Evaporation, drift, blowdown and makeup water balance from mass conservation, plus Langelier Saturation Index scaling/corrosion risk screening for the circulating water.
Local Engine
Project Information
Heat Load & Water Balance
Cooling range (ΔT): —
Typical operating range: 3–6.
Default 0.00153 (metric, m³/h & °C basis) — see methodology note below. Typical range 0.00115–0.00195 for climate variation.
Circulating Water Chemistry (for LSI)
Estimate from Makeup Water Optional
If you only have makeup water lab data on hand, enter it here and estimate the concentrated circulating-water values (Ca, Alkalinity, TDS all scale × CoC at steady state). Note: pH does not scale linearly with CoC (CO2 stripping in the tower shifts the carbonate equilibrium) — estimated circulating pH typically settles between 8.2–8.8 unless acid is dosed. Enter your own circulating water pH reading above rather than scaling it.
Water Balance Results
Evaporation Loss (E)
—m³/h
E = k × Flow × ΔT
Drift Loss (D)
—m³/h
—
Blowdown Required (B)
—m³/h
B = E/(CoC−1) − D
Total Makeup Water (M)
—m³/h
M = E + D + B
Achieved CoC: —
Heat rejected (informational): —
Scaling & Corrosion Risk (LSI)
ℹ
—
Enter circulating water chemistry to evaluate scaling/corrosion risk.
Saturation pH (pHs)
—
Langelier Saturation Index
—
LSI = pH − pHs
Ryznar Stability Index
—
RSI = 2×pHs − pH
Design Notes & Warnings
Export includes the current water balance and water chemistry configuration and results.
Evaporation coefficient: the commonly cited "0.0008/0.00085 × flow × range" rule of thumb is an imperial constant (gpm, °F) — used directly against a Celsius ΔT without the required ×1.8 unit conversion it understates evaporation by roughly 1.8×. This tool defaults to the converted metric constant, 0.00153, cross-checked against the independent "~1% evaporation per 5.6°C range" industry rule of thumb.
このエンジニアリングツールは現在、英語版のみ提供しています。
01
エンジニアリングの根拠
方法
蒸発・飛散・ブローは標準的な質量保存の水収支(CTI/ASHRAE の慣例)に従います。蒸発損失は循環水量 x 冷却範囲に比例し、飛散損失は選択したドリフトエリミネーターの性能クラスに従い、強制ブローは濃縮倍数の定常状態物質収支から直接求められます。