●Water enters a boiler at 22.000C at atmospheric pressure through a pipe at an average velocity of 3.20m/s. The exist steam is at a height of 22 m above the liquid inlet steady state heat added was 2689.81 J/kg, determine the final temperature steam (take g =9.81)
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- A gas flows steadily through a rotary compressor at a temperature of 16 ⁰C, a pressure of 100kPa, and an enthalpy of 392.2 kJkg-1. The gas leaves the compressor at a temperature of 245⁰C, a pressure of 0.6 MPa and an enthalpy of 534.5 kJkg-1. There is no heat transfer to or fromthe gas as it flows through the compressor. Using the steady flow equation appropriate toeach case, evaluate the external work done per unit mass of gas: a) when the inlet and exit velocities of the gas are negligible b) when the inlet velocity of the gas is 80 ms-1 and the exit velocity of the gas is 160 ms-1.The insulated tank in Fig. P3.182 is to be fi lled from a highpressureair supply. Initial conditions in the tank are T =20 ° C and p =200 kPa. When the valve is opened, the initialmass flow rate into the tank is 0.013 kg/s. Assuming anideal gas, estimate the initial rate of temperature rise of theair in the tank.Q29. Steam enters the condenser of a power plant at 3 psia and a quality of 95% with a ratio ofmass flow of 40,000 lbm/hr. It will be cooled with water from a nearby river, which will circulate through the tubes inside the condenser. In order to avoid thermal pollution, the river water is not allowed to suffer from an increase in temperature.temperature greater than 18°F. If steam is to leave the condenser as a saturated liquid at 3 psia, determine how many times the mass flow rate of steam will be the mass flow rate of water, as well as the heat transfer from one system to the other.
- We have a tank (large enough to neglect the velocity of the fluid surface in the tank v1 =0). The tank contains water at a mevel of 15 meters. The tank is enclosed and the air space above the water is at 5 atm. The exit of the tank consists of 25 meters of 2 cm diamter pipe with d/D = 0.0004. It exhaust to the atmospere at 1 atm. What is the exit velocity?Air flows into a turbine at a rate 30 [m 3 /s], a temperature of 1100 [K] anda pressure of 300 [kPa]. The turbine’s work output is 200 [kJ/kg]. Determine thetemperature of the air at the exit, the power output in [kW] and the isentropicefficiency. The pressure ratio of the turbine is 3. The specific gas constant, R, for airis 0.287 [kJ/kg-K].Air at 20°C is hydrodynamically fully developed as it flows in a 1 cm I.D. pipe. The average velocity is 0.7 m/s. If it enters a section where the pipe wall is at 60°C, what is the temperature 0.25 m farther down stream?
- Heat transfers Air is to be heated from 15 C to 270 C, as it flows through a tube 25mm diameter at average velocity 30 m/s. The tube surface is maintained at 280 C and the air is to be provided at rate 0.013 kg/s. Take the water properties k=0.0336 W/m.C , υ = 25.9× 10-6 m2/s , Cp=1.014 kJ/kg.C , ρ = 0.8826 kg/ m3 , Pr=0.689 . Determine the following The necessary tube length Heat transfer coefficient Heat transfer rateThe maximum velocity of an air flow (v= 700 ms-1 and T=160 oCDefine the Under steady-flow conditions?
- . Steam at an initial enthalpy of 100 kJ/kg and inlet velocity of 100 m/s, enters an insulated horizontal nozzle. It leaves the nozzle at 200 m/s. Determine the exist enthalpy (in kJ/kg).Ammonia and air pass through the heat exchanger. While the ammonia is entering as asuperheated vapor at 16 bar pressure and 60C temperature it is leaving as a saturated liquid at thesame pressure but unknown temperature. The ammonia mass flow rate is 400 kg/hour.Air is flowing backward and is heated from 17C to 42C at the constant pressure of 2 bars.NOTE: Find air properties from https://www.peacesoftware.de/einigewerte/luft_e.html a. Draw the ammonia T-v diagram showing the stages, pressures, and temperatures b. How much heat is transferred from ammonia to air assuming no heat transfer to thesurroundings? c.Determine air mass flow rate Please show all steps in solution thanksAn air compressor absorbs 1000 kg of air per hour at a pressure of 100 kPa and 500 kPait presses on the pressure. Specific volume of air at compressor Inlet 0.8 m3/ kg, at Exit0.2 m3/ kg dir. The internal energy of the air at the outlet is 100 kJ/kg more than at the inlet.60 000 kJ/h heat transfer occurs from the compressor to the air. Kinetic and potential energyfind the power needed to operate the compressor, neglecting its changes.