Enter the cooling (BTU/hr) and the power consumed (W/hr) into the calculator to determine the Chiller Efficiency.

## Chiller Efficiency Formula

The following formula is used to calculate the Chiller Efficiency.

Echill = C/ PC *100
• Where Echill is the Chiller Efficiency (%)
• C is the cooling (BTU/hr)
• PC is the power consumed (W/hr)

To calculate the chiller efficiency, divide the cooling output by the power consumed.

## How to Calculate Chiller Efficiency?

The following two example problems outline how to calculate the Chiller Efficiency.

Example Problem #1:

1. First, determine the cooling (BTU/hr). In this example, the cooling (BTU/hr) is given as 140.
2. Next, determine the power consumed (W/hr). For this problem, the power consumed (W/hr) is given as 200.
3. Finally, calculate the Chiller Efficiency using the equation above:

Echill = C/ PC *100

Inserting the values from above and solving the equation:

Echill = 140/200 *100 = 70 (%)

Example Problem #2:

Using the same process as above, first define the variables required by the formula. In this case, these values are:

cooling (BTU/hr) = 300

power consumed (W/hr) = 500

Entering these values yields:

Echill = 300/ 500 *100 = 60 (%)