Question

Calculate the total amount of steam in kg/hr used in the following underlined processes if the steam feed to each vessel is 15 kg/hr @ 140 °C with a steam quality of 95%. Vessel V-01: 600 kg stainless steel vessel, filled with 200 L of water @ 25 °C. Vessel V-02: 1000 kg stainless steel vessel, filled with 100 L of water @ 40 °C Process #1: Vessel V-01 is heated to 50 °C. Process #2: Vessel V-01 temperature is maintained at 50 °C for 1 hour. Assume idealised conditions with no heat loss. Process #3: Once process #2 is complete water is transferred from V-01 to V-02 at a rate of 10 L/min and transferred out of V-02 at the same rate while the tank is now heated from its initial temperature of 40 °C to 65 °C. Specific heat for stainless steel, Cpss = 0.5 kJ/kg.K Specific heat for water, Cpwater = 4.2 kJ/kg.K After process #3 has finished feed valves close and the temperature of V-02 is maintained at 65 °C. An operator inspecting the vessel leaves a hatch on top of the tank open and vapour escapes from the tank at a rate of 0.5 kg/hr. How much steam is required per hour to maintain 65 °C?

          Calculate the total amount of steam in kg/hr used in the following underlined processes if the steam feed to each vessel is 15 kg/hr @ 140 °C with a steam quality of 95%. Vessel V-01: 600 kg stainless steel vessel, filled with 200 L of water @ 25 °C. Vessel V-02: 1000 kg stainless steel vessel, filled with 100 L of water @ 40 °C Process #1: Vessel V-01 is heated to 50 °C. Process #2: Vessel V-01 temperature is maintained at 50 °C for 1 hour. Assume idealised conditions with no heat loss. Process #3: Once process #2 is complete water is transferred from V-01 to V-02 at a rate of 10 L/min and transferred out of V-02 at the same rate while the tank is now heated from its initial temperature of 40 °C to 65 °C. Specific heat for stainless steel, Cpss = 0.5 kJ/kg.K Specific heat for water, Cpwater = 4.2 kJ/kg.K After process #3 has finished feed valves close and the temperature of V-02 is maintained at 65 °C. An operator inspecting the vessel leaves a hatch on top of the tank open and vapour escapes from the tank at a rate of 0.5 kg/hr. How much steam is required per hour to maintain 65 °C?

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