# thermo

 thermodynamics how a hot body can perform work classical thermo vs statistical classical - more direct, less math complicationsstatistical - Laser, plasma, high-speed gas flowchem. kinetics, cryogenics derivation ideal gas spec. heat system whatever we want to study. Surroundings everything external to thesystem. Boundary distinguishes system from itssurroundings. closed system constant matter Isolated system special typeof closed system that doesnot interact in any way with itssurroundings. Control Volume/open system Mass may cross the boundry Extensive Property mass, volume, energy Intensive property temperature, pressure, spec. volume State Systems condition, described by it's properties process  Change of state, Change of atleast one property Cycle Sequence of processes that begins and ends with same state non-properties mass flow and energy transfer, because takes two states to know the change. Steady state Properties do not change with time. equilibrium isolated system when properties stop changing Phase Homogenous chemical and structural matter Specific volume 1/p = kg/m^3 Pressure Force/Area pressure unit 1pa = 1N/m2 bar conversion 1bar = 10^5N/m2 Absolute pressure P = Pguage + Patm Vacume pressure Pvac = Patm - P Kelvin celsius ralationship T(C) = T(K) - 273 First law of thermo Energy is conservedΔE = ΔPE+ΔKE+ΔUΔE = Q - W Work sign standard Into system is negout of system is pos Heat sign standard Heat out is negHeat in is pos Work Equation W = ∫ pdV = ∫Fdx = ∫ pAdx polytropic process pVn = constant Heat transfer types Convection - through a mediumRadiation - energy waves Conduction - direct touching transfer Rerfrigeration cycle provide cooling Wcycle = Qout-QinB=Qin/Wcycle = Qin/(Qout-Qin) Power cycle Wcycle =Qin - Qoutn = Wcycle/Qin = (Qin-Qout)/Qin Heat Pump Cycle Wcycle = Qout - Qiny = Qout/Wcycle = Qout/(Qout - Qin) Vapor Dome  Dome shaped region of the Two-phase liquid-vapor states Critical Point the Max of the vapor domeMax temp and pressure the two phase can coexist Quality X = mvapor/(mvapor+mliquid) Enthalpy(h) h = uspecific + pvspecific .415% dW/dT = .2KwT = ~92.5sec AuthorAnonymous ID174595 Card Setthermo Descriptiontest 1 Updated2012-10-01T02:26:41Z Show Answers