Thermodynamics > Heat transfer





This is a cooling tower demonstration unit.

Water is heated in the storage tank, pumped through a flow meter and sprayed at the top of the tower. The packing in the tower breaks the water into thin films and droplets. The water is cooled mainly by evaporation and drops to the bottom tank. Makeup water is admitted to the storage tank through a float valve. A small blower with a flow control valve is connected to the bottom tank, and air is driven upwards through the column and exhausted at the top.

Instrument are provided for measurement air flow rate, water flow rate, pressure drop across the cooling tower, temperature and moisture of the inlet and outlet air.

Instruction manual is also included.

  • Observation of water flow patterns and distribution.


  • Measurement of water and air flow rates, temperatures and    humidity.


  • Application of steady flow equation to energy balance.


  • Cooling tower performance at various air and water flow rates with different inlet water temperatures.

  • Packed column
: 150 mm x 150 mm x 600 mm high in transparent front cover with 100 m2/m3 plate packing
  • Blower
: Maximum flow rate over 3 m3/min
  • Hot water pump
: Maximum flow rate over 20 Lpm
  • Heater
: 1500 W
  • Storage tank
: Stainless steel
  • Makeup water tank
  • Temperature control unit to limit hot water temperature
  • Stainless steel hot water tank level switch to prevent heater operation if level is too low.
  • Measuring instruments
- Airflow rate : Inlet orifice plate
- Pressure drop : Twin inclined water manometer (one for air flow rate) 0-450 mm x 1 mm graduation with
multiple slope 1:10, 1:5, and 1:2 for pressure drop across the column
- Water flow rate : Variable area flow meter
- Sensors with digital display : Temperature for water inlet and outlet
: Temperature / humidity sensors for air inlet and outlet
  • Power supply
: 220 V, 1 Ph, 50Hz. Other power supply is available on request.

Net (unpacked) shipping dimensions WxLxH  : 70 x 140 x 140 cm

Net weight  : Approx. 120 kg (w/o spare column)

  • TH251S
Learning Software
 to support both online/offline training with data calculation and analysis by manual data entry from analog measuring instruments.
  • TH251-001

Bare column for preparing other experiment.

  • TH251-002
Plate packing 70 m2/ m3
  • TH251-003
Plate packing 150 m2/ m3
  • TH251-004
Plate packing 200 m2/ m3
  • TH251-005
Wooden packing 100 m2/m3
  • TH251-006
Special packed column with additional data ports for wet bulb, dry bulb, and water temperatures at three levels.
  • TH251-010A
Anemometer, 1-10 m/s, instead of inlet orifice with inclined water manometer.
  • TH251-050
Computer Interface (computer not included)
 This includes TH251S and significant sensor(s) instead of analog measuring instrument(s), data acquisition (capture, display, graph and/or data export),

additional software function for real-time data logging with computer interface unit and WiFi feature for data logging and real-time display remotely on smartphone (iOS and Android)

  • TH251-060
Computer Control (computer not included)
 This includes TH 251-050 with the additional accessories for control function and additional software function for equipment controls by computer
  • TH251S
Learning Software

to support both online/offline training with data calculation and analysis by manual data entry from analog measuring instruments.