Because a hot water supply must also heat some pipe mass

Chapter 3, Problem 122HP

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QUESTION:

Problem 122HP

Because a hot water supply must also heat some pipe mass as it is turned on, the water does not come out hot right away. Assume 70°C liquid water at 100 kPa is cooled to 45°C as it heats 15 kg of copper pipe from 20 to 45°C. How much mass (kg) of water is needed?

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QUESTION:

Problem 122HP

Because a hot water supply must also heat some pipe mass as it is turned on, the water does not come out hot right away. Assume 70°C liquid water at 100 kPa is cooled to 45°C as it heats 15 kg of copper pipe from 20 to 45°C. How much mass (kg) of water is needed?

ANSWER:

Solution

Step 1 of 3

We need to find out how much mass of water is needed, if  water at  is cooled to  as it heats  of copper pipe from  to .

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