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WL 320

- Principle and characteristic variables of a wet cooling tower with forced ventilation
- Transparent, easily interchangeable cooling column with wet deck surface
- 4 additional cooling columns available as accessory


Technical Description

Wet cooling towers are a proven method of closed-circuit cooling and heat dissipation. Typical areas of application are: air conditioning, heavy industry and power plants. 

In wet cooling towers the water to be cooled is sprayed over a wet deck surface. Water and air come into direct contact in the counterflow. The water is cooled by convection. Some of the water evaporates and the evaporation heat removed further cools down the water.

WL 320 examines the main components and principle of a wet cooling tower with forced ventilation. Water is heated in a tank and transported by a pump to an atomiser. The atomiser sprays the water to be cooled over the wet deck surface. The water trickles from the top to the bottom along the wet deck surface whilst air flows from the bottom to the top. The heat is transferred directly from the water to the air by convection and evaporation. The evaporated water volume is recorded. The air flow is generated by a fan and adjusted using a throttle valve.

The cooling column is transparent allowing clear observation of the wet deck surface and the trickling water. Interchangeable cooling columns (WL 320.01 - WL 320.04) enable comparative studies.

All important process parameters are recorded (volumetric air flow rate, temperatures of air and water, air humidity, water flow rate). The measured values can be read on digital displays. At the same time, the measured values can also be transmitted directly to a PC via USB. The data acquisition software is included. The changes of state of the air are represented in an h-x diagram.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- thermodynamic principles of the wet cooling tower
- changes of state of the air in the h-x diagram
- determination of the cooling capacity
- energy balances
- calculation of process parameters, such as maximum cooling distance, cooling zone width etc.
In conjunction with the cooling columns

WL 320.01-WL 320.04
- comparison of different wet deck surfaces


[1] principle of a wet cooling tower with cooling column and forced ventilation
[2] interchangeable cooling columns with different wet deck surfaces available as accessories 
[3] water circuit with pump, filter, valve and a nozzle as atomiser
[4] three-stage heater with thermostat for water heating
[5] radial fan for forced ventilation
[6] throttle valve to adjust the air flow
[7] demister unit at the outlet of the cooling columns minimises water loss
[8] tank for additional water compensates for water loss
[9] display of temperature, differential pressure, flow rate and humidity 
[10] GUNT software for data acquisition via USB under Windows Vista or Windows 7

Technical Data

Cooling column
- specific surface of the wet deck surface: 110m²/m³
- cross-section: 150x150mm
Volumetric air flow measurement via orifice: D=80mm
Heater, adjustable in three stages: 500-1000-1500W
Thermostat: switches off at 50°C
- power consumption: 250W
- max. pressure difference: 430Pa
- max. volumetric flow rate: 13m³/min
- max. head: 70m
- max. flow rate: 100L/h
Tank for additional water: 4,2L
Measuring ranges
- differential pressure (air): 0...1000Pa
- flow rate (water): 12...360L/h
- temperature: 2x 0...50°C, 3x 0...100°C
- humidity: 10...100% r.h.

Dimensions and Weight
LxWxH: 1110x470x1230mm
Weight: approx. 120kg Required for Operation 230V, 50/60Hz, 1 phase or 230V, 60Hz/CSA, 3 phases

Scope of Delivery

1 trainer
1 cooling column type 1
1 GUNT software CD + USB cable
1 set of instructional material

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