Tsinghua Green Building Research Center
A Low Energy Demo Building

Yingxin ZHU Department of Building Science School of Architecture Tsinghua University Beijing, China
Pressure distribution around the building
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Shape stabilized phase change material used in rising floor
floor
PCM
Tfloor
Tin without PCM
Tin with PCM Temp Tout Qsolar
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BACKGROUND: Green Olympic Building Assessment System (GOBAS)

Sponsored by Ministry of Science & Technology (MST) for Olympic 2008
Tsinghua Univ. and other 8 institutes were involved Collaborated with CASBEE (Japan) and LEED(USA) A prototype of Chinese Green Building assessment system Followed-up by another project sponsored by MST Research on the pivotal technologies of green building Assessment system for Green
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Outdoor air handling Unit (dehumidifier)
30.7 º C 26.7 g/kg 28.3 º C 21.5 g/kg 26.8 º C 16.9 g/kg 26.0 º C 11.5 g/kg Exhaust air
Plate HX
35.0 º C 20.0 g/kg Outdoor air
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Daylight utilization system
Basement
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Natural ventilation
▼ Utilize natural ventilation based the around situation
Stack ventilation
▲ Zonal ventilation design
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HVAC System: Office
1 Cool ceiling: no dehumidification, 18C water 2 Task air-condition: natural wind emulator 3 Floor displacement ventilation: dried fresh air
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Thank you for your attention!
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facade
PCM heat storage floor
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Energy performance of fabrics
DeST
Average Heating load in Jan. 2.3W/m2
Cooling load: Average 5.2W/m2, Max. 12.8W/m2
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Adjustable External Shading
33.3 º C 14.7 g/kg
30.9 º C 10.7 g/kg
28.6 º C 7.9 g/kg Heat EX
22.2 º C 7.9 g/kg Supplied air
Diluted solution, 46.6% Concentrated solution, 51.4%
Chilled water 18.0 º C
PV panel
Summer status
Size of louvers : Length Width Distance between louvers
Winter status
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East DSF
U=1.0 SHGC<0.1
W/m2K
South DSF
U=1.28 W/m2K SHGC<0.1
PV panel
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Energy System

BCHP

50 kW fuel cell Gas Engine Micro gas turbine

15C underground water
utilization

WS HP

Used through heat EX

Solar heat collector (Water and air heater)
View & shading
PV panel
PV panel
3.0 m 0.6 m 0.6 m
The horizontal louvers can be controlled independently to meet the different purposes, which including daylight, view and solar energy collection, along vertical direction.
Building of Beijing Olympic, published in Aug. 2003




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Tsinghua Green Building research center A workbench for

Low Energy Demo (LED) Building
School of Architecture
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Brine regenerator
Hot water 80.0 º C Warm water 55.7 º C
Waste heat from BCHP
Plate HX
Outdoor air Heat Recovery Exhaust air Heat EX
Diluted Solution
Concentrated solution
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Chaos & Fractal Phenomenon Analysis ——Phase space reconstruction
y
=B/L
L
re a rra g e m e nt 2 -D 1 .4
1 .2
B
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Buoyancy air flow
x
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a (i+ r)
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Mechanical wind

GOBAS Research on the pivotal technologies of green building

Location: Tsinghua Campus Floor area: 2920 m2 4-story overground, 1-story basement Office building 3
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0 .4 a (i)
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Natural wind
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Subject experiment
Satisfaction Vote
Vote to different air flows
Steady
Sinusoid
Simulated Stochastic natural wind
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New Air handling method

Independent humidity control

New brine system with high efficiency Solar heat will be the driving power