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Solar Decathlon University of Colorado wins using TRNSYS Acknowledgements This presentation is based on the following information: Solar Decathlon Website University of Colorado – Boulder website Detailed Simulation report, kindly communicated by Mike Wassmer Presentation Overview

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solar decathlon

Solar Decathlon

University of Colorado wins using TRNSYS

acknowledgements
Acknowledgements
  • This presentation is based on the following information:
    • Solar Decathlon Website
    • University of Colorado – Boulder website
    • Detailed Simulation report,

kindly communicated by Mike Wassmer

presentation overview
Presentation Overview
  • The Solar Decathlon
  • University of Colorado project
    • BASE+
    • Reduced environmental impact
    • Systems
  • TRNSYS Simulations
    • Simulation approach
    • Energy performance
  • Other simulation tools
what is the solar decathlon
What Is The Solar Decathlon?
  • Competition to design, build and operate the most effective and efficient solar-powered house
    • The 3 phases are evaluated!
    • Self-sufficient (PV system + batteries)
  • Open to Students from US universities
    • Some funding from DOE but mostly sponsors
  • Houses are operated on the National Mall in Washington, D.C.
    • First assembled in each university
    • Must be easy to move
    • No basement
the 10 contests
Design and Livability

Innovation & aesthetics

Presentation & Simulation report

Graphics & Communication

Web site, newsletters, live tours

The Comfort Zone

Consumer appeal of HVAC system

Performance of HVAC system (T, RH, Energy)

Refrigeration

Hot Water

Shower/Laundry/Dishes

Cons. appeal/Performance

Energy Balance

In/Out Batteries

Lighting

Innovation, Integration

Performance

Home Business

Office space / equipment

Getting Around

Extra energy for transportation (elec. car)

The 10 contests
the base design
The BASE+ Design
  • Adaptability through a modular approach
    • Basic Module
      • constructed from systematized wall, floor, and ceiling components called Structural Insulated Panels (SIP)
      • Solar Decathlon: 2 Basic modules (bed/bath and office/living areas)
    • Spec Module
      • Architectural customization
      • Solar Decathlon: Kitchen/Entry, high glazing fraction
    • Tech Pod
      • Utility module, metal frame
the base design7
The BASE+ Design
  • What does it look like?
building
Building
  • More an every-day American home than a perfectly designed experimental solar house
    • Roof is not at the perfect angle for solar cells17.5° and 25°
    • Not the 70’s “conventional” passive design
  • Environment-friendly building
    • Materials
      • Low embodied energy, sustainably harvested, recycled, recyclable, non-toxic, local suppliers
      • E.g. fast-growing aspen wood, sheep wool, recycled plastic
    • Construction
      • Recycling, reducing waste
glazing
Glazing
  • SouthWall Superglass Quad-TC
    • Double glazing + 2 suspended films
    • Krypton-filled
    • “weightless cavity construction”Same weight as double-pane window
    • U-Value = 0.57 W/m²/K
    • Visible transmittance: 52%
    • SHGC (Solar Heat Gain Coefficient): 41%
  • Glazing area
    • 21 m², 50% in South façade
solar thermal system dhw only
Solar Thermal System (DHW only)
  • Thermal collectors
    • Evacuated Tubes placed on a flat surface (TechPod roof). Absorber is tilted
    • 4.4 m², 300 l storage tank
    • Electrical auxiliary heater 6kW
pv system
PV System
  • AstroPower mono-crystalline Si
  • 60 m², 7.2 kWc
  • Electrical System (48V DC)
    • Maximum Power Point Tracker
    • Lead-Acid batteries
      • 4 parallel strings of 8 batteries
      • 67.2 kWh total storage capacity
  • Estimated cost: $400 / month
    • 30 years mortgage, 7% interest
hvac system
HVAC System
  • All-electric
    • Heat-pump
      • 7kWth
      • 5kW resistance for peak heating
    • Ventilation system
      • Energy Recovery
        • Temperature
        • Humidity
trnsys simulation study
TRNSYS Simulation study
  • 3 independent simulations
    • Solar Thermal system
      • Usual SDHW system simulation
      • Average Draw = 135 l/day
    • PV System
      • Batteries were removed (perfect storage)
    • Space conditioning + Building
      • Type 56 for building (1 zone)
      • Different hypotheses on gains (home - home office)
solar thermal system simulation
Solar Thermal System Simulation
  • Parametric studies
    • Collector area
    • Location (CO, DC)
    • Storage tank location
    • Collector slope
pv system simulation
PV System Simulation
  • Parametric studies
    • Location (CO, DC)
    • PV Array Azimuth
    • PV Array slope
building model
Building model
  • Type 56 with some simplifications
      • Tech Pod not modeled
      • Windows approximated by existing model in US library
      • Very low infiltration (0.05 ACH)
      • Simplified shading simulation (lumped windows)
      • Internal gains: default values for Solar decathlon
    • Setpoints:
      • Heating 20.6°C
      • Auxiliary electrical resistances 21.4°C
      • Cooling 24.7°C
  • ERV
    • Constant effectiveness
    • Schedule: always ON for home office
other simulations
Other simulations
  • Early parametric studies
    • Energy-10
      • SIP thickness
      • Glazing options
  • Electric lighting design
    • AGI32
  • Solar Shading strategy
    • Ecotect 5
  • Daylighting
    • Radiance
more information
More information
  • Solar Decathlon website:

http://www.eere.energy.gov/solar_decathlon/

  • University of Colorado – Boulder Solar Decathlon Team website

http://solar.colorado.edu/