TITLE.PM5

78 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-1.p65 Total amount of heat to be supplied = 2 × 2432.26 = 4864.52 kJ. (Ans.) Ex ...

PROPERTIES OF PURE SUBSTANCES 79 Dharm \M-therm/th3-1.p65 (i)The total heat supplied to feed water per hour to produce wet steam ...

80 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-1.p65 Solution. Mass of steam in the cooker = 1.5 kg Pressure of steam, p = 5 b ...

PROPERTIES OF PURE SUBSTANCES 81 Dharm \M-therm/th3-1.p65 Solution. Capacity of the spherical vessel, V = 0.9 m^3 Pressure of th ...

82 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-1.p65 0.918 × 0.462 = x 3 × 0.606 ∴ x 3 =0918 0462..0 606.× = 0.699. (Ans.) (ii ...

PROPERTIES OF PURE SUBSTANCES 83 Dharm \M-therm/th3-1.p65 Heat supplied per kg of steam = (1 – x 1 ) hfg 1 + cps (300 – 179.9) = ...

84 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-2.p65 (i)Dryness fraction, x : At 7 bar, hg = 2762 kJ/kg, hence since the actua ...

PROPERTIES OF PURE SUBSTANCES 85 Dharm \M-therm/th3-2.p65 (ii) The specific volume, v = 0.01722 m^3 /kg. (Ans.) ∴ The internal e ...

86 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-2.p65 Temperature of superheated steam = 400°C (Tsup = 400 + 273 = 673 K) Dryne ...

PROPERTIES OF PURE SUBSTANCES 87 Dharm \M-therm/th3-2.p65 Main (20 bar, 250°C) Boiler B with superheater (20 bar, 350°C) 1 Boile ...

88 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-2.p65 At 10 bar, 400°C. From steam tables, hsup = 3263.9 kJ/kg ; ssup = 7.465 k ...

PROPERTIES OF PURE SUBSTANCES 89 Dharm \M-therm/th3-2.p65 At 1.4 bar, the enthalpy of 3 kg of steam =^3 hxhf+ fg = 3 [ 458.4 + 0 ...

90 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-2.p65 Fig. 3.14. Tank or bucket calorimeter. Let, ps = Gauge pressure of steam ...

PROPERTIES OF PURE SUBSTANCES 91 Dharm \M-therm/th3-2.p65 The calculated value of dryness fraction neglecting losses is always l ...

92 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-2.p65 At 1.1 bar. From steam tables, hf = 428.8 kJ/kg ; hfg = 2250.8 kJ/kg ∴ ms ...

PROPERTIES OF PURE SUBSTANCES 93 Dharm \M-therm/th3-2.p65 2 (^34) 1 x 1 h s Fig. 3.16. Throttling process. Hence the dryness fra ...

94 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-2.p65 which now has a higher dryness fraction, is passed through the throttling ...

PROPERTIES OF PURE SUBSTANCES 95 Dharm \M-therm/th3-2.p65 Final pressure of steam, p 3 = 760 + 5 = 765 mm =^765 1000 ×1.^3366 (Q ...

96 ENGINEERING THERMODYNAMICS Dharm \M-therm/th3-2.p65 Highlights A pure substance is a system which is (i) homogeneous in comp ...

PROPERTIES OF PURE SUBSTANCES 97 Dharm \M-therm/th3-2.p65 Mollier chart/diagram is more widely used than any other entropy diag ...