PDD Study Guide Exam 4 Questions & Answers 2024/2025

PDD Study Guide Exam 4 Questions & Answers 2024/2025 Luminance - ANSWERSThe measure of brightness of a light at a surface. This is based on the reflectivity of the surface's material Luminous Flux - ANSWERSThe rate of flow of visible light per unit time. Luminous Intensity - ANSWERS1 unit = candela Lighting Power Density (LPD) - ANSWERSrepresents the load of any lighting equipment in any defined area, or the watts per square foot of the lighting equipment. Building Area Method - ANSWERS- limits the total LPD used in a building by giving a maximum allowable power in watts per square foot of building area, based on the building type. - The LPDs given for various facilities are based on the lighting needed for the tasks in the space. Space-by-Space Method - ANSWERS- assigns LPDs to common space types - The designer must determine the gross area of each space type in the building and multiply each area by the allowable wattage per square foot - In the space-by-space method, additional lighting power is allowed for certain functions e.g. decorative lighting Energy Cost Budget Method - ANSWERS- used to determine the energy cost budget for a specific building design - The budget is calculated by means of a computer simulation of hourly energy use over the course of a year by use of appropriate climatic data, approved building envelope design, comparisons to a baseline building, and other aspects as defined in Standard 90.1. - In this method, LPAs are only one aspect of the building's total energy use. The designer can make trade-offs between energy needs for lighting and energy needs for other building systems