IAQ

For energy conservation and good Indoor Air Quality (IAQ), it is crucial to improve Outdoor Air Quality(OAQ). For achieving good OAQ in urban areas, wind flow patterns among buildings should beimproved as well.In this paper, effects of building layout on outdoor thermal climate and air quality are investigatednumerically. In addition to the environment around pedestrians, enthalpy of outdoor air introduced intobuildings and its air quality are examined from the standpoint of IAQ.

The objective of this paper is to present the contaminant removal efficiency of a prototype air cleanerusing the adsorption/desorption effect and to investigate the practicality of this air cleaner. Toluene andformaldehyde were used as pollutant sources and were emitted at a constant rate in a test chamber.Effects of the number of sorption units, the operational time and mode on the contaminant removalperformance were examined. Sorption materials that were evaluated were a porous material, zeolite,pumice stone, and hydro-corn.

Malaysia is situated near the equator of earth where the weather is hot and humid. The vulnerableenvironment has induced many Indoor Air Quality (IAQ) concerns in hospitals by health professions inmany countries. There is mounting evidence on IAQ exposure leading to excessive morbidity andmortality. Many extensive studies have been conducted but there is not many IAQ standard to-date.The objective of the study is to present the finding of the source of indoor air quality in a new hospital inMalaysia. The study also presents the solution to overcome the IAQ problem faced by the hospital.

This study aimed to investigate volatile organic compound (VOC) emission fluxes from a new air filtermedia and a used one. The emission tests from air filters were carried out by the small chambermethod and a new chamber method developed in this study. And the VOCs in an actual air conditioningunit were measured in order to confirm the emission from the air filter. The some VOCs emitted fromused air filter could be detected in the emission tests. The air filter medias emitted formaldehyde andother organic compounds, and airflow through filter media changed emission fluxes.

In recent years, in the quest focused about energy conservative building design, as a high efficiencyair conditioning scheme, the variable air volume (VAV) systems owe their growing popularity in heating,ventilation and air conditioning (HVAC) applications. This paper reports the simulation study toinvestigate the inherent operational characteristics of direct expansion (DX) VAV air conditioning (A/C)unit when the supply air fan and compressor speeds are varied based on the thermal load persisting inthe conditioned space.

In recent years, volatile organic compounds have caused chemical sensitivity by increasing indoor airpollutant concentrations. In order to solve the problem, Ministry of Health, Labour and Welfare ofJapanese Government established the guideline values for indoor air concentrations for 13 compounds,such as formaldehyde, acetaldehyde, toluene and so on.

When a building is used only for intermittent occupancy, continuous operation of ventilation system isnot necessary for achieving good indoor air quality during the occupation periods. Such buildings havea great energy saving potential which is not harnessed enough yet. Indeed, energy loss can be avoidedby promoting natural means and managing mechanical ones.

Reinforcement of air-tightness and thermalinsulation in the indoors leads to the declinein air-change rate. Moreover, due toincreased chemical substances on furniture,the indoor air-quality becomes worse andmay induce various health problenls, namelythe condition known as the Sick BuildingSyndrome(SB S).Many tools and methods are being developedto improve indoor air-quality.

This presentation will make the audience aware of the importance of ISO-recognized certificationprograms in the testing adjusting and balancing and commissioning of HVAC systems. ImportantISO 17024 standards will be covered as well as their importance. Many faults have been found inexisting testing adjusting and balancing and commissioning certification programs ranging fromconflicting issues within the organization and their testing procedures; political control over theprocess; inconstant certification methods; geographical differences.

In most conditioned spaces, the Mixing Jet Ventilation (MJV) systems are commonly installed. Relying on turbulent mixing, MJV homogeneously controls the room environment. However, Indoor Air Quality (IAQ), draft, and noise can sometimes be drawbacks of MJV systems. In late the 70s, Displacement Ventilation (DV) was first introduced. By supplying low supply velocity air from the floor or lower wall, a stratification zone is formed which forces pollutants to be collected near the ceiling and allows clean air to remain in the breathing zone.