Thermal Performance

Question 1

What can pass through the green house gas layer which heats the Earth surface?

Answer 1

Short wave radiation.

Question 2

What is absorbed by green house gasses or re-radiated back to the Earth’s surface?

Answer 2

Long wave radiation.

Question 3

What happens when long wave radiation is absorbed by green house gasses?

Answer 3

More heat is retained which heats up the atmosphere.

Question 4

What does the UK Government aim to do by 2050 about emissions?

Answer 4

Reduce emissions by at least 80% of 1990 levels.

Question 5

What percentage is required yearly in order to achieve the reduction of 80% emissions by 2050?

Answer 5

3%

Question 6

At what percentage were the emissions in the year 2017?

Answer 6

43%

Question 7

What is the total energy use in the UK for services?

Answer 7

16%

Question 8

What is the total use of energy in the UK for industry?

Answer 8

16%

Question 9

What is the total use of energy in the UK for transport

Answer 9

40%

Question 10

What is the total energy use in the UK for domestic?

Answer 10

28%

Question 11

Where do building heat losses occur?

Answer 11

Roof - 22%
Windows - 26% 
Walls - 6%
Floor - 8%
Ventilation and air infiltration - 35%

Question 12

Where does heat loss occur?

Answer 12

In buildings where there is a temperature difference between the inside and the outside of the building.

Question 13

What 3 things does the amount of heat loss depend on?

Answer 13

The conductivity of the component.
The area of the component.
The temperature difference across the component.

Question 14

What does thermal insulation provide resistance to?

Answer 14

The passage of heat.

Question 15

What does the level of resistance depend on?

Answer 15

The type of insulation.

Question 16

What does thermal insulation do?

Answer 16

Maintains stable temperature to improve thermal comfort.

Reduces energy use.

Question 17

What is Thermal Bridging?

Answer 17

It is an area of a building construction which has a significantly higher heat transfer than the surrounding materials.

Question 18

Where is thermal bridging mostly typical?

Answer 18

Where there is either a break in the insulation.

Less insulation or the insulation has been penetrated by an element with higher thermal conductivity.

Question 19

What is the units of measurement for calculating thermal performance?

Answer 19

W/m²K

Question 20

What does the K stand for in the W/m²K measurment?

Answer 20

Kelvin, unison measuring a temperature

It is same as degrees C

Question 21

If a structure is insulated well, is the U Value higher or lower?

Answer 21

Lower.

Question 22

What type of heat transfer is from one heat substance to another due to direct contact?

Answer 22

Conduction

Question 23

What does Kelvin measure?

Answer 23

Temperature

Question 24

Heat will naturally travel from a colder to a hotter object, true or false?

Answer 24

False

Question 25

Which U-value is better 0.25 or 0.35

Answer 25

0.25