Project Delivery Method: Design-Build (D-B)

Owner Team: Hospital president, owner representative (consultant), project manager of capital projects, and facility manager (in-house staff)

Project Delivery Team: D-B project manager and HVAC D-B engineer

HVAC Project Team: HVAC supervisor (in-house staff); automatic temperature control (ATC) technician subcontractor; building automation system (BAS) technician (in-house staff); third-party commissioning consultant (CxC); third-party testing, adjusting, and balancing (TAB) technician; and infection control consultant (IC)

Application 2019 ASHRAE Handbook: Healthcare Facilities, Chapter 9

Systems 2020 ASHRAE Handbook: Air Cleaners for Particulate Contaminants, Chapter 29

Project Type: Infrastructure improvements

References: 2017 ASHRAE Handbook – Fundamentals; refer to the codes and standards section in the back of each ASHRAE Handbook for additional reference; ASHRAE Standard 170 (Ventilation of Healthcare Facilities); ASHRAE Standard 202 (Commissioning Process for Buildings & Systems); and the Design-Build Institute of America (DBIA)

DESIGN INTENT DOCUMENT (DID)

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

  • Owner’s building program goals and additional goals

  • System constraints and constructability constraints

  • Finalized air filter MERV rating and unit sizes

  • The ATC shall include new automatic controls, a BACnet interface, and internet interface to the existing BAS interface and existing computerized maintenance management software (CMMS) system interface

• Program and Project Goals:

  • Functional goals: (refer to 2020 Handbook, Chapter 1)

  • Budget goals: first cost, operating cost, and life cycle cost

  • Timeline goals: phased construction date throughout the hospital

  • Management goals: air filtration and IAQ management

• Existing Conditions:

  • Central air systems

  • Minimum, air-side economizer and 100% outside air systems

• Central Air Systems:

  • Supply air systems: single-duct, single-zone, single-duct-multiple zones with terminal units, dual-duct dual-fan, rooftop, underfloor air distribution (UFAD), primary-secondary, constant volume, and variable air volume (VAV)

  • Pre-filter, final filter, after filter, HEPA filter, and fan-power HEPA filter unit with a MERV rating based on the area served

• Supply Air Fans:

  • Add variable frequency drive (VFD) to reengineered existing central air systems with filter differential pressure drop control set points

DESIGN CRITERIA DOCUMENT

• The HVAC design criteria shall be in sync with:

  • D-B project delivery method

  • The owner’s project requirements

  • The design criteria shall be based on an analytical analysis of existing HVAC conditions, associated operation, and proactive maintenance management in sync with the hospital’s overall needs, updating the policy and procedure manual as it pertains to occupant comfort and IAQ and infection control.

  • From this updating of the P&P manual, the existing central air-handling systems will be rebalanced and retro-commissioned after enhanced filter MERV-rated filters replace existing filters.

• The design criteria shall be based on:

  • ASHRAE Standard 170, “Ventilation of Healthcare Facilities”

  • ASHRAE Standard 202, “Commissioning Process for Buildings & Systems”

  • Retrofit all central air systems with a new VFD

• Conceptual/schematic phase general notes:

  • The D-B HVAC design engineer shall provide system flow diagrams with each HVAC system along with the ATC sequences of operation

  • The facility manager shall have the O&M technicians trained to accommodate P&P changes as they affect the HVAC system occupant comfort, IAQ, etc.

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:

Hospital President

Building Program Committee

Owner Representative (consultant)

Project Manager of Capital Projects

Facility Manager (in-house staff)

Project Delivery Team:

D-B Project Manager

D-B-B Project Manager

Equipment Manufacturer Technician

HVAC D-B Engineer

Architect, Acoustical, Plumbing, Electrical, Structural, Fire Protection, and Security Consultants

HVAC Project Team:

HVAC Supervisor (in-house staff)

Automatic Temperature Control (ATC) Technician Subcontractor

Building Automation System (BAS) Technician (in-house staff)

Third-Party Commissioning Consultant (CxC)

Third-Party Testing, Adjusting, & Balancing (TAB) Technician

Energy Engineering Consultant (EEC)

Infection Control Consultant (IC)

