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Class Notes for Meteorology at Pennsylvania State University

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METEO 300 Lecture Notes - Lecture 30: Steam Turbine, Rankine Cycle, Thermal Efficiency
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ME 300 - Lecture 30 - Cycles: Steam Power Plant Review of the Rankine Cycle (Steam Power Plant) Processes: 1-2: Water pump: 12= (21) 2-3: Boiler: 23= (32) 3-4: Steam turbine: 34= (34) 4-1: Condenser: 41= (41) Efficiency ...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 34: Brayton Cycle, Combustor, Isentropic Process
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ME 300 - Lecture 34 - Ideal Gas Cycles Continued What is the Brayton Cycle? 1-2: Compressor increase air pressure 2-3: Combustor inject and combust fuel 3-4: Turbine provide output and compressor power 4-1: E...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 31: Superheating, Carnot Cycle, Isentropic Process
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ME 300 - Lecture 31 - Cycles: Vapor-Compression Cycle (Refrigerator) What is the vapor-compression cycle? Vapor-compression cycle: the reversed Carnot cycle for real gases. , = Processes: 1-2: Isentropic compression...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 33: Propulsive Efficiency, Combustor, Conservation Of Mass
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ME 300 - Lecture 33 - Ideal Gas Cycles Continued What processes do Turbojet Engines undergo? 1-2: Diffuser slows air velocity, increases pressure 2-3: Compressor increases air pressure. 3-4: Combustor injects hea...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 32: Isochoric Process, Isentropic Process, Thermal Efficiency
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ME 300 - Lecture 32 - Ideal Gas Cycles What is the Otto Cycle? Otto cycle: intake, compression, expansion, exhaust (internal combustion engine) Assumptions we make: fuel/air mixture is replaced with dry (ideal) gas ...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 23: Thermal Efficiency, Thermodynamic Cycle, Thermodynamics
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ME 300 - Lecture 23 - Second Law of Thermodynamics Continued What is a heat reservoir? Heat reservoir: a source of heat so large that the extraction of any desire amount of heat does not change the temperature of the res...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 27: Polytropic Process, Isentropic Process, Thermodynamic Process
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ME 300 - Lecture 27 - Isentropic Relations for Ideal Gases What do the isentropic relations look like on P-v and T-s diagrams? Isentropic expansion Isentropic compression What is a polytropic process? ...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 24: Isentropic Process, Irreversible Process
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ME 300 - Lecture 24 - Reversible (Carnot) Cycle What is a reversible (Carnot) cycle? Reversible process: one in which the system and all parts of its surroundings can be restored to their initial states. *Real processes ar...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 17: Ideal Gas Law, Os T1000, Specific Volume
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ME 300 - Lecture 17 - Energy Conservation for a System Continued More Examples of Cycle Analysis Example: A simple engine uses an ideal gas as the working fluid in a piston-cylinder system. The gas is heated at constant ...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 29: Isentropic Process, Air Mass
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ME 300 - Lecture 29 - Isentropic Efficiency Continued Another Example of Isentropic Efficiency Example: A compressor compresses air (ideal) from P1 = 0.65 atm to P2 = 24 x P1. The temperature of air at the inlet is T1 = ...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 28: Isentropic Process, Superheating
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ME 300 - Lecture 28 - Isentropic Efficiency What is isentropic efficiency? Efficiency of a process: the amount of work that can be converted to heat. *This is optimized when the process is isentropic (adiabatic and rever...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 26: Ideal Gas, Isochoric Process, Isobaric Process
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ME 300 - Lecture 26 - Entropy Relations for Ideal Gases What assumptions do we make when solving reversible cycles? Ideal gas ( = ) Non-ideal substance (Tables) Mass-specific (intensive) properties Reversible proc...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture 21: ME 300_Lecture 21
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ME 300 - Lecture 21 - Ideal Versus Non-Ideal Devices How does power output between ideal and non-ideal devices compare? Compressor: Energy conservation: = > *Power consumed by a non-ideal compressor...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 22: Spontaneous Process, Thermodynamics
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ME 300 - Lecture 22 - Second Law of Thermodynamics What is entropy? Entropy: a measure of the randomness of atoms. How do the entropies of the three phases of water compare? Ice: highly organized, low entropy. Liquid...

Meteorology
METEO 300
Xuan Yuan
METEO 300 Lecture Notes - Lecture 25: Adiabatic Process, Carnot Cycle, Thermal Efficiency
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ME 300 - Lecture 25 - Reversible (Carnot) Cycle Continued What is an Irreversible cycle? Irreversible: addition of friction to expansion/compression or any other irreversibility. *The system does not return to its initi...

Meteorology
METEO 300
Xuan Yuan

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