Hi
I'd like to find the mean heat value of entalpy change in combustor. It is going about the equation:
qks=cp_mean*(Tt4-Tt3)=F*f*efic_c
where:
cp_mean - looking for mean heat value
Tt4, Tt3 - total temperature in combustor outlet and inlet
F- fuel heat walue
f - fuel/air ratio
efic_c - combustor efficiency.
In polish literature I found the relation
cp_mean= 908,9+0,2095 *(Tt4+0,48*Tt3)
I used this formula, but the results are to high in my opinion. For example for Tt3=1000K, Tt4=1800K, cp_mean=1387 J/kg/K
Who can propose something else to calculate cp_mean, or confirm that presnted formula is valid?
The starting point of thermodynamic logic is: 1) opposing perpetual motion. 2) The irreversibility of dynamics. Let's look at how to get Carnot efficiency = 1-T1/T2.
1.1 There are many kinds of type 2 perpetual motors, each of which is a natural phenomenon.
A) Machine A: against the irreversibility of thermodynamics (diffusion, heat conduction, friction, etc) - dynamics;
B) Machine B: Utilizing the Difference of Carnot Efficiency (Reversible Thermodynamics) - Thermodynamics
1.2 A and B belong to different disciplines. There is a parallel relationship between them and there is no logical mutual inevitability.
1.3. Logic of the Second Law of Thermodynamics:
Experience induction, deny that A machine==> B machine can not be manufactured==> All material Kano efficiency: 1-T1/T2.
1.4 The logic of the second law of thermodynamics violates the physical logic that A and B cannot be inferred from each other.
1.5 The second law of thermodynamics elevates the "irreversibility", which is in fact only a kinetic experience.
📷 Detailed discussion can be found in the following figure.
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