Heat transfer and Thermal demands

Question 1

Thermal properties of opaque materials

Answer 1

• conductivity
• specific heat
• thickness
• density
• roughness
• thermal absorptance
• solar absorptance
• surface reflectance

Question 2

Features that affect performance of building envelope:

Answer 2

-Orientation
-Geometric proportions
-Thermal transmittance
-Thermal bridges and mass
-Reflectance of exterior materials
-Air leakage

Question 3

Consequences of thermal bridging

Answer 3

Change of heat flow rate
Change in internal surface temperature

Question 4

Thermal bridging impacts

Answer 4

• condensation of vapour and mould development
• deterioration of building elements
• deterioration of internal air quality
• heat/energy loss

Question 5

Rate of heat loss is indicated in terms of the U-value. What are the units?

Answer 5

W/m2K
The U-value is inverse of the R-value

Question 6

What is SHGC?

Answer 6

Solar Heat Gain Coefficient
The fraction of incident solar radiation admitted through a window. Number between 0-1.
The lower the number, the less heat it transmits.
0.4 max is recommended for warm climates.