This paper presents ventilation systems with longitudinal counterflow spiral recuperators. Heat transfer losses in ventilation system can be reduced by increasing the length of the recuperator, but in this case pressure drops increase. These two losses determine exploitation costs. Taking into consideration the results of measurements and calculations the costs for capital expenditure and exploitation of ventilation systems are minimized.
In this paper, the current situation of Portuguese residential buildings in terms of ventilation systems ispresented. The indoor air renewal is, normally, obtained by providing fresh air exclusively by air leakage of doors and windows and their occasional opening and exhausting the air through ducts placed in kitchens and bathrooms. A recent revision of the Portuguese standard NP 1037-1, concerning natural ventilation of dwellings, is studied and its influence upon heating energy consumption and indoor temperatures is reported.
The paper deals with on-site measurements of energy benefits resulting from exploitation of a solar greenhouse, which was created in the attic under the southward-oriented glazed roof for pre-heating of the ventilating air.This conception of the solar energy utilisation is used in the residential complex of the senior citizen home in Svitavy, 60 km north of Brno. Based on the data collected with the use of an automation monitoring system during the heating season 2001-2002, the main characteristics of the investigated solar greenhouse operation were established.
This paper presents an integrated damper and pressure reset (IDPR) method for variable air volume (VAV) system fan control. The IDPR method controls the static pressure at a minimum required level while maintaining at least one terminal box damper at full open position. When the entire system
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.
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.
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.
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)
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.
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