2022 05 06 MEP Narrative.pdf

5145 Livernois, Suite 100 | Troy, MI 48098-3276 | Tel: 248-879-5666 | Fax: 248-879-0007 www.PeterBassoAssociates.com

DESCRIPTION OF MECHANICAL AND ELECTRICAL SYSTEMS

CONSTRUCTION DOCUMENT NARRATIVE

GHF GSA TLUSCH Capital Security Project

Detroit, MI

PBA Project No. 2021.0206.00

May 6, 2022

[Insert Project Name] Project No. [Insert Project No.]

[Insert Project Location][

[Insert Date]

GHF GSA TLUSCH Capital Security Project PBA Project No. 2021.0206.00

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Building Code Review Summary

Codes and Standards of Jurisdiction

2021 international Building Code

2021 International Mechanical Code

2021 International Plumbing Code

2021 International Energy Conservation Code

2021 International Fire Code

ASHRAE 90.1-2019 Energy Standard

NFPA 70 - National Electrical Code 2020 Edition

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Mechanical Systems Design Narrative

Outdoor Conditions

Summer 90.3 F DB

74.0 F WB

Winter -10 F DB

0% RH

Notes:

Outdoor design conditions based on 2017 ASHRAE Fundamentals climatic design data.

Indoor Conditions

Rooms Summer °F Winter °F Humidification

Corridors and Lobby 75 F DB 72 F DB 60% Max – Summer

No Humidification - Winter

Sallyport No Cooling 68 F DB 60% Max – Summer

No Humidification - Winter

Security Booth 75 F DB 72 F DB 60% Max – Summer

No Humidification - Winter

Conference Room 75 F DB 72 F DB 60% Max – Summer

No Humidification - Winter

Storage 75 F DB 72 F DB 60% Max – Summer

No Humidification - Winter

Break Room 2 75 F DB 72 F DB 60% Max – Summer

No Humidification - Winter

Elevator Lobby 75 F DB 72 F DB 60% Max – Summer

No Humidification - Winter

Holding Cells 75 F DB 72 F DB 60% Max – Summer

No Humidification - Winter

Electrical Room 3 No Cooling No heating No Humidification

Vestibule No Cooling 60 F DB No Humidification

Notes:

1. Summer relative humidity is not directly controlled. The indicated summer indoor relative humidity is the condition that can be expected under normal operating conditions at the design outdoor air temperature and humidity.

2. The Break Room space will not be designed for food preparation.

3. A ventilation fan will be provided to maintain the maximum 78 F DB temperature in the space.

Outside Air Ventilation Rates

Outside air ventilation rates will be in accordance with the 2021 International Mechanical Code, Table

403.3.1.1 and ASHRAE 62.1-2013, Table 6-1.

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Air Change Rates

Minimum air flow rates will be as follows:

Holding Cells:

12 air changes/hour (exhausted to outdoors).

Sallyport:

4 air changes/hour (exhausted to outdoors).

Indoor Noise Criteria

Space Room Criteria1,2

Lobby RC(N) 40

Break Room RC(N) 40

Enclosed Office RC(N) 30

Storage RC(N) 40

Notes:

1. RC based on 2019 ASHRAE Applications, Chapter 48, Table 1: Design Guidelines for HVAC Related

Background Sounds in Rooms.

1. Value and ranges are based on judgement and experience and represents general limits of acceptability for typical building occupancies.

Thermostatic Zoning

Thermostatic zoning will be as indicated on the drawings.

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Duct Sizing Criteria

System Velocity Friction per 100 ft.

Supply Air Ductwork – Overhead in occupied spaces, between fan and air terminal unit

1800 fpm maximum velocity 0.25”/100 ft. maximum air pressure drop

Supply Air Ductwork –

Downstream of air terminal units 1000 fpm maximum velocity

0.10”/100 ft. maximum air pressure drop

Return/Exhaust Air Ductwork –

Overhead in occupied spaces 1000 fpm maximum velocity

0.10”/100 ft. maximum air pressure drop

Transfer Air Ductwork –

Overhead in occupied spaces 300 fpm maximum velocity

0.10”/100 ft. maximum air pressure drop

Mech/Elec Room Ventilation

Ductwork 1500 fpm maximum velocity

0.10”/100 ft. maximum air pressure drop

Notes:

All ductwork serving secure rooms such as holding cells will be provided with security grade man bars where ductwork is greater than 96 sq. in.

