Energy Efficiency Measure No. L 4.09
ADD PRESENCE SENSORS FOR BETTER LIGHTING CONTROL
COMPONENT CATEGORY: lighting control
ACTION TYPE: InstallARE
Energy Efficiency Measure No. L 4.09 ADD PRESENCE SENSORS FOR BETTER LIGHTING CONTROL |
| ENERGY SAVING AREA:
COMPONENT CATEGORY: lighting control ACTION TYPE: InstallARE |
Ritorna Pagina Principale Back to LIGHT List Torna a LISTA AREE di EFFICIENZA ENERGETICA
| DESCRIZIONE TECNICA | INFORMAZIONI SUI COSTI | PROCEDURE DECISIONALI e VALUTATIVE | INFORMAZIONI VARIE e COMMERCIALI |
TECHNICAL DESCRIPTION - descrizione tecnica
DESCRIPTION of the Measure (Suggested Action): Install a control system which adjusts the luminaires light output to maintain a constant illuminance. This is one of the most effective energy saving measure together with the replacement of old lamps with more energy efficient lighting sources.
TYPICAL APPLICATIONS: ECO Applicable in every kind of building, but particularly useful in office and commercial buildings
CAUTIONS SUMMARY and CONSIDERATIONS: Operation failures can be avoided by installing products with trouble-free guarantee and performance reliability. For instance, Occupancy Sensors that combines both Ultrasonic and Passive Infrared technologies into the same unit can provide reliable li9ghting control of areas that are difficult for a single technologies. The combination allows sensors to take advantages of both technologies while eliminating the weaknesses. The ultrasonic portion can provide high sensitivity to small movements, eliminating false offs. The PIR portion helps to eliminate false on problems. An Ultrasonic sensor is capable of detecting the movement of paper in a copy-machine.
PROBLEMS due to LACK of THIS ECO (Background): Electrical consumption is many buildings is excessively high because occupants forget to turn the light off after leaving the building. Oftentimes, the late night cleaning crew neglects to turn the lights off. This creates problem, since lighting remains on all the time regardless of occupancy lighting .
DISADVANTAGES: Sometimes unproper operation failures of sensors can switch off the light when people is in or viceversa.
COST INFORMATION - informazione sui costi
IMPLEMENTATION COST: Normal
O & M REQUIREMENTS AND RELATED COST VARIATION: Maintenance costs could decrease for reduced lamp replacement time interval.
REMARKS on COST FACTORS. Usually this is a very cost effective only when major interior renovation or rewiring is planned.
DECISIONAL & EVALUATION PROCEDURE TOP
IMPLEMENTATION STRATEGY: Sometimes the installation of the lighting control may imply also other major renewal costs. Therefore, try to avoid such costs, by installing simple, dual technology sensors. Above all, choose proper control type in relation to the type of occupancy.
IMPLIED ECOS: All ECOs related to lighting control and occupancy. Consider multi-level ballasts as an alternative control technique (ECO L.11). Consider switching functions along with other Energy Management System functions (ECO R.28). This measure is ususally applied together with ECO L.01 (improvement of lamps) and relamping.
ENERGY SAVING POTENTIAL:
It depends on the pre-retrofit situation (no. of light-on hours and on-time needs, type of lamps, power installed, etc.). Lighting loads in industrial installations can typically be reduced by 20 to 50% with payback times between 1-5 years. But there are also example of commercial buildings where savings above 70% had been obtained with payback times lower than 1 year.AUDIT & IMPLEMENTATION DECISION PROCEDURE: The audit for assessing the energy saving potential depends strictly on the type of occupancy.
ENERGY SAVING EVALUATION PROCEDURE: Preliminary evaluation requires comparison of actual energy use with reference/target values: alternatively, simply evaluate occupancy habits. For more detailed assessments, refer to Audit Procedure L.2 (lighting use monitoring).
Calculate the energy saved with the following formulas:
kWh-saved = P x (Hr0 - Hr1 )
where P is the Power of the Lighting System under measurement and Hr0 and Hr1 are the Light-ON time before and after the installation of the control system.
In case of combined application with relamping or improvement of lighting sources, with variation of the Power installed , the following formula can be applied:
kWh-saved = P x Hr0 - P1 x Hr1
where P0 and P1 are the Power levels of the Lighting System under measurement BEFORE and AFTER the retrofit.
The individual monitoring of each lighting point was till now prohibited by the size of the monitoring systems and their cost.
In order to overcome these barriers,
the Light-ON times can be measured by means of
a dedicated lighting logger called "Lamp Meter",
developed and commercialised by Enertech . This device is a very small
electronic data logger. Consequently it can be installed very near to any light
source without disturbance for the user. It has a light sensor to detect the
ON-OFF state of the appliance so there is no need to interrupt electrical
circuits for installation. The "Lamp Meter" is first fixed to the light source
and then
its sensor is directed so as to face the beaming light. A flashing LED tells the
installer that the devices properly sees the light.
The "Lamp Meter" is fully autonomous and can be left monitoring for as long as a year depending on the recording period. After the campaign, the data are downloaded to a PC for analysis. Finally, its very low cost makes it possible to equip all lighting sources in a site (One "Lamp Meter" per command point (switch..) is sufficient). This allows a complete study of the lighting consumption for each room, time periods, seasonal variations.
These data will permit to evaluate energy saving strategies and give precise information on their cost-effectiveness.
EX-POST ACCEPTANCE & PERFORMANCE COMPLIANCE CHECK PROCEDURE: The acceptance is made by checking the proper operation of the presence control device . Its sensitivity, time-response and field of operation should be adjustable, according to different situations.
USER INFORMATION and COMMERCIAL ISSUES TOP