Solar Daylighting refers to the thought of virtually transporting the sunlight into the four-walled buildings. These are possible with the engineering ingenuity of using advanced light trapping and enhancement systems.
Daylight Harvesting has become a buzzword in the energy efficiency world. In simple terms it means to manage the interior lighting of the buildings using natural sunlight supplemented with artificial lighting which can be automated based on the light conditions.
This kind of a system can be used in Industry / Manufacturing Units, Warehouses, Offices, Retail stores, Car Showrooms or any other workplace and even in households.
It is a very cost-effective, energy efficient way to bring benefits of natural light into any commercial establishment or any residential premises and drastically reduce the need to consume electricity generated by the main grid for lighting purposes.
At a time of escalating costs of lighting buildings, affordable natural lighting could provide much relief to a country like India by providing daylight in an unbelievably economical way.
The 2 types of systems used in Solar daylighting are
- Active Daylighting
- Passive Daylighting
Active Daylighting – In this system mechanical devices are used that actively capture the sunlight by tracking the sunlight and use it for distribution to building indoors or used for other purposes.
Passive Daylighting – In this systems common fenestration like windows, shades, floors, wall, floors and others equipment’s used to capture and distribute Sunlight into the interiors of the building. In this systems the equipment’s used are stationary and do not track the sun.
The two most commonly used Daylighting techniques are:
- Tubular daylighting
Each of the systems have their own pros and cons.
Skylights are special types of openings on the ceilings of the buildings covered with transparent or translucent materials to allow control the daylight entering the building.
There are different kinds of skylights based on the type of use, material and roof type.
The typical ones which we find are:
- Fixed Skylights – these are encased window casings that are fixed to the roofs to let natural light in. It doesn’t allow ventilation.
- Operable skylights – These are encased windows on the roofs that can be opened or closed to control the light and ventilation for the indoors.
Tubular Daylighting uses tubes to pipe in natural light from rooftops. These tubes reflect sunlight along the tubes to provide diffused light for the interior of the buildings.
How Tubular daylighting works?
The major components of the system include:
- Day lighting system – (a) Sunlight collector (b) light well (c) light diffuser
- Lighting control system- (a) Daylight sensor (b) Lighting controller (c) Central Control Panel
- Electrical lighting fixtures
There is the Light Collector on the rooftop which is a Polycarbonate dome consisting of two deflection panels sloping against each other. It is arranged to collect maximum sunlight during morning and evening times avoiding heat. The silver metal oxide used to coat the inside of the pipe reflects and re-reflects the light, till the light travels down the pipe and hits the Light Diffuser which controls the brightness based on the lighting requirement.
The daylight harvesting system provides daylight sensors measuring the ambient sunlight directly above the roof and giving feedback to the lighting controller that switches on required number of T5 or LED electric lamps to compensate for the reduction of daylight at task level.The central control panel measures the energy consumption in real time conditions to gauge the energy efficiency of the system.
To know more about our Tubular daylighting products please have a look at:
We also provide a variation of tubular daylighting : Ventilight – This is a LightPipe and Wind Turbo ventilator providing daylight to indoor spaces with air ventilation. To know more about it please check: https://www.lavancha.in/ventilight/