Pipe Sizing Criteria

HVAC Piping 2" Size and Smaller 10 fps Maximum velocity

Maximum water pressure drop:

4.0 ft. hd./100 ft. equivalent length

HVAC Piping 2-1/2" Size and Smaller 10 fps Maximum velocity

Maximum water pressure drop:

4.0 ft. hd./100 ft. equivalent length

Domestic Water Feed Mains and

Risers 7 fps Maximum velocity

Maximum water pressure drop:

3.0 ft. hd./100 ft. equivalent length

Domestic Water Branch Piping 4 fps Maximum velocity

Maximum water pressure drop:

3.0 ft. hd./100 ft. equivalent length

Utilities

The existing utilities will remain. The current project does not include any new utilities for the building.

Heating System

The existing heating system will remain. The hot water heating piping system will be modified and extended to accommodate the renovated spaces. Existing steam piping will be removed in areas where walls or equipment are being removed, exposing existing steam piping. All removed steam piping will be capped at their piping mains.

Cooling System

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The existing cooling system will remain. The chilled water piping system will be modified and extended to accommodate the renovated spaces.

Air Handling Systems

Basement:

Vehicle Sallyport

The existing steam unit heater and associated steam piping will be removed from the area. The current unit heater is inactive.

The existing garage gas ventilation system consists of two sidewall propeller exhaust fans along the West wall. These fans will be removed and the existing louver will be capped.

The loading dock will be exhausted by two inline exhaust fans. The fans will be located in the

Electrical Room in the northeast corner of the Basement. These fans will be connected to a relocated louver on the exterior wall. Two decommissioned propeller fans in the wall between the electrical room and the loading dock will be removed and replaced with a new sidewall grille. The exhaust air will not be directly ducted from the loading dock to these fans but will pull the air through the electrical room to help ventilate this space.

There is currently no outside air being supplied to the basement garage. The original base mounted fan that exhausted the garage will be removed. Two new inline supply fans will be connected to the existing duct riser that exits through the elevator penthouse. This ductwork has an existing heating coil and pump that will be recommissioned. The fans will supply the outside air to the Sallyport, Loading Dock and Judge’s Parking Garage areas. The outside air will be transferred from the Loading Dock to the Sallyport and Judge’s Parking Garage through multiple transfer openings.

The existing gas detection sensors in the loading dock will be replaced. The new locations will be determined based on the sensor installation requirements.

A dedicate gas detection system will be provided for the new enclosed area of the Sallyport. The

Sallyport will be ventilated by an inline exhaust fan located along the west wall in the Electrical

Room adjacent to the Sallyport. The fan will be variable speed. During normal mode, the fan will provide the minimum 4 air changes an hour which is equivalent to 800 CFM. When the gas detection system is alarmed, the fan will increase to 900 CFM to meet the code minimum exhaust rate of 0.75 CFM/sf of room area. New NO and CO2 sensors will be installed and interfaced with the new exhaust fan.

A 4200 BTUH hot water unit heater will be provided in the Sallyport to maintain the minimum heating requirements in the area. The unit heater will be controlled by a line voltage thermostat.

Ventilation air to the Man Trap will be provided from the existing AHU-B-1. AHU-B-1 is located in the basement adjacent to the fitness area. A hot water terminal unit will be connected to the

Page-8 existing ductwork and routed to Sallyport corridor. The supply air will be transferred into the man trap. A side wall grille will discharge the minimum required ventilation air into the room. The supply ductwork penetrating the partition wall will contain man bars for security purposes. The terminal unit will provide pressurization for the room to maintain a positive pressurization in relation to the Sallyport. Positive pressurization of this space is required by the mechanical code.

