1/13/23, 2:09 PM Queston 13 Not yet answered Marked out of 5 MENG420L-Fall 2022-2023 Final Exam slot 1 From the following collected data and using the tables below, Cp of hot water is equal to m (g/s) cold 15 That (°C) Tcold (°C) hot 15 T1 60.1 T₂ T3 T4 50.7 23.9 29.5 Specific Heat capacity Cp of Water in kJ/kg.K °C 1 2 3 4 5 6 7 8 0 4.1274 4.2138 4.2104 4.2074 10 4.1919 4.1904 4.1890 4.1877 20 4.1816 4.1810 4.1805 4.1801 30 4.1782 4.1781 4.1780 4.1780 40 4.1783 4.1784 4.1786 4.1788 50 4.1804 4.1807 4.1811 4.1814 60 4.1841 4.1846 4.1850 4.1855 70 4.1893 4.1899 4.1905 4.1912 4.2054 4.2019 4.1996 4.1974 4.1954 4.1936 4.1866 4.1855 4.1864 4.1837 4.1829 4.1822 4.1797 4.1793 4.1790 4.1787 4.1785 4.1783 4.1779 4.1779 4.1780 4.1780 4.1781 4.1782 4.1789 4.1792 4.1794 4.1796 4.1799 4.1800 4.1817 4.1821 4.1825 4.1829 4.1833 4.1837 4.1860 4.1865 4.1871 4.1876 4.1882 4.1887 4.1918 4.1925 4.1932 4.1939 4.1964 4.1954 Select one: Oa 4.18415 kJ/kg.< Ob. 4.18226 kJ/kg.K c. 418229 kJ/kg.< Od 417879 kl/kg.K O

1/13/23, 2:09 PM Queston 13 Not yet answered Marked out of 5 MENG420L-Fall 2022-2023 Final Exam slot 1 From the following collected data and using the tables below, Cp of hot water is equal to m (g/s) cold 15 That (°C) Tcold (°C) hot 15 T1 60.1 T₂ T3 T4 50.7 23.9 29.5 Specific Heat capacity Cp of Water in kJ/kg.K °C 1 2 3 4 5 6 7 8 0 4.1274 4.2138 4.2104 4.2074 10 4.1919 4.1904 4.1890 4.1877 20 4.1816 4.1810 4.1805 4.1801 30 4.1782 4.1781 4.1780 4.1780 40 4.1783 4.1784 4.1786 4.1788 50 4.1804 4.1807 4.1811 4.1814 60 4.1841 4.1846 4.1850 4.1855 70 4.1893 4.1899 4.1905 4.1912 4.2054 4.2019 4.1996 4.1974 4.1954 4.1936 4.1866 4.1855 4.1864 4.1837 4.1829 4.1822 4.1797 4.1793 4.1790 4.1787 4.1785 4.1783 4.1779 4.1779 4.1780 4.1780 4.1781 4.1782 4.1789 4.1792 4.1794 4.1796 4.1799 4.1800 4.1817 4.1821 4.1825 4.1829 4.1833 4.1837 4.1860 4.1865 4.1871 4.1876 4.1882 4.1887 4.1918 4.1925 4.1932 4.1939 4.1964 4.1954 Select one: Oa 4.18415 kJ/kg.< Ob. 4.18226 kJ/kg.K c. 418229 kJ/kg.< Od 417879 kl/kg.K O

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.22P: 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas...

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1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35 W/m K is and the air temperature is . Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about (see Table 1.4), but in a 40-mph wind it increases to . (a) If frostbite occurs when the skin temperature drops to about , do you advise the skier to wear a face mask? (b) What is the skin temperature drop due to the wind?
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