The University of Texas Bloom House places 2nd in E i i D i t th 2007 S l D thl !!Engineering Design at the 2007 Solar Decathlon !!
What is the Solar Decathlon?
• The Solar Decathlon is an international competition sponsored every two years by the U.S. Department of Energy
20 Universities compete to design build and operate the• 20 Universities compete to design, build and operate the world’s most attractive, energy-efficient solar-powered house
ENGINEERING: Energy Modeling
Design of Building Envelope:•Collaboration between Architect re and EngineeringArchitecture and Engineering Students
•Design iterations to optimize
Architectural models Energy-simulation models
shape and energy use
Solutions:•passive shadings
•positions and area of windows
insulation value•insulation value
•tightly sealed envelope
•high-performance windowg p
•position of solar collectorsDesign iterations
ENGINEERING: Energy Modeling
•Energy-efficient use of natural cooling
•Computer modeling for analysis of nat ral entilation
Air Volume flow rate
natural ventilation
1618
ACH [h-1]Air Volume flow rate (cooling potential)
Surface roughness68
101214
0246
Case 1 - sm all ve locity, Case 2 - lage ve locity,
40.1”large openings sm all openings
ENGINEERING: Mechanical Systems
UT t t f titi i i tUT strategy for a competitive engineering entry•well-balanced solutions
t d i d f id ti l•systems designed for residential owner-users•robust, simple, off-the-shelf components, innovative control
ENGINEERING: Solar Energy System
• photovoltaics integrated into house
tgeometry
• $70,000 award from Annual Solar Insolation vs. Tilt Angle
651700
AustinWashington
BP Solar
• 7 6-kW array to power
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617 622 612
588 550
500476 498
509 508
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600
lar
Inso
latio
ns
tu/h
r*ft2 )
WashingtonMonthly Opt.
7.6 kW array to power house and electric car
• solar angle optimized 470434 440
374
442476 495
390
338300
400
Annu
al S
o(k
Bt• solar angle optimized for Austin and Washington, DC
3000 10 20 30 40 50 60 70 80 90
Tilt Angle of Surface Facing South
ENGINEERING:Hot-WaterSystem
•powered by hot-water solar collectors
- evacuated-tube technology
id f•provides energy for:
- domestic hot water
-hot-water floor heatinghot water floor heating
•innovative control system
ENGINEERING: Heating, Ventilating, Air Conditioning
•air conditioning by ductless mini-split system heat pump
minimal losses from- minimal losses from leakage and ducts
- precise temperature control in both zones of the house
- operation coordinated with hot-water floor heating
•fresh air and air-quality control by heat-recovery ventilation system
ENGINEERING: Structural Design
•Challenges•transportation loading•high live load•low soil capacity in DC•no interior shear walls•deployable structure
•Design•steel mobile-home chassis
•short assembly time
•steel moment-frame structure to resist lateral loads•structural insulated panel (SIP) walls •collapsible solar-panel rack system•deployable foundation
• created by students
ENGINEERING: Structural Designcreated by students
• designed by students• computer-modeled by students• financed through studentsg• scheduled by students• constructed by students• presented by students