Norwegian Building Research Institute P.O.Box 123 Blindern Forskningsveien 3B 0314 Oslo Norway +47...

Norwegian Building

Research Institute

P.O.Box 123 Blindern

Forskningsveien 3B

0314 Oslo Norway

+47 22965500 +47 22965725

Contact persons:

J.T. Brunsell ([email protected])

P. Blom ([email protected])

E. Skaaret ([email protected])

T. Hestad ([email protected])

P.O.Box 123 Blindern

Forskningsveien 3B

0314 Oslo Norway

+47 22965500 +47 22965725

Contact persons:

J.T. Brunsell ([email protected])

P. Blom ([email protected])

E. Skaaret ([email protected])

T. Hestad ([email protected])

NatVent project,WP3/A3.3

Natural ventilation with heat recovery

NatVent project,WP3/A3.3

Natural ventilation with heat recoveryHeat recoveryHeat recovery

Back to Back to “WP3”“WP3”

Why & targetWhy & target

2 Systems2 Systems

NBI’s systemNBI’s system

MeasuringMeasuring

ConclusionsConclusions

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Driving forcesDriving forces

NatVent

mailto:[email protected]














































http://www.byggforsk.no/english.htm

NatVent

Heat recoveryHeat recovery



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Energy recovering from natural ventilation systems

Because of two reasons in moderate and cold climate: 1.To recover energy 2.To supply preheated air

Because of two reasons in moderate and cold climate: 1.To recover energy 2.To supply preheated air

Work content WP 3.3Natural ventilation with heat recovery Requirements of a system with heat recovery for an office

building. Evaluate the energy saving potential. Develop advanced systems with heat recovery Laboratory testing of system.

Work content WP 3.3Natural ventilation with heat recovery Requirements of a system with heat recovery for an office

building. Evaluate the energy saving potential. Develop advanced systems with heat recovery Laboratory testing of system.

NatVent




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Distribution of natural driving forces

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Internal air supply - system 1 (1...)

NatVent




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Internal air supply - system 2 (2|)

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NBI’s NatVent system with heat recovery (1...)

Lab.hall

c=100,30

c= 114,1

Test-room

ø500

ø400

ø315

ø500

Storey

5

4

3

2

1

0

ø315

ø400

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System outdoors (2...)

2000

2400

ø500

-

Opening for filter

1000

Insulation

ø500 200 ø500

6001400

600

ca300

ca500

1000

1000x1000285 115

Door

580x860

Cooling coil

Assisting fanvol.controller

Automatic closingshutters 776x776on 4 sides

2000

2400

ø500

-

Opening for filter

1000

Insulation

ø500 200 ø500

6001400

600

ca300

ca500

1000

1000x1000285 115

Door

580x860

Cooling coil

Assisting fanvol.controller

Automatic closingshutters 776x776on 4 sides

NatVent




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System Indoors (3|)

+ 500

600

700

ø500

ø500

50 mm insulation

600 500

150

280

H.coil

El.filter

1800

Inlet chamber

Changeable plate

Rounded outlet Door

Drainage

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MeasuringMeasuring


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Measurements

Temperatures Outdoor Indoor Outgoing air Incoming air

Pressure drops Across the filter Across both sides of the

heat recovery Total for the system

including ducts and terminals

Temperatures Outdoor Indoor Outgoing air Incoming air

Pressure drops Across the filter Across both sides of the

heat recovery Total for the system

including ducts and terminals

Velocity In the ducts, gives the air

flow Wind

Driving forces Natural

– Temp. dif.– Wind

Assisting fan

Filter efficiency

Heat recovery efficiency

Velocity In the ducts, gives the air

flow Wind

Driving forces Natural

– Temp. dif.– Wind

Assisting fan

Filter efficiency

Heat recovery efficiency

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Pressure lossesat design value: 400 l/s

Component Paoutlet to atmosphere 1,2heat exchanger 3,1extract duct and terminals 8,4Total sum 12,7

Extract Extract sideside

Component Paintake and vertical duct 11,3filter 1,0heat exchanger 6,5supply ducting and terminals 19,4Total sum 38,2

Supply Supply sideside

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Measurement modes

Without any fans

With extract fan (most of the time)

With both extract and supply fan

Without any fans

With extract fan (most of the time)

With both extract and supply fan

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Temperatures & air flow(without fans)

-10

0

10

20

30

40

01.03.98 03.03.98 05.03.98

Tem

p.

(°C

),

win

d

(m/s

)

-200

-100

0

100

200

300

Air

flo

w (

l/s)

wind

t out

t supply

q supply

q exhaust

t exhaust

-10

0

10

20

30

40

01.03.98 03.03.98 05.03.98

Tem

p.

