Question:
The difference between the temperature of water entering the cooling tower and temperature of water leaving the cooling tower is known as :
The difference between the temperature of water entering the cooling tower and temperature of water leaving the cooling tower is known as :
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- Range = What the tower achieves (\(T_{\text{in}} - T_{\text{out}}\)).
- Approach = How close the cold water temperature is to the wet-bulb limit (\(T_{\text{out}} - T_{\text{wb}}\)).
- Approach = How close the cold water temperature is to the wet-bulb limit (\(T_{\text{out}} - T_{\text{wb}}\)).
Updated On: Jul 21, 2026
- Approach of cooling tower
- Gradient of cooling tower
- Lift of cooling tower
- Range of cooling tower
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Cooling towers are heat rejection systems that cool water by evaporating a small portion of it into a moving air stream.
Specific terminology is used to define the performance and temperature changes of the water.
Detailed Explanation:
Let us define the key terms used in cooling tower engineering:
- Range of Cooling Tower (D): This is the difference between the temperature of the hot water entering the cooling tower (\(T_{\text{in}}\)) and the cold water leaving it (\(T_{\text{out}}\)):
\[ \text{Range} = T_{\text{in}} - T_{\text{out}} \] It represents the total amount of cooling achieved by the tower.
- Approach of Cooling Tower (A): This is the difference between the temperature of the cold water leaving the tower (\(T_{\text{out}}\)) and the wet-bulb temperature of the ambient air (\(T_{\text{wb}}\)):
\[ \text{Approach} = T_{\text{out}} - T_{\text{wb}} \] This value indicates how close the tower's performance is to the theoretical thermodynamic limit (wet-bulb temperature).
Therefore, the difference between the entering and leaving water temperatures is defined as the Range.
Step 2: Final Answer:
The difference between the entering and leaving water temperatures is called the Range of cooling tower.
Cooling towers are heat rejection systems that cool water by evaporating a small portion of it into a moving air stream.
Specific terminology is used to define the performance and temperature changes of the water.
Detailed Explanation:
Let us define the key terms used in cooling tower engineering:
- Range of Cooling Tower (D): This is the difference between the temperature of the hot water entering the cooling tower (\(T_{\text{in}}\)) and the cold water leaving it (\(T_{\text{out}}\)):
\[ \text{Range} = T_{\text{in}} - T_{\text{out}} \] It represents the total amount of cooling achieved by the tower.
- Approach of Cooling Tower (A): This is the difference between the temperature of the cold water leaving the tower (\(T_{\text{out}}\)) and the wet-bulb temperature of the ambient air (\(T_{\text{wb}}\)):
\[ \text{Approach} = T_{\text{out}} - T_{\text{wb}} \] This value indicates how close the tower's performance is to the theoretical thermodynamic limit (wet-bulb temperature).
Therefore, the difference between the entering and leaving water temperatures is defined as the Range.
Step 2: Final Answer:
The difference between the entering and leaving water temperatures is called the Range of cooling tower.
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