Utility Master Planning for the 21 st Century Martha M. Larson, CEM - - PowerPoint PPT Presentation

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Utility Master Planning for the 21 st Century Martha M. Larson, CEM - - PowerPoint PPT Presentation

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Advancing Climate Adaptation in Minnesotas Colleges and Universities Utility Master Planning for the 21 st Century Martha M. Larson, CEM Manager of Campus Energy & Sustainability January 31, 2017 Carleton College, Northfield, MN Campus

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January 31, 2017

Advancing Climate Adaptation in Minnesota’s Colleges and Universities

Utility Master Planning for the 21st Century

Martha M. Larson, CEM Manager of Campus Energy & Sustainability

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Campus Statistics:

  • Private undergraduate liberal arts college
  • Founded in 1866
  • Approx. 2000 students
  • 2,000,000 SF, 40+ buildings
  • 1,000 acres (800 Arboretum)

Carleton College, Northfield, MN

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Environmental Statistics:

  • Campus EUI 100-120 kBTU/SF/yr
  • Greenhouse gas emissions ~ 22,000 MTCDE/yr
  • 1.68 MW wind turbine connected to the campus grid
  • 1.65 MW wind turbine connected to the public grid
  • 9.8 kW rooftop solar PV plus small solar thermal
  • Climate Action Plan targets carbon neutrality by 2050

Carleton College, Northfield, MN

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Planning Context

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Climate Action Plan 2011 Strategic Plan 2012 Facilities Master Plan 2014

Utility Master Plan 2017

Planning progression:

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Support the Facilities Master Plan

Utility Master Plan Objectives:

Advance the Climate Action Plan Address Aging Plant Equipment

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2017 Utility Master Plan

Planning for the next 100 years

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2014 Facilities Master Plan

With a focus on replacement and renovation, the 2014 Facilities Master Plan anticipates

  • nly 3% net growth in total campus square

footage over the next 20-30 years.

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ACTUAL EMISSIONS

2011 Climate Action Plan

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2011 Climate Action Plan

Scope 3 = indirect emissions

(air travel, waste, fertilizers, etc.)

Scope 2 = purchased electricity Scope 1 = fuel burned on site

Kracum Turbine

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2011 Climate Action Plan

2011 Climate Action Plan: Options Evaluated

What’s the next big idea?

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Planning Process

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Facilities & Finance

Utility Master Plan Project Team

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Assessment of Existing Conditions

ASSETS LIABILITIES

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Integration with Other Campus Plans

NEW SCIENCE ADDITION

  • Located at center
  • f campus
  • Highest energy

use intensity buildings

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Geothermal heating (to heat pump) High efficiency boiler load Simultaneous load (heat pump)

Geothermal cooling (to heat pump)

Energy Profile: Existing Steam System

MBTU/Hr Month

Steam Boilers Electric Chillers

Carleton College – 2015 Heating & Cooling Load Profiles

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BOILER EFFICIENCY

Concept #1: 120 Degree Hot Water

NON-CONDENSING CONDENSING

HOT WATER RETURN

Lower water temperature increases boiler efficiency and allows use of technologies like solar thermal, heat pumps and geothermal well fields.

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Concept #2: Geothermal Heat Pumps

Connects the heating and cooling cycles so they can balance each other

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Concept #3: Combined Heat & Power (CHP)

Natural Gas Electricity Heat

Creates two outputs (electricity + heat) from a single input (natural gas) Offsets the increase in electricity required to power the geothermal heat pump system.

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Concept Phase Evaluation

Base Case Keep steam plant Alternative Transition to a hot water plant vs. Option C

Geothermal sized to meet summer cooling load

Option B

100% Geothermal sized to meet winter heating load

Option D

Geothermal sized to meet simultaneous heat/cool load

Base Case w/ CHP Option C w/ CHP Option D w/ CHP

CHP = Combined Heat and Power

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Geothermal heating (to heat pump) High efficiency boiler load Simultaneous load (heat pump)

Geothermal cooling (to heat pump)

Energy Profile: Existing Steam System

MBTU/Hr Month

Steam Boilers Electric Chillers

Carleton College – 2015 Heating & Cooling Load Profiles

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Energy Profile: Hot Water Transition

Geothermal heating (tied to heat pump) High efficiency hot water boilers Simultaneous load (heat pump only)

Geothermal cooling (tied to heat pump)

Electric chillers Heat from CHP

Carleton College – 2017 Heating & Cooling Load Profiles

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Potential geothermal well field locations

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Geothermal testing on the Bald Spot (Summer 2016)

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Planning Outcomes

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Conceptual System Overview

GEOTHERMAL WELL FIELDS

COMBINED HEAT & POWER NEW ENERGY STATION WIND SOLAR Facilities Building

BALD SPOT MINI BALD SPOT BELL FIELD

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Cost and Carbon Comparisons

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Cost and Carbon Comparisons

  • CHP?
  • Solar PV?
  • Wind Turbine?
  • Greener Grid?

Electrification is key….with gas to back up & supplement.

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$0 $20,000,000 $40,000,000 $60,000,000 $80,000,000 $100,000,000 $120,000,000 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046

Calendar Year

Cumulative Project Cost Capital + Operating

Base Case: Steam Recommendation: Hot Water

Payback period ~ 17 Years $40M savings

  • ver 30 years

Financial Comparison

Cumulative Capital + Operating Costs

Break Even Point

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2016 Utility Master Plan

A more efficient system that is future-focused

  • n renewable energy technologies and reduces
  • ur carbon footprint,

by transitioning from steam to a “low temp” hot water heating distribution system, using a mix of geothermal wells, heat pumps and combined heat and power supplemented by gas-fired, high efficiency condensing boilers.

Why How What

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Climate Action Plan

Questions?