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Maintenance and Commissioning
Published in Scott Dunning, Larry S. Katz, Energy Calculations & Problem Solving Sourcebook, 2020
To maintain proper air quality in a facility, outside air must be brought in while stale inside air is exhausted. Louvers that operate to control the flow of outside air have mechanical linkages that need regular maintenance.
Double-Skin Façade Case Studies
Published in Mary Ben Bonham, Bioclimatic Double-Skin Façades, 2019
Daylight quality and solar gain are controlled with automated blinds. The wide-slat, white-colored perforated louver blinds are controlled by the BMS in conjunction with a separate shading control system. The blind control protocol was based on a computer model using solar path data and shadows cast by the existing surrounding buildings.18 Temperature and light sensors are used to maintain optimal interior comfort and energy efficiency. A customized user interface allows each employee to control the shades in his or her vicinity.19 The louver blinds can retract fully out of view into the space formed by the slab upturn. The louvers are adjustable into horizontal (open), tilted, and vertical (closed) angles. Even when blinds are closed to prevent glare or heat gain, the louver blades at the top portion of the wall remain open, fixed in place as horizontal light shelves. A tensioned purlin cable guides the blind movement.
Silencers, Mufflers, and Active Noise Control
Published in Lewis H. Bell, Douglas H. Bell, Industrial Noise Control, 2017
Lewis H. Bell, Douglas H. Bell
The two principal features which account for the popularity of louvers are (1) ease of installation and (2) relatively low pressure losses, i.e., less than 1.0 in. of water for face velocities less than 1000 ft/sec. These louver units are usually available in modular sizes of 12-in. increments on each dimension. A bird screen is usually available as an option from the manufacturer and is strongly recommended for external (outside) wall installations.
Body force model for simulating airflow through dynamically oscillating louvers
Published in Science and Technology for the Built Environment, 2020
Biswaranjan Pati, Taaresh Taneja, Vaibhav Kumar Arghode
Louvers are an array of angled slats used at the exterior of vehicles, buildings, cooling towers, and refineries, among others, that allow air to pass through them while keeping out unwanted elements such as rainwater, dirt, and debris. Louvers are also used in the air outlets of air conditioners for directing the airflow to achieve desired air circulation in a room or automobile. Computational fluid dynamics (CFD) is a valuable tool for designing and analyzing an HVAC system, and modeling of air supply devices has been identified as one of the most important problems to predict the airflow distributions in buildings (Lemaire et al. 1993; Kassai 2017; Kassai and Simonson 2016; Kassai 2018). One way to simulate the airflow deflection from the louvers is to completely resolve the louver geometry (hence, referred to as the Geometrically Resolved [GR] model) and employ CFD analysis with appropriate boundary conditions. However, resolving all the geometrical features is computationally expensive and time-consuming. This is especially important for the case where the louvers are dynamically moved to effectively distribute the air. For simulating this case, dynamic meshing needs to be incorporated for a geometrically resolved model of the louvers, which further increases the computational complexity as well as the effort. Hence, we aim to develop a simple and rapid flow model for airflow through the louvers that obviates the need of geometrically resolving the louver geometry while mimicking the downstream flow characteristics.