  Windows are one of the main contributors to building energy consumption, and
emerging dynamic window technologies offer improved performance. Specifically,
NIRfocused window technologies are desirable in climates that consume both
heating and cooling energy. However, the whole building energy effects of
changeable NIR response of building windows have not been captured, largely due
to the lack of an appropriate energy simulation method and NIR-focused window
modeling. This study focuses on developing a simulation method that enables the
comprehensive evaluation of the whole building energy effects of dynamic NIR
modulations. Using an EnergyPlus EMS-based parametric framework, annual energy
savings were estimated for a switchable between glass built-in system across
three representative cities in ASHRAE climate zones 3, 4, and 5. This
NIR-focused technology yielded energy savings of up to 19%. The results
demonstrate the effects of NIR-focused window technologies on heating and
cooling loads in different climates.
