aim to preserve the optimum conditions for food consumption, among which the following stand out: • Ultra-freezing: consists of subjecting food to temperatures below -40ºC for relatively short periods of time (

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The importance of refrigeration in food
06Apr

The importance of refrigeration in food

Most of the foodstuffs consumed daily nowadays need to be refrigerated because they are perishable (meat, fish, fruit, vegetables, etc.). For this reason, it is essential to guarantee their safety for as long as possible, thus avoiding possible health problems. What is the importance of refrigerating food? It has been proven that refrigeration of food at an optimum temperature plays a fundamental role in maintaining food safety. In many cases it is necessary to control and maintain the storage temperature, which will...

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