8-120-09 Systems Alternatives and Options .pdf

8/12/2009

System Alternatives System Description Alt.

Est.Capacity

Cooling Est. Capacity

Heating Special Requirements General Requirements/Comments Electrical Requirements/Comments

HVAC Systems:

Central station variable air volume AHU's (VAV) in existing fan rooms, centrifugal chiller plant w/roof mounted cooling towers, condensing type boilers, dedicated heat recov. MUA unit(s), dedicated 24/7 condenser water system

1 1050 tons max. 15000 max. Disconnect Motor Pool building from Whipple boiler plant

AHU's and dedicated makeup air units located in existing fan rooms ducting to shafts, systems serving multiple floors with floor x floor isolation dampers - perimeter finned tube radiation required for winter heating, dedicated fluid cooler/condenser water system on roof, perimeter finned tube radiation required at walls/window areas that exceed 400 btuh/lineal foot of exposed area

1. Remove existing motor control centers and distribution panels and provide new motor control centers for equipment grouped together with at least eight motors in a room.

2. Provide distribution panels for equipment on variable speed drives.

3. Provide connection (conduit and wiring) and power distribution infrastructure to support geothermal well field pumps and heat pumps located throughout the building in the basement, ground floor, first floor, second floor, third floor, fourth floor, fifth floor and sixth floor.

4. Disconnect and remove existing air handling systems and make up air units in existing mechanical rooms.

5. Provide appropriately sized wire and conduit to accommodate new loads for Air Handling units.

6. Also provide starters (when applicable), disconnect switches (when applicable), connection to VFD's (when applicable) for new AHU's and make up air units located in second floor and on roof. Provide connection to recovery units that will be located in existing mechanical rooms in 2nd floor and 7th floor.

7. Provide connection to Geothermal Condenser Water System Pumps- (2 base mounted pumps for condenser water systems).

8. Make connection to VFD's (and furnish if applicable) for these pumps.

9. Provide connection for new Boilers.

10. Provide connection to four dual fuel boilers and associated pumps and VFDs.

11. Provide new 277/480V power risers and distribution for heat pumps on floors.

12. Refer to mechanical narrative for quantities and locations of equipment.

Floor x floor central station variable air volume AHU's (VAV) in new fan rooms on the floors served, centrifugal chiller plant w/roof mounted cooling towers, condensing type boilers, dedicated heat recov. MUA unit(s), dedicated 24/7 condenser water system

2 1050 tons max. 15000 max. New mechanical rooms required on each floor, disconnect Motor Pool building from Whipple boiler plant

AHU's located on floors served (in new mechanical rooms), dedicated makeup air units located in existing fan rooms, perimeter finned tube radiation required at walls/window areas that exceed 400 btuh/lineal foot exposed area, dedicated fluid cooler/condenser water system on roof

1. Remove existing motor control centers and distribution panels and provide new motor control centers for equipment grouped together with at least eight motors in a room.

2. Provide distribution panels for equipment on variable speed drives.

3. Disconnect and remove existing Air Handling Systems and Make Up Air Units in fan rooms.

4. Provide appropriately sized wire and conduit to accommodate new loads.

5. Also provide starters (when applicable), disconnect switches (when applicable), connection to VFD's (when applicable) for heat pump AHU's located on second floor and penthouse.

6. Provide connection to air/recovery units that will be located in existing mechanical rooms on 2nd floor and 7th floor.

7. Provide connection to Geothermal Condenser Water System Pumps- (2 base mounted pumps for condenser water systems).

8. Make connection to VFD's (and furnish if applicable) for these pumps.

9. Provide connection to five dual fuel boilers and associated pumps and VFDs.

10. Refer to mechanical narrative for quantities and locations of equipment.

Geothermal Well Water Systems - Incremental (nominal 1 ton to 5 ton capacity each) Zone Heat Pumps in ceilings, Dedicated Heat Recovery MUA Units, Heat Pump Boilers, backup 24/7 condenser wtaer system

3 1050 tons max. 9000 max. 300,000 to 350,000 sq. ft. of well field area required - large portion of parking surface area required

Ceiling space for heat pumps, heat recovery units located in 2nd floor and penthouse mechanical rooms, backup 24/7 fluid cooler/condenser water system on roof, perimeter finned tube radiation required at walls/window areas that exceed 400 btuh/lineal foot of exposed area

1. Remove existing motor control centers and distribution panels and provide new motor control centers for equipment grouped together with at least eight motors in a room.

2. Provide distribution panels for equipment on variable speed drives.

3. Disconnect and remove existing air handling systems and make up air units in fan rooms.

4. Provide appropriately sized wire and conduit to accommodate new loads.

5. Also provide starters (when applicable), disconnect switches (when applicable), connection to VFD's (when applicable) for new AHU's and make up air units located in basement, second floor, loading dock and penthouse.

