Full View of Energy Supply and Demand

Narrative (note that the following

slide contains embedded links)

3000 ft2

PV sizeand type

John Scofield paperon monitoring a solar academic building

Energy Supply and Demand Narrative

John Scofield paperon performance forJasper Ridge

Heat Recovery From Gray Water Narrative

Monthly Water FlowMonthly Heat Flow

Waterflow diagram

Water tank capacity Shower Drain

Temperature

Daily water volumeper tank

Well capacity

Seasonal ground water temperature

Capacityfactor

Fuel Cell Narrative

Energy from fuel cell

Fuel cell size

Solar Hot Water Narrative

Area of solar water array

EfficiencyInsolation

Photovoltaic Array Narrative

64,431 kWh/yr

Jasper RidgePV PerformanceSince 10/2002

Elect: 404 MMBtuHeat: 296 MMBtu

NatGas: -389 MMBtu

Energy from Solar Hot Water

Number tanks = 1Size = 2,000 gal

NEED gal/min

35 MMBtu/yr

Pump 1: NEED FPump 2 NEED F

NEED gal/min

680 gal/day

Cf = 90%

5KW CHP

Energy Balance

0 = Supply – Demand[BTU/yr]

92 MMBtu/yr

5kWh/m2d40%

475 ft2

Building Geometry

Energy Supply Narrative

~100ºF

(1000 ft2)

Back of EnvelopeArray Size

Energy from Photovoltaic Array

~1.4 [m3/day]

Bioreactor

Site

Building layout

Equest energy analysis

Building geometry

Equest simulationassumptions

Comparison for consistency

Back of theenvelope energyconsumption

Energy Demand Narrative

Total: 54,423 kWh/yr199 MMBtu/yr

Building Energy Demand

Heat Pump

Energy Conversion

Energy from building graywater

ElectricitySupply

54,423 kWh/yr

HeatSupply

120 MMBtu/yr(85+35)

Natural GasFrom Utility

79 MMBtu/yr(80.1 MMBtu) source

35 MMBtu/yr- 2,188 kWh/yr

HeatNot used

7 MMBtu/yr

BioGas production

ExcessElectricityback to grid

7820 kWh/yr(80.1 MMBtu)source

eQuestNatural GasDemand

79 MMBtu/yr

eQuestElectricityDemand

54,423 kWh/yreQuestHeatDemand

120 MMBtu/yr

Utility Balance

Caption for Energy Narrative• The Energy Supply and Demand Narrative is a snapshot of the status of the

design of the energy systems for the Stanford Green Dorm by the end of the Feasibility Study (mid February, 2006). It reflects the alternatives discussed, analyzed and discarded to achieve a Zero Energy Goal, one of the product functional requirements requested by the owner.

• The Energy Narrative has three types of sub-narratives: the Energy Supply Narrative (blue); the Energy Demand Narrative (red) and the Utility Balance Narrative (purple). The first is divided into other sub-narratives which are the different sources of energy explored during the design to provide on-site energy generation. The second is the narrative describing the model-base demand of the building calculated using eQuest with a set of assumptions about the use, size, shape and material properties of this living lab. The third is a simple narrative that shows the energy exchange with the utilities (electricity and natural gas).

• The Energy Supply Narrative is subdivided into six narratives. Each of them details the sources of onsite energy generation explored during the feasibility study to match the energy demand. The two grayed-out narratives (fuel cell and bioreactor) denote two alternatives explored, but not included in the energy balance to achieve the zero energy goal. Their dependencies with the overall energy balance are shown with dashed lines to point out what their potential impact could be.

• The perspectives labeled “NEED” denote information that is missing. It usually correspond to discussions held within the design team, but that didn’t translate into formalized design alternatives.