The Development of Green Building in China from the Point ... Building... · The selection of green building technologies take “practical， reasonable， economic， innovation”

The Development of Green

Building in China

— from the Point of View of GBL

Evaluation

Dr. Li Congxiao

Director of Green Building Research Center,

Chinese Society for Urban Studies

07.2012

Contents

Main Problems in Chinese Green Building Evaluation

Green Building Policy Guidance in China

Updates of Green Building Evaluation Standards in China

An Introduction of Chinese Green Building Label (GBL)

Overview of Chinese Green Building Label Evaluation

Caxe Case of Chinese Green Building

Existing Standards in the world

Chinese Green Building Label & Evaluation

GBL Evaluation Flowchart

1 An Introduction of Chinese Green Building Label (GBL)

Existing green building evaluation systems in the world

1 The US：LEED

2 The UK：BREEAM

3 Japan：CASBEE

4 Hong Kong：HKBEAM

6 Singapore：BCA Green Mark

5 Malaysia：GBI Malaysia

7 Germany：DGNB (German system of Sustainable Building Certificate)

8 Australia：Green Star Certification

9 France：HQE

10 Canada：LEED Canada / Green Globes



http://www.cagbc.org/

11 The Netherlands：BREEAM Netherlands

12 India：Indian Green Building Council (IGBC)

13 Italy：Protocollo Itaca / Green Building Counsil Italia

14 New Zealand：Green Star NZ 15 South Africa ：Green Star SA

16 Switzerland：Minergie 17 The UAE ：Estidama

18 Mexico：LEED Mexico 19 Brazil：LEED Brasil

20 The Philippines ：BERDE / Philippine Green Building Council



http://www.gbcitalia.org/

http://www.nzgbc.org.nz/

http://www.minergie.ch/home_en.html

http://www.estidama.org/


Chinese Green Building Label (GBL)

Green building refers to a structure and using process that

economizes resources (efficiently using energy, land, water, and

materials), protects environment and reduces pollution to the utmost

throughout a building’s life-cycle; provides healthy, applicable and

productivity-improving space; and harmoniously coexists with

nature.

—Evaluation Standard for

Green Building GB/T50378-2006

Meet the need of

utilization, create a

healthy and efficient

space, reflect the

humanistic nature of the

building

Emphasizes on

reducing

environmental

pollution and carbon

dioxide emission

The wide “4-Saving”

which mainly

emphasis on reducing

the waste of all kinds

of resource

Saving Environmental

Protection Health

The basic meaning of the green building

Why do we set Design Label?

1. Green Building Label requires a relatively long phase;

2. Real estate developers’ passion may reduce after 1 year of operation, as

buildings being sold;

3. The effect of government to promote green building can not appear in time.

Range of Evaluation

New construction, expansion and alteration of residential buildings

and public buildings (as well as ultrahigh-rise public buildings),

including office, shop, hotel buildings and industrial buildings.

A sample of Green

Building Label



Label Stage

Plan & design stage and operation stage (1-year after completion):

This two-stage Label setting is the characteristic of Chinese green building

evaluation.

A sample of Green

Building Design Label Green Building Design Label Green Building Label

Application Time

the stage after the construction drawings passed the plan approval

1 year after the operation based on the premise of completion and acceptance

A Sample of Three-star Green

Building Design Label

A Sample of Three-star Green Building

Label



Evaluation Levels

3 levels

★

★ ★

★ ★ ★ (the highest)

Evaluation institutions authorized by Chinese government:

Chinese Society for Urban Studies (evaluation proportion 50.1% );

MOHURD Science & Technology Promotion Center (19.3%);

Local agencies: there are 29 provinces which established the Office of label management

and committees of experts for green building evaluation (each region sets an evaluation

body which only reviewed one-star, two-star green buildings, the evaluation proportion

is 25.1%) to develop the evaluation work for local green building labels.

The evaluation is launched by above institutions, who organize evaluation experts of

every profession.

Evaluated by:

National standard GB/T50378, Evaluation Standard for Green Building. This

regulation is published in 2006 by MOHURD, the scope only includes public and

residential buildings.

