Dry-Wet Combined Closed Cooling Tower

A dry–wet combined closed-circuit cooling tower, often simply referred to as a “dry–wet” or “dry–wet hybrid” system, integrates both dry and wet heat-exchange coils to leverage the advantages of each. The dry coil takes advantage of lower ambient temperatures to reduce the temperature of the process fluid to near the dry-bulb temperature, consuming only the kinetic energy required to drive air flow and incurring no water consumption. Meanwhile, the wet coil further cools the fluid to a temperature close to the wet-bulb temperature, thereby compensating for the dry coil’s limitation in achieving wet-bulb temperatures. As a result, this design significantly conserves water resources and has gained widespread favor among users.

Key words:

Classification:

Dry and Wet Combined Cooling Tower

Hotline:

Dry-Wet Combined Closed Cooling Tower

Overview

A dry–wet combined closed-circuit cooling tower, often referred to as a dry–wet hybrid or dry–wet integrated closed-circuit cooling tower, employs a hybrid design that integrates dry and wet heat-exchange coils. This configuration leverages the advantages of both heat-transfer mechanisms: the dry coil takes advantage of lower ambient temperatures to reduce the temperature of the process fluid to near the dry-bulb temperature, consuming only the kinetic energy required to drive air flow and incurring no water consumption; the wet coil further cools the fluid to a temperature close to the wet-bulb temperature, thereby compensating for the dry coil’s limitation in achieving wet-bulb temperatures. As a result, this design significantly conserves water resources and has gained widespread favor among users.

Work Process

► Heat generated by production process equipment is transferred to the circulating medium, which, as a high-temperature fluid, flows through closed pipelines into a combined dry–wet closed cooling tower.

► High-temperature process fluid enters the dry-cooling coil, where heat is transferred from the base tube to the fins. The high-velocity air flowing over the fins then undergoes convective heat exchange, carrying away the thermal energy and reducing the fluid temperature.

► The cooled medium then enters the wet coil, where spray water evaporates and condenses, absorbing heat and further reducing the temperature—often to a greater extent than with a dry coil—though this process requires the consumption of spray water.

► The circulating medium is cooled through dry and wet coils to meet process requirements, then returned in a closed loop to the production equipment to carry heat again, repeating the cycle continuously.

Product Advantages

► Dry coil: zero water consumption, no fouling on the tube exterior, and a direct reduction in high-temperature supply. By fully leveraging the project’s local low-temperature conditions, ambient air is used to cool the high-temperature medium by approximately 2–4°C, achieving completely zero water consumption.

► Wet type: high efficiency, large temperature difference, and low investment; it cools the circulating medium to the process-specific target temperature, thereby reducing the capital expenditure on dry coil systems.

Application Scenarios

► Northwest Region: In water-scarce, arid areas, reducing water consumption can also lower branch operating costs.

► Areas with abundant electricity supply: Because dry-operation mode requires a large air volume and relatively high fan motor power, resulting in significant energy consumption, it is particularly suitable for regions where wind, hydro, tidal, and nuclear power are readily available.

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