1. The Renson Headquarters Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept NatVent Back to “Select a building” Back to “Select a building”

2. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept 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%)

3. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept Building presentation (2|) ground floor first floor Offices Production hall N 45m 15m landscape office reception & show room meeting room drawing room office 4office 5office 6office 7office 1office 2office 3office 8

4. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept 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 renovation

5. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept 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

6. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept 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 ground floor first floor landscape office reception & show room meeting room production hal After renovation Mechanical extraction: ductwork in false ceiling Natural air supply: existing adjustable trickle ventilators above windows

7. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept Building concept (3…) Thermal summer comfort The following strategy was followed to improve summer comfort: REDUCTION of DIRECT SOLAR GAINS: FREE-COOLING & STORAGE: night ventilation & thermal mass GLOBAL STRATEGY for thermal comfort under summer conditions Overhangs & selective glazing Night ventilation: partly natural - partly mechanical

8. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept Several shading devices were evaluated using thermal simulations Finally a combination of overhangs + selective glazing was chosen Building concept (4…) Thermal summer comfort Reduction of solar heat gains

9. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept 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. Building concept (5…) Thermal summer comfort Reduction of solar heat gains 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)

10. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept Performance of overhang for south-west façade WINTER: Little shading - low position of sun SUMMER: Much shading - high position of sun Building concept (6…) Thermal summer comfort Reduction of solar heat gains Depth of overhang

11. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept Building concept (7…) Thermal summer comfort 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)...

12. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept production hall Night ventilation of first floor Building concept (8...) Thermal summer comfort Night ventilation Ventilation of ground floor chimney fan Large burglar-proof ventilation grille for intensive night ventilation

13. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept production hall Night ventilation of first floor Building concept (8...) Thermal summer comfort Night ventilation Ventilation of ground floor chimney fan chimney Chimney - internal view & control panel

14. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept 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

15. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept Monitoring results (1…) Several parameters were monitored during the summer of ‘97: temperatures, air changes, CO 2 -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)

16. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept Monitoring results (2|) Summer ‘97 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...

17. NatVent Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Back to “Select a building” Back to “Select a building” Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept 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

18. More information... NatVent Back to “Select a building” Back to “Select a building” Renovation issue Renovation issue Major findings Major findings The RENSON- The RENSON- Headquarters More information... More information... Monitoring results Monitoring results Building presentation Building presentation Indoor Air Quality Indoor Air Quality Summer Comfort Summer Comfort Building concept Building concept 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