Chap.2 Definition of efficiency of ©power cycle n, Target Gain refrigeration cycle B, Efficiency= Cost heat pump cycle y COP 上游充通大 May15,2018 6 SHANGHAI BAO TONG LINIERSITY
May 15, 2018 6 Chap. 2 Definition of efficiency of power cycle η, refrigeration cycle β, heat pump cycle γ Target Gain Efficiency= Cost COP
Chap.3-4 Simple compression system ©State principle ©Definition of phase P-v-T relation/surface S/L,L/V,S/V equilibrium lines Triple point,critical point p-v diagram,T-v diagram,remember the direction for increasing/decreasing T,p,or V 国 Subcooled (compressed)liquid,superheated vapor 上游充通大￥ May15,2018 7 HANGHAI HAO TONG LINIVERSITY
May 15, 2018 7 Chap. 3 ‐ 4 Simple compression system State principle Definition of phase P‐v‐T relation/surface S/L, L/V, S/V equilibrium lines Triple point, critical point p‐v diagram, T‐v diagram, remember the direction for increasing/decreasing T, p, or V Subcooled (compressed) liquid, superheated vapor
Chap.3 T<->P on sat.lines;horizontal line in two-phase Quality X=- vapor二- mvapor mrotal miguid+mvapor © Know how to use property tables,interpolation Specific volume,specific internal energy © Calculate properties in the two-phase region Know how to determine the phase location of the state point. Concept of enthalpy h=u+pu 上游充通大率 May15,2018 8 HANGHAI HAO TONG LINIVERSITY
May 15, 2018 8 Chap. 3 T<‐>P on sat. lines; horizontal line in two‐phase Quality Know how to use property tables, interpolation • Specific volume, specific internal energy Calculate properties in the two‐phase region Know how to determine the phase location of the state point. Concept of enthalpy vapor vapor total liquid vapor m m x mmm
Chap.3 ④ Evaluate h,v,u,q,w or changes for processes (single phase,or two-phase) Specific heat(const.v,const.p),specific heat ratio Approximate values for v,u,and h at liquid states (incompressible)can be obtained using saturated liquid data (based on Temperature) 上游充通大粤 May15,2018 9 HANGHAI HAO TONG LINIVERSITY
May 15, 2018 9 Chap. 3 Evaluate h, v, u, q, w or changes for processes (single phase, or two‐phase) Specific heat (const. v, const. p), specific heat ratio Approximate values for v, u, and h at liquid states (incompressible) can be obtained using saturated liquid data (based on Temperature)
Chap.3 Ideal gas model Universal gas constant,gas constant,their relations Pay attention to the units. Ideal gas equation of state u,h,cpc:temperature dependent only(not for s) c-u;cp-h relations I cp c for ideal gas; 上游充通大粤 May15,2018 10 HANGHAI HAO TONG LINIVERSITY
May 15, 2018 10 Chap. 3 Ideal gas model Universal gas constant, gas constant, their relations Pay attention to the units. Ideal gas equation of state u, h, c p, c v: temperature dependent only (not for s) c v‐ u; c p –h relations | c p, c v for ideal gas;