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Mechanical, Electrical, and Plumbing Introduction Lee Harrelson, PE, LEED ® AP Principal, TM/R Engineering. Agenda. Building Systems Planning Room Sizes and Area %’s Mechanical Systems Equipment Identification and Application Considerations Outside Air Electrical Systems

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Mechanical electrical and plumbing introduction lee harrelson pe leed ap principal tm r engineering l.jpg

Mechanical, Electrical, and Plumbing IntroductionLee Harrelson, PE, LEED® APPrincipal, TM/R Engineering


Agenda l.jpg
Agenda

  • Building Systems Planning

    • Room Sizes and Area %’s

  • Mechanical Systems

    • Equipment Identification and Application Considerations

    • Outside Air

  • Electrical Systems

    • Equipment Identification and Application Considerations

    • Energy Code Considerations

  • Plumbing Systems

    • Equipment Identification and Application Considerations


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Building Planning

  • Q: How much space for MEP systems?

  • A: Who knows? It depends on many factors: However, this website is a great starting point.

http://www.repwars.com/PSP/mechroom.html


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Mechanical Systems

  • Packaged Rooftop AHUs

    • Application Considerations

      • Exhaust fans more than 10 feet away from OA intake

      • Roof slopes coordinated with equipment

      • Clearance on one side of unit equal to unit width

http://www.trane.com


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Mechanical Systems

  • Modular Indoor AHUs

    • Application Considerations

      • Clearance on one side of unit equal to unit width

      • Space for duct connections (large turning radius)

http://www.trane.com


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Mechanical Systems

  • Fan Coil Unit

    • Application Considerations

      • Cannot place systems furniture partitions in front of unit

      • Minimal air-throw, cannot serve large space

      • Can be concealed in a perimeter millwork “bench”

http://www.trane.com


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Mechanical Systems

  • Air-Cooled Chiller

    • Application Considerations

      • Located Outdoors

      • Very Noisy

      • No harmful plume

http://www.trane.com


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Mechanical Systems

  • Water-Cooled Chiller

    • Application Considerations

      • Located Indoors, but extremely noisy

      • Needs 5 feet clearance on 3 sides and entire length of unit on end

      • Must be connected to a Cooling Tower (outside)

http://www.trane.com


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Mechanical Systems

  • Open Cooling Tower

    • Application Considerations

      • Located outdoors, noise and vibration

      • Emits a saturated air plume which can cause damage to nearby buildings

      • Screening must have high free area

http://www.baltimoreaircoil.com


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Mechanical Systems

  • Outside Air Requirements

    • Fresh Air is brought into the building to dilute the contaminants in the space.

      • Offices – 7 people/1000 ft2 and 20 CFM/person

      • Auditoriums – 150 people/1000 ft2 and 15 CFM/person

      • Classrooms – 50 people/1000 ft2 and 15 CFM/person

      • Libraries – 20 people/1000 ft2 and 15 CFM/person

      • Corridors and Storage – 0.10 CFM/ft

    • Why does this matter?

      • Large duct sizes, excessive loads that strain existing infrastructure requiring more mechanical space.


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Mechanical Systems

  • Duct Shaft Sizing

    • How much space required for mechanical duct chases?

      • Rule of Thumb – Assume 1 CFM per square foot and assume 1000 feet per minute duct velocity

      • Example: Suppose an AHU serves a 20,000 ft2 floorplate. The AHU is located in the basement and serves the 2nd floor.

        • 20,000 ft2 needs roughly 20,000 CFM or 20,000 ft3/minute

        • Divide 20,000 ft3/minute by 1000 feet/minute to get duct cross sectional area.

        • 20,000/1000 = 20 ft2 required duct area

        • Remember…that’s just for the supply duct! We also have a return duct, outside air duct, exhaust ducts and we need space for piping.


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Electrical Systems

  • Transformers

    • Application Considerations

      • Near electrical service entrance, inside or outside

      • Generate lots of heat

      • Service clearance depending on voltage, 3 to 5 feet typically


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Electrical Systems

  • Switchgear

    • Application Considerations

      • Service clearance depending on voltage, typically 3 to 5 feet


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Electrical Systems

  • Distribution Panel boards

    • Application Considerations

      • Service clearance depending on

        voltage, typically 3 feet


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Electrical Systems

  • Bus duct Risers

    • Application Considerations

      • Should not offset. Bends are

        large, expensive, and very difficult

        to install

      • Space is required around the bus

        duct to install the disconnect

        switches


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Electrical Systems

  • Electrical Room Stacking

    • Application Considerations

      • Prevents offsetting of vertical power distribution such as bus ducts or cable in conduit

      • Increases system efficiency by reducing cabling run distances


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Electrical Systems

  • Energy Code and Lighting Power Allowances

    • Application Considerations

      • Most code reviewers are enforcing the International Energy Efficiency Code – 2003.

        • 1.1 watts/ft2 for offices

        • 1.4 watts/ft2 for classrooms and lecture halls

        • 1.9 watts/ft2 for workshops areas

        • 0.9 watts/ft2 for corridors

      • This often precludes reuse of existing inefficient lighting in renovation projects. T-5 fixtures are preferred.


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Plumbing Systems

  • Plumbing Piping

Note: Drains sloped at 1/4” to 1/8” per foot of run depending on size

Hubless Sanitary Vent Piping

Hubless Sanitary Drain Piping

Storm Drain Piping

Insulated Domestic Cold Water Piping


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Plumbing Systems

  • Double Check Backflow Preventers

    • Application Considerations

      • Used to prevent contamination of city water supply

      • Installed at water service entrance to building

      • Typically require a floor drain

      • Must be accessible for

        inspection and repair


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Plumbing Systems

  • Roof Drains

    • Application Considerations

      • If parapet wall is installed, a secondary drain path must be provided to discharge above grade. Use scuppers or internal secondary system which is very costly.

      • Must drain by gravity


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Plumbing Systems

  • Toilet Room Stacking

    • Should stack to minimize drainage stack offsets.

      • Drainage stack offsets (a bend greater than 45o) must be separately vented, increasing cost and required space

      • Venting is required to prevent backpressure in the piping, which will prevent proper draining


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Plumbing Systems

  • Toilet Room Stacking

    • Venting an offset


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Plumbing Systems

  • Stormwater Harvesting

http://www.constructionresources.com/images/products/services/rainwater_system.jpg


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MEP Introduction

  • Questions?


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