Heat issue of waste boilers
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The company’s waste boiler contains water at a high pressure of 1.3 MPa and a temperature of around 150 degrees Celsius. After heating, this water turns into saturated steam at a pressure of 0.5 MPa (with a temperature of around 135 degrees Celsius). How can the amount of heat absorbed during this heating process be calculated? Waiting online, thank you! ! :P
Calculate the difference in enthalpy between the two; for steam, the latent heat of vaporization must be taken into account
P(Mpa): 1.3 T(c): 150 H(KJ/kg): 632.657828325822. Given saturated P(Mpa): 0.5, the saturated T(c) is 151.841534062104. Saturated water enthalpy h’+(KJ/kg): 639.986676254435; saturated water entropy s’+(J/kg·K): 1.85996269338013. Saturated steam enthalpy h”+(KJ/kg): 2748.78789350552. 2749 – 633 = 2116 KJ/kg; therefore, 2116 KJ of energy is required to heat 1 kg of material