Project Delivery Method: Design-bid-build (DBB)

Owner Team: Financial office building manager, owner’s representative consultant, facility manager (in-house staff), and third-party commissioning (Cx) agent

Project Delivery Team: HVAC consulting firm’s project manager and design engineer and electrical, plumbing, and structural engineer consultants

HVAC Project Delivery Team: HVAC contractor (prime contractor) awarded the project based on contract document bid. Other team members are the DBB HVAC job superintendent; mechanical-electrical coordinator; cooling tower manufacturer technician; rigging subcontractor; plumbing and electrical subcontractors; and subcontractor testing, adjusting, and balancing (TAB) technician.

2019 ASHRAE Handbook HVAC Application: Commercial and Public Buildings, Chapter 3, and Data Center and Telecommunication Facilities, Chapter 20

2020 ASHRAE Handbook HVAC Systems and Equipment: Condenser Water Systems, Chapter 14, and Cooling Towers, Chapter 40

Project Type: Infrastructure (central process cooling condenser water system cooling) and facility deferred maintenance master plan implementation

References: 2019 ASHRAE Handbook — HVAC Applications, 2020 ASHRAE Handbook — HVAC Systems and Equipment, and the codes and standards located at the end of each ASHRAE Handbook for additional reference

Other References: Cooling Technology Institute (cooling towers); ASHRAE Guideline 22, Instrumentation for Monitoring Central Chilled Water Plant Efficiency; ASHRAE Fundamentals of Design and Control of Central Chilled-Water Plants; ASHRAE Standard 202 (Commissioning Process for Buildings and Systems), and Facility Condition Index (a standard facility condition benchmark)

DESIGN INTENT DOCUMENT (DID)

HVAC Design Intent:

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

  • Owner building program goals and additional goals.
  • System constraints and constructability constraints.
  • The finalized system selection shall consist of a replacement cooling tower and standby cooling tower to serve financial data center.
  • Specialized systems shall include an existing plate and frame waterside heat exchanger located in the central chiller plant.
  • Automatic controls shall include temperature controls, furnished controls, BACnet interface, internet interface, existing building automation system (BAS) interface, and existing computerized maintenance management software (CMMS) system interface.
• Program and Project Goals:
  • Functional goals: (refer to Chapter 1, 2020 Handbook).
  • Budget goals: first cost.
  • Timeline goal(s): four-month construction period.
  • Management goals: property management and in-house mechanical and electrical services and outside service contract for cooling towers and chemical treatment.

• Available Utilities:

  • Electrical power, emergency power, central plant condenser process water system.
  • Existing waterside economizer system.

DESIGN CRITERIA DOCUMENT

• The HVAC design criteria shall be in sync with the project delivery method and owner’s project requirements.
• A construction phased cooling tower and standby tower replacement schedule based on the facility’s deferred maintenance replacement plan.
• The existing cooling towers shall remain in operation until the change-over to the new cooling tower installation.
• Rebalancing of the condenser water system for condenser water flow, standby flow, and waterside economizer flow sequences.
• The design team shall provide contract drawings and specifications coordinated with equipment weight; electric data, including the emergency power requirements and plumbing criteria, to solicit general contractor bids.
• Field fabrication drawings shall become the record drawings at closeout.
• New cooling tower units shall be furnished with operation and maintenance (O&M) manuals.
• The equipment manufacturer’s preventive maintenance work orders shall be uploaded to the existing O&M staff’s computerized maintenance management software (CMMS) system.
• The D-B-B contractor shall provide system training to the building’s O&M staff regarding the cooling towers and the 24/7, year-round condenser water system and electrical normal and emergency power systems.

