You Are Trying to Decide What the Change in Heat $\times$

question 25

Multiple Choice

You are trying to decide what the change in heat loss would be if you put a 100 cm $\times$ 150 cm and 5-mm thick glass window in an outside wall.The thickness of the wall is 15 cm.If the thermal conductivities of the glass and wall are 0.90 W/m·K and 0.15 W/m·K respectively,calculate the difference in heat loss through thermal conductivity with and without the window when the outside temperature is -10 ^$\circ$ C and the inside temperature is 15 ^$\circ$ C.

• A)1.34 \(\times\) 10³ J/s
• B)6.7 \(\times\) 10³ J/s
• C)5.53 \(\times\) 10³ J/s
• D)6.75 \(\times\) 10³ J/s
• E)none of the above

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Definitions:

Net Income

The resultant profit or loss after all expenses and incomes, including tax expenses have been accounted for, over a period.

Straight-line Method

An approach to determining depreciation by consistently allocating the expense of an asset throughout its expected life.

Residual Value

The estimated amount that an asset will be worth at the end of its useful life, often used in accounting for depreciation purposes.

Depreciation Expense

The allocated amount of the cost of a tangible or physical asset over its useful life, reflecting the asset’s consumption, wear and tear, or obsolescence.