Zero Net Energy Technical Assistance Program for Municipal - - PowerPoint PPT Presentation

October 2018

Zero Net Energy Technical Assistance Program for Municipal Facilities

Program Services

▪Review portfolio of buildings for ZNE opportunity ▪Support individual new construction projects – energy modelling, and design assistance for ZNE ▪Assess retrofit opportunities, costs and feasibility

• f ZNE

▪Different types of energy efficiency modelling, cost-benefit and support for design teams

Portfolio Projects

City of Brisbane Strategic Portfolio Assistance City of Hayward ZNE

New Construction Projects

Dublin Police Station San Pablo City Hall Millbrae Community Center West Marin Service Center

Retrofit Projects

San Carlos Youth Center Berkeley Live Oak Rec Center Oakland Manzanita Rec Center

Fire station 12 Fire station 25 Fire station 27

Oakland Fire Stations Oakland 911 Dispatch Center

Major Renovation Projects

Richmond Public Works Building

Recreation Center ~ Rebuild ~ Sustainable Measures

City of Millbrae

RICAPS Presentation - October 23, 2018

DESIGN VALUES SUMMARY

OPENING/ENGAGING P ARK OUTDOOR ROOMS (COMMUNITY PORCH) OUTDOOR ROOMS (2ND FLOOR PORCH) MASSING/SCALE MASSING/ MA TERIALS INVITING ENTRY ENTRY FOCAL POINT BUILDING/LANDSCAPE INTEGRATION INTERACTIVE PUBLIC SPACE ENGAGING LANDSCAPE OPEN PASSIVE SPACE SPACE TO PLA Y

BUILDING SITE

8 MILLBRAE RECREATION CENTER

CONCEPTUAL DESIGN ROUND 1 OUTREACH COMPLETED

Event # Attendees Open House ~72 Commu nity Meeti ng ~20 Online Survey ~338 Community Center Kiosk ~11 Farmers’ Market ~145 Self Help for the Elderly Lunch ~50 Taylor Middle School ~185 Lion’s Pancake Breakfast ~86 Movie Night ~50

9 MILLBRAE RECREATION CENTER

CONCEPTUAL DESIGN ROUND 2 SUMMARY COMPLETED

Event # Attendees Online Survey 159 Carriage House Ribbon Cutting 51 Community Festival + Movie Night 45 F O L Book sale + Rummage Sale 51 Movie Night 44 Millbrae Wine Festival 352 Farmers’ Market 104 Self Help for the Elderly Lunch 30 Back to School – Taylor Middle School 23 Community Center Kiosks 24 Open House 46

TOTAL ~ 9 2 9 +

4 MILLBRAE RECREATION CENTER

RECREATION CENTER SITE PLAN

IN PROGRESS

1 1 MILLBRAE RECREATION CENTER

PROGRAM DIAGRAM – FIRST FLOOR

1 2 MILLBRAE RECREATION CENTER

Two Story – 26,000 Square Feet

PROGRAM DIAGRAM – SECOND FLOOR

13 MILLBRAE RECREATION CENTER

DESIGN OPTIONS EVALUATION ENTRY

14 MILLBRAE RECREATION CENTER

DESIGN OPTIONS EVALUATION

COMMUNITY HALL ENGAGING THE PARK

15 MILLBRAE RECREATION CENTER

Budget & Timeframe

16 MILLBRAE RECREATION CENTER

Project Budget ➢ Estimated cost: $30 million, includes:

• Hard and soft costs for construction, parking, and associated outdoor

spaces, furniture, signage, technology, project contingency and escalation

• Other funding or method sought for solar installation
• $12 million voter approval bond being sought from community
• Other funding: insurance money, developer fees and selling property

Project Timeframe ➢ Break ground potentially in 2019 ➢ Complete building as early as 2021 (with voter approval in November 2018)

To reduce operational costs and increase efficiencies, the City Council and community members have placed a strong emphasis on the need for this building to be both environmentally responsible and operationally efficient. Operational efficiency and flexibility are key criteria being used in the development of the design for the new Recreation Center with ease of surveillance, independent access, and multi-use spaces being incorporated into the building plans. Sustainable Design Strategies:

