AIVC - Air Infiltration and Ventilation Centre

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Effect of ventilation system on particle spatial distribution in ventilated rooms

Airborne particulate matter has been implicated as a major contributor to the increased incidence of respiratory disorders among people working in livestock buildings. A clear understanding of particle spatial distribution can provide important information for improvement of ventilation system
design and control strategies. In this study, the dust mass spatial distributions in three different ventilation systems were measured using a multi-point sampler in a full-scale mechanically
ventilated laboratory room under controlled conditions.

CFD-based parametric study of ventilation and diesel exhaust in locomotive facilities

A CFD-based parametric study was carried out for a prototype general exhaust system widely used for ventilation and control of diesel exhaust in large enclosed locomotive facilities. The parameters of fan flow rate, ceiling height, fan spacing, and locomotive position relative to the fan were varied between two values representing the low and high ends of their expected ranges. A set of simulations was set up using factorial experimental theory, which allows variables and interactions having a significant effect on an outcome to be identified.

A gravimetric measurement method for ventilation cleanliness, before and after cleaning. Description and application.

The cleaning of HVAC systems aims at removing contaminants and re-establishing the function of the system of ventilation.A measurement method for ventilation cleanliness is discussed in this paper. It is based on measuring the dust deposits inside ducts. Comparison of that HVAC cleanliness method is made with others.

HVAC systems energy comparison for an office building

The use of different HVAC system types for office buildings has been analysed within the European funded project EECCAC. This paper presents comments on 7 analysed HVAC system types.Energy performance and consumption are studied in depth (electric equipment, lighting, cooling, heating, fans and pumps)

Dezentrale Lüftungsanlagen im praktischen Einsatz Decentralized ventilation systems in practice

The first part of this article insists on the importance of a good ventilation system (polluted air exhaust, humidity, filtration, VOCs exhaust). The second part deals with a test house, equipped with either decentralized or centralized ventilation system. CO2 and ventilation rate measurements being compared, the validation of a model for the determination of the indoor CO2 concentration levels in one room of the house has been made.

A BEMS assisted commissioning tool to improve the energy performance of HVAC systems

This paper is a presentation of a concept for a new automated tool that uses the capabilities of Building Energy Management Systems (BEMS). Some parts of the commissioning process can be automatized and can generate benefits over the whole life of a building.

Experimental Study on model-based commissioning method of VAV systems in a real building

A satisfying building commissioning depends on both using right models and using models right. Through 3 case studies, this paper shows how to use simulation models correctly, to commission HVAC systems.

A case study on the application of underfloor air conditioning and ventilation system in a school assembly hall

Floor return (FR) type underfloor ventilation system was installed in the assembly hall of aprimary school in Hong Kong. Experimental investigations on the airflow and temperaturecharacteristics were conducted. Pollutant distributions were also measured with different freshair supply rates. Results reveal that the use of low momentum floor supply panels reduced therisk of draught discomfort and created a more significant temperature stratifications comparedto those with fan boosted type floor air terminals. Ventilation of polluted air was localized upto the occupants breathing level.

Long-term monitoring of the performances of an innovative HVAC system for cinemas

In this paper, the results of the elaboration of the experimental data from 1-year longmonitoring of the performances of an innovative HVAC system installed in a multi-roomscinema of the Warner Bros Village near Venice is presented. This system is based on a rooftopexpressly designed for cinemas applications.The behaviour is analysed to verify the machine design choices in terms of reliability,energy efficiency and comfort level achieved. The study confirms the validity of the designwhich characterizes this HVAC system.

Quality of indoor air and functionality of ventilation in day care centres

The aim of the study was to develop solutions to the problems and deficiencies encountered inventilation systems of day care centres, and which were manifested as poor IAQ or excessiveenergy consumption in the buildings at the maintenance stage of their ventilation systems.During the afternoon rest hour the IAQ was monitored and other measurements of ventilationcapacity were made. The directors and maintenance personnel of the day care centres wereinterviewed and a questionnaire was presented to the staff.

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