6. Provide connection to heat recovery units that will be located in existing mechanical rooms in 2nd and 7th floor.

7. Refer to mechanical narrative for quantities and locations of equipment.

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System Description Alt.

Est.Capacity

Cooling Est. Capacity

Heating Special Requirements General Requirements/Comments Electrical Requirements/Comments

Geothermal Well Water Systems - Large capacity Floor x Floor variable speed drive Heat Pump air handling units supplying variable air volume boxes, dedicated heat recovery MUA Units, Condensing Type Boilers, backup 24/7 condenser water system

4 1050 tons max. 12000 max. 300,000 to 350,000 sq. ft. of well field area required - large portion of parking surface area required

AHU's located on floors served (in new mechanical rooms), dedicated makeup air units located in existing fan rooms, backup 24/7 fluid cooler/condenser water system on roof, perimeter finned tube radiation required at walls/window areas that exceed 400 btuh/lineal foot of exposed area

1. Remove existing motor control centers and distribution panels and provide new motor control centers for equipment grouped together with at least eight motors in a room.

2. Provide distribution panels for equipment on variable speed drives.

3. Disconnect and remove existing Air Handling Systems and Make Up Air Units in fan rooms.

4. Provide appropriately sized wire and conduit to accommodate new loads.

5. Also provide starters (when applicable), disconnect switches (when applicable), connection to VFD's (when applicable) for heat pump AHU's located in basement, second floor and penthouse.

6. Provide connection to air/recovery units that will be located in existing mechanical rooms on 2nd floor and 7th floor.

7. Provide connection to Geothermal Condenser Water System Pumps- (2 base mounted pumps for condenser water systems).

8. Make connection to VFD's (and furnish if applicable) for these pumps.

9. Provide connection to dual fuel boilers and associated pumps and VFDs.

10. Refer to mechanical narrative for quantities and locations of equipment.

Small Geothermal Well Field to support 50 to 100 tons of building critical 24/7 loads (computer rooms, communications rooms), centrifugal chiller plant, condensing type boilers, Central station AHU's (VAV) on each floor served, dedicated heat recov.

MUA unit(s), condensing boilers

5 NOT

VIABLE -

This option is deleted

NOT VIABLE - This option is deleted

New central station variable air volume AHU's (VAV) in existing fan rooms, re-use the existing centrifugal chiller plant w/existing roof mounted cooling towers, re-use the existing boiler plant, new dedicated heat recov. MUA unit(s), dedicated 24/7 condenser water system

6 Current capacity Current capacity Possible new air shaft locations may be required, chiller and boiler plants are oversized for current and anticipated future building loads

AHU's and dedicated makeup air units located in existing fan rooms ducting to shafts, systems serving multiple floors with floor x floor isolation dampers - dedicated fluid cooler/condenser water system on roof, perimeter finned tube radiation required at walls/window areas that exceed 400 btuh/lineal foot of exposed area

1. Remove existing motor control centers and distribution panels and provide new motor control centers for equipment grouped together with at least eight motors in a room.

2. Provide distribution panels for equipment on variable speed drives.

3. Disconnect and remove existing air handling systems and make up air units in fan rooms.

4. Provide appropriately sized wire and conduit to accommodate new loads.

5. Also provide starters (when applicable), disconnect switches (when applicable), connection to VFD's (when applicable) for new AHU's and make up air units located in basement, second floor, loading dock and penthouse.

6. Provide connection to heat recovery units that will be located in existing mechanical rooms in 2nd and 7th floor.

7. Refer to mechanical narrative for quantities and locations of equipment.

HVAC Options

Variable primary pumping systems for options 3, 4 and 5 chillers

NOT

VIABLE -

This option is deleted

NOT VIABLE - This option is deleted

Ice Storage to reduce summer demand charges

Space required for ice storage system

Possible reduced size of the chiller plant, off peak electrical rates/lower demand charges

High efficiency (85% to possibly 87%) boilers operating at conventional (190 F. - 170 F) water temperatures

Conventional flue stack required

Smaller coils, reduced flow requirements

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System Description Alt.

Est.Capacity

Cooling Est. Capacity

Heating Special Requirements General Requirements/Comments Electrical Requirements/Comments

Plumbing Options Low flow fixtures LEED Solar hot water heating LEED and GSA req'd Gray water storage, toilet/urinal supply Tank(s) inside building & filtering req'd.

Gray water to serve non-potable plumbing systems such as toilets, urinals, possibly for cooling tower water source and heating system fill

Low Temperature (120 F. max.) domestic solar/gas heated hot water serving building

Requires point of use booster heating at cafeteria dishwashers, sinks, etc.

Energy savings at reduced water temperatures

Electrical Options LEED for 2009 for Commercial Interior, Site Selection, Credit 1: Light Pollution Reduction

LEED Could be applied if using mechanical system alternatives 3 or 4.