Based on it there are Technique Rules for Evaluation of Green Skyscrapers(2012);

Evaluation Guideline for Green Industrial Building (MOHURD)


Chinese Green Building Label (GBL) Evaluation

Evaluation Framework

Framework of evaluation by sub-items is employed in Evaluation Standard for Green

Building. The result of evaluation for qualitative covenants is shown with “Accepted”

or “Non-accepted”; for the covenant with multiple requirements, it shall be accepted

only when each item of requirements is satisfied. （A grading system will be used in

the revision version.）


Stars

General Items (40 in total) Optional

Items

(6 in total)

Land

saving and

the outdoor

environment

(9)

Energy-

saving and

energy

utilization

(5)

Water saving

and utilization

of water

resources

(7)

Materials saving

and material

resource

utilization

(6)

Indoor

environment

(5)

Operations

Management

(8)

★ 4 2 3 3 2 5 --

★★ 6 3 4 4 3 6 2

★★★ 7 4 6 5 4 7 4

Chinese Green Building Label (GBL) Evaluation

Requirement on number of options which divide green buildings to different levels (for Residential Building)


Content of Chinese GBL Evaluation

1 Land saving and outdoor environments

Encourage to adopt nontraditional

water source, rainwater or resurgent

water;

Advocate water utilization in

efficiency and water saving

measures, water saving instruments,

and water for recreational

environment use in efficiency;

Encourage to conduct technical

economy analysis before

implementation;

Advocate to adopt the structural system

with little impact on environment and

resources;

Advocate to use recyclable material and

reusable material;

Advocate integration of construction with

decoration;

Limit the transportation radius of building

materials (70% materials in weight shall be

within 500km);

3 Water saving and water resources

utilization

4 Materials saving and the material

and resources utilization

Land safety (industrialization process),

environmental protection, and pollution

avoidance;

Land hygiene, without electromagnetism,

radon or toxic substances;

Build comfortable outdoor environment,

indigenous plant, afforest (rate);

Land consolidation utilization, indicator

of land per capita (urbanization process),

utilization of underground space;

5 Indoor environmental quality 6 Operations management

Sound insulation requirements;

Indoor pollutant control;

View;

Emphasize on personal regulation of

indoor comfort degree;

Encourage to employ functional

materials of new type;

Emphasize on the role of

management, important embodiment

of energy saving by actions;

The chemicals which can adversely

influence the environment such as

insecticide, herbicide, chemical

fertilizer and so on are not

recommended;

Pay attention to the classification,

collection and treatment of trash

Give consideration to space enclosing

structure and energy conservation of

equipment system;

Presentation of energy conservation

in passive way, sunlight, ventilation,

lighting and sun-shading;

Encourage to use renewable energy

sources (Ground Source Heat Pump,

photo-thermal and photo-electricity of

solar energy);

Heat recovery;

Encourage to utilize residual heat;

2 Energy saving and energy utilization

Application Submission & Registration Fee Payment

Formal Review

（Spot Inspection）

Evaluation by the Expert Committee

Guidance from Department of Building Energy Efficiency and

S&T, MOHURD

Result Feedback with Evaluation Comments

Result Feedback

CSUS-GBRC Judgment Publicity of Results,

Putting on File

Announcement & Label Certification

Fail

With Insolvable Objections

No

Ye

s P

ass

Without Objection


Evaluation Flowchart

Evaluation Steps：

Application Submission,

Formal / Technique Review,

Experts Committee Evaluation,

Publicity & Announcement,

and Label Certification, etc.

application material revision

application material complement

The statistics of evaluation number

Geographical distribution

Type distribution

General technique

Implementation effect

Number of GBDL and GBL buildings

By May of 2012, there had been 471 green building label projects and 3,532 buildings, whose

total area reaches 46.53 million ㎡.

Where you can see that gradually speed up the development of China green buildings speed,

2011 is the fastest of the years, new green building area is 346% of 2010.

Evaluation by Chinese Society for Urban Studies this year, is up 74% from last year.

In 2011, the number of GBL projects had been larger than LEED projects in China.

2 Overview of Chinese Green Building Label Evaluation

A General Status of Chinese Green Building Label Evaluation

• Some Local projects haven’t

registered in MOHURDD in 2012

At present, the national green building development is uneven, GBL projects mainly

distribute in eastern coastal developed provinces and cities.

Sorted by number, top ten respectively, Guangdong, Shanghai, Jiangsu, Zhejiang,

Tianjin, Beijing, Hebei, Shandong, Sichuan, and Hubei province.

