Underground parking lot lighting fresh air

Now, some large scale underground garage using a new kind of LED lighting system, practice has proved that compared with other types of underground garage illumination system, this system has a unique advantage.

the characteristics of this new type of lighting system is: use the LED lamps, required electric power system is mainly composed of photovoltaic roof system provides, met rainy day in a row, lack of power from the mains supply.

the LED as a semiconductor light source, its superiority embodied in the low voltage dc power supply, and can be flashing light without damage to these two aspects. So, LED and low voltage, dc power supply used as underground garage lighting effect is best.

economic benefit analysis of the price of photovoltaic (pv) power supply of the underground garage lighting system is a system to calculate, in area of 20000 m2 of the underground garage project as an example, the traditional lighting electric cost: 50 yuan/m2 * 20000 m2 = 1 million yuan, According to 50 yuan/m2) Photovoltaic battery powered LED lighting cost: 2. 6 million yuan incremental investment cost: 2. 6 million - To save electricity (1 million = 1. 6 million yuan The project according to the traditional lighting design 4. 8W/m2） : traditional lighting electricity: 4. 8 x 20000 w/m2 m2 * 365 days * 24 h / 1000 = 63, 75%. 0. 72 million kWh after power is supplied by photovoltaic cells, the entire lighting system power consumption 10% provided by the grid: 63. 0. 72 million kWh x 10% = 6. 0 30000 kWh on commercial electricity prices. 8 yuan/kWh calculation, save electricity: (every year 63. 072 - 6. 3) KWh by 0. 8 yuan/kWh = 45. 40000 yuan incremental cost recovery period is: RMB 1. 6 million / 45. 4 ( RMB ten thousand/year) = 3. 5 years

it is important to note that some issues need to be paid attention to by some of the underground garage lighting system, has installed a photovoltaic cells on the roof of a building, but chose the inverter grid way ( Through the inverter will pv cells connected to the grid, excess power grid) 。 Such a system, even in the load in the application of LED lamps and lanterns, also is totally two different technologies of simple together, not integrated design. The pv applications and semiconductor luminescence of the technical scheme of 'fragmented', seemingly simple, but cause quite a lot of trouble to hospital.

in the first place, the photovoltaic inverter system battery into the high voltage danger zone, make the roof of a hospital near the drying sheets will cause accident getting an electric shock; Secondly, inverter harmonic serious interference medical, diagnostic instrument.

although the grid photovoltaic power station without battery is relatively simple, but in this system is used in the LED must not very ideal, because takes step-down rectifier to drive LED lamps and lanterns, efficiency is very low, lead to the LED soon decay.