85. Energy-Saving of Office Building Lighting-orchestra (TM)
21% of the total electric power consumed in buildings is consumed by lighting. When limited to working areas alone, this increases to 40%. Lighting is the single largest opportunity for improving energy efficiency in buildings. In addition, Japan’s plan to cut CO2 emissions by 2020 has an initial goal of reducing CO2 emissions from buildings by 31 million tons. Newly-constructed buildings are already equipped with energy-efficient air conditioners, elevators, escalators, and other energy efficient systems, so the immediate focus for this program is on how to expedite the renovation of existing structures and office buildings in particular. This will be accomplished using Building Energy Management Systems (BEMS) that are designed to supervise the energy consumption of the entire building. Our product, called Lighting Orchestra, is a powerful BEMS add-on that enables a dramatic reduction in lighting costs.
Lighting Orchestra uses wireless communication, simple sensing technologies, and control features to reduce energy consumption in buildings. The system uses a controller, dim units, and auxiliary wireless terminals to network ceiling lights and achieve a remarkable reduction in power consumption by dimming individual lights to a sufficient yet energy efficient brightness level.
Wireless technology makes it possible to connect all the lights to the network without setting up troublesome cable connections between them. Most modern LED lights have an interface terminal for dimming. The Lighting Orchestra dim unit can be easily connected to this terminal and can be placed anywhere on the ceiling near the light. The solution offers a huge advantage to companies converting existing ceiling lights to energy-saving LED lamps. Of course Lighting Orchestra is effective for newly-built buildings as well. An estimate of the construction cost of lights covering 20,000 m2 of floor area shows that Lighting Orchestra can save developers ¥200 million ($2.2 million) over the usual two-wire communication link.
The system controller is the core component of Lighting Orchestra and is installed on the wall. It communicates not only with the dim units connected to each light but also with various other terminals such as watt meters and body/motion sensors for data logging and control. It communicates with the BEMS (Building Energy Management System) through an Ethernet connection, making possible such tasks as remote monitoring and visualization of power consumption and remote dimming for urgent power reduction requests.
In conventional automatic dimming control systems, many sensors are needed to evaluate the illumination distribution over the area of control. Though such systems enable precise control of the illumination level by following the change in daylight intensity, the illumination sensors that must be placed on desks can be cumbersome and the cost of adding numerous sensors can prevent the system from being properly implemented. Lighting Orchestra estimates the suitable dimming level for each light without the use of external sensors. The Lighting Orchestra controller includes a built-in sensor for measuring illumination and the changes in daylight intensity.
The system works like this: Assume your office has 64 ceiling lights in rows and windows opening to the south. On sunny days, lights on the window side will be turned off. Lights closer to the interior of the room will be set to a brightness level that increases the further they are from the windows. The lights will be set to a different dimming pattern on rainy afternoons, but as the sun sets, the pattern will be adjusted to an evening pattern. The evening pattern, which is not affected by the rain, will be consistent whether rain or shine. The system controller stores these various lighting patterns. The patterns are developed through experimentation and experience. The controller chooses the best-fit dimming pattern and makes small adjustments to each of the 64 lights by using the internal sensor and other information.
Replacing fluorescent lamps with LEDs will result in a 30% reduction in power consumption. The individual dimming based on daylight intensity achieved by Lighting Orchestra will more than double this. Furthermore, compared to typical uniform lighting, Lighting Orchestra brings about power savings of about 18% even at night. This is because light reflected from wall surfaces leads to excessively bright areas if all the lighting is uniform; smoothing the illumination by dimming individual lights results in significant power savings. In addition, when lights are dimmed, the LED lamps work at considerably lower optical output, which significantly lowers the temperature of the LEDs and extends the life of the lamps.
A single Lighting Orchestra system can cover area with a maximum radius of 40 m. The coverage area can be extended to an unlimited size by using zoning. Zoning involves keeping the wireless network of each zone independent by assigning it a different radio frequency band and a unique 16-bit system ID. Furthermore, the zone size will be expanded when the existing 2.4GHz radio is replaced with the 920MHz radios coming soon.
In the past, the simple replacement of fluorescent lamps with LEDs has sometimes led to excessive power reduction at the cost of a comfortable working environment. Lighting Orchestra enables both power savings and a comfortable working environment. In addition, the networking and bilateral communication features of Lighting Orchestra are not limited to the dimming control of lights in the office. In the future, sensor data will also be able to be shared and used for controlling air conditioners and security devices and for many other purposes.
Why it should be recognized:
Lighting Orchestra offers a powerful means for reducing the amount of energy consumed by lighting in office environments. With up to 21% of building power consumption attributed to lighting, Lighting Orchestra has the potential to reduce total overall power consumption nationwide by as much as 1%.
Lighting Orchestra’s wireless technology platform makes it possible to connect all the lights in an office building to the network without prohibitive wire installation costs. This makes Lighting Orchestra an excellent option for existing buildings and offers amazingly low cost of installation.
The system controller, the core component of the Lighting Orchestra system, is designed to work with various kinds of building energy management systems through an Ethernet connection. Therefore, it is not simply a power saving system for lighting but will also play an important part in the overall energy management system. Data and control message exchange with equipment like air conditioners and security systems can also be assigned to Lighting Orchestra.
HAKUTSU Technology collaborates with companies such as LED manufacturers, electrical contractors, builders, and BEMS suppliers who are working to solve energy problems worldwide.