All of efficient control strategies in a building are marked by a good read of useful variables to launch actions aimed at energy efficiency. Two of the most important are: control presence and/or movement of people in an area and the brightness level present therein.
KNX Presence and Brightness Sensors are responsible for providing these data integrated into the control mechanism associated with the threshold where you want to perform a control action help achieve strategies LEED by controlling systems that directly affect the consumption of resources a building.
These sensors capable of measuring more than one variable, have much influence on the achievement of strategies LEED as an action launcher once parameterized how to act the system to be controlled (lights, air conditioning) when a control threshold is exceeded ( continued absence at the time of people in the area, high brightness level of natural light, ...).
Have far more than one variable in the same product, can minimize the number of elements necessary for the control, which reduces the cost of implementation of each project of sustainable construction. The diverse range in this type of product is wide, and the specialization of each product within the same family, either installation location (ceiling, wall), size (large, small), control area (big space areas sensitive detection , limit areas within the same sensor on each surface) and aesthetic (placement flush with the ceiling, wall integration mechanism).
LEED STRATEGIES INFLUENCE
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A.1. Maintain site lighting to prevent light pollution
Savings from lighting according to requirements
The interior lighting systems, which are a source of light pollution, using KNX Presence and Brightness Sensor, can be regulated to try minimise their impact on the building's exterior. This can be achieved by means of constant regulation mechanisms, for example, that minimise artificial lighting by making the most of the natural light available.
Similarly, switching off lights automatically due to a lack of presence decreases the consumption, and at the same time it prevents an unnecessary radiation of light to the outside.
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Energy & Atmosphere
C.1. Use free energy
Energy savings in lighting
With regards to the use of natural light in the building, the control systems optimise the use of artificial lighting, controlling automatically by means of KNX Presence and Brightness Sensors that regulate the intensity of artificial light sources, as discussed in strategies E.5 and E.7.
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Materials & Resources
D.1. Design smaller, more flexible homes and buildings
Buildings can be designed more rationally to save energy
Traditional sensors and probes may be replaced by multifunction sensors to perform much more accurate and integrated control mechanisms with fewer elements, using multisensors that are able to measure several variables and keep track of multiple systems like KNX Presence and Brightness Sensors, capable of measuring more than a magnitude on the same device, some even with temperature probe included. With separate virtual channels for lighting control, alarm or weather.
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Energy & Atmosphere
E.4. Give occupants temperature and ventilation control
A regulated control of each zone means one can adjust the energy use, as there are different HVAC requirements
Presence Sensors can be integrated into the HVAC system control, based on mode changes due to presence (e.g. switching to comfort mode when detecting the presence of users in the zone of the sensor) or a prolonged lack of presence (e.g. changing to night mode if a lack of presence is detected for 30 consecutive minutes).
This is done to limit the users’ incorrect actions, as the climate behaviour is normalised in each area (different setpoint ranges can be defined for each mode depending on the intended use), which ensures flexibility for change in each zone.
E.5. Give occupants lighting control
Avoiding the use of lighting in empty rooms implies saving a considerable amount of energy
The presence control system, based on appropriate sensors and their positioning, is responsible for limiting or correcting users' incorrect actions, shutting down the lights in an area if there is no presence for several minutes or hours, depending on each case. In addition, these sensors are responsible, in certain areas like hallways, stairwells, common areas and toilets, for automatically switching on the rooms where there is presence or movement of people
Presence and motion sensors can be integrated in the lighting control system, based on automatic lighting in walking or common areas (e.g. switching on lights on stairs) or progressively switching off when there is a lack of presence for a certain time (e.g. switching off lights in an area without presence for 2 hours).
Using the adequate and necessary amount of light helps to reduce lighting-related energy expenditure, which is usually quite high
If the interior brightness average is available via sensors, it is feasible to adjust the artificial light depending on the amount of natural light. The control system is able to perform this type of constant light adjustment in response to the defined comfort and usage policies.
The constant light adjustment may be achieved with brightness and presence sensors and the proper programming in the control system, which has to take into account the placement of these sensors in relation to the artificial light source and the natural light, and measure the combination of both, to calibrate the measured effect and to perform a more precise control.