4. The Linde liquefaction process described in Example 4.3c in Lecture 4 is shown in Figure Q4. Show that the enthalpy of methane at point 3' (the point after the heat exchanger and before the throttling valve) can be found by establishing an energy balance either around the Heat exchanger or around the Throttling valve. You may use the "Pressure-Enthalpy (PH) diagram for methane" provided on page 10. [30] Figure Q4 Pressure-enthalpy diagram for methane 4. The Linde liquefaction process described in Example 4.3c in Lecture 4 is shown in Figure Q4. Show that the enthalpy of methane at point 3' (the point after the heat exchanger and before the throttling valve) can be found by establishing an energy balance either around the Heat exchanger or around the Throttling valve. You may use the "Pressure-Enthalpy (PH) diagram for methane" provided on page 10. [30] Figure Q4 Pressure-enthalpy diagram for methane