Sample Natural Ventilation Application Mechanical ... - TTMD

ArticleRoof U-value2.2 W/ m²KIndoor temperature - heating season 16°-26°CIndoor temperature - cooling season 28°-32°C (Split ornone)Indoor Air quality: Axial fan and natural directly fromwindow.Data of New BuildingWindow U-value 1.9 W/ m²KWall U-value0.35 W/ m²KRoof U-value0.25 W/ m²KIndoor temperature - heating season 20°CIndoor temperature - cooling season 26°CAs a result of measurements and associated loadcalculations, it is required to draw 2.290.000 m 3 /h of airthrough 125 exhaust aspirators with full load. Drawingsuch amount of exhaust (8 d/h) indicates the amountof fresh air required to inflow for air balance. Inflowingsuch amounts by conditioning will cause significantenergy consumptions, bigger devices will be requiredand thus problems related to the shaft height will occuraccordingly. As it is known that such exhaust rates donot always require, forcing air will be maintained in 3stages at peak moments.Air Handling Units1) Supply of fresh air by means of cellular ventilationand handling units with direct expansion, water-cooledcondenser, water heater battery and rotary heat recovery,which also used the air from atmosphere besides acidicand basic furnaces, WC, bath and kitchen.These units will meet their heating requirement fromthe boiler during the winter and meet their coolingrequirement from the DX battery during the summer,cooling units will be placed on top of them and coolingcondenser water of scroll compressors will be met fromclosed circuit cooling towers. Cooling units will be 407C– 410A. Forcing air will be able to operate with 100%outdoor air during transit seasons and in this case, theair will directly release out the exhaust. When required,it will be able to operate at night and proper outdoorconditions and summer load inaction of the building willbe taken out. Total clean air rate of these units is 466.880m 3 /h. Normally, this value is equal to 1.8 – 2.3 d/h airchange and 8-10 lt/s values. Fresh air is not exhaustedto the general volumes and therefore, workshops are leftunder negative pressure. This occurs for two reasons:*) Workshops prevent the release of precious metal powders.*) Preventing the release of production gas in an uncontrolledway.36Figure 1. Principle Scheme of Fresh Air FacilityTTMD 2013