The purpose of this study was to find out the local intensity and extent of doorway draughts, the functioning of air curtains, and the variation of the neutral pressure levels in 18 industrial premises. The doorway draught can reach the whole workspace and all the employees. At the doorline, close to the doorway, the thermal conditions can be even harsher than those outside. Air curtains significantly decrease the fluctuation of the temperature at work sites, but the functioning of the same type of air curtain varied substantially between the buildings.
A 2x3 series of experimental conditions under ambient room temperature of 26 °C, two Personalised ventilation (PV) supply air temperatures of 20, 23 °C, and three levels of PV air flow rates of 4.5, 7.3, 11.2 L/s/person were conducted using tropically acc
The article describes the influence of the supply air devices that are part of hybrid ventilation system which is being developed within a EU funded project RESHYVENT as a part of this project, on thermal comfort in living-room of a three-bedroom apartment. The supply air radiator and the supply air convector are compared. The fresh air is sucked through a supply air convector and supply air radiator respectively and the air leakage through the facade is assumed too. 2 variants, which cover different outdoor temperature and supply air temperature for each device, have been solved.
In Arctic and sub-Arctic climates, such as those in Scandinavia, multiple-glazing windows that consist of at least three panes are widely used. Typically, the replacement air for the extracted air, especially in low-cost accommodation with forced extraction, enters the interior space in the form of leakage flow through the window jambs and the walls or through the supply air vents. The temperature for the air entering the room is close to that of the outdoor air, which may cause a sensation of draft.
The aim of this study was to find out the effectiveness of equipment used to prevent cold air flows in the wind boxes of commercial buildings and super markets. Measurements were carried out in 14 buildings at the total of 42 work sites. The effectiveness of the equipment used to prevent cold air flows in wind boxes was insufficient. The measurements showed that temperature changes and air flows can reach even beyond than 10 m from the wind box and create serious local draft at work sites.
The most carefully calculated and designed air conditioning installation will not be comfortable for the occupants unless the air diffuser is chosen correctly. It is the determination of the former which will enable a zone to have a homogenous temperature at all points and an absence of noxious draughts in the occupation zone. The classic large scale air diffuser therefore is the intermediary between installation of air conditioning and the premises to be conditioned. Discusses the role of the air diffuser in detail.
States that natural ventilation systems do not sometimes perform well in conditions of high wind and/or low external temperature. Occupants shut down the system to prevent draughts. In contract, in warm summer weather the lack of air movement is a problem. Hybrid ventilation helps mitigate some of these problems. The paper outlines problems in connection with hybrid systems and indicates solutions for them. Gives examples of hybrid system, some in use and some under construction.
In Scandinavia draught, cold and temperature changes are very general problems. About 50-70 % of responders in the questionnaires have reported about these adverse effects and this trend has increased during last decades. These problems are related to discomfort, accident risks and also indoor air quality. Reason behind problems in industrial buildings is mostly related to climate, draught at outer door openings and problems with ventilation.