DB325: Lesson 3 - Principles of Heat Transfer and Conduction SAQ: Suggested Response - Q4

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This lesson allows you to test yourself on the material covered in the lesson on Principals of Heat Transfer and Conduction, and to determine the level to which you have met the learning outcomes.

Suggested Response - Q4

** How much thermal energy is released when 3,000 kg steam is condensed? The heat of vaporisation of water is 2,257 kJ kg^-1.

Response:

First, we need to decide if this is sensible or latent heat. Since this is a phase change, we know we are calculating the latent heat. We can then recall the following formula:

$Q space equals space M capital delta H subscript v a p end subscript$

To use this equation, we need the mass of the water that was vaporised and the heat of vaporisation of water.

These values were given in the problem statement, so we are now ready to enter our values into the equation and calculate.

$Q space equals space M space cross times space capital delta H subscript v a p end subscript$

$Q space equals space 3 comma 000 space cross times space 2257 space space equals space 6 comma 771 comma 000 space k J space equals space 6 comma 771 space M J$

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Lesson 3 - Principles of Heat Transfer and Conduction SAQ

Suggested Response - Q4

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