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Thermal Design-General Properties Thermal Design-General Properties
Heated by Kapton isolated heating foils
Optimized for the use with limited area and weight standards
Optimized for vacuum conditions
Operating range: -32°C to 150°C
Resistance tolerance: ±10% or ±0.5
Current limit: 3.0A at 100°C (AWG 30)
Minimum bending radius: 0.8 mm
Deliverable from stock (www.minco.com)
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Thermal Design-Electrical Properties Thermal Design-Electrical Properties
Temperature dependent resistance: RT
Resistance temperature coefficient: TCR = 0.00427 //°C
Supply voltage: 28V
Maximum power density: 4 W/cm²
Operation temperature limited to 60°C
Temperature controlled by sensors type Pt100 (7.6 mm x 7.6 mm, operating range –200°C to 200°C)
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Thermal Design-Dimensional Requirements IThermal Design-Dimensional Requirements I
Type 1: x=50.8, y=50.8 mm, placed at the inner envelope walls
Type 6: x=19.8, y=70.1 mm, placed at the inner walls of the tip
Type 11: x=34.3, y=11.4 mm, placed at the bottom of the tip
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Thermal Design-Dimensional Requirements IThermal Design-Dimensional Requirements IM
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Thermal Design-Foil PositioningThermal Design-Foil Positioning
• F1 heat segment Q1
• F2+F3 heat segment Q2
• F4ǁF5ǁF6 heat segment Q3
• F7ǁF8ǁF9 heat segment Q4
• F10ǁF11ǁF12 heat segment Q3
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Heating equipment segmented in 5 regions:
Thermal Model IThermal Model I
Differentiated into subdomains: , , c, Q
S1...brass tip
S2...heating element Q1
S3...heating element Q2
S4...heating element Q3
S5...heating element Q4
S6...heating element Q5
S7...envelope of the MP
S8...top cap of the envelope
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Thermal Model II Thermal Model II M
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QTt
tzrTTCp
),,(
)(
With:
Q = 0 without heating foils
Q = P/V [W/m³] with heating foils depending on the parameters of the foils used
Equation of heat transfer:
Thermal Model III Thermal Model III
Parts of the surface of the probe not covered with ice; the surface of the ice
All other boundaries, thermal insulation
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Boundary conditions:
44 TTT amb
0T
Thermal Model-Different Scenarios Thermal Model-Different Scenarios M
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1) The MP is surrounded by vacuum, only Q1 and Q2 are active
2) The MP has penetrated the ice to a depth of 1.5 mm, Q1 and Q2 active
3) The MP is surrounded by ice, all Q´s have been deactivated and the probe has cooled down. After a certain time the Q´s are reactivated
Thermal Model–Results Case 1 Thermal Model–Results Case 1 M
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Thermal Model–Results Case 2 Thermal Model–Results Case 2 M
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Thermal Model–Results Case 3 Thermal Model–Results Case 3 M
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L2
Thermal Model–Results Case 3 Thermal Model–Results Case 3 M
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Temperature at L1: z=0.1, r=0.031250.1
Temperature at L2:z=0.201, r=0.032150.1
Thermal Model–Outlook Thermal Model–Outlook
Including the influence of the self heating of the tether
Including the influence of the electronics box
Combine this model with a model calculating the sinking of a cylinder
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Thermal Model–Outlook Thermal Model–Outlook M
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