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Session 16.02, #631, Slide #Teaching hospital design with FGI acoustical criteria

Case study: Teaching hospital design with

FGI acoustical criteriaJack B. Evans, PE

Chad N. Himmel, PECassandra H. Wiese

4407 Medical PkwyAustin TX 78756 USAwww.JEAcoustics.com

[email protected]


Firm Profile & Personal Resumes

Medical Treatment and Teaching HospitalFGI & LEED acoustical and noise criteria

“Triage” ‐ Determine and apply most strict criteria1st Priority – Neutralize/smooth spectrum

2nd Priority – Reduce excess individual levels3rd Priority – Reduce additive multiple sources4th Priority – Reduce reverberant build‐up

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Outline

Acoustical Consultation Firm, established 1986 Austin, Texas

www.JEAcoustics.com

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Abstract

The Facility Guidelines Institute’s “Guidelines for Design and Constructionof Hospitals and Outpatient Facilities,” are adopted as code in manystates of the United States and in other countries. Where not code‐level,the criteria serve as a design standard implemented at the discretion ofthe owner or architect, including this project’s location.

Determination of compliance with criteria requires theoretical calculationin design phase or performance validation testing after construction.

This acoustician was retained to consult on an eight‐story teachinghospital, including documentation of design conformance to the criteriaby calculation, review and analyses of architectural and engineeringdesigns.

This study discusses the required acoustical criteria and allowable limitsfor indoor mechanical equipment noise and environmental noiseexposure. Calculation procedures, analyses, and on‐site measurementsundertaken to document conformance are presented with results.

Commentary is offered about design alternatives that aided or inhibitedsuccess of conformance with criteria.

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1 INTRODUCTION• Dell Seton Medical Center at The Univ. of Texas (DSMC‐UT):

• Mandate to achieve sustainability certification under the U.S Green Building Council’s (USGBC) “Leadership in Energy & Environmental Design” (LEED) rating system.

• Criteria from FGI Guidelines for Design and Construction of Health Care Facilities, 2010 Edition• ASHRAE HVAC Systems Manual. • FGI 2014 acoustical amendments were also considered.

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1 INTRODUCTION

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1 INTRODUCTION

• The Dell Seton Medical Center at The University of Texas (DSMC‐UT):• Created as a private teaching and regional hospital in conjunction with Univ. of Texas Dell Medical School.

• New institution established by the state government and public university system.• HKS Architects and their engineers and consultants

• Multistory patient tower on a pedestal:• Various medical, diagnostic, treatment and administrative occupancies• Surrounded by noisy urban environment. • Overlapping ordinance/code, institutional and basis of design criteria and parameters

• Mandate to achieve sustainability certification under the U.S Green Building Council’s (USGBC) “Leadership in Energy & Environmental Design” (LEED) rating system.

• Project is designed to conform with LEED BD+C Healthcare,.• Consultant’s Scope: Establishment of Acoustical Criteria, review and evaluation of architect’s and engineers’ (A/E) design documents, and development of recommendations to be implemented in A/E documents

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2 Criteria Overview

• Programming incorporated FGI 2010 in the project Basis of Design (BoD).

• The acoustical consultant recommended comprehensive acoustical design criteria as BoD, • Based on ASHRAE 2010, FGI 2010 with consideration of 2014 amendments, and successful experience in previous projects.

• FGI ‐ six acoustical criteria sets with one set of vibration criteria (2010 and 2014 tables). • Room finishes (NRC) and Sound isolation (composite) STCc.• Speech privacy descriptors (designer’s choice) AI, PI, STI, SII. • Background Noise: Room Criteria (RC, preferred), Noise Criteria (NC) and/or A‐weighted overall (dBA).• Environmental or outdoor noise intrusions: STCc (2010) or OITCc (2014)• FGI comments on communications devices (alarms, call and paging) levels and locations. • FGI Floor Vibration Criteria due to footfall impact (structural vibration not included in the consultant’s scope of services).

• 1996 Health Insurance Portability and Accountability Act (HIPAA) privacy mandates • achievable when FGI privacy criteria are satisfied.

• LEED Healthcare has 2 potential acoustical points, which reference FGI 2010 acoustical criteria:• Option 1: Speech Privacy, Sound Isolation, and Background Noise (1 point)• Option 2: Acoustical Finishes and Site Exterior Noise (1 point, after Option 1 satisfied)

• FGI 2014 edition criteria amendments were also considered for this project.

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2 Criteria Overview

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2.1 Room Absorption

• Room‐average sound absorption criteria (NRC), varies by occupancy or room function.

