ENGINEERING CALCULATORS
Advertisement space
Engineering calculators (Beta)
Find net radiation from a surface to a large surrounding enclosure.
Click the grid to add ordered vertices. Edit coordinates in mm; separate holes with a blank line. The last vertex closes to the first automatically.
Choose units and enter numbers. Full-width digits and fractions such as 1/8 or 1 3/8 are accepted. Changing a unit converts the entered value.
Reference calculation only. Results do not certify suitability for an actual design or its safety.
Inputs: select a blue symbol to edit Results: red-orange values and lines
3D shows an illustrative extrusion. Its display length does not enter the section calculations. Edit dimensions in 2D.
Q̇=εσS A(T⁴−Ta⁴); σS=5.670374419×10⁻⁸ W/(m²K⁴).
Displayed values are rounded. Diagrams illustrate the calculation conditions. Initial material and fluid properties are examples; replace them with values for the actual material, temperature and conditions.
ReferenceEquations assume particular loads, supports and deformation ranges. Check inputs, units and the applicability of each equation. Diagrams explain conditions; they are not manufacturing drawings or proof of safety.
Material values are typical values or reference ranges, not certified product properties or ready-to-use design allowables. They vary with standards, product form, dimensions, temper and temperature. Check the specifications and inspection certificates for the actual product.
Displayed safety factors and checks apply only to the supplied inputs and calculation model. They do not automatically establish the safety of a complete design, including code compliance, service life, fatigue or joints. For actual design, manufacture and use, separately verify applicable regulations and standards, product specifications, and the necessary tests and engineering review.
Advertisement space
表面温度・周囲温度・放射率から、大きな周囲への正味放射熱量を求めます。
選択した形状・計算方法により、使う項目は変わります。実際の計算は上の図と入力欄で行えます。
Q̇=εσS A(T⁴−Ta⁴); σS=5.670374419×10⁻⁸ W/(m²K⁴).
対象は一様温度の灰色表面、十分大きな周囲との形態係数を1とするモデルです。計算は絶対温度Kで行います。有限の2面間、多重反射、透過、対流・伝導は含みません。εは表面状態・温度・波長条件に合う値を入力します。
現在選択中の方法には、操作欄の「計算式・適用条件」を使ってください。参考計算であり、設計全体の安全性を保証するものではありません。
Find net radiation from a surface to a large surrounding enclosure.
The selected model determines which of these inputs and outputs apply. Use the working diagram and input panel above to calculate.
Q̇=εσS A(T⁴−Ta⁴); σS=5.670374419×10⁻⁸ W/(m²K⁴).
Uniform grey surface with view factor 1 to a large enclosure. Calculations use absolute kelvin. Exchange between two finite surfaces, multiple reflections, transmission, convection and conduction are excluded. Match emissivity to surface condition, temperature and relevant spectrum.
The displayed formula and conditions in the working panel apply to the currently selected model. Reference calculation only; it does not certify a complete design.
