Consider the rock bed thermal storage in 5.60. Use the

Chapter 5, Problem 116HP

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QUESTION: Problem 116HPConsider the rock bed thermal storage in Problem 5.60. Use the specific heat so that you can write dQH in terms of dTrock and find the expression for dW out of the heat engine. Integrate this expression over temperature and find the total heat engine work output.Problem 5.60Thermal storage is made with a rock (granite) bed of 2 m3 that is heated to 400 K using solar energy. A heat engine receives a QH from the bed and rejects heat to the ambient at 290 K. The rock bed therefore cools down, and as it reaches 290 K the process stops. Find the energy the rock bed can give out. What is the heat engine efficiency at the beginning of the process and what is it at the end of the process?

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QUESTION: Problem 116HPConsider the rock bed thermal storage in Problem 5.60. Use the specific heat so that you can write dQH in terms of dTrock and find the expression for dW out of the heat engine. Integrate this expression over temperature and find the total heat engine work output.Problem 5.60Thermal storage is made with a rock (granite) bed of 2 m3 that is heated to 400 K using solar energy. A heat engine receives a QH from the bed and rejects heat to the ambient at 290 K. The rock bed therefore cools down, and as it reaches 290 K the process stops. Find the energy the rock bed can give out. What is the heat engine efficiency at the beginning of the process and what is it at the end of the process?

ANSWER:

Solution 116 HP

Step 1 of 5

To find the expression for change in work done for heat engine. And also by integrating the expression we need to find the total work output of the heat engine.

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