Statistic of GBL & GBDL numbers in every province / cities


Geographical Distribution


Type Distribution

Counted by project number Counted by building area

Counted by project number Counted by building area

According to the climate divisions, China has five climate types, respectively as

tropical monsoon climate, subtropical monsoon climate, monsoon climate of medium

latitudes, temperate continental climate, plateau (mountain) climate and thus there are

five types of building thermal divisions. As the geography and weather are in great

difference from north to south and from east to west, green building construction

technologies in different places are with different emphasis.


General Techniques in China


Climate Distribution

Climate Distribution of GBL & GBDL

The selection of green building technologies take “practical， reasonable，

economic， innovation” as basic principle and fully considers the comprehensive

effects of the 6 perspectives：


General Techniques in China GBL Building

WA

TE

R O

PE

RA

TIO

NS

MA

NA

GE

ME

NT

Scientific and rational site selection, control

the site contamination, optimize the outdoor

environment

Reduce the energy consumption of building,

improve the efficiency of energy utilization,

and promote the utilization of renewable energy

Use the non-traditional water sources, gather

rainwater, and use the water saving appliances

Use high-performance materials, optimize the

structure design, the integrated design of the

construction and decoration Control the sound, light, thermal environment

in door to create a comfortable and

healthy building space

Well-designed intelligent system, and perfect

property management

6 major systems


According to 138 GBL projects data, we

make a statistical analysis for the “green”

technology applied. It can be seen, some

techniques are adopted widely: The widely used techniques include:

rational development of underground space;

outdoor permeable ground;

multi-layer green;

subentry measures;

water saving appliances;

rainwater infiltration measures;

premixed concrete;

the integrated design and build for

construction & decoration;

intelligent design;

household metering and automatic

monitoring systems.

The less used techniques include:

structural system optimization, combined

heating cooling and power production

system, waste heat or waste heat utilization,

energy recovery, and old building use.

Note: Source of the chart data came from the construction

technology - Green Building Annual Report (2011)


Introduction of key technology --Energy-saving Measure

Skylights Lighting atrium Light-guide tube

Energy-saving

Measure

Thermal insulation retaining structure

Natural ventilation and natural lighting

Energy-saving devices and green lighting

Renewable energy applications

Recycling utilization of

Waster heat and exhaust heat

Insulating glass Heat recovery of air exhaust


Introduction of key technology –nontraditional water source

utilization The nontraditional water generally used in China’s

green building mainly include reclaimed water and

rain water.

The nontraditional water is mainly used for outdoor

landscape irrigation and roads watering, and parts

used for indoor toilet-flushing.

Basic process of the rainwater treatment in green building


Introduction of key technology - Comprehensive greening and pavement design

1. Improve the outlook of urban environment;

2, Mitigate the atmospheric dust and purify the air;

3. Protect the roof of building to extend the service life of

roofing materials;

4, Reduce the indoor temperature;

5. Weaken the noise of the city;

6. Increase air humidity, purify the water;

7. Improve land resource utilization.

Green roofs Native plants 1. Select native outdoor plant to ensure

survival,& reduce maintenance costs; 2. Arrange reasonable shrubs and grass

to form multi-layer greening to be full

of vitality, and beauty the landscaping

Permeable ground 1. Provide comfortable and healthy thermal environment of

the site;

2. Ease the urban heat island effect;

3. Conserving water and preserving water and soil.

The outdoor green and permeable design are easy

to achieve, are good solution to land-saving for

their low incremental cost and significant

improvement effect on the site environment.


Introduction of key technology –green construction and

materials-saving

The acceptance work, system debugging and green operating after

construction will be the key issues faced by the green building in China.

Stage 1

• Develop the construction organization and design program and make the budget statement before construction.

Stage 2

• Strictly operate accordance with the requirements of green construction during construction process.

Stage 3

• Organize and record the pictures and daily records after construction is completed.

• Collate the materials balance ticket, construction budget statement, the calculation sheet of the recyclable materials utilization ratio of the building projects.


Through the analysis of different star green building project, the effect is as follows:

Community greening rate reaches to 38%;

Average energy saving rate is 58%;

Water-saving rate is 15.2%;

Recyclable materials rate is 7.7%.

