Rating System

LEED BD+C: New Construction

Rating System Version

v2 - LEED 2.0

Inquiry

Our design project consists of Classrooms, offices, conference rooms, dining rooms, library, atrium, and support spaces. The supply air system is a mixing system with supply air (Group A outlets) and return air devices at the ceiling level in all regularly occupied areas of the building. In order to obtain this credit, we have chosen to follow the second path of compliance, through design verification, as described on page 234 of the LEED reference guide by following guidelines mentioned in Chapter 31 of ASHRAE Fundamentals Handbook. However, we have the following questions: 1. ASHRAE Handbook of Fundamentals, Chapter 31, recommends a minimum ADPI of 80. Can we assume that an ADPI of 80 or more in each of the major spaces would satisfy the intent of the credit? If not, what value of ADPI will be acceptable? 2. In addition to submitting narratives, plans, sections, air velocities, location of supply and return air devices, we propose to submit outputs of a commercially available program that calculates Room ADPI based upon an actual design layout. This would be submitted for each of the typical spaces such as Classrooms, offices, conference rooms, dining rooms, library, and atrium. Would these be sufficient to comply with the requirements of the credit? A sample output sheet for a conference room is listed below for your review. Titus GRD Selection Room Air Device Calculations Large conference room ADPI: 82.0 Room Data Length x Width: 39.0 x 19.0 Ft. Maximum Room NC Level: 35 Ceiling Height: 9.0 Ft. Sensible Room Load: 26 BTUh/sf dT: 20 Area: 741.0 Sq. Ft. Air Changes: 8.0 ACPH Perimeter: 0 Ft. Mounting Type: Lay-in Supply Diffuser Data CD-2 Room Design Supply: 880 CFM: Room Comfort Model No.: PCS CFM: 110 Actual Max. Min Neck: 8 RND Throw: 6.0 Border Style: 1 - Surface Mount Pd: 0.03 ADPI 82 91.9 0.0 Throw Pattern: 4-way NC Level: 30 Description: Perforated Ceiling Diffuser Vt: 50.00 Heating TR: 0.4 Supply Drafting Data Tag: CD-2 No. of Diffusers: 8 CFM: (each):110Module Size: 24x24 Neck Size: 8 Throw: 4-way Layout: 2x 4 Return Device Data Room Design Return: 440 CFM: Model No.: : 0 Neck: 22x22 Pd: Module: 24x24 NC Level: 35 Border Style: Return Drafting Data Tag: No. of Returns: 2 Neck Size: CFM: (each):0 Module Size: