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Inhalt archiviert am 2022-12-27

ENERGY SAVINGS FROM OPTIMUM DESIGN AND CONTROL OF LIGHTING IN OFFICE BUILDINGS

Ziel

Installation on five storeys of an existing office building of five different lighting systems. The consumers were questioned about appreciation of lighting systems and the current consumption for lighting was measured during one year, these figures were compared with those for one storey equipped with the old lighting system. Savings of 100 MWh and a payback of 3-9 years (new-old buildings) can be expected.
The different systems tried yield an energy saving of between 63% and 84% of the current consumption of the old lighting system.
The annual electricity saving was 132 MWh for the whole building, as an average for the five systems tried. The aim of achieving an annual saving of 100 MWh was thus "over-achieved". The overall saving calculated was 73%. The two most economical energy systems were those with individual lamps for each desk in conjunction with general lighting, and the system with fittings suspended above the tables.
Finalizing the systems involving automatic control of the lighting to suit the outside illumination proved difficult. There seems to be no adequate technology for this system on the market.
Questions to the occupant revealed :
That the lighting with automatic control in relation to the external illumination was not easily accepted by the occupants.
That the preferred new lighting systems were precisely those yielding the biggest energy savings.
That the occupants can express themselves as being satisfied with lighting conditions which lighting theory would consider bad (uniformity of lighting, reflections on the work surface).
The five new lighting systems had the following particular features:
The use of more efficient fluorescent lamps (tubes of 26 mm diameter instead of the old 38 mm ones). The fittings were arranged either to give general lighting or to provide a separate lamp for each desk, in combination with general lighting of lower intensity.
The general lighting can be controlled to suit the illumination from outside. This control can be operated separately for the inner and outer rows of lighting fittings, it is also fitted with a simple "off" switch and means of modifying the brightness.
One of the systems also includes an off switch triggered by a device that detects persons in the rooms.
The aim was to economize in the electricity needed to light the building, saving at least 100 MWh a year over the old system, i.e. a saving of 50%. (payback of the extra investment in three years for a new building, or nine years for an existing building).

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