The terminal unit serving the Man Trap will also supply the Sallyport elevator lobby. A side wall grille will discharge the minimum required ventilation air into the room. The terminal unit will provide pressurization for the room to maintain a positive pressurization in relation to the

Sallyport. Positive pressurization of this space is required by the mechanical code. A 3500 BTUH hot water unit heater will be provided in the elevator lobby to maintain the minimum heating requirements in the area. The terminal unit and unit heater will be controlled by a line voltage thermostat.

An in-line ventilation fan discharging to the Sallyport will be provided for the electrical room.

Make-up air for the electrical room will be through a transfer grille in the door. The fan will be controlled by a line voltage thermostat.

A new electric snowmelt system will serve the Lafayette ramps. The snowmelt control panels will be located in the basement Electrical Room – B43. The snow sensor will be located on the 3rd floor mechanical rooms roof.

First Floor:

North Lafayette

The existing cabinet unit heater within the north wall of the vestibule will be demolished along with all piping associated with the equipment. The existing fan coil unit to the north of the

Lafayette Vestibule will also be removed. All steam and condensate piping associated with this fan coil will be demolished back to the basement and capped at the mains. The existing hot water heating piping routed through the location of the new Lafayette Street lift will be removed and rerouted. The steam radiator located within the existing gun storage area will be removed as well as the existing supply diffuser and return grille.

The vestibule will be provided with a new recessed, sidewall cabinet unit heater will heat the lift entry. The units will be controlled by line voltage thermostats. The hot water will be piped from the Basement. The existing cabinet unit heater on the west side of the vestibule is to remain active.

A horizontal blower coil unit will be provided for the security gate, gun storage, and security booth. The blower coil will be equipped with a hot water heating coil, a chilled water coil, a MERV

8 filter, and ducted supply and return connections. Ceiling mounted supply diffusers and return grilles will be provided in the space and connected to the fan coil ductwork. The unit will be controlled by a line voltage thermostat located within the Security Booth. The hot water will be piped from the Basement through the existing chase near the Gun Storage room. The chilled water will be piped from the main chilled water riser on the First Floor. The ventilation air for the area will be provided from the existing AHU-1-5 that is north of the security gate. A new ceiling mounted diffuser will be connected to the existing supply ductwork that originally served this area from AHU-1-5.

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South Fort Street

Both existing cabinet unit heaters in the vestibule are to remain active.

A horizontal blower coil unit will be provided for the security gate, gun storage, and security booth. The blower coil will be equipped with a hot water heating coil, a chilled water coil, a MERV

8 filter, and ducted supply and return connections. Ceiling mounted supply diffusers and return grilles will be provided in the space and connected to the fan coil ductwork. The unit will be controlled by a line voltage thermostat located within the Security Booth. The hot water and chilled water will be piped from the main water piping on the First Floor. The ventilation air for the area will continue to be provided by the existing air handling unit serving the Lobby.

Second Floor:

The second floor is ventilated by an existing air handling unit (AHU-2-3). Hot water terminal units are installed throughout the floor to modulate the ventilation air within each zone. Hot water piping mains are routed above the ceiling around the floor and connected to the terminal units.

The existing hot water terminal unit, supply ductwork, and return ductwork serving the existing holding cells, conference room and break room will be removed back to their main ductwork. All diffusers and grilles are to be removed within that area of renovation. The existing hot water heating piping serving this terminal unit will be demolished back to the main pipe and capped.

The two new breakrooms and adjacent corridors will each be provided with dedicated hot water terminal units. The hot water piping will be connected to the existing mains on the floor. Ceiling mounted supply diffusers, return grilles and exhaust grilles will be provided in the space. Exhaust air will be removed above the counter tops. The remaining air will be connected to the return air main.

The two new holding cells and secure lobby will be connected to a single energy recovery unit located in the 3rd floor mechanical room. The energy recovery unit will contain a supply fan, exhaust fan, and a plate type heat exchanger. The supply ductwork will be provided with a duct mounted heating coil and duct mounted cooling coil. The hot water and chilled water piping will be connected to the existing mains within the 3rd floor mechanical room. The supply air will be discharged into the lobby and transferred to the holding cells through ceiling mounted grilles.

