Steam enters a heat exchanger operating at steady state at

Chapter 4, Problem 4.76

(choose chapter or problem)

Steam enters a heat exchanger operating at steady state at 250 kPa and a quality of 90% and exits as saturated liquid at the same pressure. A separate stream of oil with a mass flow rate of 29 kg/s enters at \(20^{\circ} \mathrm{C}\) and exits at \(100^{\circ} \mathrm{C}\) with no significant change in pressure. The specific heat of the oil is \(c=2.0 \mathrm{~kJ} / \mathrm{kg} \cdot \mathrm{K}\). Kinetic and potential energy effects are negligible. If heat transfer from the heat exchanger to its surroundings is 10% of the energy required to increase the temperature of the oil, determine the steam mass flow rate, in kg/s.