"Energy renovation and occupant behaviour: towards a correct prediction of real energy savings in...

"Energy renovation and occupant behaviour:towards a correct prediction of real energy savings in dwellings” (FEA-PhD-symp. 05/12/2012)

Marc Delghust1

Energy renovation and occupant behaviour:towards a correct prediction of real energy savings in dwellings

Marc [email protected]

---Research group on Building Physics, Construction & Climate Control

Department of Architecture & Urban Planning (va&s) // Faculty of Engineering and Architecture

Ghent University (UGent)VITO

Ph.D.-Fellow, FWO-VITO-scholarship( Prof. A. Janssens [UGent], Yves Deweerdt [Vito] )

mailto:[email protected]


Marc Delghust

[background – problem]

ENERGY USE in DWELLINGS

75%space

heating

EPB … EPC ... EAP

Standardised calculation modelsVery fast calculation

Ease of use

...widely spread, used, known

+compulsory


Marc Delghust3

boundary conditions3. exterior4. interior

CALCULATED ENERGY USE

building1. envelope2. techniques

1

3

4

2

default values + detailed overrides

standardized average

! interacting

user behaviour !

qualitative quantitative√ X

default valuesstandardized average



Marc Delghust4

100%

75%

50%

25%

0

50

100

150

200

250

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400

0 50 100 150 200 250 300 350 400

mea

sure

d: Q

H,re

al [k

Wh/

(m².

a)]

calculated: QH,model [kWh/(m².a)]

CS1_EPBD CS3_EPBD

theoretical gain

real gain ?

energy use: heating


??


Marc Delghust5

a comprehensive approachon complementary case-studies

buildings

users

performance

measurements

surveys

models

reality


Marc Delghust6

a comprehensive approachon complementary case-studies

Different houses:• clusters of nearly identical houses• different clusters: neighbourhoods

buildings users

Different households• within a neighbourhood• between neighbourhoods


Marc Delghust7

[building – user – performance]

different housesmeasurements


Marc Delghust8

different ways of living and thinking

Who?households & individuals

How?use & interaction

Happy?appreciation & aspirations

Why?

Do they know?...

What if?


surveys


Marc Delghust9

0.0

0.1

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1.0

01:00

02:00

03:00

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00:00

bedr. 1 bedr. 2 bedr. 3 bathroom kitchen living room

Probability of opening a window

surveys


0.0

0.1

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1.0

01:00

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bedrooms bathroom kitchen living room

Probability of heating

user + building = interaction in space & time


Marc Delghust10

100%

75%

50%

25%

0

50

100

150

200

250

300

350

400

0 50 100 150 200 250 300 350 400

mea

sure

d: Q

H,re

al [k

Wh/

(m².

a)]


CS1_EPBD

100%

75%

50%

25%

0

50

100

150

200

250

300

350

400

0 50 100 150 200 250 300 350 400

mea

sure

d: Q

H,re

al [k

Wh/

(m².

a)]


CS1_EPBD EPBD_adapted

100%

75%

50%

25%

y = 0.5939x - 0.3125R² = 0.5621

0

50

100

150

200

250

300

350

400

0 50 100 150 200 250 300 350 400

mea

sure

d: Q

H,re

al [k

Wh/

(m².

a)]


CS1_EPBD 8-zone Linear (8-zone)

+

100%

75%

50%

25%

y = 0.7158x + 2.5044R² = 0.6369

0

50

100

150

200

250

300

350

400

0 50 100 150 200 250 300 350 400

mea

sure

d: Q

H,re

al [k

Wh/

(m².

a)]


CS1_EPBD 8-zone detail Linear (8-zone detail)

+

[building + user = performance]


Marc Delghust11

[conclusions & challenges]

importance of user behaviour

… but don’t blame the user for everything

• complex human beings• comfort expectation• living interaction• evolving reality• …

• models: • uncertainties: model + input• applicability: label <> real energy use• practicality: work + calculation time, …• validation: different houses & users

100%

75%

50%

25%

0

50

100

150

200

250

300

350

400

0 50 100 150 200 250 300 350 400

mea

sure

d: Q

H,r

eal [k

Wh/

(m².

a)]


CS1_EPBD CS3_EPBD


Marc Delghust12

Energy renovation and occupant behaviour:towards a correct prediction of real energy savings in dwellings

Marc [email protected]

---Research group on Building Physics, Construction & Climate Control

Department of Architecture & Urban Planning (va&s) // Faculty of Engineering and Architecture

Ghent University (UGent)

Ph.D.-Fellow, FWO-VITO-scholarship( Prof. A. Janssens [UGent], Yves Deweerdt [Vito] )

mailto:[email protected]

"Energy renovation and occupant behaviour: towards a correct prediction of real energy savings in...

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