Test stand for CO2 accumulator electric heaters
M a c i e j O s t r ę g a , P i o t r D z i u r d z i a 2 2 . 0 4 . 2 0 1 5
2
• Test stand is working since 15 of March…• Watlow and DIMECA Heaters still alive• On 21.04 has been make swagelok connection on the
Watlow heater to create the same conditions like in CO2 accumulator. The result should be soon.
Status
Tested heaters
Manufactor Manufactor no Details Nominal voltage [V]
Nominal power [W]
WATLOW FIREROD 1348K Standard epoxy insulation. Silicon wires. 240 1000
DIMECA 14/1219090° bent, 55 mm metal tube
insulation and 1100 mm flex hose additional insulation for silicon
wires.230 1000
WATLOW
DIMECA
Tested heaters
Heatername Manufactor Calculated power
at 230VInsulation resistance L-PE
at 1051VInsulation resistance N-PE
at 1051V
IBL_004 DIMECA 916.8 + 11 GΩ + 11 GΩ
IBL_009 DIMECA 951.4 + 11 GΩ + 11 GΩ
CMS_010 WATLOW 961.8 403 MΩ 403 MΩ
Measurements before the test
Test cycle
1. Heating ON with high temp. setpoint 15 °C2. Heating ON with low temp. setpoint -40 °C3. Heating OFF with low temp. setpoint -40 °C [-55 °C]
Results and conclusion
1. All heaters are working fine2. No epoxy damage observed after several heating-cooling cycles3. Epoxy cracking can be caused by the swagelok fittings – under the test4. DIMECA heaters has a big (huge) time delay with the response on power –
interlocked heater at 120°C reached almost 300°C – no possibility to use it as an accumulator heaters!
Results and conclusion
Heatername Manufactor Calculated power
at 230VInsulation resistance L-PE
at 1051VInsulation resistance N-PE
at 1051V
IBL_004 DIMECA 916.8 + 11 GΩ + 11 GΩ
IBL_009 DIMECA 951.4 + 11 GΩ + 11 GΩ
CMS_010 WATLOW 961.8 2.8 GΩ (cold)~200 MΩ (warm)
2.8 GΩ (cold)~200 MΩ (warm)
Measurements after the test
Heatername Manufactor Calculated power
at 230VInsulation resistance L-PE
at 1051VInsulation resistance N-PE
at 1051V
IBL_004 DIMECA 916.8 + 11 GΩ + 11 GΩ
IBL_009 DIMECA 951.4 + 11 GΩ + 11 GΩ
CMS_010 WATLOW 961.8 403 MΩ 403 MΩ
Measurements before the test
Other solutions
Standard WATLOW heater with additional silicone insulation
Other solutionsVULCANIC heaters
TODO
1. Continue the test of the heater with Swagelok connection2. Additional studies for the floating insulation resistance problem3. New tests with the new heaters - WATLOW with additional insulation +
Vulcanic (?)
Backup slides
Test stand
Test stand
Designed by Tomasz Kucharski
Test procedure
• electrical measurements• heating with cooling (setpoint high)• no heating with cooling (setpoint -40 °C)
more details:(DFS) …/PROJECTS/ Accumulator_Heaters_Teststand/DOCUMENTS/
Test stand for CO2 accumulator electric heater.docxAccumulator electric heater - DATA.xlsx
Electrical measurements• resistance of the heater• insulation resistance• earth leakage current
more details:(DFS) …/PROJECTS/ Accumulator_Heaters_Teststand/DOCUMENTS/
Test stand for CO2 accumulator electric heater.docxAccumulator electric heater - DATA.xlsx
Calculated EH resistance [Ω]
Measured EH resistance [Ω]
Insulation resistance [MΩ]
Comments
Calculated earth leakage current at 230V Measured earth leakage currentVoltage during the measurements [V]
Calculated insulation resistance [MΩ]
Test voltage >> 50V 100V 250V 500V 1000V [mA] [uA] [mA] [uA]
52.9 52.8
L/PE - - - - 11000 over the measurement range ( >11 GΩ) 2.09091E-05 0.021 - 0.021 230.0 10952.381
N/PE - - - - 11000 over the measurement range ( >11 GΩ) 2.09091E-05 0.021 30.000 - 230.0 0.008