Project Delivery Method: Integrated project delivery (IPD)

Owner Team: Building owner, owner representative (consultant), and facility manager (in-house staff)

Project Delivery Team: IPD project manager; job superintendent; mechanical-electrical coordinator; and HVAC, plumbing, electrical, structural, fire protection, and security consultants  

HVAC Project Team: HVAC contractor project manager; automatic temperature controls (ATC) technician (subcontractor); building automation system (BAS) technician (in-house staff); O&M technician (in-house staff); third-party commissioning consultant (CxC); and testing, adjusting, and balancing (TAB) technician  

Application: 2019 ASHRAE Handbook, Educational Facilities, Chapter 8; and Kitchen Ventilation, Chapter 34

Systems & Equipment: 2020 ASHRAE Handbook, Air-Handling and Distribution, Chapter 4; and In-Room Terminal Systems, Chapter 5

Project Type: Infrastructure replacement

References: Refer to the codes and standards located in the back of each ASHRAE Handbook for additional reference

Other References: ASHRAE Indoor-Air Quality Guide: Best Practice for Design, Construction, and Commissioning; ASHRAE Practical Guide to Seismic Restraints; ASHRAE Standard 55 (Thermal Environmental Conditions for Human Occupancy); ASHRAE Standard 62.1 (IAQ); and ASHRAE Standard 202 (Commissioning Process for Buildings and Systems)

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DESIGN INTENT DOCUMENT (DID)

The HVAC system selection and design intent is based on the process outlined in ASHRAE Handbook 2020, Chapter 1, HVAC System Analysis and Selection, and includes the following:

• Owner’s building program and additional goals
• System and constructability constraints
• Finalized system selection shall be decentralized HVAC systems with terminal units
• Automatic controls shall include temperature controls, equipment furnished controls, a BACnet interface, an internet interface, an existing BAS interface, and the in-house O&M firm’s existing computerized maintenance management software (CMMS) system interface

• Program & Project Goals:
  • Budget goals: First cost and operating cost
  • Timeline goals: an occupancy move-in date of Aug. 15
  • Management goals: School facilities management and in-house mechanical and electrical services

• Available Utilities:
  • Natural gas, electricity, and the BAS system

• Existing Conditions:
  • Replace existing central air system to serve the kitchen hood exhaust and adjacent toilet exhaust
  • Reuse the existing hot water heating system
  • Reuse the existing air-cooled chiller system
  • Reuse the existing sheet metal: low-velocity and galvanized sheet metal with volume and fire dampers
  • Reuse the existing end suction primary/secondary pumping with a variable frequency drive (VFD)     

DESIGN CRITERIA DOCUMENT

• The HVAC design criteria shall be in sync with the project delivery method and the owner’s project requirements
• The design criteria shall be based on ASHRAE 90.1 and state energy code compliance for outdoor air temperature compliance
• Reuse existing utilities and central heating and chilled water systems
• The new automatic controls shall be interfaced with the existing BAS
• The existing central plants shall provide heating in the winter to maintain 68°F, and, in the air conditioning season, 76° via a single duct, thermostatically controlled, providing ventilation air maintaining a positive cafeteria pressure of 0.05 inch gage and negative pressure in kitchen of 0.05 inch gage
• The existing central air system shall be replaced with a new, 100% outdoor air unit with energy recovery of the cafeteria exhaust that is not kitchen hood exhaust
• A new central air system should include MERV-7 prefilters and MERV-14 final filters on the supply air side and MERV-14 filters on the energy recovery wheel intake side
• Existing variable air volume (VAV) and fan-powered air terminals shall be replaced with VAV primary air fan-powered air terminals, operating to provide positive space pressure in the cafeteria and kitchen
• Conceptual/schematic phase general notes: The HVAC design engineer shall provide system flow diagrams with these three documents (OPR, DID, & basis of design [BOD]) along with ATC sequences of operation

Project Delivery Method:

• Design-Build (D-B)
• Integrated Project Delivery (IPD)
• Construction Management @ Risk (CM) with Guaranteed Maximum Price (GMP)
• Design-Bid-Build (D-B-B)

Owner Team:

• Building Owner
• Owner Representative (consultant)
• Project Manager of Capital Projects
• Facility Manager (in-house staff)

