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Question 3 Liquid water at 100 kPa and 25°C is heated in a chamber by mixing it with superheated steam at 100

Question 3 Liquid water at 100 kPa and 25°C is heated in a chamber by mixing it with superheated steam at 100

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Question 3 Liquid water at 100 kPa and 25°C is heated in a chamber by mixing it with superheated steam at 100 kPa and 300°C. Liquid water enters the mixing chamber at a rate of 3.4 kg/s, and the chamber is estimated to lose heat to the surrounding air at 25°C at a rate of 2100 kJ/min. If the mixture leaves the mixing chamber at 100 kPa and 75°C, determine (a) the mass flow rate of the superheated steam, (b) the exergy destruction during this mixing process, (c) the exergy recovered during this mixing process and (d) the second-law efficiency of the mixing chamber. 2100 kJ/min 25°C 3.4 kg/s Mixing chamber → 75°C 100 kPa 300°C → Question 3 key answer hị mi Pi Si Ti X¡ [kJ/kg] [kg/s] [kPa] [kJ/kg-K] [C] 1 104.8 3.4 100 0.367 25 2 3074 0.2577 100 8.215 300 3 314 3.658 100 1.016 75 The mass flow rate of the superheated steam [kg/s] 0.2577 The exergy destruction during this mixing process [kW] The exergy recovered during this mixing process [kW] second-law efficiency of the mixing chamber [%] 104.2 54.17 34.2
Transcribed Image Text:Question 3 Liquid water at 100 kPa and 25°C is heated in a chamber by mixing it with superheated steam at 100 kPa and 300°C. Liquid water enters the mixing chamber at a rate of 3.4 kg/s, and the chamber is estimated to lose heat to the surrounding air at 25°C at a rate of 2100 kJ/min. If the mixture leaves the mixing chamber at 100 kPa and 75°C, determine (a) the mass flow rate of the superheated steam, (b) the exergy destruction during this mixing process, (c) the exergy recovered during this mixing process and (d) the second-law efficiency of the mixing chamber. 2100 kJ/min 25°C 3.4 kg/s Mixing chamber → 75°C 100 kPa 300°C → Question 3 key answer hị mi Pi Si Ti X¡ [kJ/kg] [kg/s] [kPa] [kJ/kg-K] [C] 1 104.8 3.4 100 0.367 25 2 3074 0.2577 100 8.215 300 3 314 3.658 100 1.016 75 The mass flow rate of the superheated steam [kg/s] 0.2577 The exergy destruction during this mixing process [kW] The exergy recovered during this mixing process [kW] second-law efficiency of the mixing chamber [%] 104.2 54.17 34.2
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