Monthly Archives - August 2026

Difference Between R22 and R410A Refrigerants
24Aug

Difference Between R22 and R410A Refrigerants

R22 and R410A are two widely used refrigerants in air-conditioning and cooling systems, but they differ significantly in chemical composition, performance, and environmental impact. R22 is the chemical name for chlorodifluoromethane and belongs to the HCFC family. It was widely used for years in air conditioners, chillers, and refrigeration systems because of its good heat-transfer performance and relatively easy maintenance. However, R22 contains chlorine, which damages the ozone layer, so its production and use have been restricted or phased out in...

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مبدل پوسته‌ و لوله‌ کندانسور آبی
18Aug

water-cooled condenser

In a shell-and-tube type water-cooled condenser used in a vapor-compression chiller, the use of 3/4-inch copper tubes with external fins is a thermal and economic choice. Although the refrigerant flows on the shell side and cooling water flows inside the copper tubes, the external surface of the tubes still plays an important role in improving heat transfer efficiency. The main reason is that the heat transfer coefficient on the refrigerant side, especially during condensation, is relatively low and must be...

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سرعت استاندارد آب در یک کویل فین‌تیوب مسی
11Aug

Standard Water Velocity in a Copper Fin-Tube Coil

The standard water velocity in a copper fin-tube coil is selected to maintain a balance between heat transfer performance, pressure drop, noise level, and equipment durability. If the water velocity is too low, the flow inside the tube becomes weak and the heat transfer coefficient drops. In this condition, the water spends more time in the coil, but the internal mixing is insufficient, so heat is not transferred effectively. As a result, the coil cannot reach its expected thermal capacity, and...

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پروسه کندانس مبرد در کندانسور - کویل فین تیوب
09Aug

The Process of Refrigerant Condensation in a Condenser – Fin-and-Tube Coil

Refrigerant condensation in a fin-and-tube coil condenser is one of the main stages in the refrigeration and air-conditioning cycle. In this section, the refrigerant leaves the compressor as high-pressure, high-temperature superheated vapor and enters the condenser, where it must release its heat to the surrounding environment and change into liquid. This process is essential for the operation of any cooling system. First, the hot vapor refrigerant enters the tubes of the coil, which are usually made of copper or aluminum. Because...

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جوشش مبرد
04Aug

Boiling of Refrigerant in the Evaporator – Fin-and-Tube Coil

The evaporator is one of the most important components of the refrigeration cycle, and its main job is to absorb heat from the surrounding environment and convert the refrigerant from liquid to vapor. In a fin-and-tube coil, the refrigerant flows inside the tubes while air passes over the fins. The fins increase the heat-transfer surface area, allowing heat to move from the air to the refrigerant more efficiently. As a result, the temperature of the surrounding environment drops. Boiling begins when...

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