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25 Cards in this Set
- Front
- Back
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Density
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Mass of a substance per unit volume.
Unit: lbm/ft3 |
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enthalpy
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Sum of the internal energy and flow energy of a substance.
Unit: BTU/lbm |
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Heat
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Energy in transition; energy that flows from one location to another because a temp difference exists between those locations.
Unit: BTU |
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Heat of fusion
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Heat required at melting temp to change one pound mass of a solid into liquid form.
Unit: BTU/lbm |
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Heat of Vaporization
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Heat required at vaporization temp to change one pound mass of a liquid into gaseous form.
Unit: BTU/lbm |
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Internal Energy (u)
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Energy possessed by a substance due to the random motion of the individual molecules of a substance.
Unit: BTU/lbm |
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Fluid
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Any substance that conforms to the shape of its container
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British Thermal Unit (BTU)
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Amount of heat required to increase the temp of one pound mass of water by 1f under standard temp and pressure conditions
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Latent Heat
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Heat added to or removed from a substance that produces a change in the phase of the substance (but no change in temp).
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Moisture Fraction
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The fraction of the total mass of a water/steam mixture that is liquid water.
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Phase
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The condition of a substance as defined by its fluidity.
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Process
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Series of state changes that occur when the properties of a system change.
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Quality (x)
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the fraction of the total mass of a water/steam mixture that is steam.
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Saturated (Dry) Steam
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100% steam at saturation temp/saturation pressure conditions.
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Saturated Liquid Water
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100% liquid water at saturation temp/saturation pressure conditions.
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Sensible Heat
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Heat added to or removed from a substance that produces a change in its temperature (but no change in phase).
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Specific Heat Capacity (cp)
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Heat required to raise the temp of one pund mass of a material by 1F.
Unit: BTU/lbmF |
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Specific Volume (v)
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Volume occupied per unit mass of a substance.
Unit: ft3/lbm |
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State
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A particular condition of a substance described by the (unique) values of its thermodynamic properties.
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Subcooled Liquid Water
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Water that exists at a temperature below aturation temp for the pressure of the water, or, equivalently, exists at a pressure above sat pressure fo the temp of the water
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Subcooling Margin (SCM)
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The difference between the saturation temp and the actual temp of subcooled water;
SCM = Tsat - Tactual |
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Superheated Steam
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Steam existing at a temp above sat temp for the pressure of the steam.
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Temperature (T)
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A measure of the average kinetic energy of the molecules of a substance.
Unit: F, R, C, K |
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Wet Steam
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A mixture of liquid water and steam, both at sat temp/pressure conditions.
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Working Fluid
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Any fluid which receives, transports and transfers energy in a fluid flow system.
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