• Average NRC• Transitory or non‐occupied spaces: small amount of absorption.

• Areas where speech privacy is necessary:more absorption.

•Unique or special function areas listed in FGI: evaluated to determine appropriate absorption.

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2.1 Room Absorption

Design Room (Avg.) Sound Absorption Coefficients (NRC)• Medium Live ‐ NRC 0.10

• Atrium, Entry Lobby

• Average ‐ NRC 0.15• Patient, Treatment Rooms, Corridor, Physician Office, Medication

• Medium Dry ‐ NRC 0.25• Waiting Area, Admitting, Other ‘Privacy’ Area

• FGI 2014: add “medication safety zones, operating rooms”

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2.3 Sound Isolation

• Demising Assemblies Selection Matrix – minimum sound isolation performances between enclosed rooms

• FGI Criteria in Black, Non‐FGI‐listed spaces are in blue.

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2.4 Acoustical Privacy

• FGI 2010 permits AI, PI, STI and SII speech privacy descriptors (choice).

• FGI 2014 (blue) introduces SPC in lieu of STI; retains other three ratings.

• Privacy is categorized from “normal” to “secure.” • Speech intelligible to casual listeners• Small percentage of speech syllables can be understood

• Guidance for confidential speech privacy in enclosed rooms• sum of composite demising assembly STC plus A‐weighted background noise in receiving room not less than 75 dB.

• The Guidelines note that speech privacy cannot be fully achieved in open areas, but provides a “normal” recommendation rating.

• Guidance for confidential speech privacy in open areas• Space planning, partitions or barriers and room finishes• Sound masking

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2.4 Acoustical Privacy

Speech Privacy Goals ( FGI 2010 black, 2014 blue)

• Enclosed Rooms Goal AI PI SII STI SPC• Normal <0.15 >85% <0.20 <0.19 65‐70• Confidential <0.05 >95% <0.10 <0.12 71‐79• Secure Special consideration required >80

• Open Plan Goal AI PI SII STI SPC• Marginal 0.21‐0.40 60‐79% 0.26‐0.45 ‐‐‐ 55‐64• Normal <0.20 >80% <0.25 <0.23 65‐70• Confidential Special consideration required 55‐64

• HIPAA: Public Law 104‐191, The Health Insurance Portability and Accountability Act• Title I protects insurance coverage for workers that change or lose their jobs.• Title II requires establishment of standards for electronic transactions and identifiers for health

providers, insurance plans and employers, and standards for health data security and privacy.

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2.5 Continuous Background Noise in Interior Spaces (RC, NC, dBA)

• FGI references room criteria (RC), noise criteria (NC) & A‐weighted (dBA)

• Noise Criteria Intent: achieve comfortable, non‐annoying background sound levels with smooth spectra

• Do not interfere with speech or normal activities• Neither induce vibration nor interfere with noise and vibration sensitive lab or diagnostic instruments.

• FGI considered ANSI and ASHRAE noise criteria in 2010 Guidelines

• 2010 includes minimum and maximum levels.• 2014 changes criteria to maximum levels only• 2014: “medication station, NICU sleep areas, NICU staff & family areas.”

• The consultant recommends the RC system, which produces a more neutral spectrum and incorporates two lower octaves than other criteria, where acoustically induced vibration occurs.

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2.5 Continuous Background Noise in Interior Spaces (RC, NC, dBA)

• Table 5 ‐Minimum – Maximum Design Criteria for Continuous Interior Background Noise []• Room Type RC(N) / NC dBA• Patient Room 30‐40 35‐45• Medication Station 45 50• Multiple Occupant 35‐45 40‐50• Corridors / Public 35‐45 40‐50• Physician Off, Exam 30‐40 35‐45• Conference Rooms 25‐35 30‐40• Teleconference 25 (max) 30• NICU (2010) 25‐35 30‐40• NICU sleep areas 30 35• NICU staff, family 35 40• Operating Rooms 35‐45/50 40‐50/55• Testing/Rsrch Lab 45‐55 50‐60• Group Teaching Lab 35‐45 40‐50• Auditorium, Lecture 25‐30 30‐35

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2.6 Building Vibration Based on StructuralResponse to Impact

• Building vibration criteria are recommended for structural design,• Vertical: building systems equipment, user‐installed equipment, occupant activities

• Exterior sources entering the structure through the foundation.

• Horizontal: sensitive lab, diagnostic instruments, microscopes and imaging systems.

• Structural design: 1/3 octave bandwidths, 1 Hz–100 Hz frequency span.• Manufacturers’ vibration sensitive instruments and equipment vibration tolerance criteria often in narrow bandwidths over various frequency spans

• Resonances and sensitivities to discrete frequencies of apparatus disturbance.