Application 2019 ASHRAE Handbook

Places of Assembly, Chapter 5

Healthcare Facilities, Chapter 9

Clean Space/Rooms, Chapter 19

Environmental Control, Chapter 25

Systems 2020 ASHRAE Handbook

Air-Handling and Distribution, Chapter 4

In-Room Terminal Systems, Chapter 5

Air Cleaners for Particulate Contaminants, Chapter 29

Cleaning and Air-Pollution Control, Chapter 30

Project Type:

New Construction

Infrastructure Improvements

Energy Audit & Retrofit

Facility Audit & Capital Project Master Planning

References:

2017 ASHRAE Handbook – Fundamentals

2018 ASHRAE Handbook – Refrigeration

Refer to the Codes and Standards Section Located in the Back of Each ASHRAE Handbook

ASHRAE Standard 170 (Ventilation of Healthcare Facilities)

ASHRAE Standard 202 (Commissioning Process for Buildings & Systems)

ASHRAE Guideline 0 (Commissioning Process)

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 Goals and Additional Goals

  • System Constraints and Constructability Constraints

  • Finalized Air Filter MERV Rating and Unit Sizes

• Program and Project Goals:

  • Functional Goals (Refer to 2020 Handbook, Chapter 1)

  • Budget Goals: First Cost, Operating Cost, and Life Cycle Cost

  • Timeline Goals: Phased Construction Date Throughout Hospital

  • Management Goals: Air Filtration and IAQ Management

  • Outsource Mechanical and Electrical Services, Service Contract, Filter Manufacturer Contract, and Capital Projects Management

  • Other Goals: Environmental and Net-Zero Energy

• Existing Conditions:

  • Central Air Systems

  • General Exhaust and Toilet Exhaust

• Air Conditioning System(s):

  • Air-Cooled Chiller Chilled Water and Computer Room Air Conditioning (CRAC) Unit

• Outdoor Air Ventilation System(s):

  • Minimum Air-Side Economizer, and 100% Outside Air Systems

• Central Air Systems:

  • Supply Air Systems: Single-Duct, Single-Zone; Single-Duct Multiple Zones with Terminal Units; Dual-Duct, Dual Fan; Rooftop; Underfloor Air Distribution (UFAD); and Primary-Secondary, Constant Volume, and Variable Air Volume (VAV)

  • Return Air (RA) Systems and Ceiling Plenum Return

• Air Filters and Distribution:

  • Pre-Filter, Final Filter, After Filter, HEPA Filter, and Fan-Power HEPA Filter Unit with a MERV Rating Based on the Area Served

• Supply Air Fans:

  • Add a Variable Frequency Drive (VFD) to Re-Engineered Existing Central Air Systems with Filter Differential Pressure Drop Control Setpoints

DESIGN CRITERIA DOCUMENT

• The HVAC Design Criteria shall be in sync with:

  • Project Delivery Method

  • The Owner’s Project Requirements

  • From This Updating of the P&P Manual, the Existing Central Air-Handling Systems will Be Rebalanced and Retro-Commissioned after Enhanced Filter MERV-Rated Filters Replace Existing Filters

• The Design Criteria Shall Be Based on:

  • ASHRAE 90.1 and State Energy Code Compliance for Outdoor Air Temperature Compliance.

  • ASHRAE Standard 170, “Ventilation of Healthcare Facilities”

  • ASHRAE Standard 202, “Commissioning Process for Buildings and Systems”

  • ASHRAE Guideline 0, “Commissioning Process”

  • The New Utility Shall Be 480/3/60 Electrical Power to Serve Central Air Systems with the New Automatic Controls Shall Be Interfaced with the Existing BAS system

  • Retrofitted All Central Air Systems with New VFD

• Conceptual/Schematic Phase General Notes:

  • D-B HVAC Design Engineer Shall Provide System Flow Diagrams with Each HVAC System Along with ATC Sequences of Operation

  • The In-House BAS Technician will Update Existing Safeties and Alarms Associated with Occupant Comfort, IAQ, and Area Space Pressure Controls Working with the Third-Party CxC and Third-Party TAB Technician

  • The Facility Manager Shall have the O&M Technicians Trained to Accommodate P&P Changes as they Affect the HVAC System Occupant Comfort and IAQ, Changing of Filters, etc.