Project Delivery Method

• Design-Build (D-B)
• Construction Management at Risk (CM) with Guaranteed Maximum Price (GMP)
• Design-Bid-Build (D-B-B)

Owner Team

• Commercial Property Management Owner
• Owner’s Representative (consultant)
• Project Manager of Capital Projects
• Facility Manager (in-house staff)
• Third-Party Commissioning Consultant (CxC)

Project Delivery Team

• D-B Project Manager
• D-B-B Consultant Project Manager
• Job Superintendent
• Electrical, Plumbing, and Structural Engineer Consultants

HVAC Project Delivery Team

• HVAC Job Supervisor
• HVAC Job Superintendent
• Cooling Tower Manufacturer Technician
• O&M Technician (outsource staff)
• Testing, Adjusting, and Balancing (TAB) Technician

Application 2019 ASHRAE Handbook

• Commercial and Public Buildings, Chapter 3
• Places of Assembly, Chapter 5
• Industrial Facilities, Chapter 15
• Data Centers and Telecommunication Facilities, Chapter 20

Systems 2020 ASHRAE Handbook

• HVAC System Analysis and Selection
• Air-Handling and Distribution, Chapter 4
• In-Room Terminal Systems, Chapter 5
• Condenser Water Systems, Chapter 14

Project Type

• New Construction
• Renovation
• Shell and Core
• Tenant Fit-Out
• Infrastructure

References

• 2017 ASHRAE Handbook – Fundamentals
• 2018 ASHRAE Handbook – Refrigeration
• 2019 ASHRAE Handbook – HVAC Applications
• 2020 ASHRAE Handbook – HVAC Systems and Equipment

Other References

• ASHRAE Guideline 22, Instrumentation for Monitoring Central Chilled Water Plant Efficiency
• ASHRAE GreenGuide: Design, Construction, and Operation of Sustainable Buildings
• Cooling Technology Institute
• ASHRAE UFAD Guide and O&M Guide Set
• ASHRAE Standard 90.4 (Energy Standards for Data Centers)
• ASHRAE Standard 202 (Commissioning Process for Buildings and Systems)

DESIGN INTENT DOCUMENT (DID)

HVAC Design Intent

• The HVAC system selection and design intent is based on the process outlined in ASHRAE Handbook 2020, Chapter 1, HVAC System Analysis and Selection
• Program and Project Goals: Functional Goals: (refer to chapter 1, 2020 Handbook), Budget Goal: First Cost, and Timeline Goal(s): Four-Month Construction Period
• Finalized System Selection Shall Be Replacement Cooling Tower and Standby Cooling Tower to Serve the Financial Data Center
• Specialized Systems Shall Include the Existing Plate and Frame Waterside Heat Exchanger located in Central

Chiller Plant

• Special System(s): Sound Attenuators and Vibration Isolators
• Air Filters: MERV-14 Filters in the New CRAC Units
• Terminal Units: Variable Refrigerant Flow (VRF) Fan Coil

DESIGN CRITERIA DOCUMENT

• The HVAC Design Criteria Shall Be in Sync with the Project Delivery Method and Owner’s Project Requirements.
• A Construction Phased Cooling Tower and Standby Tower Replacement Schedule Is Based on the Facility’s Deferred Maintenance Replacement Plan
• Raised Floor 2-By-2-Foot Floor Tiles Shall Be Coordinated in Anticipation of the Data Center Equipment’s Arrival. Underfloor Supply Air Shall Also Be Provided Directly Below Specific Pieces of Computer Equipment.
• Rebalancing of the Condenser Water System for Condenser Water Flow, Standby Flow, and for Waterside Economizer Flow Sequences
• The Design Team Shall Provide Contract Drawings and Specification Coordinated with Equipment Weight; Electric Data, Including Emergency Power Requirements, and Plumbing Criteria to Solicit General Contractor Bids
• Field Fabrication Drawings Shall Become the Record Drawings at Closeout
• CRAC Units Shall Be Furnished with O&M Manuals. The Preventive Maintenance Work Orders Shall Be Uploaded to the Outsource O&M Contractor’s Computerized Maintenance Management Software (CMMS) system
• The D-B-B Contractor Shall Provide System Training to the Building’s O&M Staff Regarding the Air Conditioning, Humidification, and Electrical Systems