Ecobuild 2014: Lighting and energy management
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Over the past few years, the design and construction community has been engaged in an ongoing conversation about all things daylighting. Designers have been faced with stringent design practice and problems, emerging building codes and green building protocols. Recent revolutionary technology has emerged to give specifiers the tools to better control the light from the sun and hence realize reported productivity gains and equally importantly, deliver energy savings. The presentation will cover the symbiotic relationship between automated shading and automated lighting control systems and by controlling daylighting, will achieve a comfortable work environment which can also deliver significant energy savings. Talk by David Robinson, ACIBSE MSLL
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Ecobuild 2014: Lighting and energy management
- 1. Daylighting and Energy Optimization with Automated Blinds
- 2. The idea
- 3. Why the limited application of Automated Roller blinds
- 4. Fear-factor The majority of automated rolleror venetion blind control systems installed in the UK do not work or have been switched off!
- 5. The Challenge The illuminance of direct unobstructed sunlight is approximately 100,000 lux The Goals • Thermal Comfort • Visual Comfort • View to Heat & Glare
- 6. There can be no sustainability without energy savings, there can be no energy savings without a daylighting strategy, there can be no well informed daylighting strategy without an automated shading system.
- 7. There can be no sustainability without energy savings, there can be no energy savings without a daylighting strategy, there can be no well informed daylighting strategy without an automated shading system.
- 8. There can be no sustainability without energy savings, there can be no energy savings without a daylighting strategy, there can be no well informed daylighting strategy without an automated shading system.
- 11. “The overall intent is to keep the blinds up as much of the time as possible without causing thermal or visual discomfort”
- 12. Maintaining Visual Comfort by managing Contrast Ratios
- 17. “Automated” systems are rendered useless if local climatic conditions are not considered
- 18. Manual blinds tend to act like a broken watch Only effective once a day!
- 19. Manual Blinds: • Non-uniform façade • Loss of energy saving opportunity
- 33. Why?
- 34. Need a automated blind control system that can be Measured and Verified
- 35. Energy Saving Potential: Automated Blind Control working with Automated Lighting Control
- 37. . . . allowing dimmable lighting to supplement the optimized daylight condition. The two systems interact though daylight
- 38. Manage the Quality and Quantity of natural light entering a building Enhance the opportunity to dim the lighting system and save energy
- 39. Thank you
Editor's Notes
- Rather than being exclusively a shading company, we have grown up into something much more. We really see ourselves as a daylight harvesting company, who just so happen to accomplish this thing through scientifically-engineered shading devices and technologically-advanced, elegantly-controlled systems. Our goal, then, is to harvest as much natural daylight as possible without allowing the direct solar ray to cause visual or thermal discomfort to the building occupants. The electric light then, is used only as needed to supplement the natural daylight. We want to keep the shades as high as possible, in order to keep the lighting as low as possible. This Big & Bright Idea informs all that we do. In order to maximize the daylight harvesting intent of a software driven, dimmable lighting control system, the design team must first look at maximizing the use of natural light. In order to maximize the use of natural light, the design team must consider how to protect the occupants in the occupied zones from debilitating glare and heat. The automated shades need to stay up as long and as high as possible to allow natural light to filter into the space, and the dimmable lights to switch off or dim down. The only way to achieve the maximum lighting and energy savings, is to start w/ a true automated shade system that understands the real time microclimatic conditions affecting the building, and the occupants in the occupied zone.
- 870,000 miles in diameter and having a surface temp of 11,000 degrees F, the sun presents its challenges. The illuminance of direct sunlight is approximately 100,000 lux. The challenge then, is to take this amount of sunlight and control the direct ray so that approximately 350-450 lux fall on a work surface. Uncontrolled daylighting will often result in excessive heat gain and debilitating glare and luminance. The goals of controlled daylight are thermal and visual comfort, while maintaining a view to the exterior.
- A simple rain gauge on that system costing less than $30 would prevent the sprinklers from coming on when it is or raining or has rained in the past 24-48 hours.
- A simple rain gauge on that system costing less than $30 would prevent the sprinklers from coming on when it is or raining or has rained in the past 24-48 hours.
- . . . we need “data” or “sky analysis” in real time
- . . . we need “data” or “sky analysis” in real time
- . . . we need “data” or “sky analysis” in real time
- . . . we need “data” or “sky analysis” in real time