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) 

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 (%)