Chapter 6: Problem 10
Investigate the operation of various turbines. Write a brief report explaining the operation of steam turbines, hydraulic turbines, gas turbines, and wind turbines.
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Chapter 6: Problem 10
Investigate the operation of various turbines. Write a brief report explaining the operation of steam turbines, hydraulic turbines, gas turbines, and wind turbines.
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For Problem \(6.49, b_{\text {Loss }}\) is expressed in feet, \(L\) and \(D\) in inches, \(V\) in ( \(\mathrm{ft} / \mathrm{s}\) ), and \(g\) in (ft/s \(^{2}\) ). What is the appropriate unit for the friction factor \(f\) ?
A machine shop has a rectangular floor shape wit dimensions of \(30 \mathrm{ft}\) by \(50 \mathrm{ft}\). Express the area of the flo in \(\mathrm{ft}^{2}, \mathrm{~m}^{2}\), in \(^{2}\), and \(\mathrm{cm}^{2}\). Show the conversion steps.
Start with \(1 \mathrm{lb}_{f} \cdot \mathrm{ft} / \mathrm{s}\) and convert it to \(\mathrm{N} \cdot \mathrm{m} / \mathrm{s}\) and show that \(1 \mathrm{lb}_{\mathrm{f}} \cdot \mathrm{ft} / \mathrm{s}\) is equal to \(1.36\) watts. Knowing that \(550 \mathrm{lb}_{\mathrm{f}} \cdot \mathrm{ft} / \mathrm{s}\) is equal to 1 horsepower, how many kilowatts is that?
For gases under certain conditions, there is a rela ship between the pressure of the gas, its volume, a temperature as given by what is commonly called the ideal gas law. The ideal gas law is given by $$ P V=m R T $$ where \(P=\) absolute pressure of the gas, \(\mathrm{Pa}\) \(V=\) volume of the gas, \(\mathrm{m}^{3}\) \(m=\) mass, \(\mathrm{kg}\) \(R=\) gas constant \(T=\) absolute temperature, Kelvin What is the appropriate unit for \(R\), if the above equation is to be homogeneous in units?
In an annealing process-a process wherein materials such as glass and metal are heated to high temperatures and then cooled slowly to toughen them - the following equation may be used to determine the temperature of a thin piece of material after some time \(t\). $$ \frac{T-T_{\text {eavironment }}}{T_{\text {initial }}-T_{\text {environment }}}=\exp \left(-\frac{2 b}{\rho c L} t\right) $$ where $$ \begin{aligned} T &=\text { temperature }\left({ }^{\circ} \mathrm{C}\right) \\ b &=\text { heat transfer coefficient } \\ \rho &=\text { density }\left(\mathrm{kg} / \mathrm{m}^{3}\right) \end{aligned} $$ Those of you who will pursue aerospace, chemical, mechanical, or materials engineering will learn about the underlying concepts that lead to the solution in your heat-transfer class. What is the appropriate unit for h if the preceding equation is to be homogeneous in units? Show all steps of your work.
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