In a process at a chemical plant, steam at 0.25 MPa is to be generated in a steam generator. This generator is a horizontal tube bundle, 25 kg/s of a heat carrying oil is flowing through the tubes....

In a process at a chemical plant, steam at 0.25 MPa is to be generated in a steam generator. This generator is a horizontal tube bundle, 25 kg/s of a heat carrying oil is flowing through the tubes. The oil is to be cooled from 200 ◦C to 150 ◦C. The water will evaporate on the outside of the tubes. The heat transfer coefficient between the oil and the wall is α_i=700W/m²K. The thermal resistance of the tube wall may be neglected. The water enters the generator at approximately its boiling temperature. How much steam can be produced per hour? What is the area of the steam generator? The following values are given: specific heat capacity of the heat carrying oil c_poil=2.4 kJ/kgK, boiling temperature of water at 0.25 MPa: ϑ_s=127.4 ◦C, enthalpy of vaporization ∆hv=2160 kJ/kg.