Through the development of green buildings, we not only achieve the overall goal of

building energy-saving (1 billion tons of coal equivalent) but also reduce industrial

energy consumption by material savings.

It is predicted there are 300 new green buildings in China each year, it will realize

the achievements of saving energy 25.5 billion kWh (equivalent to 876,000 tons of

coal) reducing emissions of CO2 2.298 million ton, saving water resources 90 million

ton, 330 million ton of recyclable materials during the 12th “Five-Year" period.

(Source: Speech by Dr. Qiu Baoxing, Vice Minister of housing department and President of CUSU at China green building Meeting)

implementation effect of green building


The incremental cost of green building

Note: data form China GBC

The data above is the incremental costs statistical data of the green building before 2012, presenting a downward

trend with the gradually mature green technology and the increasing green products.

Different technical routes might cause big difference among the increment cost of green buildings at the same

evaluation level, and the achievement of high level stars is not necessarily with high cost. For some green

buildings, non-economic and non-low carbon phenomenon comes into being due to excessive “greening” caused

by undue use of green construction technologies.

The increment costs of green buildings in different places are different due to the climate and other features. In

some places, the building energy efficiency is set up high, and thus the increment cost of green buildings is

relatively low. For example, the increment cost of three-star green buildings in Jiangsu Province is about RMB

60/m2 for residential buildings and 200/m2 for public buildings.

Public Buildings

Residential Buildings

Incremental

Costs(Yuan/M2)

Issued standards

Standards under development

Standards in plan

Issued standards:

National standard

Evaluation Standard for Green Building

Technical Rules for Green Skyscrapers;

Evaluation Standard for Green Construction of Buildings;

Evaluation Guidelines for Green Industrial Building;

China GBC standard

Evaluation Standard for Healthcare Green Building

Local standard

14 provinces have issued their own standards according to local conditions by now, and a series of

local regulations have been accordingly developed, such as Guild of Material and Equipment

Selection of Green Buildings in Tianjin Municipality, Guidelines for Low-Carbon Construction of

Hongqiao Business Park in Shanghai (Trial), Guide for Green Building Design of Chongqing

Municipality, Technical Regulations for Energy Efficiency Reformation of Existing Residential

Buildings in Zhejiang Province, Zhejiang Province: Technical Regulations for Evaluation of Energy

Efficiency of Civil Building Project, and Guangzhou Green Building Design Guides.

3 Updates of Green Building Evaluation Standards in China

Standards under development (expected to be issued in 2013):

National standard

Evaluation standard for the green industrial building ;

Evaluation Standard for Heahcare Green Building ;

Evaluation Standard for Green Office Building;

China GBC standard

Evaluation Standard for Green Stores Building;

Technique Standard for Green Building Testing;

Evaluation Standard for Green Campus;

Evaluation Standard for Green City

Standards in plan:

Evaluation Standard for Green Hotel Building, Evaluation Standard for Green Railway

Station, Evaluation Standard for Green City, Evaluation Standard for Green Small Town,

Evaluation Standard for Green Reconstruction of Existing Buildings

Green Building Standard for different climatic regions is also under development, thus a

full range of a standard system is expected to be established for the China green building in

2-3 years.

3 Updates of Green Building Evaluation Standards in China

Support from the government

The developing direction of green building

State Council

The State Council issued the Integrated Work Program of “12th five-year” Energy-

saving and Emission Reduction, which clearly states that to develop green building is

the key task of the energy-saving and emission reduction, including:

（1）To continue to improve the green building standard system, and encourage the

local governments to develop the stricter standard of green building;

（2）To enhance the implementation of green building assessment label;

（3）To carry out the relevant demonstrations of green building.

MOHURD and NDRC

Ministry of Housing and Urban-Rural Development (MOHURD ) and The National

Development and Reform Commission (NDRC) have developed the Green Building

Action Program, which put forward the concept, goal, basis principles of promoting

the green building development, and clearly defines the key tasks and guarantee

measures.

4 Green Building Policy Guidance in China

MOF and MOHURD

Ministry of Finance and MOHURD have jointly issued The Comments on the Implementation

for Promoting the Green Building Development in May, 2012, which draws up requirements

on green building increment and announces national allowance standard for green building

for the first time.

To improve the proportion of the green building in new building. In 2020 the green

building will account for more than 30% of the new building, and the energy and

resource consumption level during the construct and use process of the building will

close to or reach to the present level of that in the developed countries.

