the renson headquarters renovation issue renovation issue major findings major findings the renson-...

The Renson Headquarters

Renovation issueRenovation issue

Major findingsMajor findings

The RENSON-The RENSON-HeadquartersHeadquarters

More More information...information...

Monitoring Monitoring resultsresults

Building Building presentationpresentation

Indoor Air Indoor Air QualityQuality

Summer Summer ComfortComfort

Building conceptBuilding concept

NatVent

Back to Back to “Select a “Select a building”building”

NatVent











Building presentation (1…)

The Renson company produces components for natural ventilation Headquarters are situated in industrial zone along a busy road Floor area: 1.350 m² Two storey building - prefabricated concrete elements Building façades

rear side of building: connected to production hall front façade:

– along busy road– south-west oriented– considerable net surface of glazing (25%)

The Renson company produces components for natural ventilation Headquarters are situated in industrial zone along a busy road Floor area: 1.350 m² Two storey building - prefabricated concrete elements Building façades

rear side of building: connected to production hall front façade:

– along busy road– south-west oriented– considerable net surface of glazing (25%)

NatVent











Building presentation (2|)

ground floor

first floor

Offices

Production hall N

45m

15mlandscape office reception & show room

meeting room

meeting room

drawing room

office 4 office 5 office 6 office 7office 1 office 2 office 3 office 8

NatVent











1. THERMAL COMFORT: Due to the large glazing surfaces in the front façade there were serious

problems of overheating in summertime

2. INDOOR AIR QUALITY: Before the renovation the ventilation system consists only of adjustable

trickle ventilators above the windows.

It is clear that the performances of this system depend on the wind pressure on the front façade. As the wind pressure fluctuate strongly, also the air flows (energy losses) and the indoor air quality fluctuates strongly.

1. THERMAL COMFORT: Due to the large glazing surfaces in the front façade there were serious

problems of overheating in summertime

2. INDOOR AIR QUALITY: Before the renovation the ventilation system consists only of adjustable

trickle ventilators above the windows.

It is clear that the performances of this system depend on the wind pressure on the front façade. As the wind pressure fluctuate strongly, also the air flows (energy losses) and the indoor air quality fluctuates strongly.

The renovation issue

production hall

Before renovationBefore renovation

NatVent











The building concept (1…)

In 1997 the idea arose of a thorough renovation to tackle the

problems of: overheating

fluctuating air flows

(see Chapter ‘Renovation issue’)

A detailed study of the renovation was carried out by the BBRI to

evaluate different renovation solutions: type of solar shading

possibilities and effect of intensive night ventilation

a new ventilation system based on natural supply and mechanical

exhaust

In 1997 the idea arose of a thorough renovation to tackle the

problems of: overheating

fluctuating air flows

(see Chapter ‘Renovation issue’)

A detailed study of the renovation was carried out by the BBRI to

evaluate different renovation solutions: type of solar shading

possibilities and effect of intensive night ventilation

a new ventilation system based on natural supply and mechanical

exhaust

NatVent











The building concept (2…) Indoor Air Quality

To improve the stability of the air flows a system of natural supply & mechanical extraction was installed

Advantages: constant air flow (and IAQ) during office hours adapted air flow in meeting rooms reduced air flows (and ventilation losses) outside office hours

To improve the stability of the air flows a system of natural supply & mechanical extraction was installed

Advantages: constant air flow (and IAQ) during office hours adapted air flow in meeting rooms reduced air flows (and ventilation losses) outside office hours

ground floor

first floor

landscape office reception & show room

meeting roomproduction

hal

After renovationAfter renovation

Mechanical extraction: ductwork in false ceiling

Natural air supply: existing adjustable trickle ventilators above windows

NatVent











Building concept (3…) Thermal summer comfort

The following strategy was followed to improve summer comfort:

The following strategy was followed to improve summer comfort:

REDUCTION of DIRECT REDUCTION of DIRECT

SOLAR GAINS:SOLAR GAINS:

REDUCTION of DIRECT REDUCTION of DIRECT

SOLAR GAINS:SOLAR GAINS:

FREE-COOLING & FREE-COOLING & STORAGE:STORAGE:

night ventilation & night ventilation & thermal massthermal mass

FREE-COOLING & FREE-COOLING & STORAGE:STORAGE:

night ventilation & night ventilation & thermal massthermal mass

GLOBAL STRATEGY for GLOBAL STRATEGY for thermal comfort under thermal comfort under

summer conditionssummer conditions

GLOBAL STRATEGY for GLOBAL STRATEGY for thermal comfort under thermal comfort under

summer conditionssummer conditions

Overhangs &Overhangs &

selective glazingselective glazing

Overhangs &Overhangs &

selective glazingselective glazing

Night ventilation: Night ventilation:

partly natural - partly natural - partly mechanicalpartly mechanical

Night ventilation: Night ventilation:

partly natural - partly natural - partly mechanicalpartly mechanical

NatVent











Several shading devices were evaluated using thermal simulations Finally a combination of overhangs + selective glazing was chosen

Several shading devices were evaluated using thermal simulations Finally a combination of overhangs + selective glazing was chosen


Reduction of solar heat gains

10

15

20

25

30

35

40

8/06/960:08

8/06/9612:08

9/06/960:08

9/06/9612:08

10/06/960:08

10/06/9612:08

11/06/960:08

11/06/9612:08

12/06/960:08

12/06/9612:08

13/06/960:08

13/06/9612:08

14/06/960:08

14/06/9612:08

time (days)

tem

pe

ratu

re (

°C)

Reference model

External temperature

Horizontal overhang

External screen Selective glazing

NatVent











Selective glazing: HEAT: This special type of glazing has a

low solar transmission (g-value = 34% instead of 77% for double glazing).

