Answer:
(a) Final temperature is 151.2 K
(b) Change in the specific internal energy is -30.798 kJ/kg
Explanation:
(a) P1 = P2 = 200 kPa
V1 = 12.322 m^3
V2 = 1/2 × V1 = 1/2 × 12.322 = 6.161 m^3
mass of refrigerant-134a = 100 kg
MW of refrigerant-134a (C2H2F4) = (12×2) + (2×1) + (19×4) = 24 + 2 +76 = 102 g/mol
number of moles of refrigerant-134a (n) = mass/MW = 100/102 = 0.98 kgmol
R = 8.314 kJ/kgmol.K
Final temperature (T2) = P2V2/nR = 200×6.16/0.98×8.314 = 151.2 K
(b) Change in specific internal energy = change in internal energy (∆U)/mass (m)
∆U = Cv(T2 - T1)
Cv = 20.785 kJ/kgmol.K
T1 = P1V1/nR = 200×12.322/0.98×8.314 = 302.4 K
∆U = 20.785(151.2 - 302.4) = 20.785 × -151.2 = -3142.7 kJ/kgmol × 0.98 kgmol = -3079.8 kJ
Change in specific internal energy = -3079.8 kJ/100 kg = -30.798 kJ/kg
Asexual reproduction yields genetically-identical organisms because an individual reproduces without another. In sexual reproduction, the genetic material of two individuals from the same species combines to produce genetically-different offspring; this ensures mixing of the gene pool of the species.
Answer:
Depending on the vehicle, there are typically between two and 12 cylinders in its engine, with a piston moving up and down in each.
Explanation:
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Answer:
well what do you wanna talk about friend?
Explanation:
Answer:
True, <em>Regeneration is the only process where increases the efficiency of a Brayton cycle when working fluid leaving the turbine is hotter than working fluid leaving the compressor</em>.
Option: A
<u>Explanation:
</u>
To increase the efficiency of brayton cycle there are three ways which includes inter-cooling, reheating and regeneration. <em>Regeneration</em> technique <em>is used when a turbine exhaust fluids have higher temperature than the working fluid leaving the compressor of the turbine. </em>
<em>Thermal efficiency</em> of a turbine is increased as <em>the exhaust fluid having higher temperatures are used in heat exchanger where the fluids from the compressor enters and increases the temperature of the fluids leaving the compressor.
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