the coudé lab environment boulder 18 march 2009. the coudé lab
TRANSCRIPT
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The Coudé Lab Environment
Boulder18 March 2009
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The Coudé Lab
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Air Curtain Interface
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Instrument Foundations
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Instrument Foundations
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Air Curtain Interface
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Dust Control Requirements
0.002 %/hr ≈ 264 ppm per 24 hrs
Scatter w ith Accumulation
0.0E+00
2.0E-05
4.0E-05
6.0E-05
8.0E-05
1.0E-04
1.2E-04
1.4E-04
1.6E-04
1.8E-04
1.0 1.2 1.4 1.6 1.8 2.0
Distance from Sun Center (solar radii)
Rat
io to
On-
Dis
k Irr
adia
nce
Microroughness
0.01% Coverage
1 Day (0.063%)
1 Week (0.38%)
Figure 15. The figure shows the effects of dust accumulation on the primary mirror after one day and one week, assuming the UKIRT accumulation rate of 0.002 percent per hour. [TN-0013]
… we can tolerate about … 0.3 percent total coverage…we will exceed the stray-light budget after only 132 hours (about five days). [TN-0083]
Photosphere: The scattered light from telescope and instrumentation from angles > 10 arcsec shall be 1% or less.
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Cleanrooms
Class
# 0.5mmparticlesper ft3
# 5.0mmparticlesper ft3
airchangesper hour
ceilingfiltercoverage(%)
airvelocity(fpm)
max.vibration(min/s)
temp.tolerance
RHtolerance
approx.capital costper ft2
office 12-18 ? $10
100,000 100,000 650 18-30 10 $50
10,000 10,000 65 40-60 30 10 ±3.0°F ±5% $200-250
1,000 1,000 6.5 150-300 50 30-50 ±2.0°F ±5% $350-400
100 100 0.65 400-540 80-100 75-90 500 ±1.0°F ±5% ~$1200
10 10 0.065 400-540 100 75-90 250 ±0.5°F ±3% ~$3500
1 1 0.0065 540-600 100 90-100 250 ±0.3°F ±2% ~$10,000+
0.5 0.5 0.0033 540-600 100 100-110 125 ±0.1°F ±1% ~$25,000+
Cleanrooms fall under the following FED-STD-209E classifications:
Note: Dunn environment approximates Class 100,000 (ISO 7) with existing filtration in use
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The Downflow Concept
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Environmental Rooms
• Clean Room – has a controlled level of contamination that is specified by the number of particles per cubic meter at a specified particle size, but it also implies many other parameters.
• Environmental Room - temperature and/or humidity level is controlled at a single set condition within specified tolerances regardless of activity in the room.
• In any case - tight temperature control requires flow that is free of recirculation zones.
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The Coudé Lab
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from “The Harris Guide to Environmental Room Design”
Design Parameters•Temperature and Velocity
•Design set-point (0.5 m/s and 20 or 21 or 22 (0.5 m/s and 20 or 21 or 22 C)C)•Temperature Uniformity @ work surface (0.25(0.25 C)C)•Temperature Gradient through room (0.5(0.5CC))•Velocity (0.5 m/s @ optics)(0.5 m/s @ optics)
•Heat Loads (sensible & latent)•Design allowance (lights, ventilation, instruments, equipment, etc.)•Vagrant Loads (people, laptops, equipment?)(people, laptops, equipment?)
•Humidity•35-50% for comfort, 45% for ESD (45%(45%±5%)±5%)•Low to prevent hygroscopic adhesion of dust
•Dust Control•Filtration vs. cleaning•Contamination control (personnel, construction materials, etc.)
•Pressure Control (positive pressure) •Service Access (access to filters, etc.)•Vibration (fans, equipment locations)
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CROSS FLOW mechanical packaging
Air Handling Unit
Return Air
Supply Air
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CROSS FLOW results
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CROSS FLOW boundary conditions
SUPPLY
RETURN
•Air properties for 3000-m
•16ea – 4’x4’ openings supplying 4 m3/s @18˚C
•16ea – 4’x4’ openings for return @ P=0 Pa
•Thermal properties set up, but never run