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Oasis Iceberg
11
2024
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07
What are the types of air-cooled condensers, and what are their advantages and disadvantages?
The air-cooled condenser is a heat-exchange device used for cooling cold storage facilities, composed of components such as a fan, fan coil unit, heat exchange fins, and a cabinet. Primarily, the heat-exchange configurations are divided into counterflow and parallel-flow types. In the counterflow type, the air intake vents are all located at the lower section, drawing air in, and this design typically offers a larger heat transfer area compared to the parallel-flow type.
The air-cooled condenser is a heat-exchange device used for cooling cold storage facilities, composed of components such as a fan, fan coil unit, heat exchange fins, and a cabinet.
Primarily, heat exchange methods are categorized into counterflow and parallel flow. In counterflow systems, the air inlets are entirely located at the lower ventilation windows to draw in air, and the heat exchange area is typically larger than that of parallel-flow systems.
In the counterflow type, air is drawn in from one side at the top and another side at the bottom, with the heat exchange tubes arranged closely together, creating a full spray of water flow.
It evolved relatively early from a water-cooling system, and the equipment still features cooling-water packing—essentially making it a shell-and-tube condenser equipped with a circulating water pump and cooling devices.
Integrated assembly of the water tower.
The fully evaporative condenser, which operates in a counterflow design, is more efficient in terms of water and energy conservation. The air-cooled evaporative condenser builds upon the fully evaporative model by incorporating an improvement: the refrigerant first enters the air-cooled heat exchange section, and then flows into the spray-evaporation section. This optimized arrangement significantly lowers the temperature during the spray-based cooling process.
It can reach 60°C, effectively reducing the phenomenon of high-temperature evaporation and scaling. This represents a scientifically sound improvement. Additionally, depending on the type of heat exchange tube, it is categorized into several varieties.
Heat exchange tube types include: stainless steel tubes (for corrosive gases), fertilizer-grade tubes (high pressure), carbon steel hot-dip galvanized tubes (standard), and aluminum alloy tubes (with superior heat transfer performance).
Copper pipes (primarily used for water cooling), and oxygen-free copper pipes (environmentally friendly, less likely to cause secondary pollution, and capable of withstanding high instantaneous water pressure).
Pipes are further categorized into round pipes, elliptical pipes, and more—some claim that elliptical pipes can help reduce dry spots, but in reality, the effect isn't significant.
Advantages of Air-Cooled Condensers
The system has low operating costs.
Maintaining the condensing temperature within 8.3°C of the wet-bulb design temperature is both practical and cost-effective, resulting in compressor power consumption that is at least 10% lower compared to other cooling tower/condenser systems.
Moreover, it saves 30% of power consumption compared to air-cooled condenser systems, with the fan's power output being comparable to that consumed by the fans in cooling tower/condenser systems.
And it consumes about one-third the power of an air-cooled condenser fan with similar specifications. This is due to the pump's lower head and reduced water flow.
The pump's power is approximately 25% of the pump power required in a typical cooling tower/condenser system.
Save space
The air-cooled condenser saves valuable space by integrating the condenser coil and cooling tower into a single unit, and there’s no need to connect to a separate cooling tower/condenser.
The system requires a larger pump and piping. In contrast, an air-cooled condenser needs only about 50% of the frontal area required by a similarly sized water-cooled condenser.
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