Combined wet and dry closed cooling tower

Combined wet and dry closed cooling tower

Dry-wet combined closed-circuit cooling tower, also known as dry-wet combined or dry-wet mixed closed-circuit cooling tower, uses a combination of dry and wet coils. It combines the advantages of both heat transfer methods. The dry coil utilizes the advantage of lower ambient air temperature to reduce the temperature of the medium to near the dry-bulb temperature, consuming only the kinetic energy required to drive airflow and no water. The wet coil reduces the medium temperature to near the wet-bulb temperature, compensating for the dry coil's inability to reach the wet-bulb temperature. Therefore, it can save a large amount of water resources and is favored by users.

Key words:

Classification:

Dry and Wet Combined Cooling Tower

Hotline:

Combined wet and dry closed cooling tower

Overview

A dry-wet combined closed-circuit cooling tower, also known as a dry-wet combined or dry-wet hybrid closed-circuit cooling tower, uses a combination of dry and wet coils. It combines the advantages of both heat transfer methods. The dry coil utilizes the lower ambient temperature to reduce the temperature of the medium above the dry-bulb temperature to near the dry-bulb temperature, consuming only the kinetic energy required to drive the airflow and no water. The wet coil reduces the medium temperature to near the wet-bulb temperature, compensating for the inability of the dry coil to reach the wet-bulb temperature. Therefore, it can save a large amount of water resources and is favored by users.

Working Process

► Heat from the production process equipment is transferred to the circulating medium. The high-temperature medium enters the dry-wet combined closed-circuit cooling tower through closed pipes.

► The high-temperature medium enters the dry cooling coil, and heat is transferred from the base tube to the fin, where it is exchanged with the high-speed airflow through convection, taking away heat energy and lowering the temperature.

► The cooled medium then enters the wet coil, where the sprayed water evaporates, condenses, and absorbs heat, further lowering the temperature, to a greater extent than the dry coil, but this requires the consumption of spray water.

► After the circulating medium is cooled to meet the process requirements by the dry and wet coils, it is returned to the production equipment in a closed loop, transferring heat again in a continuous cycle.

Product Advantages

► Dry coil: Zero water consumption, no fouling outside the pipe, direct high-temperature reduction. It fully utilizes the low ambient temperature of the project location, using air to reduce the temperature of the high-temperature medium by about 2-4 degrees, with completely zero water consumption.

► Wet type: High efficiency, large temperature difference, low investment. It reduces the circulating medium to the temperature required by the production process, reducing the investment in dry coils.

Application Scenarios

► Northwest region: Water-scarce and arid areas, reducing water consumption and lowering operating costs;

► Regions with abundant electricity: Since the dry operation requires a large amount of air, the fan motor power is also relatively large, resulting in high energy consumption. It is more suitable for regions with abundant wind, hydro, tidal, and nuclear power.

Case Studies

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