Induction to heat and thermal (T4)

Question 1

Climate change act 2006

Answer 1

• Part 1 = carbon target and budgeting for 2050
• Duty of secretary of state to ensure that the net UK carbon account for the year 2050 is at least 80% lower
• Buildings 38%
• Only 20% from production but 80% of gas emissions is from use
• Energy mainly used for space heating (60%)
• Water heating (24%)
• Unstainable

Question 2

What is temperature?

Answer 2

• Measure of the amount of amount of heat stored
• SI unit is kelvin (K)
• Absolute zero is 273.15 K
• ΔT = change in temperature

Question 3

What is heat?

Answer 3

• Heat is energy
• SI unit is Joule (J)
• kWh = 3.3MJ
• specific heat capacity of a material = amount of energy needed to raise 1 kg of that material by 1K
• E = m x Cp x ΔT

Question 4

What is heat transfer?

Answer 4

• Movement of heat
• Watts
• 1W = 1J/S
• Power = energy / time
• Heat moves from high temperature to low temperature (heat loss)
• Rate of heat transfer is proportional to temperature difference

Question 5

rate of conduction heat transfer

Answer 5

Qconduction = λ/d x A x ΔT
λ is the thermal conductivity of the material (W/mK)
d is the thickness of the material (m) 2