Counterflow Closed Circuit Cooling Tower

I. Overview

Counter-current closed cooling tower, named due to the opposite direction of cold and hot media, with spray water flowing from top to bottom and air passing through at high speed from bottom to top. Mainly composed of heat exchange coils, spray water system, exhaust system, and frame shell.

II. Process Workflow

The spray pump draws water from the sump and pumps it to the upper part of the heat exchange coil, where it is sprayed in an umbrella-like pattern by nozzles, covering the external surface of the pipes uniformly and continuously, forming a thin water film. Part of the water absorbs the heat from the cooled medium inside the pipes, turning from liquid to vapor, which evaporates and carries away heat. The cooled medium inside the pipes is either cooled down or condensed into a liquid. The water that does not evaporate falls back into the spray water sump.

  Exhaust System: The top fan of the tower is an intake type, drawing air from inside the tower and exhausting it outside. Cold and dry air outside the tower enters the tower through the intake grate after filtering out debris. It flows upward 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 exhausted outside by the fan.

In the sprinkler sump, a float valve is installed. When the water level is low, it automatically replenishes the supply to maintain a consistent water level in the sump.

Electrical control, online monitoring of the cooled medium's outlet temperature, feedback to the data processing center, and automatic control of the spray pump and fan operation based on the cooled medium temperature, to achieve energy-saving goals.

Section 3: Operation Principle of Counter-Flow Closed-Circuit Cooling Towers

1. Internal circulation: After the recirculating water is heated by the heat source equipment, it enters the surface cooler, where it undergoes interwall heat exchange. The cooled recirculating water is then pumped back to the heat source equipment.

2. External Circulation: Water from the tray is supplied to the spray system, where it sprays out and comes into contact with the surface cooler for evaporation and heat exchange. The moist steam is then exhausted through the fan, while the un-evaporated water falls back into the tray and is pumped back into the spray system by the pump 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 countercurrent tower is more compact, featuring more coil surface area for heat dissipation, making it more suitable for cooling projects with smaller temperature differences and higher flow rates.

2. Overall 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 Scope: Due to its compact tower design, it can be placed in workshops, making it particularly suitable for cooling medium-frequency power supplies and mechanical water jackets. It is especially well-suited for projects with smaller temperature differences, such as the cooling of a group of water source heat pump units.

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