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Q.4 Saturated steam at a gauge pressure of 3.0 bar is to be used to heat a stream of ethane. The ethane enters a heat exchanger at 16C and 1.5 bar gauge at a rate of 750m3/min and is heated at constant pressure to 93C. The steam condenses and leaves the exchanger as liquid at 30C. The specific enthalpy of ethane at the given pressure is 941kJ/kg at 16C and 1073kJ/kg at 93C. (a) How much energy (kW) must be transferred to the ethane to heat it from 16C to 93C ? (b) Assuming that all the energy transferred from the steam goes to heat the ethane, at which rate in m3/s must steam be supplied to the exchanger? If the assumption is incorrect, would the calculated value be too high or too low