clear answer In a biomass processing plant, an engineer plans to use a cross-flow heat exchanger to recover heat form hot air to pre-heat water as in Figure 5a. The total surface area is about 10 m² while its overall heat transfer coefficient is 0.2116 W/m².°C The hot air flows into the heat exchanger at a temperature of 100°C, 0.92 kg/s to pre-heat water which enters at 30°C with a flow rate of 0.42 kg/s. If the specific heats of hot air and water can be taken as Cp,air= 1.01 kJ/kg°C and Cp,water = 4.18 kJ/kg°C respectively, determine: i) ii) iii) iv) the effectiveness of the heat exchanger; the heat exchange rate between hot air and water; the outlet temperatures of bot hot air and water; and state two (2) parameters that you adjust to increase the heat transfer rate without changing the heat exchanger's design. Air flow (unmixed) O Water flow (unmixed)
clear answer In a biomass processing plant, an engineer plans to use a cross-flow heat exchanger to recover heat form hot air to pre-heat water as in Figure 5a. The total surface area is about 10 m² while its overall heat transfer coefficient is 0.2116 W/m².°C The hot air flows into the heat exchanger at a temperature of 100°C, 0.92 kg/s to pre-heat water which enters at 30°C with a flow rate of 0.42 kg/s. If the specific heats of hot air and water can be taken as Cp,air= 1.01 kJ/kg°C and Cp,water = 4.18 kJ/kg°C respectively, determine: i) ii) iii) iv) the effectiveness of the heat exchanger; the heat exchange rate between hot air and water; the outlet temperatures of bot hot air and water; and state two (2) parameters that you adjust to increase the heat transfer rate without changing the heat exchanger's design. Air flow (unmixed) O Water flow (unmixed)
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.
Chapter10: Heat Exchangers
Section: Chapter Questions
Problem 10.40P
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Transcribed Image Text:clear answer
In a biomass processing plant, an engineer plans to use a cross-flow heat
exchanger to recover heat form hot air to pre-heat water as in Figure 5a. The
total surface area is about 10 m² while its overall heat transfer coefficient is
0.2116 W/m².°C The hot air flows into the heat exchanger at a temperature of
100°C, 0.92 kg/s to pre-heat water which enters at 30°C with a flow rate of
0.42 kg/s. If the specific heats of hot air and water can be taken as Cp,air= 1.01
kJ/kg°C and Cp,water = 4.18 kJ/kg°C respectively, determine:
i)
ii)
iii)
iv)
the effectiveness of the heat exchanger;
the heat exchange rate between hot air and water;
the outlet temperatures of bot hot air and water; and
state two (2) parameters that you adjust to increase the heat transfer rate
without changing the heat exchanger's design.
Air flow
(unmixed)
00
оо
Water flow
(unmixed)
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