ENGINEERING CALCULATORS
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Engineering calculators (Beta)
Use a sensible-heat balance to compare required ventilation with actual airflow.
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.
Qreq=P/(ρcpΔTlim); ΔT=P/(ρcpQ); Premovable=ρcpQΔTlim.
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.
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制御盤などの顕熱収支から必要換気量を求め、実風量と比較します。
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。
Qreq=P/(ρcpΔTlim); ΔT=P/(ρcpQ); Premovable=ρcpQΔTlim.
十分に混合された空気の定常顕熱収支です。Pは換気で除去すべき正味の熱量。壁からの伝熱を差し引くなら別途評価してください。ファンの自由吹出風量ではなく、フィルター・流路の圧損時の実風量を入力します。短絡流、局部高温、湿度・潜熱、外気温の変動、ファン故障・騒音は判定しません。
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。
Use a sensible-heat balance to compare required ventilation with actual airflow.
The selected model determines which of these inputs and outputs apply. Use the working diagram and input panel above to calculate.
Qreq=P/(ρcpΔTlim); ΔT=P/(ρcpQ); Premovable=ρcpQΔTlim.
Steady sensible-heat balance for well mixed air. P is net heat assigned to ventilation; wall heat transfer must be assessed separately if deducted. Enter actual airflow at filter/duct pressure loss, not free-air fan rating. Short-circuit airflow, hotspots, humidity/latent heat, changing ambient temperature, fan failure and noise are excluded.
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.