LEED for 2009 for Commercial Interior, Energy and Atmosphere, Credit 1.1:

Optimize Energy Performance - Lighting Power 15%, 20%, 25%, 30%, 35% increments up to 5 points

LEED

LEED FOR 2009 for Commercial Interior, Energy and Atmosphere, Credit 1.2:

Optimize Energy Performance - Lighting Controls, Daylighting Controls for Daylit areas, Daylight Controls for 50% of the Lighting Load, Occupancy Sensors for 75% of the Connected Lighting Load

LEED

LEED for 2009 for Commercial Interior, Energy and Atmosphere, Credit 1.4:

Optimize Energy Performance - Equipment and Appliances

LEED 1 point can be earned if "Energy Star" qualified equipment is selected for a minimum of 70% of space (7% increments earns extra points, up to 4 points). The requirement applies to appliances, office equipment, electronics and commercial food service equipment.

LEED for 2009 Commercial Interior, Energy and Atmosphere, Credit 3: Measurement and Verification - Install Sub-metering Equipment, Tenant Pays for Energy, or Metering, Measurement and Payment Accountability

LEED

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System Description Alt.

Est.Capacity

Cooling Est. Capacity

Heating Special Requirements General Requirements/Comments Electrical Requirements/Comments

LEED for 2009 for Commercial Interior, Energy and Atmosphere, Credit 4: Green Power

LEED 5 points can be earned if a 2-yr contract is added when purchasing Green Power from the Grid to provide power to 50% of the space.

Option 1: The quantity of Electricity that needs to be purchased will depend on what mechanical alternative we chose. Option 2: We would need to have a 2 year contract to purchase atleast 5507.6 MWH (8KWH/ SQ-FT) of electricity per year.

LEED for 2009 Commercial Interior, Innovation in Design, Credit 1.4:

LEED Low Mercury Lighting (Lamps)

LEED for 2009 Commercial Interior, Innovation in Design, ID Credit 1.5:

LEED and beyond: Will investigate both fixed and tracking PV systems as part of "green roof" and as free-standing system on site. Also investigat wind turbines. Will base sizing on winter demand, with add capacity to cover summer peak demand as options.

On site generation of Electricity, using wind turbines or solar energy. Option 1: Wind Turbines can be used to generate winter loads (approximately 1 MW) at a cost of approximately $1.7M. Option 2: We could also use Photovoltaics to generate 1MW at an cost of approximately $5.65M. Option 3: We are investigating the feasibility and cost of electricity generation using a combination of both solar and wind energy.

LEED for 2009 Commercial Interior, ID Credit 1.5: Innovation in Design

Use of Premium Efficiency Low Voltage Transformers for power distribution. These transformers are 30% more efficient than the minimum Energy Efficiency standards.

Lighting Options

Lighting Fixtures

Provide Low-Mercury Fluorescent Lamp Sources

5 LEED All mercury containing lamps shall contain less than 100 picograms per lumen hour light output

LED decorative lighting Any decorative lighting features could utilize long life LED sources. Advantages: reduce maintenance and reduce overall power density

Replace existing office lighting system with Linear Direct/Indirect Super T8 or T5 Fluorescent Fixtures

2 High efficiency linear direct/indirect pendants for increased spacing, better lighting quality.

Useful for instances with less plenum space.

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System Description Alt.

Est.Capacity

Cooling Est. Capacity

Heating Special Requirements General Requirements/Comments Electrical Requirements/Comments or Replace existing office lighting system with high efficiency Semi-recessed T5 Fluorescent Fixtures

3 Semi-recessed high efficiency lighting for increased spacing, ceiling integration ( ex.

Armstrong ceiling system), better lighting quality

Provide individually controlled LED task lighting as supplement to ambient light

LED or fluorescent task lighting used as a supplement to lower overall ambient lighting level (30fc). This would be used in conjunction with direct/indirect lighting.

Fluorescent dimming 4 Utilize step dimming ballast to integrate with daylight sensor of control systems. Provide multiple illuminance levels within a space.

Lighting Control

Daylight sensors in open office areas with adequate daylight exposure

GSA Required, LEED

Daylight Sensors integrated into new lighting control system and fixtures. Daylight study may be needed to examine feasibility with existing envelope.

Occupancy sensors in private office areas and enclosed spaces

GSA Required, LEED

Relay system for automatic shutoff and time-of-day control

MN Energy Code Utilizes relay controls, photo sensors, and/or astronomical time clock. Required to meet current energy code.

Bi-level switching MN Energy Code Provide multiple levels of switching per fixture.

Required to meet energy code.

DALI addressable ballasts and control system for lighting control

1 Workstation specific lighting that provides maximum flexibility for individuals. Occupancy and dimming sensors would be utilized for each space as well as a software system that would be controlled personally by the occupant.

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