User Manual

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List of Requirements for Analysis
Refer to the following list while preparing your project for
thermal analysis. The more detail our engineers receive, the more
accurate and useful the simulation will be.
1. Problem Statement
What “question(s)” need to be answered by this analysis?
• Generally the customer is interested in solving one or more
of the Thermal Requirements from below.
2. Definition of the Environment
All of the drawings, files, and notes that would help our
engineers accurately simulate the environment in which the
heater will be operating. The CFD analysis takes into account
much more environmental factors, and as such will require
additional data over the FEA.
• 3D CAD files (preferable) or Drawings
− Heat Sink, hardware, enclosures, etc.
− Parasolid, .STEP file, or .IGES file
− 3D CAD for EVERYTHING around or near the part (CFD
only)
− 3D CAD for materials being processed (solids to be
melted, for example)
• Bill of Materials (BOM)
− Unique materials should be provided with material
properties for the range of temperatures being calculated
− Heat Capacity (specific heat)
− Thermal Conductivity (isotropic or anisotropic?)
− Emissivity (typically important above 100C delta between
ambient and solids)
− Density (including a temp/density curve for gasses,
driving natural convection)
− Maximum Material Temperature (usually important for
plastics)
• Ambient Conditions (CFD)
− Any known heat transfer coefficients on any surfaces
− Surrounding environment surface temp and material of
surface
− Forced or natural convection in surrounding environment
− Min/max environment temp
− Environment humidity
− Pressure (vacuum or other)
− Gas mix (air, nitrogen, etc.)
• Ambient Conditions (FEA)
− Any known heat transfer coefficients on any surfaces
− Ambient temperature of surfaces
3. Heater Requirements
Understanding the project’s heater requirements will help
us narrow down the product you need. As with Step 2, CFD
analyses require much more understanding of the thermal
requirements of the heater, and consequently require more
data.
• Thermal Requirements (CFD)
− Min/max operating temperature
− Maximum safe surface temperatures (in case user touches
a hot surface)
− Temperature ramp-up rate (warm up rate)
− Temperature ramp-down rate (cooling rate)
− Warm up time
− Thermal uniformity
− Maximum power available
− Sensor/Controller
− Type of control system
− Type of sensor
− Location of sensor
• Thermal Requirements (FEA)
− Min/max operating temperature
− Maximum safe surface temperatures (in case user touches
a hot surface)
− Thermal uniformity
− Maximum power available
4. Additional Details
• Technical/Engineering Contact (to be used during simulation
setup)
• Justification over real-world testing/experiment
− Will you save time/cost by comparing early design ideas/
iterations without fabrication?
− Or will real-world testing/fabrication be required for all
options either way?
• OPTIONAL: Performance Data for existing/similar design
− Used to qualify CFD setup and develop transfer functions.