A closed, expandable system like that shown below is operated in an adiabatic manner.First, 15,000 lb;ft of work are done by this system. Then, work is applied to the stirringdevice to raise the internal energy of the fluid by 10.28 Btu. 1) Calculate the net increasein the internal energy of this system, and 2) explain how you could calculate the change intemperature of the system.002019 McGraw-Hill Education

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Answered: A closed, expandable system like that…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Q2 (a) A heat engine is a system that converts heat into mechanical energy, which can then be used to do mechanical work. In your opinion, is it possible for a heat engine to operate without rejecting any waste heat to a low-temperature reservoir. Give your explanation.
Thermodynamics Water is being cooledd in a closed container while being stirred by a paddle wheel. During thisprocess, 25 kJ of heat is taken away from the water, and 15 kJ of heat is added to the water. Thepaddle-wheel work amounts to 5 N.m. Determine the final energy of the system if its initialenergy is 10 kJ. (Sketch the system boundaries)
You work in a company in the energy sector. The competition announces a new turbine that can operate at low temperatures thanks to the use of R134a as the working fluid. According to the competition, this adiabatic turbine has the characteristics shown in the figure below when operating in steady state. (a) How much Power would this turbine generate? (b) Is it possible that it operates as the competition says? Turbina = turbine
b) Air at 25°C and 1(atm) is cooled at the rate of 3000 m³/hr to -8°C by refrigeration. For a surroundings temperature of 25°C, what is the minimum power requirement ?
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A power plant operates in an idealized Rankine cycle, using water as the working fluid (Figure 3). The steam at the exit of the boiler has a pressure of 6 MPa and temperature of 600 °C (point 1). The water at the exit of the condenser has a pressure of 15 kPa (point 3). The condenser employs a nearby river as the cooling source, which can be regarded to have a constant temperature of 25 °C. The mass flow rate of the steam is 80 kg/s. The hot reservoir has a temperature of 1400 K. Regard water as an incompressible liquid. During pumping, the density of water remains unchanged as Point 3 in Figure 3. Qin Boiler i wwwwww Pump Turbine Wp 3 Figure 3 W₁ Cooling water Condenser
A heat pump used for heating shown is essentially an air conditioner installed backward. It extracts energy from colder air outside and deposits it in a warmer room. Suppose the ratio of the actual energy entering the room to the work done by the device’s motor is 10.0% of the theoretical maximum ratio. Determine the energy entering the room per joule of work done by the motor given that the inside temperature is 20.0°C and the outside temperature is -5.00°C.

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