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In the counter flow heat exchange, for the hot fluid the specific heat is 3 kJ/kg K, mass flow rate is 6 kg/s, inlet temperature is 150 °C and outlet temperature is 100 °C. For the cold fluid, the specific heat is 3 kJ/kg K, mass flow rate is 8 kg/s, inlet temperature is 20 °C. Neglecting the heat transfer to surrounding, the outlet temperature of the cold fluid in °C is ________.
  • a)
    7.5
  • b)
    57.5
  • c)
    46.6
  • d)
    60
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In the counter flow heat exchange, for the hot fluid the specific hea...
Given that
Cph = 3 kJ/kg-K = 3000 J/kg K, mh = 6 kg/s
Cpc = 3 kJ/kg K = 3000 J/kg K. , mc = 8 kg/s
Ch = mh x Cph = 6 x 3000 = 18 x 103 J/K
Cc = mc x Cpc = 8 x 3000 = 24 x 103 J/K
Now, Thi = 150°C, The = 100°C, Tci = 20°C
Apply energy conservation principle:
Heat lost by hot fluid = heat lost by cold fluid
Ch (Thi - The) = Cc (Tce - Tci)
18 x 103 (150 - 100) = 24 x 103 (Tce - 20)
Tce = 20 + (150/4)
Tce = 57.5°C
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In the counter flow heat exchange, for the hot fluid the specific heat is 3 kJ/kg K, mass flow rate is 6 kg/s, inlet temperature is 150 °C and outlet temperature is 100 °C. For the cold fluid, the specific heat is 3 kJ/kg K, mass flow rate is 8 kg/s, inlet temperature is 20 °C. Neglecting the heat transfer to surrounding, the outlet temperature of the cold fluid in °C is ________.a)7.5b)57.5c)46.6d)60Correct answer is option 'B'. Can you explain this answer?
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In the counter flow heat exchange, for the hot fluid the specific heat is 3 kJ/kg K, mass flow rate is 6 kg/s, inlet temperature is 150 °C and outlet temperature is 100 °C. For the cold fluid, the specific heat is 3 kJ/kg K, mass flow rate is 8 kg/s, inlet temperature is 20 °C. Neglecting the heat transfer to surrounding, the outlet temperature of the cold fluid in °C is ________.a)7.5b)57.5c)46.6d)60Correct answer is option 'B'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about In the counter flow heat exchange, for the hot fluid the specific heat is 3 kJ/kg K, mass flow rate is 6 kg/s, inlet temperature is 150 °C and outlet temperature is 100 °C. For the cold fluid, the specific heat is 3 kJ/kg K, mass flow rate is 8 kg/s, inlet temperature is 20 °C. Neglecting the heat transfer to surrounding, the outlet temperature of the cold fluid in °C is ________.a)7.5b)57.5c)46.6d)60Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the counter flow heat exchange, for the hot fluid the specific heat is 3 kJ/kg K, mass flow rate is 6 kg/s, inlet temperature is 150 °C and outlet temperature is 100 °C. For the cold fluid, the specific heat is 3 kJ/kg K, mass flow rate is 8 kg/s, inlet temperature is 20 °C. Neglecting the heat transfer to surrounding, the outlet temperature of the cold fluid in °C is ________.a)7.5b)57.5c)46.6d)60Correct answer is option 'B'. Can you explain this answer?.
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