light harvesting systems
today it has very efficient resources to benefit from sunlight to illuminate work areas, even those who do not have windows. It tells collection systems daylight and reduce the insufficient electricity. Thus, with a complex system of sensors and controllers is achieved between 35 to 60% energy savings. To improve natural lighting, you can also use simple resources such as light shelves, a kind of inner wing reflecting sunlight onto the ceiling. Such strategies are especially suited to large spaces with many jobs .
For the architect Claudio Sevita, efficient lighting specialist, proper planning, control and use of natural light should be as important a factor as other design decisions. “We, today, with the possibility of using natural lighting sensors that measure the fluctuation of the input light through windows and skylights,” says Sevita. He explains that in Argentina, the concept of “daylight harvesting” (known as daylight harvesting) is not widespread: “The only elements that are usually incorporated in the professional field are photocells, occupancy sensors and a simple control lighting “lists. The ultimate goal is to maximize the natural light to save energy.
For that, you can develop an automatic control system that provides natural light levels and, according to the zoning of the plant, administered on and dimming of the lights. In addition to artificial lighting (lamps, ballasts, wiring and design layout of luminaires), the system must have a photo sensor that can be mounted on ceilings, walls or in the same fixture. This sensor measures the light level entering the space or on the work plane, and instructs the controller when a threshold has been advanced. turn, a controller, which may be a dimmable ballast or low voltage relay, receiving photosensor signal and issues a command to the controls or keys dimerization, adjusting the light output of the controlled system intelligently.
installation is completed with an occupancy sensor and digital sensor photo for “daylightimg” systems that continuously monitors the sunlight in the atmosphere. systems, open or closed type, measure the contribution of natural light on the work plane differently. Open censan only the incoming natural light, without the contribution of artificial lighting. The photosensor is installed outside the building or inside, near the openings. If it is a switching system, the photosensor instructs the lights to fade completely when natural lighting reaches predetermined levels. For a system with dimerization, the photosensor instructs the driver to dim the lights proportionally, based on the contribution of natural light. closed systems, the combination of natural and artificial light is measured, and adjust the light level luminaires in order to maintain the desired level of illumination.
The photosensor reads those changes generating a feedback (for this is a closed loop). “the advantage of open systems is that they are able to control multiple zones from a single sensor. Opposite closed, requiring that each zone is controlled by a photosensor. The level of investment and complexity depend on how ambitious the project, “admits specialist. Automate lighting is not the only way to save energy. Light shelves consist of a flap which is located in the upper third of the aventanamientos, above the plane of view. Its function is to receive direct rays about parallel to its floor, which has a high gloss surface treatment.
“The light bounces off the ceiling and into the back of the room to a ratio that is one and half times the height of the opening through which sunlight penetrates” details Sevita. has also developed a kind of blind metal rods, consisting of a series of ribs designed to collect natural light at all times of day and seasons and redirect the ceilings and hence the depth of the atmosphere. More sophisticated, Parans Swedish system is a light with a lens located outside the building. Follows the path of the sun and the light transmitted through optical fibers to the special fittings distributed in premises without openings.