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.
Solar Daylight Harvesting has become a buzzword in the energy efficiency world. In simple terms, it means using daylight to cut the level of artificial light that’s needed to illuminate an Industry / Manufacturing Units , Warehouses, offices ,Retail stores, Car Showrooms or any other workplace.The most efficient daylight harvesting systems are automated, and always check the level of the natural light present in an environment at any one time
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 in power generation through thermal energy due to ever rising costs and non-availability of coal, Solar Light Harvesting could provide much relief to a country like India by providing daylight in an unbelievably economical way.
How the system works?
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 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
A roof mounted system works with 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.
The 2 types of daylighting solutions available are:
- Pipe based solutions
- Ceiling Mounting – For maximum sunlight collection
- Wall mounted systems –alternative with horizontal setup
- Fiber Optic based solutions – provides more flexibility on light bends.