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The equation of effectiveness ε = 1 − e−NTU of a heat exchanger is valid(NTU is number or transfer units) in the case of: 
  • a)
    Boiler and condenser for parallel flow
  • b)
    Boiler and condenser for counter flow
  • c)
    Boiler and condenser for both parallel flow and counter flow
  • d)
    Gas turbine for both parallel flow and counter flow
Correct answer is option 'C'. Can you explain this answer?
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The equation of effectiveness ε = 1 − e−NTU of a heat...
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The equation of effectiveness ε = 1 − e−NTU of a heat...
Explanation:

Boiler and Condenser for Parallel Flow:
- In a parallel flow heat exchanger, the hot and cold fluids flow in the same direction.
- The equation of effectiveness = 1 - e^(-NTU) is valid for a parallel flow heat exchanger.

Boiler and Condenser for Counter Flow:
- In a counter flow heat exchanger, the hot and cold fluids flow in opposite directions.
- The equation of effectiveness = 1 - e^(-NTU) is also valid for a counter flow heat exchanger.

Boiler and Condenser for Both Parallel Flow and Counter Flow:
- The equation of effectiveness = 1 - e^(-NTU) is valid for both parallel flow and counter flow heat exchangers.
- This equation is a general expression that can be used for different flow configurations.

Gas Turbine for Both Parallel Flow and Counter Flow:
- The equation of effectiveness = 1 - e^(-NTU) is specifically applicable to heat exchangers like boilers and condensers.
- For gas turbines, a different set of equations and considerations would be needed for performance analysis.
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The equation of effectiveness ε = 1 − e−NTU of a heat exchanger is valid(NTU is number or transfer units) in the case of:a)Boiler and condenser for parallel flowb)Boiler and condenser for counter flowc)Boiler and condenser for both parallel flow and counter flowd)Gas turbine for both parallel flow and counter flowCorrect answer is option 'C'. Can you explain this answer?
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