R&D department

Test rig in

Hydac SA

R&D department

Test rig in

Hydac SA

Time scheduleTime schedule

• Power heat dissipation test rig

• Pulsation test rig

• VG 320 test rig

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Test rig in Hydac

Situation 2001

Power heat dissipation Why this test rig

Power heat dissipation Why this test rig

To measure :

• POWER HEAT DISSIPATION

• PRESSURE DROP

on liquid/air coolers.

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Test rig in Hydac

Analyse our and the competitors’

coolers to acquire know-how

and win on the market !

Power heat dissipation Technical data

Power heat dissipation Technical data

Liquid : mineral oil VG68

Flow max : 350 l/min

Power max : 120 kW

Inlet air temperature : ambient temperature

Inlet liquid temperature max : 70 °C

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Test rig in Hydac

Available motors :

• Electrical AC until 6 kW (20..60 Hz)

• Electrical DC until 32 V & 30 A

• Hydraulic until 80 l/min & 180 bar

Power heat dissipation Tests following DIN/EN 1048

Power heat dissipation Tests following DIN/EN 1048

This mean that the accuracy of instruments and the complete system is guaranteed. The variations of values, during a test, are :

• ± 0.2 °C for temperatures

• ± 0.02 bar for pressures

• ± 1 % for liquid flow rate

to stay in the declared tolerances !

The tests are made at :

• inlet temperature drop = 40 °C

• oil viscosity = 30 mm2/s

to declare what we measure !

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Test rig in Hydac

TÜV SÜDDEUTSCHLAND certify that Hydac SA

makes the tests following the norm EN/ISO 1048 !

Power heat dissipation Costs and improvements

Power heat dissipation Costs and improvements

A test takes in average 1 day to be done.

An operator dedicated at 60 %, the power to heat

the oil and the electricity to run fan, pumps and

other elements are not the only cost that we have

to assume. The certification from TÜV, to calibrate the probes and maintenance have to be summarised to the construction and the new improvemtns.We are looking at an investment to run completely automated tests, to make tests during the night too !

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Test rig in Hydac

PulsationWhy this test rigPulsationWhy this test rig

To evaluate the matrix of liquid/air coolers in dynamic pressure.

NEW

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Test rig in Hydac

We start this year to test with this rig.

In the past this test was made with external resources. This was a problem because we lost know-how and to have the results we wanted was not always possible.

Pulsation Technical dataPulsation Technical data

Liquid : mineral oil VG22

Upper pressure range : 10..30 bar

Frequency range : 0,1..3 Hz

Ambient temperature max : 110 °C

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Test rig in Hydac

We can test 1 big element (EL11) or 3 small (EL3).

Pulsation Tests following ISO/DIS 10771-1Pulsation Tests following ISO/DIS 10771-1

In the liquid/air coolers market, the matrix is characterised by tests which follow the norm ISO/DIS 10771-1.

Test code : ISO 10771-1-16/0.8 bar-107-2Hz/190ms

Means that the test had :

pu = 16 bar

Pl = 0.8 bar

N° cycles = 107

Frequency = 2 Hz

T1 (time for p > pu) = 190 ms

p

t

pu

pl= 5% pu

TR T1 30% T TF 90% T1 T2 110% T1

T = 1 / f (f 3 Hz)

40% T (TR + T1) 60% T

p(T2) pl

p(T1) pu

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Test rig in Hydac

Test resultWhy follow a normTest resultWhy follow a norm

It is important that the data that is declared follows a norm, because otherwise it is impossible to compare values !

How can you win against competitors ?Imagine a test like this. They can easily declare a test with :

f = 2 Hz

pu = 16 bar

and get results like 109 cycles!

p

t

pu

pl= 5% pu

TR T1 30% T TF 90% T1 T2 110% T1

T = 1 / f (f 3 Hz)

40% T (TR + T1) 60% T

p(T2) pl

p(T1) pu

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Test rig in Hydac

This is also valid for the power heat dissipation tests.

VG320Why this test rigVG320Why this test rig

During the integrated bypass project we saw that the viscosity was not sufficient to create the necessary pressure drop in the matrix. Now we are able to see the correct functionality of this particular element.

NEW

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Test rig in Hydac

We had other requests from the lubrication systems and wind turbine gear box market: to test with a synthetic and high viscosity oil.

VG320 Technical dataVG320 Technical data

Liquid : mobilgear oil VG320 (sinthetic)

Pressure max : 20 bar

Flow rate max : 170 l/min

Heat power : 4 kW

Cooling power : 30 kW

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Test rig in Hydac