Evaporation Loss In Cooling Tower Formula

Evaporation Loss Formula:

\[ E = 0.001 \times C \times (T_{in} - T_{wb}) \]

Evaporation Rate (E):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Evaporation Loss in Cooling Tower?

Evaporation loss in cooling towers refers to the amount of water that evaporates during the cooling process. This is a natural consequence of heat transfer where water absorbs heat and changes from liquid to vapor phase, carrying away heat energy from the system.

2. How Does the Calculator Work?

The calculator uses the evaporation loss formula:

\[ E = 0.001 \times C \times (T_{in} - T_{wb}) \]

Where:

\( E \) — Evaporation rate (gpm)
\( C \) — Circulation rate (gpm)
\( T_{in} \) — Inlet water temperature (°F)
\( T_{wb} \) — Wet bulb temperature (°F)

Explanation: The formula calculates the evaporation rate based on the temperature difference between the hot water entering the tower and the ambient wet bulb temperature, multiplied by the circulation rate and a constant factor of 0.001.

3. Importance of Evaporation Loss Calculation

Details: Accurate calculation of evaporation loss is crucial for water treatment programs, chemical dosing, makeup water requirements, and overall cooling tower efficiency management. It helps in optimizing water usage and preventing scale formation.

4. Using the Calculator

Tips: Enter circulation rate in gallons per minute (gpm), inlet temperature in °F, and wet bulb temperature in °F. All values must be valid positive numbers with appropriate temperature ranges.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of wet bulb temperature?
A: Wet bulb temperature represents the lowest temperature that can be achieved through evaporative cooling and is a key parameter in determining cooling tower performance.

Q2: How does evaporation affect cooling tower operation?
A: Evaporation is the primary cooling mechanism in cooling towers. As water evaporates, it removes latent heat, cooling the remaining water in the system.

Q3: What is the typical range of evaporation loss?
A: Typically, evaporation loss ranges from 1-2% of the circulating water flow rate for each 10°F temperature drop across the tower.

Q4: How does evaporation loss impact water treatment?
A: Evaporation concentrates dissolved solids in the circulating water, requiring blowdown to maintain proper cycles of concentration and prevent scaling.

Q5: Can this formula be used for all cooling tower types?
A: This formula provides a general estimation for mechanical draft cooling towers. Specific tower designs and environmental conditions may require more detailed calculations.