By Mat Santamouris, Peter Wouters
* ready in organization with the Air Infiltration and air flow Centre, whose US associate is the Lawrence Berkeley nationwide Laboratory, Berkeley, CA* Written by means of famous specialists from Europe and the USA. Covers key issues in construction air flow, correct to all construction forms* cutting-edge reference on suggestions and applied sciences for development pros Designing for maximum air flow functionality is an important a part of development layout. This publication studies the most learn and business achievements within the box of creating air flow, delivering execs an up to date framework for extra development.Selecting the main applicable air flow method is made specifically tough via the complexities of airflow habit, climatic affects, occupancy styles and pollutant emission features. spotting such complexities, the editors assemble services on every one key factor, supplying an authoritative reference paintings proper for all these drawn to energy-efficient construction layout. From elements to computing device instruments, this ebook deals unique insurance on layout, research and function, and is a vital and complete ebook during this box.
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Extra info for Building Ventilation: The State of the Art
Noise level and natural ventilation potential in street canyons High external noise levels are often invoked to justify the use of air conditioning in commercial and residential buildings. Methods of estimating noise levels in urban canyons are necessary if the potential for naturally ventilating buildings is to be assessed. The estimated noise levels can then be compared to the level of noise at which building occupants might be motivated to close windows in order to keep out the noise, which would also compromise the natural ventilation strategy.
In fact, in street canyons, the air temperature is much lower than in the boundary layer, partially compensating for the heat island effect. 2m/s Source: Georkakis and Santamouris (2003) solar radiation and emissivity for long-wave radiation, have a very important impact on the urban energy balance (Santamouris and Georgakis, 2004). The use of highalbedo materials reduces the amount of solar radiation absorbed by building envelopes and urban structures, and keeps their surfaces cooler. Materials with high emissivity are good emitters of long-wave radiation and readily release the energy that has been absorbed as short-wave radiation (Santamouris, 2001).
The panels in the second row show the frequency distribution of the outdoor temperature in bins of 1° C at 12 hours and 18 hours. The integral of this distribution is the sum of occurrences over a year – that is, 365. The last row shows the degree hours obtained with equations (55) and (56). We may notice that free cooling is not possible at 12 hours because the free-running temperature is lower than the outdoor temperature due to the thermal inertia of the building. The integrals of DHmc(To) and of DHfc(To) represent the degree hours for mechanical cooling, DHmc, and free cooling, DHfc, respectively.
Building Ventilation: The State of the Art by Mat Santamouris, Peter Wouters