High Performing Buildings - Winter 2008 - (Page 31)

The Times Square redevelopment district requires a specified amount of exterior signage and lighting. rather than later; this helps everyone avoid making the same mistakes as the high performing building movement gains momentum. Deﬁning and Measuring Energy Performance Energy performance in buildings can mean many different things. Energy intensity, or energy use per unit of ﬂoor area, is one common measure of building energy performance. The U.S. Environmental Protection Agency (EPA) ENERGY STAR® building program, with its Portfolio Manager rating system, measures and compares building energy performance through adjusted energy intensity. However, energy intensity must be balanced against other performance criteria and project requirements—for example, a building with no lights, airconditioning or mechanical ventilation will have extremely low energy intensity, but will not adequately serve the needs of building occupants. Building energy performance can also be measured as compared to a threshold, usually with respect to an energy code or standard. While this is the most common metric used for new building energy performance, a building that has been designed to perform at a signiﬁcant reduction below the energy code may not compare well to a similar building where performance is measured by energy intensity. In addition, many earlier codes and rating schemes did not take process energy into consideration, deﬁned in ANSI/ASHRAE/IESNA Standard 90.1-1999, Energy Standard for Buildings Except Low-Rise Residential Buildings, as “energy consumed in support of a manufacturing, industrial, or commercial pro- cess other than conditioning spaces and maintaining comfort and amenities for the occupants of a building.” For example, many design teams will gather energy performance data for energy-efﬁcient buildings by comparing only the systems that the design team controls—such as envelope insulation value, percentage glazing, solar shading, chiller and boiler efﬁciency, fan and pump motor efﬁciency, installed lighting power density, and system selections. This excludes the process energy elements, some of the biggest Winter 2008 end users in new buildings, such as server rooms, lab equipment, cooking or restaurant equipment, security systems, building control systems, ﬁre safety systems, computers, printers, copiers and some plug loads. Many of these excluded loads operate 24/7; so while an energy savings calculation will state signiﬁcant energy savings, the real energy use of a new building may be much higher. These details need to be considered when setting goals and reporting both projected and actual energy performance. PERFORMING BUILDINGS 31 HIGH

Table of Contents Feed for the Digital Edition of High Performing Buildings - Winter 2008

High Performance Buildings - Winter 2008 Passing On the Gift: Heifer International Headquarters Head of the Class: University of Florida’s Rinker Hall How Far Can You Go? Pearl River Tower The Proof Is Performance: How Does 4 Times Square Measure Up? Lighting the Way: Two Guilford County Schools Montreal’s Retail Example: Mountain Equipment Co-op® (MEC)

High Performing Buildings - Winter 2008

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