Reversed Flow Closed Circuit Cooling Tower

I. Overview

Reversed Flow Closed Circuit Cooling Tower, named due to the opposite direction of the refrigerant and heat medium, spray water is sprayed from top to bottom, and air passes over at high speed from bottom to top.

Mainly composed of heat exchange coils, spray irrigation water system, exhaust system, and frame housing.

II. Process Workflow

The spray pump draws water from the water tank, pumps it to the upper part of the heat exchange coil, and sprays it in an umbrella shape through nozzles, covering the outer surface of the pipe material continuously and evenly, forming a thin water film. Part of the water absorbs the heat from the cooled medium inside the pipe, changing from liquid to vapor, and evaporating to carry away heat. The internal temperature of the pipe material is lowered by the cooled medium or condensed into a liquid. The water that does not evaporate falls back into the spray water tank.

Exhaust System: The top windmill of the tower is an intake type, drawing air from inside the tower and discharging it outside. Cold, dry air outside the tower is filtered through the inlet grille and enters the tower. It flows upwards from the bottom of the heat exchange coil, carrying away the evaporated water vapor, increasing the humidity and temperature of the air, which is then expelled outside by the fan.

In the spray trough, a float valve is installed. When the water level is low, it automatically replenishes the supply to ensure a consistent water level in the trough.

Electrical control systems monitor the outlet temperature of the cooled medium online and feed it back to the data processing center. Based on the temperature of the cooling medium, the system automatically controls the sprinkler water pumps and fans, as well as starts and stops them, to achieve energy-saving objectives.

Section 3: Operating Principle of Counter-Flow Closed Circuit Cooling Tower

1. Internal circulation: After the circulating water is heated by the heat source equipment and its temperature rises, it enters the surface cooler for inter-wall heat exchange. The cooled circulating water is then sent back to the heat source equipment by the pump.

2. External circulation: The spray water from the sump is delivered to the spray system, where it sprays out and comes into contact with the evaporative cooler for heat exchange. The humid steam is exhausted through the fan, and the non-vaporized spray water falls back into the sump and is then pumped back into the spray system for another cycle.

Section 4: Characteristics of Counter-Flow Closed-Circuit Cooling Towers

1. Compact Structure: Compared to crossflow towers, the product structure of the counterflow tower is more compact, offering more surface area for coil heat exchange, making it more suitable for cooling projects with smaller temperature differences and higher flow rates.

2. Complete System: Due to the smaller footprint of the cooling tower, combined with the circulation pump, it can be made into an integrated unit for easy mobility.

3. Application Range: Due to the compact tower design, it is suitable for placement in workshops, making it particularly well-suited for medium-frequency power supply cooling and mechanical water jacket cooling. It is especially applicable to projects with smaller temperature differences, such as the cooling of a group of water source heat pump units.

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