Public housing invested by government must fully implement green building standard,

and the newly increased green building area are expected to reach to above 1 billion m2

in 2015.

Reward the green building above 2-star level. The award standard in 2012 is:

45 Yuan/ m2 for 2-star level green building,

80 Yuan/ m2 for 3-star level green building (the award amount accounts for nearly 50% of the incremental

cost of the residential building).

To support the mass development of the green building. The green ecological city whose

new buildings fully reach to or above the standard of 1-star level could get 50 million

Yuan from central government.



The developing direction of green building

Green building complies with the natural developing trend of society. It can be

foreseen that green building will grow rapidly during the 12th and 13th “Five-year”.

2

1 ●Voluntary application

● Start-out

● Commonweal &

regional coerciveness

● Commercial

Voluntary

● Mess growth

●Commonweal &

coerciveness

●Commercial economic

incentive

●Universalized around

China

3

10th Five-year 11th Five-year 12th Five-year

100/Year

1000/Year

300~500/Year

Techniques

Cost

Features

Technological

innovations

More passive

energy-saving

technologies and

optimization

measures are

expected in the

building program to

avoiding pilling of active energy-saving

measures and

technical.

Integration

The green

building

technologies of

various

professions should

be harmony

enough,

otherwise will

lead to the

unmatched

relevant

technologies.

Cost control

More

consideration

should be paid in

pre-design phase,

which may result

the large increase

of construction

cost after passively

adopting the green

building

technologies.

Unpredictable

implementation

(operation)

effect

Local features

For the buildings

having obtained

GBDL, it is key

issue to guarantee

them to be

completed in

compliance with

the design

requirements.

Local features

should be

emphasized

further.

5 Main Problems in Chinese Green Building Evaluation

Problems revealed during green building evaluation

Residential Green Building Case

Public Green Building Case

A residential project in Suzhou, Jiangsu Province

The residential project locates in Suzhou

Industrial Park, which includes 15 dwelling

buildings and matched public facilities.

GBDL ★ ★ ★ (2009)

Green building evaluation result

evaluating indicator result

Building energy-saving

ratio 87.80%

Renewable Energy Use

ratio 100% household use ground

source heat pump

Use ratio of

nontraditional water

source

18.09%

Ratio of green area 53.50%

Renewable material ratio 10.39%

indoor air pollutant

consistency Match GB50325

property management Match ISO14001

6 Cases of Chinese GBL Projects

Thermal insulation retaining structure

High energy efficiency building implements

Solar photovoltaic generation system

solar water heating coupling GSHP

Utilization of Nontraditional Water Source

Other techniques


“Green” Technology Strategy


“Green” Technology adopted -- Insulation retaining structure

The design adopts the insulation system of external walls (the

thickness of XPS is 70mm), LOW-E insulating glass windows

with single plastic frame (5mm photopermeability+ 15mm

argon + 5mm diaphaneity), building unit sunshade and

aluminium alloy sunshade with movable roller shutters.

Insulation system of external walls Actual effects of external walls

LOW-E insulating glass windows


“Green” Technology adopted --—High energy efficiency building implements

It adopts energy-saving elevators, ground source heat

pumps, heat recovery system and ceiling radiation

refrigeration heating system etc.

The air-conditioning system uses heat recovery system

and fresh air processing system.

Combined type air treatment units

Screw-type water source heat pump units Energy-saving elevators

Radiat cooling system


“Green” Technology adopted—Solar photovoltaic generation system

Solar street lamps and

lawn lamps are

appropriate technologies

for green housing

construction.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Solar-thermal

collectors 538.89 584.81 586.99 420.70 518.24 628.31 685.86 624.97 709.15 521.74 641.11 714.38

natural gas 315.61 277.61 233.03 184.20 93.06 63.69 85.64 1.83 46.85 143.86 260.89 317.12

In this project, 78% of the total domestic hot water was produced by the solar thermal

collector in 2010.


“Green” Technology adopted—solar water heating

Statistics related to the hot-water generated by solar thermal collectors and natural gas

The proportion of hot-water produced by solar energy Comparison of hot-water output among all parts month by month


“Green” Technology adopted—Utilization of Nontraditional Water Source

The climate in Suzhou City belongs to north subtropical monsoon climate. The rainfall capacity in

this area is 1149mm and the rainfall mainly comes in summer so that Suzhou has natural condition of

rainwater use.

