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30 Cards in this Set
- Front
- Back
Saturated Liquid
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A liquid that has absorbed as much heat energy as it can without vaporizing it
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Subcooled Liquid
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If a liquid is not saturated, it is subcooled
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Liquid vapor mixture
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a liquid vapor of the same substance can coexist at the same temperature
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Saturated Vapor
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a vapor about to be condensed
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Superheated vapor
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A superheated vapor is one that has absorbed more energy than is needed merely to vaporize it
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Volume =
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Volume = MW specific volume
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Enthalpy Equation
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h = hf + xhg
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An Ideal Gas has
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High Temperatures and Low Pressures
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A liquid boils when its vapor pressure is equal to
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ambient pressure
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What is the change in specific entropy?
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∆s = H/T where T is in Kelvin
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Adiabatic Process
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No energy crosses the system boundary
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Isentropic Process
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Adiabatic process where there is no entropy production
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Throttling Process
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Adiabatic process where there is no entropy change but pressure drop
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Constant Pressure Process
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isobaric process
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constant temperature process
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isothermal process
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constant volume process
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isochoric process
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First Law of Thermodynamics
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Q = ∆U + W
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What is the efficiency of a pump?
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n = W ideal / W act
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What type of process is this used for?
P2/P1 = (V1/V2)^k |
Isentropic
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What type of process is this used for?
W = -V (P2-P1) |
Incompressible Fluid
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What type of process is this used for?
P2/P1 = V1/V2 |
Ideal gas with const. temp
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What type of process is this used for?
P1/T1 = P2/T2 |
Const. Volume
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A Rankine cycle consists of
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2 constant pressure and 2 isentropic process
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Combustion portion of cycle
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the vertical part
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Absolute pressure
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101 kPa
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Dalton's Law
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The total pressure of a gas mixture is the sum of the individual gases's partial pressures
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How can relative humidity of an air sample be determined?
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Measure the wet bulb and dry bulb temperatures and look up the corresponding relative humidity on a psychrometric chart
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When to use Gibbs Rule?
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How many phases
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Rate of Heat Transfer
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Q(dot) = m h / t
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How to get Q watts into joules?
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Q = Q(dot) * t
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