High Performing Buildings - Fall 2013 - (Page 22)

Energy Savings (%) Photo by lin Ho. Courtesy of Senandung Budiman Sdn. Bhd TA B l E 1 E n E r G y U S E ModElEd EnErGy S AV i n G S the occupants’ visual comfort, various daylight simulation exercises were conducted to verify that daylighting would be adequate and well distributed. lighting 53.6 Energy Efficiency Air-Conditioning Plant 47.1 Air-Side Fans 90.9 Mechanical Ventilation 10 Elevators 10 Domestic Water System 30.3 Garage lighting 60.2 Total Building Energy Consumption (with PV) 46.1 The design building energy intensity (BEI) was 27 kBtu/ft2 · year (85 kWh/m2 · year), representing a 65% reduction compared to a typical office building in Malaysia with a BEI of 79 kBtu/ft2 · year (249 kWh/m2 · year). Energy simulation was performed with IES Virtual Environment software conforming to ASHRAE Standard 140-2004 and Standard 90.1-2007 (Tables 1 and 2). Energy efficiency performance of the building recorded for the period from October 2010 to November 2011 is depicted in Figure 1. The actual BEI of 20.6 kBtu/ft2 · year (65 kWh/m2 · year) has surpassed the design target to achieve an annual energy savings of more than 70%. Note: Energy savings derived from reference model based on compliance with Malaysian Standard 1525:2007 with building energy intensity (BEI) of 64 kBtu/ft2 · year instead of a typical office BEI of 79 kBtu/ft2 · year. See note in Energy at a Glance (right) for definition of building energy intensity. While the building may appear to be fully glazed, metal cladding replaces the exterior glazing for the first meter of each floor. Using glazing for this lower wall section does not serve any notable purpose in terms of energy efficiency and daylighting. Extensive computer simulation of the diamond form was conducted to ensure that the building performed as designed in regard to daylight levels and energy use. To maintain HVAC System The Diamond Building is designed to provide thermal comfort using the following strategies: • Floor slab radiant cooling addressing the sensible load of the air-conditioned space; and TA B l E 2 C o M pA r i S o n o f E n E r G y C o n S U M p t i o n A n d C o o l i n G l o A d , oCt 2010–SEpt 2011 Total Electricity Total Electricity with PV (kBtu/yr) (kBtu/yr) Total Cooling load (kBtu/yr) Proposed Model 3,746,738 3,479,977 7,514,732 Reference Model 6,462,342 6,462,342 11,536,040 Total Savings 42% 46.1% 34.9% Actual Performance 2,753,709 2,409,254 6,258,911 Note: Reference model based on compliance with Malaysian Standard 1525:2007. 22 HigH Performing Buildings fa l l 2 0 1 3 Landscaping surrounding the building helps reduce the urban heat island effect. On-site composting provides nutrients for plants, reduces the need for fertilizers and reduces waste. W At E r At A G l A n C E Annual Water Use 896,000 gallons E n E r G y At A G l A n C E Annual Building Energy Intensity (BEI) (Site) 20.6 kBtu/ft2 Electricity (From Grid) 20.6 kBtu/ft2 Renewable Energy 2 kBtu/ft2 (connected to the national grid to receive a higher feed-in tariff rate) Annual Source Energy 61 kBtu/ft2 Annual On-Site Renewable Energy Exported 2 kBtu/ft2 Annual Net Energy Use Intensity 18.6 kBtu/ft2 Savings vs. Standard 90.1-2004 Design Building 54.9% Average Operating Hours per Week 52 Note: BEI is the total energy consumption, excluding parking garage, divided by the total gross floor area (GFA), excluding parking garage GFA, and rationalized for 2,704 hours operation per year (or 52 hours/week, the standard office working hours in Malaysia). It is also corrected for vacancy space if the building is not 100% occupied. See FAQ 9.5 at www.greenbuildingindex.org/FAQs-9.html for the formula for BEI. • Air-side system addressing the latent load, air movement and air filtration. Primary chilled water is supplied by a district cooling system (DCS) plant. While the facility is called a gas district cooling plant, in reality the existing plant has more http://www.greenbuildingindex.org/FAQs-9.html

Table of Contents for the Digital Edition of High Performing Buildings - Fall 2013

High Performing Buildings - Fall 2013
Commentary
Contents
Alliance Center
Malaysia Energy Commission HQ (Diamond Building)
IAQ in HPB Case Studies
EcoCommercial Building, Noida
25 York Street
Technology
Advertisers Index

High Performing Buildings - Fall 2013