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3.9 INSULATION: CALCULATING THERMAL PERFORMANCE

INVESTIGATION Can innovative insulation types achieve necessary thermal resistance in the water collector roof assembly?

WATER COLLECTOR ROOF SECTION

DETAIL OF ROOF ASSEMBLY 1:10 DOES WATER HAVE AN R VALUE? Water essentially has an R value of 0. With one side against the warm building and one side against the cool air a convection loop is established transferring heat efficiently. Water does have excellent thermal mass but must be insulated from the outdoors.

1

2 3

4

ROOF SECTION LOCATION 5

6 7 8 9

ROOF ASSEMBLY 1 2 3 4 5 6 7 8 9

WHAT TYPE OF INSULATION TO USE? Different types of insulation have different advantages and disadvantages. What kind of insulation balances cost, effectiveness, and project narrative? TYPE

ADVANTAGES

DISADVANTAGES

BATTS AND BLANKETS EX: FIBERGLASS

NON-FLAMMABLE RESISTANT TO MOISTURE

ENVIRONMENTAL ISSUES, IRRITANT

LOOSE FILL EX: CELLULOSE

ENVIRONMENTALLY FRIENDLY PAPER/CARDBOARD

RISK OF MOISTURE AND PEST INFESTATION

DENIM

RECYCLED MATERIAL, MAKES USE OF PILGRIM’S OLD CLOTHES

POTENTIALLY MORE EXPENSIVE AND DIFFICULT TO INSTALL

INSULATED PANELS

HANDLES HIGH TEMPERATURES

MORE DIFFICULT INSTALLATION

SPRAY FOAM

EXCELLENT AIR BARRIER, FITS ODD SHAPES

EXPENSIVE, NOT VERY THICK

0-300mm VARIABLE WATER LEVEL 10mm MARBLE TILE 2 LAYERS WATERPROOF MEMBRANE 200mm COMPOSITE CONCRETE DECK 360mm INSULATION FILLED CAVITY 40mm RIGID INSULATION 40mm STEEL STUD FRAMING 10mm RIGID BACKBOARD 10mm MARBLE TILE

CALCULATING ASSEMBLY INSULATION VALUES

WHY DENIM?

MATERIAL

THICKNESS

R VALUE

R VALUES ROOF

MARBLE TILE

10mm

0.00483

RSI inside surface = 0.10

WATERPROOF MEMBRANE

2mm

0.05

CONCRETE DECKING

200mm

0.1

DENIM INSULATION

360mm

7

RIGID INSULATION

40mm

1.4

PLYWOOD

10mm

0.09

MARBLE TILE

10mm

0.00483

U=

Denim insulation allows pilgrims to contribute to the materials used on site. Denim insulation is an existing product available from several manufacturers with excellent thermal properties.

1 RSI + RSO + RA + R1 + R2 + R3 ...

U = 0.11377

1

OLD DENIM IS COLLECTED AND SORTED

DENIM PULP IS PRESSED INTO SHEETS AND ROLLED FOR TRANSPORT

DENIM IS SHREDDED UNTIL CONSISTENT PULP AND METAL BUTTONS REMOVED

DENIM SHEETS ARE CUT ON SITE AND INSTALLED LIKE REGULAR BATT STYLE INSULATION

Baden-Powell, Charlotte. Architect’s Pocket Handbook. Elsevier, Oxford, 2002 Inno Therm Cotton And Denim Thermal Insulation. http://www.inno-therm.com/. Accessed 10 May 2017

THE GRAND TOUR OF EUtopia

2

RS0 outside surface = 0.04

PASSIVHAUS The standard U value for passivhaus certification is 0.15. The extremely thick denim insulation layer in the beam cavity helps this assembly reach U=0.11. There is risk of thermal bridging at the beams.

DEFINITIONS

EQUATIONS

THERMAL CONDUCTIVITY (k-value) The heat (W) transmitted through unit area (m²) of material of unit thickness (m) for unit temperature difference (K) between inside and outside environments, expressed as W/mK

U=

THERMAL RESISTANCE (r-value) A measure of how well a material resists the flow of heat by conduction. The reciprocal of thermal conductivity, mK/W

R=

3

THERMAL RESISTANCE (R-value) This means how well a particular thickness of material resists the passage of heat by conduction, calculated from the r-value in units of m²K/W.

4

THERMAL TRANSMITTANCE (U-value) The reciprocal of thermal resistance W/m²K. This measures the amount of heat transmitted per unit area of the fabric per unit temperature difference between inside and outside

1 RSI + RSO + RA + R1 + R2 ...

K-value Material thickness

CONCLUSION The use of denim insulation is both effective and allows the pilgrims to take part in the supply of construction materials.

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The Grand Tour of EUtopia. Design Realisation  

Relocating across memory to critique the contemporary European Union. The Grand Tour of EUtopia is a modern pilgrimage critiquing the role o...

The Grand Tour of EUtopia. Design Realisation  

Relocating across memory to critique the contemporary European Union. The Grand Tour of EUtopia is a modern pilgrimage critiquing the role o...

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