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LEED BD+C: Core and Shell | v3 - LEED India 2011

Increased ventilation

EQc2 | Possible 1 point

Intent

To provide additional outdoor air ventilation to improve indoor air quality (IAQ) and promote occupant comfort, well-being and productivity.

Requirements

CASE 1. Mechanically Ventilated Spaces

Increase breathing zone outdoor air ventilation rates to all occupied spaces by at least 30% above the minimum rates required by ASHRAE Standard 62.1-2007 (with errata but without addenda27) (OR) an equivalent Local standard, as determined by IEQ Prerequisite 1: Minimum Indoor Air Quality Performance.

If using a local standard for establishing a baseline and measuring performance relative to that baseline, the following general topics must be addressed for equivalency with ASHRAE Standard 62.1–2007 (with errata but without addenda):

  • Outdoor air quality
  • Systems and equipment
  • Ventilation rate procedure and indoor air quality IAQ (indoor air quality) procedure
  • Construction and system start-up

For more details, see the ASHRAE Reference Guide or relevant sections of the equivalent Local standard.

CASE 2. Naturally Ventilated Spaces

Determine that natural ventilation is an effective strategy for the project by following the requirements of the flow diagram process shown in the CIBSE Applications Manual 10: 2005, Figure 2.8.

OR

Use a Local standard to demonstrate performance that is equivalent to CIBSE by establishing a baseline, and measure performance relative to that baseline. The following guidelines outline the methodology for establishing acceptable benchmarks and metrics to demonstrate equivalency of the Local standard with Figure 2.8 of CIBSE AM 10:2005:

  • Heat gain
  • Transient occupancy
  • Seasonal mixed-mode ventilation
  • Floor plan
  • Courtyard or atrium layout
  • Zonal mixed-mode ventilation
  • Perimeter zone conditions, including noise and pollution levels
  • Control of ventilation by occupants
  • Temperature and relative humidity control
  • Humidification

AND

OPTION 1

Show that the natural ventilation systems design meets the recommendations set forth in the CIBSE manuals appropriate to the project space. (OR) Use a local standard to demonstrate performance that is equivalent to the requirements of CIBSE Applications Manual 10: 2005 or CIBSE AM 13: 2000, Mixed Mode Ventilation, by substituting appropriate benchmarks and metrics for establishing a baseline, and measure performance relative to that baseline.

PATH 1:

Use CIBSE Applications Manual 10: 2005, Natural Ventilation in Non-domestic Buildings (OR) use a local standard to address the following general topics and demonstrate equivalency with CIBSE AM 10: 2005:

Design Strategy

  • Design
  • Selection process for natural ventilation
  • Wind and stack effects
  • Natural ventilation strategies (e.g., chimney ventilation, stack ventilation)

Ventilation Components and System Integration

  • Principles, products and processes for ventilation and control
  • Ventilation opening types
  • Internal obstructions
  • Background leakage
  • Window stays and automatic actuators
  • Control system
  • Installation and commissioning

Design Calculations

  • Required flow rates
  • Ventilation design tool selection
  • Design procedures using envelope flow models
  • Input data requirements and selection
  • Reservoir effect

PATH 2.

Use CIBSE AM 13:2000, Mixed Mode Ventilation (OR) use a local standard to address the following general topics and demonstrate equivalency with CIBSE AM 13: 2000:

  • Mixed mode ventilation types
  • Design principles for mixed mode buildings and systems
  • Building fabric properties
  • Contingency mixed mode
  • Complementary mixed mode
  • Zoned mixed-mode systems
  • Control of mixed-mode systems
  • Commissioning considerations for the designer
  • Handover, management and operation considerations for the designer
  • Modeling and modeling techniques
  • Energy and environmental benefits
  • Window design
  • Thermal comfort
  • Commissioning activities
  • Handover, management, operation and maintenance considerations

OR

OPTION 2

Use a macroscopic, multizone, analytic model to predict that room-by-room airflows will effectively naturally ventilate, defined as providing the minimum ventilation rates required by ASHRAE 62.1-2007 Chapter 6 (with errata but without addenda27), for at least 90% of occupied spaces. (OR) Use a Local standard to demonstrate minimum ventilation rate performance equivalent to the requirements of ASHRAE 62.1–2007, Chapter 6 (with errata but without addenda27), for at least 90% of occupied spaces, by substituting appropriate benchmarks and metrics for establishing a baseline, and measure performance relative to that baseline. The following general topics must be addressed to demonstrate equivalency with ASHRAE:

  • Ventilation rate procedure
  • Indoor air quality (IAQ) procedure
  • Design documentation procedures
27 Project teams wishing to use ASHRAE approved addenda for the purposes of this credit may do so at their discretion. Addenda must be applied consistently across all LEED credits.
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