Project Delivery Team:

• D-B Project Manager
• IPD Project Manager
• CM Project Manager
• Job Superintendent
• Mechanical-Electrical Coordinator
• HVAC, Plumbing, Electrical, Structural, Fire Protection, and Security Consultants

HVAC Project Team:

• HVAC Contractor Project Manager
• Automatic Temperature Control (ATC) Technician (in-house staff)

• O&M Technician (in-house staff)
• Third-Party Commissioning Consultant (CxC)
• Testing, Adjusting, and Balancing (TAB) Technician

Application 2019 ASHRAE Handbook

• Commercial and Public Buildings, Chapter 3
• Places of Assembly, Chapter 5

• Educational Facilities, Chapter 8
• Kitchen Ventilation, Chapter 34

Systems & Equipment 2020 ASHRAE Handbook

• Air-Handling and Distribution, Chapter 4
• In-Room Terminal Systems, Chapter 5
• Radiant Heating and Cooling, Chapter 6
• Combined Heat and Power Systems, Chapter 7

Project Type:

• New Construction
• Addition
• Renovation
• Infrastructure Replacement
• Tenant Fit-Out

References:

• 2017 ASHRAE Handbook – Fundamentals
• 2018 ASHRAE Handbook – Refrigeration
• Refer to the Codes and Standards Located at the Back of Each ASHRAE Handbook for Additional Reference

Other References:

• ASHRAE GreenGuide: Design, Construction, and Operation of Sustainable Buildings
• ASHRAE Indoor-Air Quality Guide: Best Practice for Design, Construction, and Commissioning
• ASHRAE Design Guide for Dedicated Outdoor Air Systems
• ASHRAE Standard 202 (Commissioning Process for Buildings and Systems)

DESIGN INTENT DOCUMENT (DID)

The HVAC System Selection and Design Intent Is Based on the Process Outlined in ASHRAE Handbook 2020, Chapter 1, HVAC System Analysis and Selection, and includes the Following:

• Owner’s Building Program and Additional Goals

• Specialized Systems Shall Include Toilet Exhaust and Kitchen Exhaust

Program & Project Goals:

• Functional Goals: (Refer to Chapter 1, 2020 Handbook)
• Management Goals: Property Management and In-house Mechanical and Electrical Services

Available Utilities:

• Propane Gas, Electrical Power, Emergency Power, Low-Pressure Steam, and the BAS system

Existing Conditions:

• Central Air Systems: Supply Air and/or Return Air Cubic Feet Per Minute (cfm), General Exhaust, and Toilet Exhaust
• Heating System: Hot Water Heating
• Terminal Units: Variable Refrigerant Flow (VRF) Fan Coil Units
• Sheet Metal: Low Velocity and Galvanized Sheet Metal with Volume and Fire Dampers
• Pumps:  Existing End Suction Primary/Secondary Pumping with a Variable Frequency Drive (VFD)     

DESIGN CRITERIA DOCUMENT

• The HVAC Design Criteria Shall Be in Sync with the Project Delivery Method and Owner’s Project Requirements
• The Design Criteria Shall Be Based on ASHRAE 90.1 and State Energy Code Compliance for Outdoor Air Temperature Compliance
• Reuse Existing Utilities and Central Heating and Chilled Water Systems
• The New Automatic Controls Shall Be Interfaced with the Existing BAS System
• The Existing Central Air System Shall Be Replaced with a New 100% Outdoor Air Unit with Energy Recovery of the Cafeteria Exhaust that is not Kitchen Hood Exhaust
• The New Central Air System will Include MERV-7 Prefilters and a MERV-14 Final Filter on the Supply Air Side and MERV-14 Filters on the Energy Recovery Wheel Intake Side
• Existing Variable Air Volume (VAV) and Fan-Powered Air Terminals Shall Be Replaced with VAV Primary Air, Fan-Powered Air Terminals Operating to Provide Positive Space Pressure in the Cafeteria and Kitchen
• The IPD Project Manager Shall Provide System Flow Diagrams with these Documents (OPR, DID, and BOD) along with ATC Sequences of Operation
• The HVAC Design Engineer Shall Include an Electrical Data Sheet to Coordinate with the Facility Management Firm