Cooling Tower Evaporation Rate Calculation

Evaporation Rate Formula:

\[ Evaporation Rate = 0.001 \times Circulation Rate \times Range \]

Evaporation Rate:

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1. What is Cooling Tower Evaporation Rate?

The cooling tower evaporation rate represents the amount of water lost through evaporation in a cooling tower system. This is a critical parameter in cooling tower operation and water management, as evaporation is the primary mechanism for heat rejection in these systems.

2. How Does the Calculator Work?

The calculator uses the evaporation rate formula:

\[ Evaporation Rate = 0.001 \times Circulation Rate \times Range \]

Where:

\( Circulation Rate \) — Water circulation rate through the cooling tower (GPM)
\( Range \) — Temperature difference between hot water entering and cold water leaving the tower (°F)
\( 0.001 \) — Conversion factor for GPM calculation

Explanation: The formula calculates the evaporation rate based on the principle that approximately 0.1% of the circulating water evaporates for every 1°F of cooling range.

3. Importance of Evaporation Rate Calculation

Details: Accurate evaporation rate calculation is essential for proper water treatment, chemical dosing, makeup water requirements, and overall cooling tower efficiency management. It helps in preventing scale formation and corrosion.

4. Using the Calculator

Tips: Enter circulation rate in gallons per minute (GPM) and temperature range in degrees Fahrenheit (°F). Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is evaporation rate important in cooling towers?
A: Evaporation rate determines the cooling capacity, water consumption, and chemical treatment requirements of the cooling tower system.

Q2: What is the typical evaporation rate for cooling towers?
A: Typically, cooling towers evaporate about 1-2% of the circulating water flow, depending on the heat load and ambient conditions.

Q3: How does ambient temperature affect evaporation rate?
A: Higher ambient temperatures and lower humidity increase evaporation rates, while lower temperatures and higher humidity decrease them.

Q4: What is the relationship between evaporation and blowdown?
A: Evaporation concentrates dissolved solids in the circulating water, requiring periodic blowdown (draining) to maintain proper water chemistry.

Q5: Can this formula be used for all types of cooling towers?
A: This formula provides a general estimate for most mechanical draft cooling towers, but specific tower designs may have variations.