An adiabatic compressor with 65% efficiency is fed with 25kg/sec of saturated steam at 200kPa. The steam at the exit of the compressor is 1000kPa. 1) What is the state and quality of the steam at the outlet? 2) What is the power requirement for the compressor? 3) What is the enthalpy and the temperature of the steam at the outlet?

Consider a refrigeration system based on an ideal vapor-compression cycle using R-134a as the refrigerant. It operates between 0.7 MPa and 0.12 MPa with a flow rate of 0.5 mol/s. Calculate the following: (a) the rate of heat removal from the refrigerated unit (b) the power input needed to the compressor (c) the COP The properties of R-134a can be found at http://webbook.nist.gov/chemistry/fluid/.

Thermal systems problem: Assume that nitrogen is available in a storage tank at 2 MPa and 210 K. On the following chart, show the path for the following scenarios. a) An expansion valve is connected to this tank that drops the fluid (i.e., nitrogen) pressure at its outlet to one atmosphere.   b) A compressor is connected to this tank that raises the fluid pressure at its outlet to 10 MPa.   c) A turbine is connected to this tank that drops the fluid pressure at its outlet to one atmospheric pressure. d) A heat exchanger is connected to this tank that raises the fluid temperature to 330K at its outlet. e) A heat exchanger is connected to this tank that drops the fluid temperature to 135K at its outlet.   f) Show the process for the fluid to change its state from 2 MPa and 210 K to 14 MPa and 240 K.  Identify the required equipment. g) If a coolant at 150 K is available, is it possible to change the state of nitrogen from 2 MPa and 210 K to saturated liquid at atmospheric pressure?  If…

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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

Separate streams of air and water flow through the compressor and heat exchanger arrangement shown below. Steady-state operating data is provided in the figure. Heat transfer with the environment can be neglected, as can all potential and kinetic energy effects. Air is modeled as an ideal gas. Determine: (a) the total power required by both compressors, in kW. (b) the mass flow rate of the water, in kg / s.

Air at 150 kPa and 25°C is transported through a 2-inch Schedule 40 commercial steel pipe. Consider that the air behaves as an ideal gas, that the flow is adiabatic and that the Mach number under these conditions of pressure and temperature is 0.35. Calculate the length of the pipe when the air pressure and temperature decrease to 54.375 kPa and -10.6°C.