Take the VLT of the whole window, not just the glazing, to account for shading from mullions.
Take the VLT of the whole window, not just the glazing, to account for shading from mullions.
For Option 1, find out the Visual Light Transmittance (VLT) value of the glazing and enter it on the LEED EQc8.1–8.2 Glazing Factor and Views Calculator for each occupied space. The VLT is usually included with the glazing specifications.
For Option 1, find out the Visual Light Transmittance (VLT) value of the glazing and enter it on the LEED EQc8.1–8.2 Glazing Factor and Views Calculator for each occupied space. The VLT is usually included with the glazing specifications.
Identify the glazing type within each regularly occupied space. The LEED Reference Guide includes a helpful figure (p. 374) and chart of daylighting design criteria (p. 375) to help determine glazing type. The possible glazing types identified by LEED inc
Identify the glazing type within each regularly occupied space. The LEED Reference Guide includes a helpful figure (p. 374) and chart of daylighting design criteria (p. 375) to help determine glazing type. The possible glazing types identified by LEED include the following:
Vision Glazing – Sidelighting (window areas between 2’6” – 7’6”)
Run prescriptive design calculations to verify that the required percentage of regularly occupied areas meets the required levels for credit compliance. Use the LEED EQc8.1–8.2 Glazing Factor and Access to Views Calculation to enter the names of the regul
Run prescriptive design calculations to verify that the required percentage of regularly occupied areas meets the required levels for credit compliance. Use the LEED EQc8.1–8.2 Glazing Factor and Access to Views Calculation to enter the names of the regularly occupied spaces, their square footage, and the corresponding VLT value of the glazing.
Option 1: Glazing Factor Calculation
Option 1: Glazing Factor Calculation
Identify the regularly occupied spaces and their square footage.
Identify the regularly occupied spaces and their square footage.
Glare can hinder the use of a space and be unpleasant for occupants. Daylight modeling can help project teams anticipate problem areas due to sun angles as they interact with the architecture. Exterior and interior shading along with associated controls c
Glare can hinder the use of a space and be unpleasant for occupants. Daylight modeling can help project teams anticipate problem areas due to sun angles as they interact with the architecture. Exterior and interior shading along with associated controls can greatly reduce the effects of glare.
Integrate glare control into the design.
Integrate glare control into the design.
Daylight controls, sensors, integrated blinds, and lighting controls come with moderate first costs but will bring energy savings over the long run.
Daylight controls, sensors, integrated blinds, and lighting controls come with moderate first costs but will bring energy savings over the long run.
Daylight sensors that adjust lamp brightness based on the presence of natural light can greatly reduce lighting energy loads. On average, commercial buildings use 25% of their energy for lighting. Dimming ballasts are more expensive up front and complicat
Daylight sensors that adjust lamp brightness based on the presence of natural light can greatly reduce lighting energy loads. On average, commercial buildings use 25% of their energy for lighting. Dimming ballasts are more expensive up front and complicated to specify than stepped ballasts. However, stepped lighting is considered less attractive because the dimming is not gradual and can be distracting to occupants but can do an excellent job reducing energy use.