• FGI 2010 recommends

• 4k mips* for operating, treatment, lab and patient rooms • 8k mips* for administrative areas and public circulation.

• FGI 2014 relaxes patient rooms and other patient areas to 6k mips*. *µ‐in/sec velocity (peak)

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3 Environmental Noise

Architect’s perspective rendition of completed hospital, view from east.

Patient Rooms2‐PadHeliport

Lobby

Chapel

Office& Shell

OfficesConference &Break rooms

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3.1 Existing Noise Environment

Environmental sound monitoring results (existing noise), LA(n)

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3.2 Future Noise Environment

Modeled flight pathsFlight path layout provided by

heliport planners8/12/15 18



Heliport event noise (Lmax) at Level 7 for representative

flight paths with predominant Austin wind conditions

Regarding FGI, Lmax was used to determine an average hourly nominal maximum (L01).With fewer than 1 flight per hour average anticipated , the L01 would be less than Lmax.

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Heliport Noise Exposure Results Indicating FGI 2010 Noise Categories

To achieve FGI, we need higher OITC/STC ratings for some windows.8/12/15 20



Façade and Glazing Exposure and Minimum Noise Reduction Guide

Exposure Category:System:

MinimalA

ModerateB

SignificantC

Outdoor‐Indoor Transmission Class (OITC) not less than: 24 26 28

Minimum Sound Transmission Class (STC) not less than: 28 32 35

• Also, minimum TL values >30 dB at 1‐2 kHz to isolate high‐frequency siren & horn sounds. • Plus minimum values >22 dB between 100‐250 Hz to isolate low‐frequency sounds.• Also, apply unbalanced glazing with inner and outer panes of different thickness.

Example: 9 mm (3/8") inner pane with 5 mm (3/16") outer pane.

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Roofs need enough mass to reduce low frequency noise intrusion and impulse from helicopter blade slap.

• Add mass layer > 10 kg/m2 (2 psf) between roofing membrane and insulation, such as mass‐loaded vinyl or layer of gypsum.

• Acoustically seal penetrations through exterior.

• Add sound barrier lagging to roof drains and other piping penetrating roof deck, unless enclosed in shafts.

• Add mass/enclosure to certain rooftop ductwork:• Enclose rooftop exhaust ducts below heliport.• Use 18‐gauge sheet metal for rooftop supply and return ducts.

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4.1 Architectural Room Acoustics/ Sound Isolation, Sound Privacy

• Determine FGI‐listed room demising assemblies’ sound transmission losses, STC/STCc.

• Goals: achieve the project Basis of Design Acoustical Criteria and LEED requirement.

• Tactics:

• acoustically separate adjacent rooms based on probable source room sound levels and ambient or background levels in receiving rooms.

• decreases room‐to‐room transmission of airborne sound.

• reduce room to corridor noise

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4.2 Architectural Room Acoustics/ Sound Absorption

• Goals:• Improve speech and listening conditions within rooms by modifying configuration, shape or furnishing layout to reduce distance between sound source (person speaking) and receiver (person/people listening).

• Place similar function spaces adjacent to or above each other to decrease noise disturbance between rooms with differing uses, such as patient above patient, exam next to exam.

• Tactics: • Decide appropriate room surface finishes to improve speech intelligibility or good communications using acoustically absorptive, diffusive and reflective materials to control reverberation and reflection patterns.

• Determine reverberation times for sensitive spaces.• Add acoustically absorptive wall finishes to increase room absorption and control reflections control especially in sensitive spaces, such as video or teleconferencing, recording/editing, etc.

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5 Indoor Mechanical Equipment and Environmental Noise

• Situation:• Noise produced by building systems equipment, such as mechanical/HVAC, electrical, plumbing (MEP) and

elevator systems, contributes to the continuous ambient noise in spaces.

• Goal:• Quiet ambient noise levels improve speech perception and allow for a large dynamic range for sound,

making the nuances of speech more audible and understandable.

• Tactics: • Neutralize tonal noise spectra of MEP and HVAC sources.• Maintain a minimum continuous ambient noise levels with HVAC and MEP in conformance with permissible criteria, to reduce variability of cyclical and transient noise distractions.

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Approach to Noise Reduction in Building Designs: Spectrum Neutralization

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‐20

‐10

0

10

20

30

40

50

60

63 125 250 500 1k 2k 4k 8k

Tonal Source

Attenuated Result

Attenuation

Example of Tonal sound source with matched attenuation and smooth spectrum result.


