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Water-Cooled Condenser

The condenser is a core heat exchange device in the refrigeration system. Its function is to cool the high-temperature and high-pressure gaseous refrigerant discharged from the compressor into high-pressure liquid refrigerant through heat exchange, providing conditions for subsequent throttling and evaporative refrigeration. Different types of condensers have significant differences in working principles, performance and application scenarios based on the differences in cooling media and heat exchange methods.

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Working Principle

The core of a water-cooled condenser is the indirect heat exchange between water and refrigerant. It uses clean cooling water as the cooling medium and relies on the high thermal conductivity and large specific heat capacity of water to efficiently remove the latent heat released by refrigerant condensation (the heat released when gaseous refrigerant turns into liquid). Its specific working process is divided into three stages, and the working details of different structural types are slightly different:

• Refrigerant side circulation

The high-temperature and high-pressure gaseous refrigerant discharged from the compressor (usually at a temperature of 80-120℃ and a pressure of 1.5-5MPa depending on the type of refrigerant) enters the tube side (shell-and-tube type) or shell side (plate type, double-pipe type) of the condenser through the inlet pipeline. During the flow, the refrigerant contacts the tube wall, gradually releases heat, its temperature drops, and its state condenses from gaseous to high-pressure liquid. Finally, it flows to the throttling device (capillary tube, expansion valve) through the outlet pipeline.

• Cooling water side circulation

Driven by a water pump, cooling water (usually tap water, softened water or circulating water) enters through the cooling water inlet of the condenser and flows between the tubes (shell-and-tube type) or plates (plate type). It conducts indirect heat exchange with the refrigerant inside the tubes/plates through metal tube walls (commonly copper or stainless steel with high thermal conductivity). After absorbing the heat released by the refrigerant, the temperature of the cooling water rises (usually by 5-10℃), and then it flows to the cooling tower through the outlet pipeline. After being cooled in the cooling tower (cooled to a temperature close to the ambient wet-bulb temperature), it re-enters the condenser for cyclic operation, forming a closed-loop circulation.

• Core of heat exchange

The metal tube wall serves as the heat exchange medium. The latent heat of the refrigerant is transferred to the cooling water through the tube wall, and the cooling water takes away the heat by convection and heat conduction. Its heat exchange efficiency depends on the tube wall thickness, heat exchange area, cooling water flow rate, refrigerant flow rate and water quality cleanliness.

Product Advantages

Simplest structure and lowest initial investment

Composed only of finned coils, fans and inlet/outlet pipelines, without the need for cooling towers, water pumps, water treatment equipment and water tanks. The initial investment of the whole system is the lowest among the three types of condensers (only 1/2-1/3 of that of water-cooled type and 1/3-1/4 of that of evaporative type), suitable for scenarios with limited budgets.

No water consumption at all, suitable for water-scarce areas

No water resources are needed, and heat exchange is only dependent on air, which completely solves the water consumption problem of water-cooled and evaporative types. It is the first choice for water-scarce and arid areas (such as parts of Northwest and North China). At the same time, there is no need to consider water quality treatment and water resource pollution.

Easy installation and short construction period

The equipment is relatively compact (small units can be directly wall-mounted or floor-standing, and large units can be installed on the roof). No complex pipeline laying and supporting facility construction are required, the installation process is simple, and the construction period is short (installation and commissioning can usually be completed in 1-3 days), realizing "plug-and-play".

Minimal maintenance work and low cost

The maintenance content mainly includes two items: ① Regularly clean dust, catkins and oil stains on the fin surface (to avoid blocking the fin gaps and affecting heat exchange), usually once every 1-3 months, which can be done by high-pressure water gun flushing or vacuum cleaner cleaning; ② Check the operation status of the fan (bearings, motor) once every 6-12 months. No professional maintenance personnel are needed, and ordinary staff can complete the work with extremely low maintenance cost.

Simple anti-freezing in winter, suitable for cold areas

When the ambient temperature is below 0℃ in winter, there is no need to add antifreeze or complex anti-freezing devices because there is no circulating water in the system. It is only necessary to ensure that the refrigerant will not freeze (through compressor start-stop control or adding a small amount of antifreeze). Moreover, the lower the air temperature, the better the heat exchange effect (the lower the condensing temperature), suitable for cold northern areas (can operate normally in an environment below -20℃).

High system reliability and few faults

With a small number of components, no vulnerable parts such as water pumps and spray systems, there are few fault points, high operational stability, a service life of 10-15 years, simple fault maintenance and low maintenance cost.

Strong flexibility and flexible layout

Small units (such as household air conditioners and small water chillers) can be directly integrated into the main unit without occupying separate space; large units can be connected in parallel to adapt to different cooling capacity requirements, and the installation location (roof, wall, ground) can be flexibly selected according to the site conditions.

Core Parameters

Parameter Items	Horizontal Shell-and-Tube (Most Commonly Used)	Vertical Shell-and-Tube (for Ammonia Systems)	Plate Type Water-Cooled	Double-Pipe Type (for Small-Scale Special Use)
Core Structure	Horizontal cylinder + heat exchange tubes	Vertical shell + vertical tube bank	Stacked corrugated metal plates	Inner + outer coaxial coil
Medium Flow Direction	Refrigerant in tubes, cooling water between tubes	Refrigerant outside tubes, cooling water in tubes	Refrigerant/cooling water in separated flow channels	Refrigerant in inner tube, cooling water between tubes
Design Pressure	2.5~4.0MPa (high pressure)	1.6~3.0MPa (medium-high pressure)	1.0~2.5MPa (medium-low pressure)	1.0~2.0MPa (low pressure)
Condensing Temperature	35~40℃ (stable)	38~45℃	32~38℃	40~48℃
Cooling Water Temperature Difference	5~8℃	5~10℃	5~8℃	5~10℃
Single Unit Refrigerating Capacity	50~2000kW	30~1000kW	10~500kW	5~150kW
Application Scenarios	Large cold storage, central air conditioning	Large ammonia refrigeration cold storage	Small water chillers, cold storage	Household/small water chiller units

Technical Support and Services

• Customized design

Provide personalized product design and selection schemes according to customers' specific working conditions and requirements.

• Professional installation guidance

Provide detailed installation manuals and on-site technical support to ensure the correct installation of equipment.

• Full life cycle service

Provide regular maintenance, fault diagnosis and spare parts supply to ensure the long-term and efficient operation of equipment.

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• 20 years of in-depth development, a specialist in customized cold storage systems
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