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Lewis Psychrometric Heat-Mass Transfer Analogy Calculator

The Lewis relation is fundamental to cooling tower and evaporative cooling performance modeling.

Calculated Result
0.02527 m/s

Mass Transfer Coeff (hd)

Convective Heat Coeff

30 W/m²·K

Lewis Number

1

Calculation Breakdown

  1. Lewis Analogy Formulationh_d = h_c / (ρ · c_p · Le^(2/3)) => 0.02527 m/s

Transfer Coefficients

Interactive visualization based on your current inputs

Value
0.07.5152330hc (W/m²K)hd (mm/s)MetricValue

What Is the Lewis Psychrometric Heat-Mass Transfer Analogy Calculator?

The Lewis relation is fundamental to cooling tower and evaporative cooling performance modeling.

How Does the Lewis Psychrometric Heat-Mass Transfer Analogy Calculator Work?

The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.

Lewis Psychrometric Heat-Mass Transfer Analogy Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

h_d = \frac{h_c}{\rho c_p Le^{2/3}}

Lewis mass-heat transfer relationship.

How to Use the Lewis Psychrometric Heat-Mass Transfer Analogy Calculator

  1. Enter your primary measurements in the input fields above.
  2. Select your preferred units (e.g. metric or imperial) if applicable.
  3. Review or adjust operational assumptions such as field efficiency.
  4. Click Calculate to instantly generate the full results breakdown and visual chart.
  5. Use the Reset button at any time to clear the form and test a new scenario.

Step-by-Step Example Calculation

Cooling Tower Fill

Input Values:

convectiveHeatCoeffWPerM2K:30.0
humidAirDensityKgPerM3:1.18
humidAirSpecificHeatJPerKgK:1006.0

Understanding Your Result

Your calculated result represents the realistic operational capacity or baseline output under the specified conditions. Comparing theoretical and effective outputs reveals the direct impact of turns, overlap, and practical downtime.

Factors That Affect the Result

Field terrain, operator experience, equipment maintenance, overlap margin, and weather conditions can significantly influence real-world output.

When Should You Use This Calculator?

Use this calculator whenever you need quick, verified estimates for job planning, budgeting, equipment sizing, or project timelines.

Assumptions & Limitations

  • Lewis number Le ~ 1.0 for atmospheric air and water vapor.

Frequently Asked Questions

Calculation Accuracy & Reference Note

This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.

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