Economic comparison of cool and grey roofs of a small office building in the USA

EnergyPlus V9.0 simulations of a typical small office building prototype in five USA cities (Albuquerque, Atlanta, Buffalo, San Diego, Rochester) indicate that adding cool roof (albedo 0.6) for an aged grey 0.2) would reduce the annual energy and cost all hot dry or humid Diego) severe cold mixed (Buffalo, Rochester). The CO2, SO2, NOX savings are positive selected cities. This work considers economics using roofs by performing 20-year life-cycle analysis compares each type to roof. net present values (NPVs) conditioning (heating + cooling) were calculated. life cycle (NPV streams – initial premium) have both negative values. NPV with is from -17.3 USD/m2 Rochester 6.5 Diego. Among USA, Albuquerque, Diego able apply since they NPV, while Buffalo unsuitable methods because NPV. Owners concerned urban heat island mitigation slowing climate change may prefer