Chapter 8, Problem 8.114EP

In a turbine, steam enters with an enthalpy of 1275 Btu/lb, and leaves with an enthalpy of 1115 Btu/lbm. The transferred heat is 13 Btu/ibm. Find the turbine work in hp where the steam flow rate is 5 lbm/sec?

A Camot engine operates between 12000F and 1000F and rejects 40 Btu to the low temperature heat reservoir. Find the net work.

A bio-reactor must be kept at 42°C by a heat pump driven by a 3 kW motor. The reactor has a heat loss of 12 kW to the ambient at 15°C. What is the minimum COP that will be acceptable for the heat pump?

Heat is transferred to a heat engine from a fumace at a rate of 120KW. If the rate of waste heat rejection to a nearby river is 50000W. Find the net Power output and the thermal efficiency for this heat engine.

Through a combustion of a fossil fuel at 35000C, an engine receives energy at a rate of 3000Btu/s to heat a steam to 15000C. There is no energy loss during the combustion process, the steam in turn produces 1000Btu/s of work and rejects the remaining energy to the surrounding at 3000C, What is the thermal efficiency of the plant? What is the reversible work and Carnot efficiency? What is irreversibility?

During a non-flow isentropic process of 2 kg of air, the temperature increases from 45oC to 70oC. Find the change of internal energy. a. 24.3 kJ     b. 40.5 kJ     c. 55.9 kJ     d. 35.9 kJ

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Note: Use the relevant chart for each problem.in addition to having the solution on a piece of paper Q2/ A refrigeration system operates according to reversed Carnot cycle, low temperature is -40 °C and the work done is 1.2 kW/TR. Find; the coefficient of performance as refrigerator and heat pump, absorbed heat and rejected heat.

A tank of water has a shaft rotating at 60 rpm with a torque of 40 N-m that is stiring the water. A heater is also present that operates at 120V and draws 4A of current. Heat is then removed from the water such the the total energy content of hte water is constant. How much heat is removed?