2528df0f75
These changes make it unnecessary to copy header files around during the build process, which tends to confuse IDEs and debuggers. The headers which comprise Cantera's external C++ interface are now in the 'include' directory. All of the samples and demos are now in the 'samples' subdirectory.
71 lines
1.6 KiB
Matlab
71 lines
1.6 KiB
Matlab
function [work, efficiency] = rankine(t1, p2, eta_pump, ...
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eta_turbine)
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%
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% RANKINE
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%
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% This example computes the efficiency of a simple vapor power
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% cycle.
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%
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help rankine
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% create an object representing water
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w = Water;
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% start with saturated liquid water at t1
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set(w,'T',t1,'Liquid',1.0);
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h1 = enthalpy_mass(w);
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s1 = entropy_mass(w);
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p1 = pressure(w);
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% pump it to p2
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pump_work = pump(w, p2, eta_pump);
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h2 = enthalpy_mass(w);
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p2 = pressure(w);
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% heat to saturated vapor
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set(w,'P',p2,'Vapor',1.0);
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h3 = enthalpy_mass(w);
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s3 = entropy_mass(w);
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heat_added = h3 - h2;
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% expand adiabatically back to the initial pressure
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work = expand(w, p1, eta_turbine)
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h4 = enthalpy_mass(w);
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x4 = vaporFraction(w);
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% compute the efficiency
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efficiency = (work - pump_work)/heat_added
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function w = pump(fluid, pfinal, eta)
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% PUMP - Adiabatically pump a fluid to pressure pfinal, using a pump
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% with isentropic efficiency eta.
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%
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h0 = enthalpy_mass(fluid);
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s0 = entropy_mass(fluid);
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set(fluid, 'S', s0, 'P', pfinal);
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h1s = enthalpy_mass(fluid);
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isentropic_work = h1s - h0;
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actual_work = isentropic_work / eta;
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h1 = h0 + actual_work;
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set(fluid, 'H',h1, 'P',pfinal);
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w = actual_work;
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function w = expand(fluid, pfinal, eta)
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% EXPAND - Adiabatically expand a fluid to pressure pfinal, using a
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% turbine with isentropic efficiency eta.
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%
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h0 = enthalpy_mass(fluid);
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s0 = entropy_mass(fluid);
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set(fluid, 'S', s0, 'P', pfinal);
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h1s = enthalpy_mass(fluid);
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isentropic_work = h0 - h1s;
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actual_work = isentropic_work * eta;
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h1 = h0 - actual_work;
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set(fluid, 'H',h1, 'P',pfinal);
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w = actual_work;
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