High Performing Buildings - Summer 2009 - (Page 12)

E N E R G Y U S E C O M PA R I S O N Building Energy Use (Btu/ft2 · yr) Budget ASHRAE 90.1 – 1999 ASHRAE 90.1 – 2004 134,609 120,970 Proposed 78,830 78,830 First Year 51,979 51,979 59% 65% 41% 35% 39% 43% 61% 57% Proposed/Budget Savings First Year/Budget Savings FIRST YEAR ENERGY USE Electricity Month Mar-08 Apr-08 May-08 Jun-08 Jul-08 Aug-08 Sep-08 Oct-08 Nov-08 Dec-08 Jan-09 Feb-09 Totals kWh 28,676 20,278 16,556 18,239 24,356 24,356 21,270 18,988 18,508 17,560 20,548 23,068 252,403 Btu 97,846,527 69,191,375 56,491,390 62,234,021 83,106,082 83,106,082 72,576,218 64,789,714 63,151,887 59,917,178 70,112,653 78,731,084 861,254,211 Btu/ft2 3,096 2,190 1,788 1,969 2,630 2,630 2,297 2,050 1,998 1,896 2,219 2,491 27,255 Therms 1,758 145 519 241 0 0 80 271 1,513 691 1,364 1,232 7,813 CCF 1,734 143 512 237 0 0 79 267 1,492 681 1,345 1,215 7,705 Gas Btu 175,827,000 14,500,000 51,916,000 24,082,000 0 0 8,010,000 27,073,000 151,288,000 69,067,000 136,364,000 123,167,000 781,294,000 Btu/ft2 5,564 459 1,643 762 0 0 253 857 4,788 2,186 4,315 3,898 24,724 polyolefin membrane with a calculated R-value of 37. The exterior glazing is 1 in. insulated units with a low-emissivity coating to increase the R-value and control heat gain. The punched windows and sanctuary clerestory are composed of two 0.25 in. glass lites with a ½ in. air gap and a low-e coating for a wintertime U-value of 0.29. The glazing at the exterior curtain walls is similar, but includes a pane of spectrally selective gray glass. The result is a decrease in visible transmittance, but with an increased shading coefficient and solar heat gain coefficient of 0.32 and 0.28, respectively. 12 HIGH PERFORMING Lighting The interior lighting integrates the architectural planning and the latest technology to reduce energy consumption and improve the quality of the indoor space. The building plan places more than 90% of the occupied spaces on the exterior with access to daylight and views. Solar tubes help illuminate the third-floor kitchen and reception spaces. To complement the natural sources, more than 90% of the fixtures use T5 fluorescent lamps, and more than 50% are indirect/direct pendants. The project also incorporated other longlife, energy-conscious light sources including cold cathode and LED. Summer 2009 Lighting controls include a combination of occupancy sensors, photocells, mesh shades, dimming and dual lamp switching. The artificial lighting in the sanctuary and ceremonial stair is controlled by photocells. In the sanctuary, full dimming capability and photocells work together to maximize daylight harvesting. In most other spaces, occupancy sensors control the lights. In the classrooms, two dual-switched lamp fluorescent fixtures provide a simple, cost-effective means to respond to the natural light. The site lighting around the building consists of only four exterior fixtures, all with full cutoff BUILDINGS

Table of Contents for the Digital Edition of High Performing Buildings - Summer 2009

High Performing Buildings - Summer 2009
Contents
Commentary
Jewish Reconstructionist Congregation
Designing Efficient Lighting
CSOB Headquarters, Prague
U.S. Homeland Security, Omaha
Stellar Commercial Building
Advertisers Index

High Performing Buildings - Summer 2009