The efficacy of a natural ventilation strategy is essentially conditioned by the sizing ofcomponents on which the airflow control depends. The indoor environment conditioning issubmitted to strict regulation. The implementation of the natural ventilation strategy is relatedto the building layout; therefore, the devices sizing is important for the architect. On the basisof the loop equation proposed by James Axley, we developed a simple sizing tool.
Natural ventilation is a prevailing way to relieve the indoor thermal environment against warmand humid climate. The field measurement of the thermal performance of a model house withnaturally ventilated double skin walls compared with a conventional insulated model housewas carried out. Only the gap between the double skins is ventilated, while the indoor of theconventional model is ventilated mechanically.
Natural controlled ventilation is often ignored when buildings are designed. It is importantthat architects, property developers both commercial and residential, designers, engineers andthe general public be aware of guidelines (readily available) for proper indoor air quality.Mechanical engineers should realize that introducing supplemental fresh air ventilation intoheating, ventilating and air conditioning (HVAC) systems aids in improving indoor air qualityand often maximizes the efficiency of the HVAC systems.
This paper is about the application of active stack system to enhance natural ventilation inpublic housing in Singapore. About 86% of the population is staying in high-rise publichousing, known as Housing and Development Board (HDB) flats, which is designed fornatural ventilation. The main objective of this work is to assess the status of naturalventilation in a typical 4-room HDB flat using scaled model in the wind tunnel, and todevelop an effective active stack system to enhance natural ventilation in the flat.
Almost all existing analysis methods for building ventilation airflows, such as the simpleanalytical methods, multi-zone methods and computational fluid dynamics (CFD), give onlyone unique solution for one set of identical input parameters when started with zeroinitialization or zero initial conditions. This can be shown to be incorrect in some situations.Multiple stable solutions are found in some very simple buildings, which indicate that thebuilding airflows are of a nonlinear dynamical system.
A study of the microclimate in four rooms in historic buildings reveals the different priorities,and, therefore, the different climatic data, needed by museum conservators, compared withpeople studying human welfare. In particular, it is important for conservators to know if a lowpollutant concentration indoors is due to a clean outdoor climate, a low air exchange rate orpollutant absorbent artwork on the interior walls of the building.
This paper provides a research about rapid methods and simplified tools to assist the projectactors, such as architects, designers and engineers, involved in the building design, in theearliest conception during the preliminary design. We examine the quality criteria of indoorthermal environment in non-residential existing buildings, with failure in the pre-energyconservation. The main objective is how well to predict a mean thermal comfort sensation forworkers under warm conditions over the tropical climate. The occupants could change theiractivity (metabolic rate) and their clothing.
Ultra-fine and fine particle formation as a result of chemical reactions between ozone and fourdifferent air fresheners and a typical lemon-scented domestic cleaner was studied in a fullyfurnished, naturally ventilated office. The study showed that under conditions representativeof those occurring in such offices, air fresheners or scented cleaners may react with ozone toform secondary organic aerosols (SOA). The tested air fresheners were relatively smallsources of SOA with detectable increases occurring only in the ultra-fine particle numberconcentration.
Natural ventilation and infiltration are used for pollutant dilution and providing ‘fresh’ outdoor air supply in many buildings, in particular in residential buildings. Questions are often asked when natural ventilation should be encouraged. A balance-poi
The main objective of this study is to develop a thermal comfort (TC) prediction model suitable for Naturally Ventilated (NV) buildings located in hot and humid tropical climate. More than 1000 data were collected through extensive field survey in Singapore and Indonesia. The surveys finding based on the statistical analyses unveiled that people in the tropics have shown tolerance and different perception of TC than those in the temperate climate. Fuzzy logic concept is adopted to develop an appropriate TC model for tropical NV houses.
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