This project is designed by rainwater recycle system to collect rainwater on the roof and

the floor. Such rainwater is used to water the greenbelt and supply the landscape pool

after it has been disposed.

Water meter

No.

The last

numerical reading

The current

numerical reading

Practical water

consumption Time

70092737 0 50 50 Jan. 2011

70092737 50 160 110 Feb. 2011

70092737 160 4200 4040 Mar. 2011

70092737 4200 7500 3300 Apr. 2011


“Green” Technology adopted—Other techniques

biodegradation of domestic garbage

radiant ceiling capillary

trash classification and recovery

(color difference)

water purification

by constructed

wetland

A public GBL Project in Hangzhou, Zhejiang

Information about the project:

– Technical and economic indicators:

The floor space is 1348m2; the total built-up area is 4679m2, the building height is

18.5m with four aboveground floors.

– Type of construction:

The main body adopts steel frame construction.

– Main functions:

scientific researches, offices,

experiments and other matched

functions

GBDL ★ ★ ★


Green Building Science and Technology Adopted


Wind power generation

Air-vent

Independent control system

of temperature and humidity

LOW-E glass

Automatic-cleaning

terracotta panel

Ground source heat pump

Solar panel Day-lighting tube

Aerofoil-type

sunshade

Natural vent

Water cycle system

Wing-shape sun shield

Titanium-zinc board

Titanium-zinc board

Natural ventilation Design


中国建筑科学研究院上海分院

绿色与生态建筑研究中心

Temperature distribution inside

the building

Vector distribution of wind speed

on the first floor


on the second floor


on the third floor


on the fourth floor


at vertical section

Natural ventilation Design


中国建筑科学研究院上海分院

绿色与生态建筑研究中心

PMV (Predicted Mean Vote)

distribution on the second floor

of the building

Distribution of the age of air at the

vertical section

room Floor area m2 Heat source

W/ m2

Supply air

rate m3/s

Ventilation

rate h-1

Research room 1 49 22 0.448 7.8

Research room 2 49 22 0.452 7.9

Research room 3 49 22 0.458 8.0

Research room 4 49 22 0.466 8.2

Research room 5 59 19 0.499 7.2

Research office 6 76 19 0.910 10.3


Computer room8 52 20 0.503 8.3

Digital lab 9 103 19 0.971 8.1

Digital lab 10 103 19 0.955 7.9


The situation of heat source and air volume in each room on the second floor

Ventilation strategies

– Ventilation strategies

– Mechanical ventilation and air-conditioning

ventilation

Natural lighting Design

–Atrium lighting (sunshade-type dual silver LOW-E glass/ soft Amorphous Silicon

photovoltaic battery) + side window lighting (western and eastern sunshade-type dual silver

LOW-E glass/ northern and southern dual silver LOW-E glass with high photopermeability)

+ roof lighting by lighting tubes.


Solar photovoltaic generation:

–Amorphous Silicon photovoltaic battery at the Atrium

–Polycrystalline silicon photovoltaic battery on the roof

–Photovoltaic day-by-day system of ground landscapes

Wind power turbine generation:

–Vertical axis wind-power turbine generating system

GSHP

Energy Resources

Annual generated energy produced by renewable energy sources is 41990kW•h,

which accounts for 14% of the total electricity consumption.


Front side of the building

Photovoltaic optimum

arrangement

W

E

S

BIPV Solar Photovoltaic

battery

Polycrystalline silicon

Photovoltaic battery

Photovoltaic landscape

Summary

In recent years, the Chinese green building has

made rapid and accelerate development and is

keeping up the momentum. We would like to learn

from the good experiences of foreign countries in

the development process. I am looking forward to

the in-depth exchange of the green building issues

with you experts.

Green Building Research Center

Chinese Society for Urban Studies

TEL: +86-010 68720069

Fax: +86-010 68722119

Email: [email protected]

Website: www.csus-gbrc.org

THE 3RD ANNUAL TROPICAL SUBTROPICAL GREEN BUILDING ALLIANCE CONFERENCE

The Development of Green Building in China from the Point ... Building... · The selection of green building technologies take “practical， reasonable， economic， innovation”

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