Cooling Tower Water Evaporation Rate Calculator

Evaporation Rate Formula:

\[ \text{Evaporation Rate} = \frac{\text{Flow Rate} \times \text{Range}}{\text{Heat of Vaporization} \times \text{Efficiency}} \]

Flow Rate:

gallons per minute

Range:

degrees Fahrenheit

Heat of Vaporization:

BTU per pound

Efficiency:

fraction

Evaporation Rate:

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1. What is Cooling Tower Water Evaporation Rate?

The cooling tower water evaporation rate represents the amount of water lost through evaporation in a cooling tower system. This calculation is essential for proper water management, chemical treatment, and overall system efficiency in industrial cooling processes.

2. How Does the Calculator Work?

The calculator uses the evaporation rate formula:

\[ \text{Evaporation Rate} = \frac{\text{Flow Rate} \times \text{Range}}{\text{Heat of Vaporization} \times \text{Efficiency}} \]

Where:

\( \text{Flow Rate} \) — Water circulation rate (gallons per minute)
\( \text{Range} \) — Temperature difference between hot and cold water (degrees Fahrenheit)
\( \text{Heat of Vaporization} \) — Energy required to evaporate water (BTU per pound)
\( \text{Efficiency} \) — Cooling tower efficiency factor (fraction)

Explanation: The formula calculates water loss based on heat rejection and the energy required for evaporation, adjusted for system efficiency.

3. Importance of Evaporation Rate Calculation

Details: Accurate evaporation rate calculation is crucial for water conservation, chemical treatment optimization, blowdown control, and overall cooling system performance monitoring.

4. Using the Calculator

Tips: Enter flow rate in GPM, range in °F, heat of vaporization (typically 970 BTU/lb), and efficiency (typically 0.7-0.9). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical heat of vaporization value for water?
A: The standard value is approximately 970 BTU per pound at typical cooling tower operating temperatures.

Q2: What range of efficiency values are typical for cooling towers?
A: Efficiency typically ranges from 0.7 to 0.9, with well-maintained towers achieving 0.8-0.85.

Q3: How does evaporation rate affect water treatment?
A: Higher evaporation rates concentrate dissolved solids, requiring proper blowdown control and chemical treatment adjustments.

Q4: What factors influence cooling tower efficiency?
A: Factors include tower design, fill type, air flow, water distribution, and maintenance condition.

Q5: How often should evaporation rate be calculated?
A: Regular calculation (daily/weekly) helps monitor system performance and optimize water usage.