Q5/ A stream of hot water at 150 °F flowing at a rate of 409 Ibm/min is to be produced by mixing water at 60 °F and steam at 30 psia and 280 °F in a suitable mixer. What are the required flow rates of steam and cold water. Assume Q = 0.

7.10. A cylinder with a movable piston contains 4.00 liters of a gas at 30°C and 5.00 bar. The piston is slowly moved to compress the gas to 8.00 bar. (a) Considering the system to be the gas in the cylinder and neglecting AEp, write and simplify the closed-system energy balance. Do not assume that the process is isothermal in this part. (b) Suppose now that the process is carried out isothermally, and the compression work done on the gas equals 7.65 L-bar. If the gas is ideal so that Û is a function only of T, how much heat (in joules) is transferred to or from (state which) the surroundings? (Use the gas-constant table in the back of the book to determine the factor needed to convert L.-bar to joules.) (c) Suppose instead that the process is adiabatic and that Û increases as T' increases. Is the final system temperature greater than, equal to, or less than 30°C? (Briefly state your reasoning.)

The liquid food is flowed through an uninsulated pipe at 90 ° C. The product flow rate is 0.3 kg / s and has a density of 1000 kg / m³, specific heat 4 kJ / (kg K), a viscosity of 8 x 10-6 Pa s, and a thermal conductivity of 0.55 W / (m) K). Assume that the change in viscosity is negligible. The internal diameter of the pipe is 25 mm with a thickness of 3 mm made of stainless steel (k = 15 W / [m ° C]). The outside temperature is 15 ° C. If the outer convective heat transfer coefficient is 18 W / (m² K), calculate the heat loss at steady state per meter pipe length. a. Find the convection coefficient in the pipe = AnswerW / m² ° C. b. Calculate heat loss per meter pipe length = Answerwatt.

The liquid food is flowed through an uninsulated pipe at 90 ° C. The product flow rate is 0.3 kg / s and has a density of 1000 kg / m³, specific heat 4 kJ / (kg K), a viscosity of 8 x 10-6 Pa s, and a thermal conductivity of 0.55 W / (m) K). Assume that the change in viscosity is negligible. The internal diameter of the pipe is 25 mm with a thickness of 3 mm made of stainless steel (k = 15 W / [m ° C]). The outside temperature is 15 ° C. If the outer convective heat transfer coefficient is 18 W / (m² K), calculate the heat loss at steady state per meter pipe length. a. Find the convection coefficient in the pipe = AnswerW / m² ° C. b. Calculate heat loss per meter pipe length = Answerwatt.

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5. A steam power plant operates on the cycle below. Complete the table. -2200.0 kJ/kg Ideal Turbine Work Turbine Efficiency Ideal Pump Work Pump Efficiency 0.75 100.0 kJ/kg 0.80 4000.0 kJ/kg 125 kg/s Boiler Heat Transfer Steam Rate Condenser Heat Transfer Cycle Thermal Efficiency Power Rating (kW)

[1] Repeat Example 7.10 (pages 288-289) but with the following exceptions: water is discharged at 9,000 kPa, and n=0.8. Calculate the work of the pump and AT using steam tables and equation 7.25

oil flows at a rate of 1000 kg/min from an open reservoir at the top of a hill 400 m in height to another reservoir at the bottom of the hill. heat is supplied to the oil on its way at the rate 1800 kj/min and work is supplied by a 1 hp pump. take the mean specific heat of oil to be 3.35 kj/kg k. determine the temperature change of the oil.

Water vapor expands at a turbine at a speed of 1350 kg / s, the inlet conditions are 8MPA and 400C, the outlet conditions are 500KPa and 250C, the turbine does 200kW work. Neglect changes in kinetic and potential energy. a) Write and simplify the equation that applies to this system.  b) What are the specific enthalpies of the input and output current? c) What is the heat transfer in Kw?  d) What is the specific volume and volumetric flow at the inlet?  e) What is the specific volume and the volumetric flow at the outlet

Air is contained in a piston cylinder arrangement as undergoes a cycle as shown in the figure. The initial temperature T1 = 800oF and the amount of air is 1 lbm. The process from 3 to 1 is adiabatic. Determine the total work and the net heat transfer in Btu. Assume constant heat capacities.