(°C

),

win

d

(m/s

)

-200

-100

0

100

200

300

Air

flo

w (

l/s)

wind

t out

t supply

q supply

q exhaust

t exhaust

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Air Flow vs Natural Driving forces

0

50

100

150

200

250

300

350

10 15 20 25

Natural driving forces (Pa)

Air

flo

w

(l/s

)

q extract

q supply

Linear (q extract)

Linear (q supply)

0

50

100

150

200

250

300

350

10 15 20 25

Natural driving forces (Pa)

Air

flo

w

(l/s

)

q extract

q supply

Linear (q extract)

Linear (q supply)

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Temperatures & air flow(extract fan running)

-10

-5

0

5

10

15

20

25

06.03 07.03 08.03 09.03 10.03

Te

mp

. (°C

), w

ind

(m

/s)

-250

-150

-50

50

150

250

350

450

Air

Flo

w (

l/s)

t out

wind

q supplyt supply

t extract

q extract

-10

-5

0

5

10

15

20

25

06.03 07.03 08.03 09.03 10.03

Te

mp

. (°C

), w

ind

(m

/s)

-250

-150

-50

50

150

250

350

450

Air

Flo

w (

l/s)

t out

wind

q supplyt supply

t extract

q extract

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Extract & supply fan (without pump running)

0

5

10

15

20

25

30

01.06 03.06 05.06 07.06 09.06

Tem

p. (

°C),

win

d (

m/s

)

150

200

250

300

350

400

450

Air

flo

w (

l/s)

t extract

t supply

t out

Wind

q extract and q supply

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Fan power & natural driving forces (pump turned off)

0

2

4

6

8

10

12

14

16

18

20

01.06 03.06 05.06 07.06 09.06

Tem

p. (

°C),

win

d (

m/s

)

0

10

20

30

40

50

60

70

80

90

100

Fan

Po

wer

, P, (

W)

Wind

P extract

Temp. diff. inside - outside

P supply

0

2

4

6

8

10

12

14

16

18

20

01.06 03.06 05.06 07.06 09.06

Tem

p. (

°C),

win

d (

m/s

)

0

10

20

30

40

50

60

70

80

90

100

Fan

Po

wer

, P, (

W)

Wind

P extract

Temp. diff. inside - outside

P supply

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Extract fan power vs nat. driving force(regulating at 400 l/s)

0

5

10

15

20

25

30

35

40

0 10 20 30 40

Wind and Thermal Driving Force (Pa)

Fan

Pow

er (W

)

6.3-31.31.4-2.414.4-23.4Trend

regulator

Dates:

0

5

10

15

20

25

30

35

40

0 10 20 30 40

Wind and Thermal Driving Force (Pa)

Fan

Pow

er (W

)

6.3-31.31.4-2.414.4-23.4Trend

regulator

Dates:

NatVent




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Conclusions

Heat recovery should be considered in natural ventilated office buildings in cold climates

Practical concepts existed and have been further developed Concepts must involve a close integration with the building

design Heat recovery may require assisting fans for stabilising air

flows. Assisting energy efficient fans may act as efficient flow

controllers Measured heat recovery efficiency is 0,5 but can be further

improved Natural ventilation with heat recovery is economic and

technical competitive with traditional systems today

Heat recovery should be considered in natural ventilated office buildings in cold climates

Practical concepts existed and have been further developed Concepts must involve a close integration with the building

design Heat recovery may require assisting fans for stabilising air

flows. Assisting energy efficient fans may act as efficient flow

controllers Measured heat recovery efficiency is 0,5 but can be further

improved Natural ventilation with heat recovery is economic and

technical competitive with traditional systems today

More information...

You can fin more information on:

Heat recovery and the work carried out in the framework of Task 3.3. in the document ‘3.3_heat recovery.pdf’ in the directory \Reports\ Technological solutions

You can fin more information on:

Heat recovery and the work carried out in the framework of Task 3.3. in the document ‘3.3_heat recovery.pdf’ in the directory \Reports\ Technological solutions

You can read and print pdf-files with the Acrobat® Reader ®3.0. Program. This program is free.

Download it from the Acrobat web site: www.adobe.com OR run the installation file ar32e301(1).exe in the directory \Installation

You can read and print pdf-files with the Acrobat® Reader ®3.0. Program. This program is free.

Download it from the Acrobat web site: www.adobe.com OR run the installation file ar32e301(1).exe in the directory \Installation




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NatVent

Norwegian Building Research Institute P.O.Box 123 Blindern Forskningsveien 3B 0314 Oslo Norway +47...

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Transcript of Norwegian Building Research Institute P.O.Box 123 Blindern Forskningsveien 3B 0314 Oslo Norway +47...