Chapter 6, Problem 6.40P

Current Attempt in Progress A pump is used to circulate hot water in a home heating system. Water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. The inlet pressure and temperature are 14.7 Ibf/in.?, and 180°F, respectively; at the exit the pressure is 90 Ibf/in.2 The pump requires 1/25 hp of power input. Water can be modeled as an incompressible substance with constant density of 60.58 Ib/ft and constant specific heat of 1 Btu/lb · °R. Neglecting kinetic and potential energy effects, determine the temperature change, in °R, as the water flows through the pump. AT = i °R

From the turbine the heat loss per kg of steam flow rate is 5 kW. Find the power developed in kW by the steam turbine per kg of steam flow rate?

Ts diagrams for two reversible thermodynamic power cycles are shown in the following figure. Both cycles operate between a high temperature reservoir at 500 K and a low temperature reservoir at 300 K. The process on the left is the Carnot cycle described in Section 2.9. The process on the right is a Stirling cycle, which is similar to a Carnot cycle, except that the two steps (state 4 to state 1) and (state 2 to state 3) are at constant volume. Which cycle, if either, has a greater efficiency? Explain.

Assume 3.15 lb/sec of fluid enter a steady-state, steady-flow system with P1 = 92.43 psia, P1 = 0.392 lb/ft, v1 = 95.09 fps, u = 793.46 BTU/lb, and Jeave with P2 = 13.49 psia, p2 = 0.191 lb/ft, v2 = 499.53 fps, and u2 = 773.05 BTU/lb. During the passage through the open system, each pound rejects 11.1 BTU of heat. Determine the work in hp. %3D %3D !!

Thermodynamics problem. Answer letter G to I only.

In turbochargers a turbine is directly connected to a compressor. The power harvested by the turbine is used to power the compressor. In the figure below a turbine runs on steam and powers a compressor on air. Air can be considered a perfect gas with k = 1.34, R = 0.28 kJ/kgk and cp = 1.02 kJ/kgK. The air enters the compressor at p₁ = 1bar, T₁ 300K and a mass flow rate of mdot = 5.9 kg/s and exits at p2 = 5.2 bars. The steam enters the isentropic turbine at P3 = 2 MPa, T3 = 320°C and exits at p4 = 100 kPa. 9 State 2 Isentropic Compressor State 1 Air - perfect gas T₁=300K P₁ = 1 bar W Answer: tubine =? State 4 Isentropic Turbine State 3 Steam T3=320°C P3= 2MPa What is the quality of steam leaving the turbine?

The first step of a thermodynamic cycle is an isobaric process with increasing volume. The second is an isochoric process, with decreasing pressure. The last step may be either an isothermal or adiabatic process, ending at the starting point of the isobaric process. Sketch a graph of these two possibilities, and comment on which will have greater net work per cycle.

The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz⁢= 5 m higher than the pump, where m˙=50 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored.   Determine:(a) the magnitude of the pump power, in kW.(b) the mass flow rate of steam, in kg/s, that flows through the turbine.

For an impulse steam turbine of De Lavel type, the nozzle having an angle of 16°, delivers 1 kg of steam per sec at a speed of 720 m/s to a set of blades moving at 180 m/s. The blade angle at outlet is 25° and blade velocity co-efficient is 0.72. Determine the following: 1.  Power of the wheel in kilowatt. 2. Blade efficiency in Percentile (%) 3. The energy lost in the blades in kJ/kg.