AIVC - Air Infiltration and Ventilation Centre

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The effect of perceived indoor air quality on productivity

A new derivation of productivity calculation model based on pollution loads and contaminantremoval effectiveness is applied and the effect of the improved ventilation efficiency onproductivity is estimated. The findings show that the proportion dissatisfied could be asuitable predictor of productivity loss due to indoor air quality in different kinds of officework. The proportion dissatisfied is possible to calculate from olf and decipol units. In a caseof one person per 10 m2 (0.1 olf/m2) and low-emitted material (0.1 olf/m2), the total sensorypollution load is 0.2 olf/m2.

European testing programme investigating the operation of an innovative ventilation system for houses in temperate climates

In northern Europe ongoing changes in legislation that require increased levels of insulation,and the sealing of houses to reduce infiltration heat loss, has led to concerns about indoor airquality. As a result there is a need to achieve regulated and energy efficient winter ventilationin houses. The system currently being tested (WHOLE-pvs) in paired (test and control)houses and flats in Denmark, Poland and Ireland uses supply air windows in combinationwith Passive Stack Ventilation.

Development of contamination testing protocol for ventilation system components

In time, ventilation ducts and accessories get dirty and this may lead to malfunction of ventilationequipment, fire hazard and especially a decrease in supply air quality. Repeated cleaningof the components can prevent these adverse effects. The frequency of cleaning dependson how easily different components get dirty.

The influence of the capture jet on the efficiency of the ventilated ceiling in a commercial kitchen

The ventilated ceiling is a flexible solution for kitchen ventilation where the heat loads arerelatively low and aesthetics is a concern. The use of hoods is an ideal solution for locallyhandling contaminants produced in concentrated areas. Thus, special attention should betaken on the ventilated ceiling which removes air at the ceiling level. The simulationsconducted show that the capture jet improves the total effectiveness of the ventilated ceiling.Indoor air quality is enhanced in an energy efficient manner.

Energy conservation for operation theatres by secondary return air system

The traditional ways of maintaining cleanliness, temperature and moisture level in anoperation theatre (OT) usually use larger HVAC system and keep both the heating andcooling functions operating at the same time. The temperature and moisture level are thusunder control at the cost of tremendous amount of wasted energy. Incorporating the HVACsystem with the newly developed secondary return air system, the system capacity can bereduced while the energy efficiency can be increased. In this paper, concepts of the secondaryreturn air system are described.

Bewertung von Lüftungs-systemen mit der Spuren-gas-Analysetechnik Assessment of ventilation systems using tracer gas analysis methods

Today, tracer gas is used as a reliable means to examine various queries related to mechanical systems. Prerequisite is the safe and routine handling of the relevant analysis methods. Apart from some basic considerations, the present paper includes results of ventilation efficiency studies and a comparison of different systems on the basis of characteristic parameters.

Can we achieve energy efficiency and good IAQ in buildings?

Air-conditioning and ventilation systems, which help to maintain the indoor environment ofbuildings, account for more than half of the energy consumed in them. While it is necessary toimprove the energy efficiency of buildings due to economic and environmental reasons, it isimportant to do so without compromising their indoor environment. Various optimizingstrategies for air-conditioning and ventilation systems that help to improve energy efficiencywhile enhancing the quality of the indoor environment of buildings are described in this paper.

Energy efficient duct design and control of VAV systems: where is the fan energy savings?

Energy efficient operation of variable speed fans in Variable Air Volume (VAV) systems ishighly dependent on both the type of duct design as well as the type of control strategy thathas been implemented in association with the volume flow demand profiles of each individualzone in the building. The quantification of energy savings due to duct design and the effects offan control have generally been poorly understood, even with very simplistic types of controlstrategies, e.g. static pressure P + I control which have often been employed.

Potential economical benefits of balancing airflows in an office building

Earlier studies have shown that airflows are not well balanced in office buildings. This maylead to too low ventilation rates in some rooms and too high ventilation rates in others.Several studies have shown that low ventilation rates may lead to a higher prevalence of SBSsymptoms. The reduction of these symptoms may be achieved with improved ventilation.The purpose of this study was to evaluate the benefits of balancing the airflows of the airdistribution system of an office building in Helsinki.

The retrofit of respiratory isolation rooms for tuberculosis patients in Taiwan

In order to effectively control nosocomial infection 12 respiratory isolation rooms fortuberculosis patients in four hospitals have been built by the Energy & Resources Laboratories,Industry Technology Research Institute in Taiwan. This project was funded by the Center ofDisease Control of the Health Department. The performance of the air-conditioning andventilation/exhaust system of respiratory isolation rooms has been tested and validated. Thetested items include ventilation rate, static pressure, temperature, humidity and noise.