The external radiation sources are ignored on the boundaries when neither Diffuse Surface, Diffuse Mirror, Opaque Surface nor Semi-Transparent Surface is active.
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xs should not belong to any surface where a Diffuse Surface, Diffuse Mirror, Opaque Surface or Semi-Transparent Surface boundary condition is active.
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Solar position is available for 3D components. When this option is selected, use it to estimate the external radiative heat source due to the direct striking of the Sun rays.
North, west, and the up directions correspond to the x, y, and z directions, respectively. Azimuth angle is measured from true north, hence x direction corresponds to true north as well.
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Latitude, a decimal value, positive in the northern hemisphere (the default is Greenwich UK latitude, 51.477). Enter a value without a unit to avoid double conversion. This is because the latitude value is expected to represent degrees but the model’s unit for angles may be different (for example, the SI unit for the angle is radians).
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Longitude, a decimal value, positive at the east of the Prime Meridian (the default is Greenwich UK longitude, −0.0005). Enter a value without a unit to avoid double conversion. This is because the latitude value is expected to represent degrees but the model’s unit for angles may be different (for example, the SI unit for the angle is radians).
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Time zone, the number of hours to add to UTC to get local time (the default is Greenwich UK time zone, 0). For example in New York City, USA the time zone is UTC–5 hours (standard time zone) or UTC–4 hours (with daylight saving time).
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Day, the default is 01. Enter a value without a unit to avoid double conversion. This is because the value is expected to represent days but the model’s unit for time may be different (for example, the SI unit for time is seconds).
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Month, the default is 6 (June). Enter a value without a unit to avoid double conversion. This is because the value is expected to represent months but the model’s unit for time may be different (for example, the SI unit for time is seconds).
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Year, the default is 2012. Enter a value without a unit to avoid double conversion. This is because the value is expected to represent years but the model’s unit for time may be different (for example, the SI unit for time is seconds). The solar position is accurate for a date between 2000 and 2199.
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Hour, the default is 12. Enter a value without a unit to avoid double conversion. This is because the value is expected to represent hours but the model’s unit for time may be different (for example, the SI unit for time is seconds).
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Minute, the default is 0. Enter a value without a unit to avoid double conversion. This is because the value is expected to represent minutes but the model’s unit for time may be different (for example, the SI unit for time is seconds).
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Second, the default is 0.
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The Wavelength dependence of radiative properties is defined in the physics interface settings, in the Radiation Settings section. When only one spectral band is defined, the i subscript in variable names is removed.
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The sun position is updated if the location, date, or local time changes during a simulation. In particular for transient analysis, if the unit system for the time is in seconds (the default), the time change can be taken into account by adding t to the Second field in the Local time table. Note that no validity range is prescribed on the time inputs. It is possible to enter values that exceed the expected boundary. For example, entering 5h 2min 81s is equivalent to 5h 3min 21s. This makes it possible to enter t in the second field, even if the solution is computed for more than 60s.
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Sun’s Radiation Effect on Two Coolers Placed Under a Parasol: Application Library path Heat_Transfer_Module/Thermal_Radiation/parasol
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