Modeling and analysis of heat emissions from buildings to ambient air

摘要: Abstract Heat emissions from buildings is a significant source of anthropogenic heat influencing the urban microclimate; however, they are usually oversimplified in climate and microclimate modeling. This study developed bottom-up physics-based approach to calculate ambient air implemented EnergyPlus. A simple result verification was conducted by comparing EnergyPlus simulated results against spreadsheet calculations. Simulations covering 16 commercial building types, four climates, two energy efficiency levels were understand evaluate their temporal patterns as well three major components: (1) envelope (convective transfer air), (2) zones (air exfiltration exhaust (3) HVAC systems (relief rejection condensers or cooling towers). The main findings are: (1) heat higher than site use (about 2.5 times), dynamics should be considered; (2) building characteristics lead differences emission contributions components, dynamics, for example, warehouse models, component accounts 90.4%, while it 12.7% large office models; most typologies, has strong impact on emissions, with dominant zone and/or reject heat, general decrease hotter climates observed, envelope-dominated show opposite; (4) building technologies that reduce may perform differently reducing emissions. calculation method can adopted other modeling programs. It provide dynamic an input computational fluid (CFD) models at spatial resolution currently available, improve simulation accuracy capture island effect overheating.