The test equipment used in the Heat Transfer and Fluid Flow Laboratory was developed here under long term
experiences with industry cooling considering way of calculation, modeling and simulation. The equipment was designed
to work with plenty of modifications that usually occur in industrial spray cooling applications; however the lab is
flexible and able to develop and built equipment for measuring under very specific
When working in the lab, we learnt that the sophisticated measurement technology is essential for getting good
results. Therefore we are continuously observing influences on the result data, following news in instrument
technology, learning and improving. Heat Transfer and Fluid Flow Laboratory also participate in plenty of related
projects e.g. development of new thermal and pressure sensors for rolling.
High Temperature Test Bench
The high temperature test bench is used to simulate spray cooling at high initial temperatures. The typical
application is continuous casting where the experiment usually starts at 1200°C and finishes below
500°C. The main part of the stand is a test plate, made of an austenitic steel, sized 600x320x30 mm. The
test plate embedded by a set of thermocouples is during experiment stable while the nozzles spraying upward move under
the plate. The spray height and nozzle velocity are variables.
Scheme of the high temperature test bench
3D model of the high temperature test bench during experiment
- An electric furnace heats the test plate to an initial temperature of the experiment (1200°C).
- The water/air pressures in the nozzles covered by deflector are adjusted.
- When the furnace is put aside, the deflector is opened and the spraying nozzles start to move under the test
plate according to requirements.
- The temperatures are recorded by thermocouples and saved to data logger located outside the spray box in a
The left picture shows the high temperature test bench when the test plate with embedded
thermocouples is heated (from its bottom side) to an initial experimental temperature by electric heater, on the right
side the electric heater is put away and the test plate is sprayed by set of nozzles
Linear High Speed Test Bench
This experimental stand was built to study the cooling of linearly fast moving objects.
The cooling of long rolled products (beams of various profiles) or the cooling of flat rolled products are typical
industrial applications. Given that the movement of the stand is possible to stop at required positions for required
duration, it is also oftentimes used for various other projects.
The stand allows speed of a tested sample up to 10 m/s, however the typical speed of
5 m/s is applied. The conception of a long girder with a draw trolley which can rotate around its longitudinal axis
enables more sample positions respect to the gravity.
Scheme of linear test bench, 1 – headers with nozzles,
2 – pressure gauge, 3 – test plate, 4 – motor moving trolley, 5 – girder
carrying trolley, 6 – movable trolley, 7 – data logger, 8 – heater, 9 – water
tank, 10 – pump, 11 – control valve
The girder is divided into three two-meter-long sections. The sections are used for the
trolley's acceleration or deceleration. The velocity of the trolley is constant in the mid section and it is here where
the sample embedded by the thermocouples is quenched by the spray nozzles. The nozzle types, their arrangement and the
feeding pressure together with the sample velocity are changeable parameters usually intended to be
The 3D model of the linear test bench; the electric furnace is
schematically drawn by red colour and the test plate cooled by two nozzles is drawn yellow
- A steel sample is heated to an initial start temperature in an electric furnace.
- The heated sample placed on the trolley is set up into the spraying position.
- The pump for the water gets going and the trolley controlled by computer runs several times through the cooling
section under given conditions.
- The temperatures recorded by thermocouples in the steel sample are saved to data logger together with the trolley
Speed Test Bench
This apparatus serves for measurement of cooling intensity vertically moving samples.
The maximum weight of sample is 25 kg and can be moved by velocity up to 5 m/s which is constant for at least 1 m of
its movement. The vertical bench is also equipped by furnace for heating of samples.
Scheme of vertical test bench, 1 – collector with nozzles, 2 – pressure gauge,
3 – test plate, 4 – motor with rope, 5 – girder carrying trolley, 6 – movable
trolley with position sensor and datalogger for recording temperatures and position of the test plate,
7 – heater, 8 – water tank, 9 – pump, 10 – control valve
The vertical test bench with the test sample in the electric furnace in the left picture; the
vertical test bench where the furnace is put away and the sample runs into the cooling section in the right
- A steel sample is heated to an initial start temperature in an electric furnace.
- The water pump is switched on and the water pressure is set up.
- The furnace is put away from the sample placed at the trolley.
- The trolley runs several times through the cooling section under given condition.
- Temperatures recorded by thermocouples in the steel sample are saved to data logger together with the
A test plate running in the cooling section of the vertical test bench
Rotating Test Bench
The rotating test bench is designed for investigation of cooling effects on the rotating cylindrical surfaces. The
parameters of the bench are adapted to the main application which is design of cooling systems of rolling-mill working
rolls. The main part of the equipment is roll with diameter of Ø 650 mm and width of 600 mm powered by
motor for pump station of 150 kW that allows rotational speed 0-5 rps. The roll is equipped by thermocouples
measuring temperature while the roll surface is cooled by spraying nozzles.
Scheme of rotating test bench, 1 – roll, 2 – pressure gauge,
3 – water supply, 4 – manifold, 5 – nozzle, 6 – test segment,
7 – electric motor, 8 – datalogger
There is a test segment located on the roll surface. This part of the perimeter is sophistically embedded by
thermal sensors that are during spraying connected with datalogger. Only the neighbourhood of the test segment is
heated to required initial temperature before the cooling experiment.
3D model of rotating test bench that is before experiment covered by deflector, the electric
furnace prepared to reheat the test segment of the roll is placed in the back side of test bench in the left picture;
on the right deflector is opened and nozzlles spray the roll
The thermal sensors with thermocouple wire installed into the roll
- An external electric heater heats the test segment of roll equipped by thermal sensors.
- When uniform starting temperature is reached, the heater is removed from the roll; the roll is covered by
- The rotation of roll, still covered by deflector, and the pump station are switched on and the coolant pressure is
- When all experimental conditions are set up, the deflector is opened and the cooling starts.
- The temperatures are recorded by thermal sensors during cooling and saved to data logger.
The rotating test bench with closed deflector shortly before experiment when the datalogger has to
be switched on in the left picture; in the right picture there is rotating test bench during cooling
Besides the rotating test bench with diameter of Ø 650 mm, another one with diameter of Ø 350 mm is
available. The roll is placed in closed box with coolant loop that enables to test cooling characteristics of special
Test chamber for performance measuring of heating and cooling
The basis of the test chamber device with the dimensions 4x4x3 m and was made strictly in accordance with the
Czech technical standard DIN EN 442-2 "Radiators: tests and evaluation", which is the Czech version of the European
Standard EN 442-2:1996. The whole device is designed to fully suit cited standard and thus allow measurement of heat
output heaters in accordance with applicable legislation.
The operation of the test facility is secured by a complex system of heat pump, reservoirs of heat and cold,
electric boilers, air handling and distribution systems in walls, floors and ceiling of the chamber. With the help of
these components and a special computer program it is possible, basically in automatic mode, to measure and evaluate
the performance of the heating or cooling element placed in the test chamber circle.www.heatlab.cz
Detailed information (Read more): Test chamber (PDF) (639.62 KB)
Two types of infrared line scanners Raytek are available; RAYTMP150MT for measuring in temperature
range of 100 – 800°C and RAYTMP1501M for measuring in temperature range of 600 – 1200°C
Equipment for impact pressure measurement
Equipment for thermocouples calibration
Metallographic laboratory and microscopy
Chemical and mechanical analysis
Other equipment as separate electric furnace, pumps, spray cooling unit with closed coolant loop
for small stationary samples
can be found in Publications of the Heat Transfer and Fluid Flow Laboratory.