0 ºC.   Required: Draw a standard and clear schematic of the problem and label the performance data on the schematic. Perform step by step energy and mass analyses, state your assumptions and determine the mass flow rate of the hot stream required.

Nitrogen flows into a throttling valve with a volume flow rate of 2 cm3/min at 250 bar and 250 K. The nitrogentemperature after throttling is 240 K. Determine the mass flow rate of nitrogen and the pressure after throttling. Inclue pv and ts diagrams.

D Question 1 Use this figure for Questions 1 to 5. A hot-water stream at 90 °℃ enters an insulated mixing chamber with a mass flow rate of mh=0.75 kg/s where it is mixed with a stream of cold water at 25°℃ in a steady state steady flow process. It is desired that the mixture leaves the chamber at 45°℃ as shown in the Figure Hot water P₁=300 kPa T₁=90°C m=0.75 kg/s Cold water P-300 kPa T: 25% m=? 1 2 Mixing Chamber Mixed warm water Ps-300 kPa T=45°C m3 For Question 1: The specific enthalpy of the hot water, h1, in kJ/kg is