CASE STUDY

Commercial Office Building

Rockford, Illinois

In order to scientifically and precisely verify the energy-

saving properties of energy-control window film,

CPFilms Energy Solutions Division joined forces with a

leading national Energy Service Company (ESCO) to

mount a clearly defined and controlled research trial.

The location and duration (twelve months) of the trial

were deliberately chosen to demonstrate energy

savings in both cooling and heating seasons in a

cool climate. This trial also clearly demonstrated that

energy-control window films are not a ‘warm-climate

only’ product. In early 2002, LLumar

®

E-1220 Low-E

solar control and insulating film was installed on an

eight-story commercial office building near Chicago

(Rockford, Illinois). The building has a conditioned

space of 59,000 square feet and its windows are

single-pane bronze tinted glass. Heating and cooling

is provided through all-electric room unit ventilators.

Prior to film installation, CPFilms created a computer-

driven model which simulated energy savings, using

the U.S. Department of Energy analysis method

(DOE-2) to serve as a benchmark.

The independent ESCO test made use of a methodology fashioned by IPMVP Inc. (International Performance

Measurement and Verification Protocol), a worldwide non-profit organization which develops products and services

to aid in the measurement and verification of energy savings from energy efficiency projects. During the twelve

months following film installation, IPMVP measured energy savings of 8.8% were noted, yielding a 3-year payback.

This compared favorably with the simulated DOE-2 analysis which had shown 8.4% energy savings and a return of the

initial investment within three years.

The analytical experiment unquestionably demonstrated that substantial energy savings can be obtained through the

installation of energy-control window film with the reasonable expectation that

initial installation investment can be cost-effectively retrieved. Moreover, energy

savings can be accurately predicted using DOE-2 computer simulation

methods. For more detailed information concerning this case study, please

send an email to EnergySolutions@CPFilms.com

ENERGY SAVINGS SCIENTIFICALLY VERIFIED

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