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+//(9.7)  A regenerator is incorporated in the cycle of Example 9.4. (a) Determine the thermal efficiency for a regenerator effectiveness of 80%. (b) Plot the thermal efficiency versus regenerator effectiveness ranging from 0 to 80%.

+

+//solution

+

+

+//part(a)

+etareg = .8                                                                     //regenerator effectiveness of 80%.

+//from example 9.4

+h1 = 300.19                                                                     //in kj/kg

+h2 = 579.9                                                                      //in kj/kg

+h3 = 1515.4                                                                     //in kj/kg

+h4 = 808.5                                                                      //in kj/kg

+

+hx = etareg*(h4-h2)+h2                                                          //in kj/kg

+eta = ((h3-h4)- (h2-h1))/(h3-hx)                                                //thermal efficiency

+printf('the thermal efficiency is:  %f',eta)

+

+//part(b)

+etareg = linspace(0,.8,50)

+for i= 1:50

+ hx(1,i) = etareg(1,i)*(h4-h2)+h2   

+end

+for i = 1:50

+    eta(1,i) = ((h3-h4)- (h2-h1))/(h3-hx(1,i))

+end

+plot(etareg,eta)

+xtitle("","Regenerator effectiveness","Thermal efficiency")
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