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A certain fluid of 10 bar is contained in a cylinder behind a piston, the initial volume being 0.05m³. Calculate the work done by the fluid when it expands reversibly according to the linear law to a final volume of 0.2m³ and a final pressure of 2 bars.

The shaft of a steam turbine produces 600 Nm torque at 50rev/s. Calculate the work transfer rate from the steam


A compressed spring above the piston exerts a force of 60 N on the position. If the atmospheric pressure is 95kpa, determine the pressure inside the cylinder


. A wet steam at a pressure of 1.0 𝑀𝑃𝑎 has a quality of 85%.


i. Use thermodynamic steam tables to determine its entropy and specific volume.


ii. Use the Mollier chart to determine its enthalpy.


iii. For each of the results above, calculate the internal energy of the steam.

Determine the enthalpy of a saturated steam at 30𝑜 𝐶 using the non-flow energy equation


and the tabulated properties of pressure, specific volume and internal energy. Compare


the result with the tabulated value of ℎ𝑔.

Find out about the wall construction (number and type of layers) of a sauna (treatment and/or relaxation room as illustrated in Figure 6), thereby determining the heat transfer mode, the range of ambient conditions under which they operate, typical heat transfer coefficients on the inner and outer surfaces of the wall, and the heat generation rates inside. Determine the size and methodology of the heating and air-conditioning system that will be able to maintain the typical sauna conditions, for when 10 persons are inside the sauna at the same time.


Two large parallel planes having emissivities of 0.4 and 0.6 are maintained at temperatures of 846 K and 288 K, respectively. A radiation shield having an emissivity of 0.2 on both sides is placed between the two planes. Calculate (a) the heat-transfer rate per unit area if the shield were not present, (b) the heat-transfer rate per unit area with the shield present. If the emissivity of the shield is increased by 50%, how many shields are needed for the heat transfer rate per unit area as compared with the obtained results from (b)?


A piston–cylinder device contains 1.2 kg of nitrogen gas at 120 kPa and 27°C. The gas is now compressed slowly in a polytropic process during which PV1.3 = constant. The process ends when the volume is reduced by one-half. Determine the entropy change of nitrogen during this process.


The radiator of a steam heating system has a volume of 20 L and is filled with superheated vapor at 200 kPa and 150°C. At this moment both the inlet and exit valves to the radiator are closed. After a while the temperature of the steam drops 40C as a result of heat transfer to the room air. Determine the entropy change of the steam during this process.


An air-conditioning system operating on the reversed Carnot cycle is



required to transfer heat from a house at a rate of 750 kJ/min to



maintain its temperature at 24°C. If the outdoor air temperature is



35°C, determine the power required to operate this air-conditioning



system.

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