• Water use reduction for

building and site

• Heat island reduction

(micro climates that are warmer in developed areas from human activity)

• Optimizing energy

performance (high efficiency equipment)

• Renewable energy

production (photovoltaics)

• Daylight and daylight

harvesting

• Minimizing construction

and demolition waste

• Building life-cycle analysis

and application

• Renewable and recycled

building materials

• Indoor environmental air

quality

MILLBRAE RECREATION CENTER 11

Sustainable Design Elements

➢LEED: Project will track LEED checklist and present to the City Council to decide on certification ➢Solar: Plan is to install photovoltaic system to achieve zero net energy along with other measures ➢ BayREN - Zero Net Energy: Provided preliminary solar analysis and recommendations for roof slope and angels and assessed local wind patterns. BayREN provided a Zero Net Energy Assistance Report that answers:

• 1. The effect of massing on wind patterns and potential wind tunnel issues. A wind

study was conducted to evaluate passive ventilation to reduce need for mechanical systems and energy load

• 2. What impact the roof direction and tilt have on annual solar generation per

installed kilowatt

Sustainable Design Elements

MILLBRAE RECREATION CENTER 12

The windrose at left shows the speed and direction of wind at the site for a typical year based on weather data from San Francisco International Airport. Wind comes from the West, West-Northwest, or West-Southwest for approximately 60% of annual hours, with wind speeds that rarely crest above 13mph and are typically below 7mph. With the wind coming from such specific directions for a majority of the year, at nearly consistent low speeds, modeling has been performed for the following cases:

• Direction of 292°with a wind speed of 7mph
• Direction of 270°with a wind speed of 10mph

Computational Fluid Dynamics (CFD) software has been used to analyze and visualize the impact of the proposed structures on local wind patterns. IES Virtual Environment’s MicroFlo CFD simulation software was used throughout.

Typical wind direction = West / West-Northwest Typical wind speed = 0-6.7 mph

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Wind Direction and Speed - Millbrae

Solar Efficiency Analysis

Comparing Tilt, All South Facing Tilt kWh per kW per year Payback Annual cost savings 30 degrees 1,616 8.7 years $404 20 degrees 1,585 8.8 years $396 10 degrees 1,514 9.2 years $379 Flat 1,404 10.0 years $351 Comparing Direction and Tilt Direction kWh per kW per year Payback Annual cost savings 20 degree tilt SE-facing 1,505 9.3 years $376 20 degree tilt S-facing 1,585 8.8 years $396 20 degree tilt SW-facing 1,547 9.0 years $387 Flat 1,404 10.0 years $351 20 degree tilt N-facing 1,108 12.6 years $277 20 degree tilt NE-facing 1,174 11.9 years $294 20 degree tilt NW-facing 1,213 11.5 years $303 4 degree tilt N-facing 1,355 10.3 years $339 4 degree tilt NE-facing 1,365 10.3 years $341 4 degree tilt NW-facing 1,374 10.2 years $344

Annual Solar Generation by Tilt in Millbrae (kWh/kW/yr) Annual Solar Generation by Direction in Millbrae (kWh/kW/yr)

Roof design can have a significant impact on rooftop solar performance. When a building owner is purchasing enough solar panels to offset all local energy use, this impact can result in significant increased solar costs. Considering these impacts early in the design can save hundreds of thousands in capital costs for on-site

• renewables. This page summarizes the effectiveness of rooftop solar based on roof design at the site.

Methodology: PV Watts, a software created by the National Renewable Energy Lab (NREL) with Department of Energy (DOE) funding has been used to assess the performance of solar photovoltaic panels at differing tilts and

• directions. Weather data from San Francisco International Airport has been used for the assessment.

