Daylighting and Energy Usage

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A good daylighting system is the easiest and most cost-effective way to light a space and reduce energy usage. After all, the sun provides everyone with a lot of free light and energy every day, it makes sense to take advantage of it. However, placing just adding in skylights or windows without thought is a recipe for disaster; or really just some discomfort, but you get the idea.

An average grocery store might save about $16,000 per year in operating costs, or $0.32 per square foot with the use of an appropriately sized skylighting system.

 

Controlled Daylighting

hm-brown-daylighting-energy-usage-3To achieve reduced energy usage and save on operating costs the daylighting must be intentional and controlled. It is equally important to install and implement lighting controls. If the office worker or employee’s turn on the electric lights, there will be no savings.

Why are electric lights so expensive to run? About half of a light bulb’s energy consumption is released as heat, making them fairly inefficient. LED technologies are improving this percentage, but they still cost money.

Potential Energy Savings

A good daylighting solution will reduce overall energy usage of any building. For example, the potential savings for a few typical buildings in the Los Angeles area were calculated*. An average grocery store might save about $16,000 per year in operating costs, or $0.32 per square foot with the use of an appropriately sized skylighting system. A typical elementary school might save about $7,500 per year in operating costs, or $0.23 per square foot. An industrial processing and distribution center might save about $0.12 per square foot.

*Using 1998 energy costs, weather conditions from the San Bernardino Valley, and a few default assumptions.

Lakewood Mall Retrofit with Quadwall

Los Angeles area mall reduces glare and daily energy expenditure with CPI Daylighting’s Quadwall® panels

Bright spots, dark patches and solar heat gain plagued suburban Los Angeles’ Lakewood Center for decades, causing a rise in the mall’s HVAC costs and energy expenditure. In 2010, the then 60-year-old mall began a 4-phase renovation over the next four years that would replace 42,000  square feet of ageing plexiglass skylight with CPI Daylighting’s Quadwall® panels.

The number one advantage of the Quadwall is that there’s an insulating factor between the outside and the inside, which helps the climate control inside the mall because the right temperature can be maintained using less HVAC, since the renovation, we’ve cut the run time of the AC units by four hours per day!

Scott Cleveland, Operations Manager, Lakewood Center, Lakewood, CA

The skylights were installed 25 years ago when the roof was first put on the once open mall, but had leaked and cracked over time, holding a U-value of .73 when replaced. By contrast, the new CPI Daylighting Quadwall panels have a .22 U-value.

An assembly of two independent translucent insulated panels, the Quadwall system provides indefinite building envelope protection with its Removable Skin Technology (RST) that allows the exterior panel to be removed while still maintaining the integrity of the interior panel. Joined by a mechanically interlocking connection, the dry-glazed Quadwall system eliminates the need for vulnerable adhesives, adding durability, as well as even light distribution with the system’s tight-cell technology. Specified for Lakewood Center in 10 mm ice white matte exterior over 8 mm ice white matte interior, the two panel Quadwall system is an integrated, high-performance daylighting system.

With the Removable Skin Technology, we won’t have the same type of replacement challenges, plus the strength of the panel and the way it’s built makes a big difference too. In the long run, because of zero maintenance and CPI Daylighting’s warranty, costs should be very low on the maintenance side of it.

Scott Cleveland, Operations Manager, Lakewood Center, Lakewood, CA

Scalable, the Quadwall system can be configured with additional insulation, UL-rated Class A or B fire rated roof assembly, sound reduction, dynamic shading, additional structural performance or even military forced entry resistance as well.

Today, visitors to the Lakewood Center enjoy an enhanced shopping experience, as high quality light streams through the new CPI Daylighting Quadwall panels.

I definitely see a difference in the way the interior light looks from the old skylight to the new Quadwall. It’s much brighter without any glare. Now, that’s what we were looking to achieve!

Scott Cleveland, Operations Manager, Lakewood Center, Lakewood, CA

Saving Energy With a Good Daylighting System

Properly designed daylighting systems save energy and costs

Artificial lighting requires large amounts of energy and can represent as much as 50% of the electricity consumption of a building. Artificial lighting also generates a large amount of heat. When a good daylighting system is considered in the design phase the HVAC system can be reduced in size and operational cost will be lower.

Replacing artificial lighting systems with an effective daylighting system can reduce a building’s energy costs by as much as 30% to 70%. It is essential that lighting controls be utilized in a good daylighting system.  If the artificial lights are not turned off when the appropriate light levels are met the daylighting system is probably not saving any money on energy.

There are skylight manufacturers that tie the available daylighting into the lighting controls to always insure correct amounts of light and at the same time manage costs to avoid waste.