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 (%)