Lighting cooling interaction calculator

The case assumes lighting energy becomes a cooling load and does not credit cooling-demand reduction.

S_{\text{cool}} = \frac{{\Delta E_{\text{lighting}}} \times c_{e}}{\mathrm{COP}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

S_{\text{cool}} = \frac{47{,}000 \times 0.12}{3.1} \approx 1{,}819

Symbol	Meaning	Unit
$S_{\text{cool}}$	avoided cooling energy cost	$/yr
${\Delta E_{\text{lighting}}}$	lighting electric reduction within cooled space	kWh/yr
$c_{e}$	energy price	$/kWh
$\mathrm{COP}$	cooling performance	ratio

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.