• Home
  • پیمان داوری

Author - پیمان داوری

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...

By Articles, Technichal Points, Training,
Read more...
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...

By Articles, Technichal Points, Training, , , ,
Read more...
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...

By Articles, Technichal Points, Training,
Read more...
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...

By Articles, Technichal Points, Training
Read more...
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...

By Articles, Technichal Points, Training
Read more...
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...

By Articles, Technichal Points, Training
Read more...
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...

By Articles, Technichal Points, Training,
Read more...
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 (

By Articles, Technichal Points, Training
Read more...
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...

By Articles, Technichal Points, Training
Read more...
نگهداری غذا با یخچال
03Apr

Food Refrigeration

Nowadays, refrigeration and freezing are the two most widespread methods of food preservation. Food refrigeration is a preservation process based on the reduction or maintenance of a controlled temperature for a given time and space, usually in cold rooms. This process is based on the extraction of energy from bodies with high thermal energy, thus reducing their energy, and consequently bacterial activity, in this case, in the preservation of foodstuffs. When we talk about thermal energy, we refer to the temperature of...

By Articles, Technichal Points, Training
Read more...