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CO-OP SAPPORO, a consumer cooperative with a total of over 1360,000 members, has boosted its environmental activities since 2008 and has promoted a wide range of efforts, including waste reduction and recycling.
As part of these efforts, the cooperative has promoted a new store development project, setting as their target the halving of CO2 emissions by focusing on specially-planned construction and operation of the store.
The organization engaged in joint research with the Muroran Institute of Technology. The completed store utilizes the energy conservation technology developed through research and the use of solar energy and the adoption of laminated larch wood produced in Hokkaido. One of the challenges in this project was to reduce the power consumption of refrigeration and lighting equipment without inconveniencing customers.
Placing the right type of lighting in the right place, can save energy. At the CO-OP SAPPORO Nishimiyanosawa store, we have introduced eco-friendly lighting on the shopping floor, LED downlights under the eaves, and LED lighting above cash register. We have installed illumination sensors on the ceiling in order to automatically control brightness according to brightness outside. Moreover, we have adopted CFC-free freezer showcases that reduce power consumption by approximately 10% compared to conventional freezers using HCFC refrigerant. Equipment of high energy-saving efficiency has been introduced throughout the store. Additionally, in an effort to achieve the ultimate in eco-friendliness, we have pursued more advanced ideas for down the road.
Light leaked from showcases is also perceived by customers as brightness. For that reason, we have set the goal of "dramatically reducing wasted light by controlling and coordinating lighting equipment and showcase lighting, and allowing showcases to change temperatures according to the outside air temperature and the temperature inside the store, thereby achieving further energy conservation." We proposed a control system that linked lighting and showcases, by making use of the know-how available at Panasonic's test store. Careful control has led to a reduction in power consumption of approximately 40%*.
Even if energy conservation is achieved, it is meaningless if sales drop because of insufficient brightness on the shopping floor. Is the store bright enough that fresh foods look fresher than they are and lure customers to pick them up? Is the brightness appropriate for elderly people? We have thoroughly verified these matters, not just based on luminance but by using "Feu," Panasonic's original brightness-level index. Moreover, we asked customers to cooperate in a sensorial evaluation. This is how an eco-friendly supermarket, designed from the customer's viewpoint, was created.
Various tasks remain for Panasonic to implement in the next step, including the creation of a more pleasant shopping floor by changing the color temperature of lighting in each zone and visualizing excess light in detail. This task will be accomplished by measuring energy consumption by each piece of equipment. We have proposed wireless systems for transmitting data from various sensors, as well as systems using a cloud service that allows energy management from remote locations. Our goal is to offer even more eco-conscious solutions by spreading energy management to all 111 CO-OP SAPPORO stores.
Panasonic's 24/7 remote monitoring system makes it possible to monitor not only electric power consumption but also the temperatures and humidity of refrigeration equipment and store interior. Additionally, it logs historical data. This allows us to identify electricity waste and enhance product quality controls. Power-savings and food safety are both achieved at the same time. Furthermore, we offer sensors, such as CO2 sensors that help determine the number of people in the store based on their breathing, illumination sensors and thermo sensors. And, by providing devices for data confirmation, such as PCs, monitors and smartphones, we can build the entire system.
This is a new lighting index that quantifies the brightness that people sense in a space. Currently, the lux, a unit created 120 years ago, is used as the standard measure of lighting brightness. It indicates the brightness of illuminated plain surfaces. In general, it expresses the brightness of horizontal surfaces such as floors or desks. However, when we view a space, we not only look at the floor but also the ceiling or walls. The Feu is an index that quantifies the brightness that we sense in a space by comprehensively assessing the effect of the light that illuminates the walls or the light reflected from the floor.
Color temperature does not refer to the temperature of the light source but quantifies the color shade of the light. Kelvin (K) is used to indicate the color shade. The lower the color temperature, the redder or warmer the color, and the higher the color temperature, the bluer or colder. The color temperature of daylight on sunny days is 5,500 - 6,000 K and that of incandescent bulbs is around 2,800 K.
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