Sem 2 - Fabric & Performance

Question 1

To meet the targets of the climate change act in 2050 the UK will need to reduce by at least what a year

Answer 1

3%

Question 2

What is Heat Conduction.

Answer 2

The transfer of heat from one substance to another due to direct contact..

Question 3

What part of the building regulations applies to heat loss in commercial construction.

Answer 3

L2A

Question 4

What is the optimum building orintation to reduce solar gains.

Answer 4

East - West. This orintation lets you harness daylight and control glare along the faces of the building.

Question 5

What are the units for thermal conductivity

Answer 5

w/mk

Question 6

Contribute to global emissions reductions to limit global temperature rises is the work of the…

Answer 6

Paris climate agreement.

Question 7

What are two examples of Outstanding BREEAM design for thermal admittance

Answer 7

Bloomberg Building, London (Norman Foster design)

The Bullitt Center, Seattle (Zero Carbon Building)

Question 8

What has the Goverment committed to within the Climate Change Act

Answer 8

Reduce emissions by at least 80% of 1990 levels by 2050

Question 9

Demonstrating that a building has appropriate passive control measures to limit solar gains is the requirtments of what part of the building regs.

Answer 9

L2A

Question 10

How do you calculate an R-Value

Answer 10

Thickness of material divided by the thermal conductivity of that material. If material is in mm divide that by a 1000 before dividing by the thermal conductivity.

Question 11

In domestic construction, what is the biggest consumption of energy and what percentage is the usage

Answer 11

Space Heating - 61%

Question 12

What are the units for R-Values

Answer 12

m2k/w

Question 13

In Commercial construction, what is the biggest consumption of energy and what percentage is the usage

Answer 13

Space Heating - 45% although lighting is much higher than domestic at 21%

Question 14

What are the units for fabric heat loss

Answer 14

Watts

Question 15

What does R-Value represent and mean

Answer 15

Resistence to heat transfer

Question 16

What does R-Value represent

Answer 16

Thermal resistance; how much of a fight the material puts up against the heat passing through it, for a given thickness and area.

Question 17

What is the best way to even out temperature swings from the suns heat.

Answer 17

More glazing to the east (where sun rises) to allow for solar gains. More thermal mass in the west (where sun sets) to absorb the heat.

Question 18

What is the Part L Uvalue limit for windows

Answer 18

2.20w/m2k

Question 19

Thermal bridging equates to roughly what percentage of the heat loss within a building

Answer 19

15-30%

Question 20

What is the Part L Uvalue limit for roofs

Answer 20

0.25w/m2k

Question 21

Thermal admittance (or heat transfer) is what

Answer 21

The ability of a material to absorb and release heat from an internal space, as that space’s temperature changes.

Question 22

What is the term used to describe the resistance to the passage of heat.

Answer 22

Thermal Resistance.

Question 23

Increased heat loss at the floor and ceiling junctions can what.

Answer 23

Lead to cold spots which will increase the risk of condensation and mould.

Question 24

What is the Part L Uvalue limit for floors

Answer 24

0.25w/m2k

Question 25

How is a Uvalue measured

Answer 25

The Uvalue of a building component (roof, wall, window) measures the amount of energy (heat) is lost through a square meter of that material for every degree (k) difference in temperature between the inside and outside.

Question 26

What is the Part L Uvalue limit for AOVs

Answer 26

3.5w/m2k

Question 27

What is the Part L Uvalue limit for walls

Answer 27

0.35w/m2k

Question 28

Using components with the recommended UValues doesn’t necessarily mean compliance with L2A. Compliance needs to be demonstrated by meeting what 5 seperate criteria

Answer 28

The calculated CO2 rate for the building or building emission rate (BER) must not be greater than the target emission rate (TER) Demonstrate the building has appropriate measure of passive control to limit solar gains. The necessary provisions put in place for enabling energy efficient operation of the building.

Question 29

What is the calculation for fabric heat loss

Answer 29

U-Value x Area (m2) x Temp Difference

Question 30

Why does heat loss occur?

Answer 30

Energy always wants to be stable so the warmer air inside a building is looking to move outside into the cold to neutralise

Question 31

R-value is expressed as

Answer 31

m2K/W

Question 32

The amount of heat loss within a building depends on what three things

Answer 32

The Conductivity of the component. The area of the component and the temperature difference across the component.

Question 33

What building component is the biggest contributor to heat loss and what percentage does this equate to.

Answer 33

Windows - 26%

Question 34

What is the calculation for U-Value

Answer 34

1 divided by the sum of all R-Values

Question 35

Reduce emissions by at least 80% of 1990 levels by 2050 is the modus of the…

Answer 35

Climate Change Act laid down by Parliament

Question 36

What is the mean ojective of the Paris climate agreement

Answer 36

To limit the amount of greenhouse gases emitted by human activity to the same levels that trees, soil and oceans can absorb naturally.

Question 37

What are the units for U-Values

Answer 37

w/m2K

Question 38

What are the specs for a passivhaus

Answer 38

• Super insulation; all elements of envelope should not have a uValue greater than 0.15 w/m2K.
• Space heating; Heat recovery from ventilation.
• Triple glazed windows; Uvalue no greater than 0.8 w/m2k
• complete airtightness; Air leakage should be less than 1m3/h/m2 @ 50pa
• MVHR units; recovery rate no less than 80%
• Some use of solar gains, thermal mass & renwable energies.

Question 39

What is the order of the Energy Hierarchy

Answer 39

• (1) Reduce the need
• (2) Use energy more efficiently
• (3) Use renewable energy
• (4) fossil fuels should be clean & efficient