LIGHT: However due to a special coating technology still 66% of the light is still transmitted.

Selective glazing: HEAT: This special type of glazing has a

low solar transmission (g-value = 34% instead of 77% for double glazing).

LIGHT: However due to a special coating technology still 66% of the light is still transmitted.



Overhangs: The performances of the overhangs

depend on the orientation of the façade

and the position of the sun (see chart - next

slide)

Overhangs: The performances of the overhangs

depend on the orientation of the façade

and the position of the sun (see chart - next

slide)

NatVent











0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

31

-De

c

30

-Ja

n

1-M

ar

31

-Ma

r

30

-Ap

r

30

-Ma

y

29

-Ju

n

29

-Ju

l

28

-Au

g

27

-Se

p

27

-Oct

26

-No

v

26

-De

c

25

-Ja

n

Ave

rag

e sh

adin

g o

n w

ind

ow

(%

)1.4 m

1.2 m

1.0 m

0.8 m

0.6 m

Performance of overhang for south-west façade

WINTER: Little shading - low position of sun

SUMMER: Much shading - high position of sun



Depth of overhang

NatVent












Night ventilation

Night ventilation:

Supply: natural supply through large grilles in front façade

Extraction: Natural extraction for offices

on ground floor: based on stack effect of chimney on the roof

Mechanical extraction (fan) for offices on first floor ( There were practical problems to install a chimney)...

Night ventilation:

Supply: natural supply through large grilles in front façade

Extraction: Natural extraction for offices

on ground floor: based on stack effect of chimney on the roof

Mechanical extraction (fan) for offices on first floor ( There were practical problems to install a chimney)...

NatVent











production hall

production hall

Night ventilation of first floor

Building concept (8...) Thermal summer comfort

Night ventilation

Ventilation of ground floor chimneychimney

fanfan

Large burglar-proof ventilation grille for intensive night ventilation

Large burglar-proof ventilation grille for intensive night ventilation

NatVent











production hall

production hall

Night ventilation of first floor

Building concept (8...) Thermal summer comfort

Night ventilation

Ventilation of ground floor chimneychimney

fanfan

chimneychimney

Chimney - internal view & control panelChimney - internal view & control panel

NatVent











Building concept (9|) Thermal summer comfort

Night ventilation - remark

The potential for night ventilation in this office will be limited because the low accessibility of the thermal mass. The offices have:

false ceilings carpeted floors light internal walls

The potential for night ventilation in this office will be limited because the low accessibility of the thermal mass. The offices have:

false ceilings carpeted floors light internal walls

NatVent











Monitoring results (1…)

Several parameters were monitored during the summer of ‘97: temperatures, air changes, CO2 -conc.,...

Renovation had not been completed before the monitoring began:

Solar shading (selective glazing & overhangs) were not yet installed

Night ventilation– large supply grilles were installed– extraction chimney & fan not yet

installed: (building was ventilated by opening doors to the production hall)

Several parameters were monitored during the summer of ‘97: temperatures, air changes, CO2 -conc.,...

Renovation had not been completed before the monitoring began:

Solar shading (selective glazing & overhangs) were not yet installed

Night ventilation– large supply grilles were installed– extraction chimney & fan not yet

installed: (building was ventilated by opening doors to the production hall)

NatVent











Monitoring results (2|) Summer ‘97

5

10

15

20

25

30

35

1/8 2/8 3/8 4/8 5/8 6/8 7/8 8/8 9/8 10/8 11/8 12/8 13/8 14/8 15/8 16/8 17/8 18/8

time (days)

tem

per

atu

re (

°C)

office 1&2 office 3 office 4 exterior

Due to the lack of solar shading (renovation not yet completed) The internal temperatures are too high: >30°C

For more results: see the detailed Monitoring Report (see Chapter: “More information…”

Due to the lack of solar shading (renovation not yet completed) The internal temperatures are too high: >30°C

For more results: see the detailed Monitoring Report (see Chapter: “More information…”

Still: More about night ventilation: x ACH / working thermal mass...

NatVent











Major Findingds The monitoring results show that there is a need for solar shading

(as foreseen in the total renovation plan) As the renovation had not been completed before the monitoring

began one can not draw conclusions on the concept.

There were specific problems with the renovation of this building It was difficult to ventilate all the offices at night by natural ventilation

(practical problems to install second chimney replaced by fan)

The building has a low accessibility of the thermal mass

The monitoring results show that there is a need for solar shading (as foreseen in the total renovation plan)

As the renovation had not been completed before the monitoring began one can not draw conclusions on the concept.

There were specific problems with the renovation of this building It was difficult to ventilate all the offices at night by natural ventilation

(practical problems to install second chimney replaced by fan)

The building has a low accessibility of the thermal mass

More information...

NatVent











Find more information on the PROBE building in the following documents:

\Reports \Monitoring Reports \Summary Reports\be3summ.pdf global presentation of the buildings (4p./building) contents: building description - ventilation strategy and technology -

winter and summer monitoring results - conclusions

\Reports \Monitoring Reports \Detailed Reports\be3det.pdf detailed reports of all 19 monitoring campaigns (20p./campaign) contents: monitoring set up - analysis of results - conclusions

Find more information on the PROBE building in the following documents:

\Reports \Monitoring Reports \Summary Reports\be3summ.pdf global presentation of the buildings (4p./building) contents: building description - ventilation strategy and technology -

winter and summer monitoring results - conclusions

\Reports \Monitoring Reports \Detailed Reports\be3det.pdf detailed reports of all 19 monitoring campaigns (20p./campaign) contents: monitoring set up - analysis of results - conclusions

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

the renson headquarters renovation issue renovation issue major findings major findings the renson-...

Documents