CPD PROGRAMME Module 28 May 2011

1. What is the limiting maximum U value for external walls in England and Wales Building Regulations Approved Document Part L1A?

A 0.1 W/m2 B 0.2 W/m2 C 0.3 W/m2 D 0.5 W/m2 E 2.0 W/m2

K

K K K K

2. If a material that is just classified as an insulator has a depth of 50mm, what is its thermal resistance? (This requires a calculation.)

A 0.050m2 B 0.500m2 C 1.000m2 D 10.000m2 E 100.000m2

K/W K/W K/W

K/W K/W

3. What is the normal reference temperature for tabulated values of thermal conductivities of building materials?

A 0°C B 5°C C 10°C D 15°C E 20°C

4. Referring to Figure 2, which of the densities of rock wool (in this example) provides the best thermal insulation?

A 50kg/m3 B 54.4kg/m3 C 71.2kg/m3 D 75.5kg/m3 E 135.6kg/m3

5. What would be the value of the inside surface resistance for a surface of 20°C, where hc is 2.5 W/m2K and the emissivity factor is 0.9? (This requires a calculation.)

A 0.012 m2 B 0.085 m2 C 0.115 m2 D 0.165m2 E 0.215m2

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K/W K/W

K/W K/W K/W

CIBSE Journal May 2011

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