U-Values (Leaving Cert Construction Studies): Quizzes

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U-Values
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What does a U-value measure in building construction?

Heat transfer rate through materials

In the U-value unit W/m²K, what does 'K' represent?

Kelvin (temperature difference)

What is the maximum U-value for walls under current (2011) Irish building regulations?

0.21 W/m²K

What does a lower U-value indicate about a building element?

Better insulation performance

How long is a BER certificate valid unless significant changes occur to the building?

Ten years

What is the formula for calculating U-value from total thermal resistance?

U=1RTU = \frac{1}{R_T}

What formula calculates the resistance (RR) of a material layer?

R=TkR = \frac{T}{k}

What is the most effective method for reducing U-values in walls?

Cavity construction with insulation

Which temperature scale is used for U-value calculations?

Kelvin

For two heat paths, what formula gives total resistance (RTR_T)?

RT=RU+RL2R_T = \frac{R_U + R_L}{2}

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