Thermodynamic possiblity for outlet temperatures of heat exchanger

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SUMMARY

The discussion centers on the thermodynamic feasibility of a shell and tube heat exchanger recovering heat from hot exhaust gas. The inlet exhaust gas temperature is 120°C, and the outlet is 40°C, while the inlet water temperature is 35°C and the outlet is 50°C. It is confirmed that achieving these outlet temperatures is thermodynamically possible if the heat exchanger operates as a countercurrent heat exchanger, allowing for efficient heat transfer between the two fluids.

PREREQUISITES
  • Understanding of heat exchanger types, specifically shell and tube heat exchangers.
  • Knowledge of thermodynamic principles related to heat transfer.
  • Familiarity with temperature gradients and their impact on heat exchange efficiency.
  • Basic concepts of countercurrent versus concurrent flow in heat exchangers.
NEXT STEPS
  • Research the design and operational principles of shell and tube heat exchangers.
  • Learn about the thermodynamic calculations for heat exchangers, including heat balance equations.
  • Study the advantages of countercurrent flow in heat exchangers compared to concurrent flow.
  • Explore software tools for simulating heat exchanger performance, such as HTRI or Aspen HYSYS.
USEFUL FOR

Engineers, thermal system designers, and students studying thermodynamics or heat transfer who are involved in designing or analyzing heat exchangers.

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TL;DR
Temperatures of exhaust gas and water at heat-exchanger outlet
I have a heat & mass balance diagram wherein there is a shell and tube heat exchanger to recover heat from hot exhaust gas using cold water. The exhaust gas inlet temperature is 120°C and the outlet is at 40°C. The inlet water temperature is 35°C while the outlet water temperature is at 50°C.

I wish to know, that whether an exhaust outlet of 40°C and water outlet of 50°C is thermodynamically possible?

Kindly provide reasons also.
 
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