Presented at AIVC conference 2017 in Nottingham
RenovActive is a renovation project which took place in Brussels based on the concept of Climate Renovation that implies achieving an excellent indoor climate as well as a high energy performance. The house belongs to a social housing association and is renovated within the financial frame for social housing in Brussels, and renovated using standard solutions and products to facilitate future replications of the result. Seven generic replicable elements were applied; these elements can be used in other renovation projects and are described in the paper. The house is equipped with a mechanical extract ventilation system for winter use, and demand-controlled natural ventilation for warm periods and peak loads during winter. The house is occupied by a family, and physical measurements as well as social scientific enquiries are carried out during a two-year period from June 2017.
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Affordable and replicable renovation of social housing fulfilling indoor climate and energy targets thanks to seven replicable renovation elements
1. RenovActive
Affordable and replicable renovation of social
housing
– with seven replicable renovation elements
1
Nicolas Galiotto1, Peter Foldbjerg1, Jens Christoffersen1,
Thorbjørn Færing Asmussen1, and Sabine Pauquay2
1 VELUX A/S, Department of Daylight, Energy and Indoor
Climate
2VELUX Belgium, Brussels, Belgium
Peter.foldbjerg@velux.com
2. A HEALTHY AND AFFORDABLE RENOVATION CONCEPT
Ill-maintained homes are more common
in rental properties due to tenants’ lack
of ownership
Energy poverty means that nearly 11%
cannot afford to heat their home sufficiently
Incorrect behaviours, e.g. lack of regular
airing and the drying of clothes indoors,
lead to a bad indoor climate
The challenges of
social housing associations
Need for
affordable
and flexible
solutions
6. Before renovation After renovation
Ground
floor
First floor
Attic
Improving daylight conditions
7. Challenge: Overheating
Our selected RenovActive elements
Improved insulation
and air-tightness
create a need for
preventive solutions
against excessive
heat
Use sun screening to
prevent the building from
getting too hot.
Equip windows with
automated sun screening.
In summer, prioritise
natural ventilation. In
winter, combine natural
and mechanical
ventilation.
Use cross-ventilation and
stack effect to increase
ventilation rates.
For better thermal
comfort, keep your home
cool in summer.
Ensure you have well
insulated windows, walls
and roof so you keep the
heat outside.
3rd skin Respiratory
channel
Hybrid breathingEnvelope upgrade
8. Challenge: Mould and smells
Our selected RenovActive elements
Combine natural
ventilation all year round
and mechanical
ventilation in the winter.
Use adequate ventilation
flows when the building
envelope becomes more
airtight (required by
EPBD).
Keep your home warm in
winter.
Ensure you have
windows, walls and roof
with no cold surfaces.
Ensure good energy
balance of windows
(winter solar gains).
Humidity in buildings
is a major factor for
discomfort and health
issues. Reducing
humidity in buildings
helps cut asthma
by ½.
Respiratory
channel
Hybrid breathingEnvelope upgrade
9. Demand-controlled ventilation system
and sun screening
Sun shading
• Control of indoor climate by automated external sun shading
• Automated facade sun shading (Renson)
• Automated roof window sun shading (VELUX)
Hybrid ventilation system
• A demand-controlled (temperature, humidity, CO2, odour)
mechanical extraction ventilation (MEV – System C+) in
combination with demand-controlled natural ventilation (NV)
• When Toutdoor<14°C, air is taken in through window grills and
extracted by the C+ unit (mechanical extract)
• When Toutdoor>14°C, air is taken into the house through
automatically opened façade and roof windows and also extracted
through windows
10. RenovActive House
– our prototype and proof of concept
Before renovation After renovation
Net energy demand for heating 700 kWh/m² 25 kWh/m²
Primary energy consumption 1300 kWh/m² 82 kWh/m²
Ventilation Not ok Ok
Thermal comfort winter Not ok Ok
Thermal comfort summer Ok Ok
Energy class G B
Energy cost for building services
(excluding light and plug loads)
5,000 €/year 800 €/year
16. RenovActive
Affordable and replicable renovation of social housing
– with seven replicable renovation elements
23
Thank you!
Nicolas Galiotto1, Peter Foldbjerg1, Jens Christoffersen1,
Thorbjørn Færing Asmussen1, and Sabine Pauquay2
1 VELUX A/S, Department of Daylight, Energy and Indoor
Climate
2VELUX Belgium, Brussels, Belgium
Peter.foldbjerg@velux.com
Editor's Notes
We are aware that tenants might not always have the best behaviour indoors, when it comes to ensuring regular airings and maintaining a mould free environment. The tenants might also suffer from energy poverty, in the sense that they cannot afford to heat their home sufficiently. This is a situation that no one benefits from, and there seems to be a clear need for affordable and flexible solutions to this situation.
What kind of challenges are your facing?
We have created a small film that describes the concept, so please lean back and enjo
What kind of challenges are your facing?
So here we have the 7 elements, which we can dig further into if you would like to learn more about each of them [test click on one or two to demonstrate].
What kind of challenges are your facing?
1) Protect yourself form direct sunlight which is the first cause of overheating in houses sunscreen is the most efficient way. Although it is less critical than in winter, good insulation will help keep your home cool (Heat losses are proportional to the temperature difference between the inside and the outside. In winter it goes up to 30 ° C while in summer it is limited to about 5 ° C)
2) You can also protect yourself from overheating by choosing the right glass with a low shading factor (new glass with SF 0.3).
3) After you’ve protected yourself well from the sun, you’ll try to create natural ventilation to remove heat from the house
4) Finally, a stack effect will help that natural ventilation you’ve created
Avoiding cold surface is necessary to avoid mould and smell
A good ventilation rate can help avoid mould even if there are some cold surfaces. Although mechanical ventilation could do the job, natural ventilation will allow larger ventilation rate. Hybrid ventilation is so a great help.
Stack effetc will optimse the natural ventilation efficiency.
Avoiding cold surface is necessary to avoid mould and smell
A good ventilation rate can help avoid mould even if there are some cold surfaces. Although mechanical ventilation could do the job, natural ventilation will allow larger ventilation rate. Hybrid ventilation is so a great help.
Stack effetc will optimse the natural ventilation efficiency.
The RenovActive Concept was first implemented on this house, which we call the RenovActive House. The house was old and rundown, and in a very bad condition. But after applying our renovation concept, the house flows with daylight and fresh air. It is very attractive and energy efficient – and our calculations tell us that the energy bill can be reduced by up to 50%.
---------------
1 Manages more than 3600 dwellings in the Anderlecht municipality
The aim of the RenovActive project:
to create a new showcase to promote the Active House vision towards the market of social housing and one-family homes
to develop a sustainable and affordable renovation concept suitable for large-scale renovation and modernisation. A concept that can easily be reproduced both in financial and technical terms accessible for everyone