The ceiling mounted supply diffusers and exhaust grilles will be security grade. Each holding cell will be fully exhausted. The rooms will be negatively pressurized by the exhaust air connection. All duct penetrations of the ceiling will be secured through the use of the security grilles. The exhaust air for the holding cells will be connected to a duct mounted HEPA filter box downstream of the energy recovery unit outlet. The exhaust will discharge to atmosphere through a relief hood on the roof of the 3rd floor mechanical room.

The exhaust air for the breakrooms will be connected to the main exhaust riser located within the restrooms.

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Each terminal unit will be controlled by a line voltage thermostat.

Temperature Control Systems

The existing temperature control panel located where the new Lafayette Street lift is to be installed will be removed and relocated to the adjacent Electrical closet.

The new equipment will be incorporate into the existing Direct Digital Controls (DDC). Stand-alone DDC panels will be networked together within the building and connected to the existing building management system. Individual room air terminal units will also have DDC controllers networked and fully integrated into the building wide system. Each air terminal unit DDC controller will be provided with a room temperature sensor. Automatic unoccupied setback of temperature and airflow will be programmable on an individual terminal unit basis.

Electric type valve and damper actuators will be used on the air terminal unit dampers, air terminal unit tempering coils, and fan coil devices.

A demand-controlled ventilation strategy using space mounted CO2 sensors to modulate ventilation air will be incorporated in all the air handling system serving large occupancy spaces. When the CO2 rises, the ventilation to the space will be increased by first modulating the air terminal unit damper towards full open. If the CO2 concentration continues to rise after the air terminal unit damper is fully open, the outdoor air damper at the air handling unit will modulate towards fully open until CO2 level falls below setpoint.

The temperature controls for the prisoner areas will be connected to a wall mounted controller located in the Command-and-Control Center on the 1st floor. The gas detection systemin the sallyport will also be connected to a monitoring system within the Command-and-Control Center.

Plumbing Systems

Domestic Water System

The existing hot water recirculation piping in the basement under the Fort Street Entrance will be modified if Alternate 1 is chosen.

The existing domestic cold water, hot water, and hot water recirculation piping will be modified and extended to accommodate new plumbing fixtures on the second floor. Thermostatic point of use mixing valves will be provided at all lavatories and sinks.

Sanitary and Vent System

The existing sanitary within the Lafayette Vestibule wall will be relocated as required for the removal of the vestibule wall. The final location for the sanitary riser will be coordinated with existing conditions and the architect.

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The existing sanitary and vent system will be modified and extended for the new plumbing fixtures on the Second Floor.

Natural Gas System

The existing natural gas piping below the Lafayette Street entrance will be modified as required to allow for the structural revisions of the new lift system. All other natural gas piping is to remain.

Plumbing Fixtures

The existing plumbing fixtures in the Breakroom, restroom, and holding cells on the Second Floor are to be removed. All piping associated with the plumbing fixtures shall be removed back to the mains and capped.

Security grade combination lavatory and water closets will be provided within the holding cells on the second floor.

Break room sinks shall be single bowl stainless steel lay in sinks. The faucet shall be wrist blade with a gooseneck spout and basket strainers. Break room sinks shall be provided with a garbage disposal.

All Lavatories and Sinks shall have point of use thermostatic mixing valves. The mixing valve shall be ASSE 1016 listed.

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Electrical Systems Design Narrative

POWER DISTRIBUTION

Vehicle Sallyport

Power will be fed from existing 480/277V and 208/120V panelboards located within electrical closet plan northwest of work as required. Refer to electrical documentation for location.

North Lafayette

Power will be fed from existing 480/277V and 208/120V panelboards located within electrical closet plan north of work as required. Refer to electrical documentation for location.

South Fort Street

Power will be fed from existing 480/277V and 208/120V panelboards located within electrical closet located off of the parking garage in basement. Refer to electrical documentation for location reference.

Exterior Ramp

Power will be fed from existing 480/277V and 208/120V panelboards located within electrical closet plan west of work as required. Refer to electrical documentation for location.

