The Amount of Sunshine Illuminating a Wall of a Building

question 93

Multiple Choice

The amount of sunshine illuminating a wall of a building can greatly affect the energy efficiency of the building. The solar radiation striking a vertical wall that faces east is given by the formula where R ₀ is the maximum solar radiation possible, is the angle that the sun makes with the horizontal, and is the direction of the sun in the sky, with = 90 ^o when the sun is in the east and = 0 ^o when the sun is in the south. What percentage of R ₀ is striking the wall when is equal to 60 ^o and the sun is in the southeast?
Round the answer to the nearest integer.

• A)35 %
• B)30 %
• C)20 %
• D)45 %
• E)59 %

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Definitions:

Asset Revaluation Surplus

The increase in value of an asset, reflected on a company's financial statements, after it has been revalued to its current market value.

General Reserve

Funds set aside by a company from its profits for general unspecified future risks or obligations.

Amortisation of Goodwill

The gradual write-off of the purchased goodwill of a company over time, reflected as a non-cash expense in the income statement.

Associate's Profit

The portion of profits attributable to a company's investment in an associate, typically accounted for using the equity method.