5.1 Central Plant, Engine‐Generator & Exterior Building Systems Equipment

• Generator Equipment Room:• Engine exhaust and radiated noise spectra evaluated to determine noise containment and

attenuation requirements. • The pre‐selected reactive muffler conforms to criteria for engine exhaust noise,

• otherwise would have been prescriptively specified ~45 dBA attenuation• Body diameter and length > 3x and 10x inlet pipe diameter, respectively.

• Tactics:• OITC > 65 demising partition required at occupied space adjacency and OITC > 55 required for

exterior walls.• Inlet and radiator discharge wall openings required deep acoustic louvers or sound attenuator banks

inside architectural louvers• Attention to static pressure limitations of radiator fan. • Contingent recommendation permitted small reduction of acoustic louver or attenuator insertion

losses if 2”‐4” acoustically absorptive surface finishes are placed on > 30% of generator room surface area.

• Vibration isolation was required for the engine generator rail base (essentially constant weight load, because day fuel tank is remote from engine base).

• Vibration isolation hangers were recommended for engine exhaust muffler and pipe.

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5.2 Interior Building Systems/Mechanical Noise

• Situation: The Interior buildings systems design evaluation for noise indicated air handler unit (AHUs) and mechanical equipment rooms (MER) noise exceed criteria.

• Some Solution Choices:• Dynamic insertion losses (DIL) were scheduled for each AHU system, based on FGI‐listed spaces,

• Locate air terminal devices above areas with a noise criteria RC‐40 or greater,

• Altering aspects of the ductwork in order to reduce noise transmission,• Duct lagging or acoustical enclosure, • Coordinate architectural and mechanical noise control measures by increasing the transmission loss of the ceiling tile with CAC ≥ 40 and NRC ≥ 0.65 in non‐sensitive rooms and corridors.

• Exhaust systems attenuation require special consideration for kitchens and labs.

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5.3 Building Equipment Vibration Isolation

Tactics:• Provide flexible couplings for pipe connections. • Occupied Sensitive Space (immediately above or below): install vibration isolators in stanchion or hanger supports for pipes connected to AHUs and/or pumps in MERs.

• Install static deflection internal fan‐motor vibration isolators or springs isolators where required.

• Provide pad or machine mounts under AHU casing / mounting points or under housekeeping pad.

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Bit of a Balancing Act….

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AcknowledgmentsSeton Healthcare Family of Ascension Health,HKS Architects, University of Texas at Austin &Dell Seton Medical Center at The Univ. of Texas

References

• Guidelines for Design and Construction of Health Care Facilities – FGI 2010 Edition, ASHE (American Society for Healthcare Engineering of the American Hospital Association, Chicago, (2010)

• ASHRAE Handbook of HVAC Applications. “Sound and Vibration Control,” Chap. 48. Pg.48.2, American Society of Heating Refrigerating and Air‐Conditioning Engineers, Inc., Atlanta (2011).

• Guidelines for Design and Construction of Health Care Facilities – FGI 2014 Edition, ASHE (American Society for Healthcare Engineering of the American Hospital Association, Chicago, (2014)

• LEED BD+C Healthcare: U.S. Green Building Council, Washington, DC (2009)• U.S. Public Law 104‐91• http://aspe.hhs.gov/admnsimp/pl104191.htm• Ibid, ASHRAE, Fig. 31, p. 47.32.• Standard Classification for Determination of Outdoor‐Indoor Transmission Class, ASTM E1332‐90 (1998), American Society for Testing and

Materials, West Conshohocken, PA. (1990)• C.N. Himmel, “UT‐Dell Medical School, Phases B, C, Environmental Noise Monitoring Results,” (Unpublished report), JEAcoustics, (Feb,

2014).• C.N. Himmel, “DSMCUT Environmental Noise,” (Unpublished report), JEAcoustics, (Jan, 2015).• Quirt, J.D. Sound transmission through windows; II. Double and triple glazing. Journal of the Acoustical Society of America, Vol. 74, p. 534‐

542. (1983).• J.B. Evans and C.H. Wiese, “DSMCUT Architectural Acoustics,” (Unpublished report), JEAcoustics, (Jan, 2015).• J.B. Evans and C.H. Wiese, “Final DSMCUT Mechanical Noise” (Unpublished report), JEAcoustics, (Jan, 2015).• J.B. Evans and C.H. Wiese, “DSMCUT Engine‐Generator Noise & Vibration,” (Unpublished report). JEAcoustics, (Jan, 2015).

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Thank you for your attentionAny Questions?

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