International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 1801 An Environmental Quality Assessment: Study on Natural Ventilation in Buildings Arun Kumar Yadav 1 , C. P. Maurya 2 1 M.Tech Student, Structural Engineering, Faculty of Engineering & Technology, Rama University, Kanpur, India 2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering & Technology, Rama University, Kanpur, India ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Natural ventilation is outlined as victimization passive ways to provide outside air to a building’s interior for ventilation and cooling. Conventional commercial buildings with airtight envelopes are typically conditioned with mechanical HVAC systems. Although airtight envelopes contribute to energy efficiency, introducing fresh air through natural ventilation strategies can both save energy and improve indoor air quality. With correct style, appropriate to the building location and use, natural ventilation can replace all or part of a mechanical system, thereby reducing construction, energy and operating costs. Natural ventilation systems believe natural driving forces, like wind and temperature variations between a building and its surroundings, to drive the flow of recent air through a building. Both work on the principle of air moving from a air mass to a unaggressive zone. Key Words: Ventilation, Air Ventilation, Indoor Air Quality, Natural Ventilation, Analysis, Energy Efficiency, Modelling 1. INTRODUCTION Indoor environment in a room has to meet level suitable for people and theirs activity. Ventilation is one of systems keeping habitable environment. It requires air flowing between interior and exterior and it provides exchange of polluted air for fresh outside air or clean air from neighboring rooms. Thus it is necessary to start and maintain air flow according to requirements in a ventilated space. Ventilation promotes and directs air movement in the space, removing excessive heat and/or moisture essential for comfort and well-being. In industrial building ventilation requirements may relate also to industrial processes. In an agricultural building all focus aims to animals. Natural ventilation could also be outlined as ventilation provided by thermal, wind or diffusion effects through doors, windows, or different intentional openings within the building as against mechanical ventilation that is ventilation provided by automatically powered instrumentation like motor-driven fans and blowers. Although some in the India may think of natural ventilation as merely which means operable windows, natural ventilation technology has been advanced in recent years in Europe. 2. Categorization of Ventilation Generally categorization of ventilation is done on the basis of:  Wind induced  Driving forces 2.1 Single-Sided Ventilation Single-sided ventilation generally serves single rooms and so provides a neighborhood ventilation resolution. Ventilation airflow in this case is driven by room-scale buoyancy effects, small differences in envelope wind pressures, and/or turbulence. Consequently, driving forces for single-sided ventilation tend to be relatively small and highly variable. Compared to the opposite alternatives, single-sided ventilation offers the smallest amount engaging natural ventilation resolution however, however, an answer that may serve individual offices. Single-sided ventilation can be useful for single rooms as it provides a local ventilation solution. 2.2 Wind-Driven Cross Ventilation Wind-driven cross ventilation occurs via ventilation openings on opposite sides of an enclosed space. The building floor plan depth in the direction of the ventilation flow must be limited to effectively remove heat and pollutants from the space by typical driving forces. A significant difference in wind pressure between the inlet and outlet openings and a minimal internal resistance to flow are needed to ensure sufficient ventilation flow. The ventilation openings are typically windows. 2.3 Stack Ventilation Buoyancy-driven stack ventilation depends on density variations to draw cool, outside air in at low ventilation openings and exhaust heat, indoor air at higher ventilation openings. A chimney or atrium is frequently used to generate sufficient buoyancy forces to achieve the needed flow. However, even the smallest wind will induce pressure distributions on the building envelope that will also act to drive airflow. Indeed, wind effects may well be more important than buoyancy effects in stack ventilation