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Thermodynamics properties and equilibria calculations for chemical engineering.

There is a newer version: 3.5

package termo.eos.alpha;

import termo.component.Compound;

/**
 *
 * @author Hugo Redon Rivera
 */
public class TwoEquationsAlphaExpression extends Alpha{
    
    private Alpha alphaAboveTc;
    private Alpha alphaBelowTc;

    @Override
    public String getEquation() {
        if(equation == null){
            StringBuilder b = new StringBuilder();
            
            b.append("-----T < T_c ");
            b.append("\\\\");
            b.append(alphaBelowTc.getEquation());
            b.append("\\\\");
            
            b.append("-----T > T_c");
            b.append("\\\\");
            b.append(alphaAboveTc.getEquation());
            
            equation = b.toString();
        }
        
        return equation;
    }
    
   
    
    @Override
     public  double alpha(double temperature,Compound component){
           return getProperAlpha(temperature, component).alpha(temperature, component);
    }
       @Override
    public double TempOverAlphaTimesDerivativeAlphaRespectTemperature(double temperature, Compound component) {
            return getProperAlpha(temperature, component).TempOverAlphaTimesDerivativeAlphaRespectTemperature(temperature, component);
    }
       
       public Alpha getProperAlpha(double temperature ,Compound component){
                double criticalTemperature = component.getCriticalTemperature();
        double q = component.getK_StryjekAndVera();
        
        double reducedTemperature = temperature / criticalTemperature;
        
        if(reducedTemperature <1){
            return alphaBelowTc;
        }else{
            return alphaAboveTc;
        }
       }

    /**
     * @return the alphaAboveTc
     */
    public Alpha getAlphaAboveTc() {
        return alphaAboveTc;
    }

    /**
     * @param alphaAboveTc the alphaAboveTc to set
     */
    public void setAlphaAboveTc(Alpha alphaAboveTc) {
        this.alphaAboveTc = alphaAboveTc;
    }

    /**
     * @return the alphaBelowTc
     */
    public Alpha getAlphaBelowTc() {
        return alphaBelowTc;
    }

    /**
     * @param alphaBelowTc the alphaBelowTc to set
     */
    public void setAlphaBelowTc(Alpha alphaBelowTc) {
        this.alphaBelowTc = alphaBelowTc;
    }

    @Override
    public int numberOfParameters() {
        return alphaBelowTc.numberOfParameters();
    }

    @Override
    public double getParameter(Compound component, int index) {
        return alphaBelowTc.getParameter(component, index);
    }

    @Override
    public void setParameter(double value, Compound component, int index) {
        alphaBelowTc.setParameter(value, component, index);
    }



	@Override
	public String getParameterName(int index) {
		return alphaBelowTc.getParameterName(index);
	}
    
    
    
 

}