Section Floor – Option 1

Power will be fed from existing 480/277V and 208/120V panelboards

Wiring Devices

New receptacles shall be provided as required and shall be 20 ampere, 125 volt, NEMA 5-20R configuration. A maximum of six receptacles shall be connected per circuit. Special receptacles and dedicated receptacles shall be provided in areas as required. Toilet rooms and all other areas with sinks shall have GFI protected receptacles within six feet of the sinks. Individual GFI receptacles shall be used.

Circuits shall have a dedicated neutral and shared insulated ground.

Special Power Requirements

Surge Protective Device (SPD) is not being provided.

Emergency backup devices and equipment will be fed from existing panelboards that are fed from an existing 1000kW emergency diesel generator located on the roof.

Lighting Systems

All new provided lighting fixtures will be LED. Lighting levels shall be designed to meet the ASHRAE 90.1-

2013 Energy Standard for Building. Levels of illumination shall meet the P100 and US Courts design guidelines. Lighting shall meet the Illuminating Engineering Society (IES) guidelines. Lighting fixtures shall be specification grade and UL listed. Lighting controls will follow ASHRAE 90.1-2013 requirements.

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Illumination for typical Interior spaces – Illuminance (footcandle) levels are shown for horizontal plane, unless noted otherwise.

Room

Calculated

Light Level

Owner

Standards

IES

Recommended

Light Level

Conference Rooms 30(in progress) 30 30

Corridors 10 (in progress) 10 10

General Inactive Storage 10(in progress) 5 5

Gun Closet 28(in progress) 28 20

Lobby 10 (in progress) 10 10

Mechanical/Electrical 30(in progress) 30 10

Private Office Not Applicable 30 50

Toilet Rooms Not Applicable 10 5-10

Sallyport 46(in progress) 46 20

Break Room 10 (in progress) 10 10

Holding Cell 46 (in progress) 46 20

Illumination for typical exterior spaces – Illuminance (footcandle) levels are shown for horizontal plane, unless noted otherwise.

Area

Calculated Light

Level

Owner

Standards

Recommended

Light Level

Building entrances (In progress) Not Defined 5

Building façade (identify surfaces)

(In progress) Not Defined 3-5 (vertical)

Building perimeter (In progress) Not Defined 2

Lighting shall be as follows:

Vehicle Sallyport

A 4ft linear utility fixture will be used in the sallyport area. Recessed secure 1x4 fixtures provided in secure elevator lobby and vestibule. Recessed 2x4 troffer provided in gun closet. Lighting controls will follow

ASHRAE 90.1 2013 requirements as well as be controlled from command center.

North Lafayette

Cove lighting will be replaced in the existing cove feature. A recessed direct 2x2 fixture will be use in the grid lay in the new grid lay in ceiling. An adjustable downlight will be used at the lift. A ceiling mounted dome fixture is to be used in gun closet. Lighting controls will follow ASHRAE 90.1 2013 requirements.

South Fort Street

A new wall mounted fixture will be used to illuminate the working space of the security desk mounted to partition above.

Exterior Ramp

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There will be integrated handrail lighting illuminating the pathway of the new exterior ramp. Two lighted signs provided at each ramp. Lighting controls will follow ASHRAE 90.1 2013 requirements.

Second Floor Option 1

A recessed direct 2x2 basket troffer will be utilized in corridors, conference room, and break room. In detention cells and associated elevator lobby/corridor a 1x4 detention grade recessed mount will be used.

Fire Alarm Systems

New devices will be installed as required and tied into the existing fire alarm system. New devices will include smoke detectors, pull stations, and notification devices as required.

Telecommunications/Data Systems

Raceways and back boxes for telephone and data outlets shall be provided where required.

Security Systems

120V 20A dedicated receptacles will be installed for new x-ray, magnetometer, and future uses per the

USMS Publication requirements.

New security screening stations will be located at both the Lafayette and Fort Street entrances. Power circuits and telecommunication cabling will be relocated from existing stations as required.

Back boxes and conduit will be provided for access control and cameras.

Audio/Visual Systems

Raceways, back boxes, and power for audio/visual systems shall be provided where required.

Telecommunications and Audio/Visual cabling shall share the same conduit where possible. Equipment and wiring for audio/visual systems shall be provided by the Owner.