Boiling Process Apparatus Model TH 071

* Visualisation of boiling and evaporation1
* Software for data acquisition

Item Description

Heating a liquid over a heating surface produces different modes of boiling dependent on the heat flux density.
They can accelerate the evaporation process (nucleate boiling) or impair it (film boiling). In practice, a limitation
of the heat flux density must be assured in order to prevent damage to the heating surface. This knowledge is
applied in practice e.g. when designing steam boilers for steam-powered drives.
Sci-tech Boiling Process Model TH 071 experimental unit can be used to demonstrate boiling and
evaporation processes in a straightforward manner. The processes take place in a transparent tank. A
condenser in the form of a water-cooled tube coil ensures a closed circuit within the tank. Compared with water,
this liquid has the advantage that its boiling point is at 36,7°C (1013hPa), whereby the evaporation process
takes place at much lower temperatures and a lower heating power.

Technical Specifications

[1] visualization of boiling and evaporation in a transparent pressure vessel
[2] evaporation with heating element
[3] condensation with tube coil
[4] safety valve protects against overpressure in the system
[5] pressure switch for additional protection of the heating circuit, adjustable
[6] sensors for pressure, flow rate and temperature with digital display
[7] software for data acquisition via USB under Windows Vista or Windows 7
[8] CFC-free evaporating liquid

Technical Specifications

Heater: power: 250W, continuously adjustable

Safety valve: 2bar rel.

Pressure vessel: 2850mL

Condenser: coiled tube made of copper

Measuring ranges

– tank pressure: 0…4bar abs.

– power of heater: 0…300W

– flow rate (cooling water): 0,05…1,8L/min

– temperature: 4x 0…100°C