These requirements address mandatory provisions related to voltage drop. Mandatory provisions include requirements for load calculations (7.4.1), efficiency (7.4.2), piping insulation (7.4.3), controls (7.4.4), pool heaters and pool covers (7.4.5), and heat traps for storage tanks (7.4.6). These requirements include mandatory provisions (7.4) and a choice of prescriptive (7.5) or performance-based compliance (Appendix G). Section 7 – Service Water Heating Requirements.Prescriptive provisions are included for air and water economizers (6.5.1) simultaneous heating and cooling limitations (6.5.2) air system design and control, including fan power limitation and variable speed drive control (6.5.3) hydronic system design and control, including variable flow pumping (6.5.4) heat rejection equipment (6.5.5) energy recovery from exhaust air and service water heating systems (6.5.6) kitchen and fume exhaust hoods (6.5.7) radiant heating systems (6.5.8) and hot gas bypass limitations (6.5.9). Mandatory provisions for HVAC performance are documented in ASHRAE 90.1–2007, Section 6.4, and include minimum system efficiency requirements (6.4.1), load calculation requirements (6.4.2), controls requirements (6.4.3), HVAC system construction and insulation requirements (6.4.4), and completion requirements (6.4.5).ĪSHRAE 90.1–2007, Section 6.4.3.4, lists minimum control schemes for thermostats (off-hours, including setback and optimum start/stop), stair and elevator vents, outdoor air supply and exhaust vents, heat pump auxiliary heat, humidification and dehumidification, freeze protection, snow- and ice-melting systems, and ventilation for high-occupancy areas.ĪSHRAE 90.1–2007, Section 6.5, provides a prescriptive compliance option. The requirements of Section 6 apply to all building HVAC systems. Section 6 – Heating, Ventilation and Air-Conditioning Requirements.The project may exceed the envelope prescriptive requirements if the project uses an energy simulation model to document points earned for EA Credit 1, Optimize Energy Performance.
Window area must be less than 40% of the gross wall area, and the skylight area must be less than 5% of the gross roof area. For projects following the prescriptive compliance method, all building envelope components must meet the minimum insulation and maximum U-factor and solar heat gain coefficients (SHGC) requirements listed for the project’s climate zone. Prescriptive building envelope requirements are determined based on the building’s climate zone classification (ASHRAE Standard 90.1–2007, Tables 5.5-1 to 5.5-8). Section 5.5 contains the prescriptive provisions for fenestration and opaque assemblies.
Section 5 – Building Envelope RequirementsĪSHRAE 90.1-2007 Section 5.4 describes mandatory provisions for insulation installation (5.4.1) window, skylight, and door ratings (5.4.2) and air leakage (5.4.3).