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Terms in this set (82)Sets found in the same folderVerified questionsengineering Consider a horizontal, thin-walled circular tube of diameter D=0.025 m submerged in a container of n-octadecane (paraffin), which is used to store thermal energy. As hot water flows through the tube, heat is transferred to the paraffin, converting it from the solid to liquid state at the phase change temperature of $T_{\infty}=27.4^{\circ} \mathrm{C}$. The latent heat of fusion and density of paraffin are $h_{s f}=244 \mathrm{kJ} / \mathrm{kg}$ and $\rho=770 \mathrm{kg} / \mathrm{m}^{3}$, respectively, and thermophysical properties of the water may be taken as $c_{p}=4.185 \mathrm{kJ} / \mathrm{kg} \cdot \mathrm{K}, k=0.653 \mathrm{W} / \mathrm{m} \cdot \mathrm{K}$, $\mu=467 \times 10^{-6} \mathrm{kg} / \mathrm{s} \cdot \mathrm{m}$, and Pr=2.99. (a) Assuming the tube surface to have a uniform temperature corresponding to that of the phase change, determine the water outlet temperature and total heat transfer rate for a water flow rate of 0.1 kg/s and an inlet temperature of $60^{\circ} \mathrm{C}$. If H=W=0.25 m, how long would it take to completely liquefy the paraffin, from an initial state for which all the paraffin is solid and at $27.4^{\circ} \mathrm{C} ?$ (b) The liquefaction process can be accelerated by increasing the flow rate of the water. Compute and plot the heat rate and outlet temperature as a function of flow rate for $0.1 \leq m \leq 0.5 \mathrm{kg} / \mathrm{s}$. How long would it take to melt the paraffin for m=0.5 kg/s? Verified answer engineering Verified answer engineering Verified answer
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Other Quizlet setsWhich NFPA standard addresses competencies for hazardous materials WMD Responders group of answer choices?NFPA 472: Standard for Competence of Responders to Hazardous Materials/Weapons of Mass Destruction Incidents.
Which NFPA standard addresses competencies for emergency medical personnel working a hazardous materials WMD incident?NFPA 473: Standard for Competencies for EMS Personnel Responding to Hazardous Materials/Weapons of Mass Destruction Incidents.
What is the NFPA Standard for Competence of Responders to hazardous materials weapons?NFPA 473, Standard for Competencies for EMS Personnel Responding to Hazardous Materials/Weapons of Mass Destruction Incidents. NFPA 475, Recommended Practice for Organizing, Managing, and Sustaining a Hazardous Materials/Weapons of Mass Destruction Response Program.
Which consensusWhich consensus-based standard describes the hazardous materials training competencies for operations level responders? NFPA 472 expands the scope of an operations level responder by separating the operations level competencies into two distinct categories.
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Which nfpa standard addresses competencies for hazardous materials/wmd responders quizlet
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