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آسایش حرارتی
15Dec

Thermal Comfort – part 1

Thermal Comfort in Modern Architecture Thermal comfort has become one of the important and controversial topics in today's architecture. Before designing and constructing any space, one of the main priorities is to determine and estimate the thermal comfort range of users. Factors Influencing Thermal Comfort Climatic Changes: Changes in climate have a major impact on human thermal comfort. Human Reactions: Humans react differently to climatic changes. Technology and Optimization With advances in technology, humanity has strived to optimize climatic conditions and create the best possible living environment. Importance of...

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Types of Condensers انواع کندانسور
11Dec

Types of Condensers

Main Concept: Condensers operate based on the principles of heat transfer, which involves the movement of heat from warmer environments to cooler ones. The functioning of a condenser involves three basic phases: Phase One: Desuperheating In this phase, the highly heated and pressurized refrigerant vapor entering the condenser first loses its heat. This process aids in the initial cooling of the refrigerant. Phase Two: Condensation Once sufficient heat has been removed from the refrigerant vapor, the condensation process begins. In this...

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Refrigerants
08Dec

Differences Between Refrigerants R22 and R410

Refrigerants R22 and R410 are two types of gases commonly used in air conditioning systems. These two gases are compared due to their different characteristics and environmental impacts. Below, we will examine the key differences between these two gases.

1. Environmental Status

R22: It is a hydrochlorofluorocarbon (HCFC) that harms the ozone layer. For this reason, its production and use have been banned in many countries. R410: It is a hydrofluorocarbon (HFC) introduced as a more environmentally friendly alternative to R22 and has...

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coil cleaning
03Dec

How to clean or replace fan coil units

Cleaning and replacing fan coils are essential maintenance tasks that help ensure the efficiency and effectiveness of heating and cooling systems. Below are the steps and key tips for cleaning or replacing coils: 1. Required Equipment • Gloves and mask: To prevent contact with contaminants. • Soft brush or special brush: For removing dust. • Dust blower or compressed air: To blow dust out from between the fins. • Cleaning solution: For washing and cleaning the coils. • Dustpan: To collect debris. • Vacuum cleaner: If needed,...

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Chiller Tonnage تناژ چیلر
01Dec

Chiller Tonnage A Guide to Selecting the Appropriate Tonnage for Various Projects

Choosing a chiller with the wrong tonnage can have serious consequences, including inadequate cooling and resident dissatisfaction, significant increases in energy consumption and monthly expenses, reduced lifespan of the equipment, and problems with chiller maintenance, which can lead to premature device failure. Therefore, selecting a chiller with the appropriate tonnage for each project is crucial. In this section, we will examine the factors that influence chiller tonnage selection and the methods for calculating it. Factors Influencing Chiller Tonnage Selection 1. Thermal Load...

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Key Points for Maintaining Chiller Evaporators
26Nov

Key Points for Maintaining Chiller Evaporators

1. Installation of Strainer in the Water Inlet to the Chiller Evaporator Installing a strainer in the water inlet to the chiller evaporator is essential and offers numerous benefits: • Prevention of Suspended Particle Ingress: The chiller evaporator, being a sensitive component of the heat exchange system, is susceptible to damage from particles like sand, rust, and debris. These particles can reduce heat transfer efficiency and cause blockages in the system. • Difficulty in Cleaning After Contamination: Once contaminants enter, cleaning the evaporator can be...

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Refrigerant Replacement Table
21Nov

Refrigerant Replacement Table

<p> The refrigerant replacement table is a key tool for professionals in the HVAC and refrigeration industry. This table helps experts identify old refrigerants and select more environmentally friendly alternatives. Typically, these tables provide important information, including the type of old refrigerant, the replacement refrigerant, and key characteristics pertaining to both. Reasons for Using the Refrigerant Replacement Table Environmental Issues Many old refrigerants, such as CFCs and HCFCs, are gradually being phased out due to their harmful effects on the ozone layer and their...

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Sight galss سایت گلس
07Nov

Sight Glass

Definition of Sight Glass A sight glass is a transparent tube that allows users to observe the fluid flowing through it. This device is used for analyzing conditions in industrial equipment and chemical reactors. Materials and Features Sight glasses are usually made of very durable glass that does not get damaged under specific conditions. The glass is strengthened through a thermal process, and an additional protective coating is applied to guard against chemical substances. These features make the glass resistant to stress, reducing the likelihood...

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شیر انبساط Expansion Valve
30Oct

Expansion Valve

Radairan Company is one of the pioneers in the field of equipment and HVAC systems, engaged in the examination and production of diverse products in this area. In equipment that operates based on the refrigeration cycle, important processes take place, each performed by specific components such as evaporators, condensers, compressors, or expansion valves. One of these key processes, as mentioned, is carried out by the expansion valve, which is the topic of this article. Stay with us at Radairan Company  to...

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Accumulator Heat Exchanger آکومولاتور هیت اکسچنجر
29Oct

Accumulator Heat Exchanger in Chillers

Radiran Company, through extensive research and effort in the field of refrigeration systems, has identified the significance of accumulators equipped with heat exchangers. These accumulators play a vital role in chiller units. By directing the liquid refrigerant to the heat exchanger of the accumulator, there is a considerable increase in the efficiency of the refrigeration cycle. This process not only moves the liquid refrigerant to the subcooling area but also provides the necessary heat for its evaporation. The result of...

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