This paper presents a numerical investigation of dew formation on the roofs of buildings, and its influence on building thermal and energy performance. A new semi-analytical model was developed to evaluate the effects of rooftop dew, including the release/absorption of latent heat due to condensation/evaporation, the variation of apparent thermal emittance of the roof upper surface, and the dew runoff characterised based on laboratory experiments. A set of case study simulations was carried out by implementing the rooftop dew model in the building performance simulation (BPS) software EnergyPlus. Through its impact on roof top surface temperature, dew was found to significantly influence predictions of benefits and penalties of a ‘cool roof’ versus a bare metal roof. When dew effects were neglected in the simulations, the electricity savings attributed to the cool roof were over-predicted by between 39 % and 204 %, however, the gas heating ‘penalty’ of using a cool roof was ove
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If you know anything about the UK, you know that the phrase “scorching hot” isn’t that often associated with anything that happens here. Yet in London, back in 2013, there was a building that could melt cars, fry eggs, start fires, and cause sunburn.
This London Glass Skyscraper Could Melt Jaguars, Fry Eggs and Start Fires 5 Apr 2021, 14:00 UTC ·
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“fascinating car-related trivia:” the building is officially called 20 Fenchurch Street, after the name of the street it’s built on. It’s situated in the heart of London’s financial district, on the edge of a conservation area, and it’s perhaps one of the most controversial buildings to have been erected in the capital in recent years. Least of all for the fact that it once caused considerable damage to a parked Jaguar.