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30 degrees 20 degrees 10 degrees Flat 1,374 1,585 1,547 1,404 1,108 1,174 1,213 1,616 1,585 1,514 1,404 1,505 1,355 1,365 20 degree tilt NE-facing 20 degree tilt NW-facing 4 degree tilt N-facing 4 degree tilt NE-facing 4 degree tilt NW-facing 20 degree tilt SE-facing 20 degree tilt S-facing 20 degree tilt SW-facing Flat 20 degree tilt N-facing

Sustainable Design Elements

➢PG&E Savings by Design Program:

• Incentive program that pays owners to design and build a new space that exceeds

Title 24 by 10% or more

• New construction includes: new buildings (Whole Building Approach), and gut rehabs

and tenant improvement projects (Systems Approach)

• Considerations:
• Not all higher efficiency design elements are covered by Savings by Design and
• wners have had to fund the difference
• Harder to achieve 10% with CALGreen being more stringent

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October 2018

Zero Net Energy CommunityPool

City of Brisbane

Brisbane Community Pool -

• utdoor pool open year round

Existing Solar Thermal Panels - supplement gas boiler which is scheduled for replacement

Pool heatingoptions

Option 1: Carrier Natural Gas Boilers Adult pool efficiency: 97% Kids pool efficiency:82% Option 2: AquaCal HeatPumps Efficiency: 5.35 COP Option 3: Electric Boiler Efficiency:100%

$322,102 $1,865,825 $393,454 $0 $500,000 $1,000,000 $1,500,000 $2,000,000 $2,500,000 $3,000,000 Baseline- Existing Carrier Nat Gas AquaCal Heat Electric Boiler Boilers Pump

Capital Costs includingSolar PV for ZNE

Capital Cost Savings for ZNE PV CapitalCost InstallationCosts Carrier RestockingFee HVAC CapitalCost

Capital costs per pool heatingoption

Between the equipment capital cost, the Carrier restocking fee, and the assumed installation costs, the AquaCal heat pump option carries the highest upfront cost. However , due to the high efficiency , it greatly reduces the amount of PV required for the pool to be zero net energy . Therefore, the heat pump option (including the cost of PV) has in fact the lowest overall capitalcost.

$119,602 $180,602 $133,602 $0 $40,000 $80,000 $120,000 $160,000 $200,000 Carrier NatGas Boilers AquaCal HeatPump Electric Boiler

CapitalCosts

InstallationCosts Carrier RestockingFee HVAC Capital Cost

Energy costs and paybackcalculations

$0 Electric Boiler AquaCal HeatPump Carrier Nat GasBoilers Baseline -Existing

Energy Costs($)

$20,000 $40,000 $60,000 $80,000 $100,000 $120,000 $140,000 $160,000 Electric Costs Natural Gas Costs 200,000 400,000 600,000 800,000 1,000,000 1,200,000 Baseline -Existing Carrier Nat GasBoilers AquaCal HeatPump ElectricBoiler

Energy Use(kWh)

Electric (kWh) Natural Gas(kWh)

Total Energy Cost Savings Total HVAC CapitalCost Simple Paybac k (years) PV ofZNE Cost Savings Simple Payback w/PV(years) CarrierNat GasBoilers $10,661

$119,602

11 $441,704 instant AquaCal HeatPump $29,701

$180,602

6 $2,046,427 instant Electric Boiler

• $92,636

$133,602

n/a $527,056 n/a

Although the electric boiler saves energy , it generates a negative utility cost savings since it does not save enough to compensate for the increased utility rate switching from gas to electric. The natural gas boiler and the heat pump options have paybacks of 11 and 6 years respectively (without PV). However , including the savings associated with reducing the amount of required PV for ZNE pays for the new equipmentinstantly .

PV requirement for zero netenergy

Natural GasBoilers 558 kW $2.0million 43,000 sf ElectricBoilers 534 kW $1.9million 41,000 sf HeatPumps 100 kW $350,000 7,700 sf Note: The location is for reference to scale only , we would never recommend putting solar panels over a baseball field.

Solar Thermal

$32,690 $4,948 $37,638 Current GasBills Current Solar Thermal Gas Costs withremoval Savings

• f solarthermal

Currently the solar thermal system offsets almost $5,000 in natural gas bills. If the system were to be decommissioned and offset with PV , it would require an additional 90 kW which would cost approximately $315,000 and take up 7,000 sf.

Gas boiler to potentially back up heat pumps in colder weather (Dec. and Jan.)

Heat Pump specifications provided

Proposed location for 3 Aqua Cal Heat Pumps