Low Energy Building Design [presentation]

8/12/2019 Low Energy Building Design [presentation]

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Antonio Moura - March 2009

Low-Energy Building Design


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Low-energy building design is not just the

result of applying one or more isolatedtechnologies. (wind turbines, heat pumps,

etc

It is an integrated whole-building process that

requires advocacy and action on the part ofthe client and design team throughout the

entire project development process.


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Low-energybuilding

design

Micro

GenerationDesign

Building Energy

Management

Systems

Embodied

Energy of

Materials


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DesignShape of the Building

Passive Solar Design (orientation)Passive Solar Design (windows)

Movable Shadowing Devices


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Shape


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Shape


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Shape


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Passive Solar Design (shape)


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Passive Solar Design (extensions)


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Passive Solar Design (garages)


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Solar orientation & Movable shadowing devices


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Micro

GenerationHeat Pumps

Wind Turbines


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BEMSBuilding Energy Management Systems


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Software

The Facilities Managercan easily monitor and

override the System

1.Status Points (verifies conditions on & off)

2.Command points (switches on & off))

3.Analogue Input (measures analogue values)

4.Analogue Output (modulates analogue values)

Hardware


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Basic example


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If the Local Authority wishes to support the project,

they should display the same data to the public as well.

A screen in the entrance should display how

much energy the building is using & producing

on the moment, last day and last month.

All data should be available online all the

time.


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Green Wash

TES OOnline posts saying turbines

probably are not wired.No manufacturers name.

No info at ALL !!!

Italian manufacturer

6 Kw/h

Brand: ROPATEC


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MaterialsWith low Embodied Energy

Straw bales


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Dimensions of a typical straw bale:

350mm X 450mm X 1000mm

(14 X 18 X 39 approx.)

Weight: 30 K (66 pound)Cost per unit depends on season: 2.5 -

5.0 (delivery to be agreed)

A wall 3m X 6m (10 X 20) will need 60

straw bales (51 + 15%)

This photo is of a large Straw Bale building

in UK(Sworders Ltd, Fine-Art

Auctioneers based in Essex) with 1100m

(11,840 sq. foot or 0.272 acre).

This is a modern building with rainwater

catchments, solar water heating, bio-mass

space heating and lime rendered walls.

I t t C t ti D t il


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Important Construction Details

A good pairof boots

I t t C t ti D t il


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A good hat Important Constr ction Details


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WINDOWPOSITIONING

ADVANTAGES


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Low embodied energy:Straw bales are natural sub-product of crops

Thermal Insulation: Straw bales are superb insulators

Sound Insulation: Straw bales they act as a very efficient sound barrier.

Load bearing:The walls are incredible strongthe bales are not just pilled, they are tied down. It

is possible to use these types of walls as load bearing walls.

VOCs (volatile organic components): These walls can be built free of glues, plastics and paint thatrepresent a health issue.

The interior is renderedwith a clay based plaster and the exterior with a lime based plaster.

Cement should be avoided because the walls need to breathe.

Fire performance:Loose straw is very flammable and during the construction stage care must be

taken in order to avoid problems. Like paper, its easy to burn a single sheet but when trying to burnthe phone book everybody knows that its quite hard this is because the oxygen trapped inside

the bale is not enough to feed the combustion process.

Help availablewith this recovered technology: There are numerous books explaining different

construction methods. The internet is a good source of information as well.Amazonailsstrawbale

innovationis willing to help any project with their expertise.

ADVANTAGES:

DISADVANTAGES


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Supply chain:The bales are very susceptible to moisture content. There is nota formal supply (building merchants dont store them in their yards) and the

builder needs to explain carefully to the farmer that moisture above 20% will

damage the bales definitively.

Moisture: If the roof fails allowing water to get into the bales or dampness

arising from the bottom penetrates the walls the bales will rot and need to be

replaced.

Buildability: Building with strawbales is not a Sunday activity despite the

feeling transmitted during the course is not fun. It requires very skilful

workmanship to achieve the aim of good insulation and avoid dampnesspenetration. Strawbales are not standard materials like bricks and blocks and

good site management is required to keep quality at a high level. In short,

requires a skilful contractor otherwise this construction method is not advisable.

DISADVANTAGES:

MYTHS:


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Cost 1: Building with strawbales is not cheaper than othermethods. The purpose in using this material has two reasons:

It is a sustainable and renewable resource

It has remarkable insulating properties.

Cost 2: The external walls of a modern building represents

about 10-15% of the whole costs, so any savings will not

represent a major subject.

MYTHS:


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150

years

ago


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30/31we won we will win again


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Low Energy Building Design [presentation]

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