3: The heat transfer Q from the steam turbine shown in figure below is 8.5 kJ/s. Determine me power output of the turbine (Take g-9.8 m/s²). 6 m m₁ = 1.5 kg/s P-20 bar T-350 °C CF50 m/s Q 3 m W = ? mo = 1.5 kg/s P₁=1 bar C.= 100 m/s X, 100% Reference plane
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- Water flows through a horizontal coil heated by steam condenaing on the outside. If the inlet pressure and temperatire are 2 atm and 160°F (state 1) and at the exit 1 atm and 220 °F (state 2), calculate the heat added to the coil per pound mass of water. The entering velocity is 5 ft/s, and the leaving, 500 ft/s. Data: H1=127.9 Btu/lb, H2=1154.4 Btu/lbA. 1031 Btu/lbB. 1042 Btu/lbC. 1048 Btu/lbD. 1052 Btu/lbWhat is the best coefficient of performance for a heat pump that has a hot reservoir temperature of 50.0ºC and a cold reservoir temperature of −20.0ºC? (b) How much heat transfer occurs into the warm environment if 3.60 × 107 J of work (10.0 kW · h) is put into it? (c) If the cost of this work input is 10.0 cents/kW · h, how does its cost compare with the direct heat transfer achieved by burning natural gas at a cost of 85.0 cents per therm. (A therm is a common unit of energy for natural gas and equals 1.055 × 108 J.)An office for seating 30 occupants is to be maintained at 22°C DB and 55% RH. The outdoor conditions are 36°C DB and 27°C WB. The various loads in the office are: Solar heat gain = 8,500W; Sensible heat gain per occupants = 83 W; Latent heat gain per occupant = 100W; Lighting load = 2,500W; Sensible heat load from other sources = 12,000W; and Infiltration load = 15 m3/min. Assuming 40% fresh air and 60% of recirculated air passing through the evaporator coil and the by-pass factor of 0.12, determine the following: A) The Dew Point Temperature of the coil, in degrees Centigrade. B) The Capacity of the Airconditioning Plant, in Tons of Refrigeration.
- 1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is anegligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specificheat is c = 4,370 J/(Kg K). There is a 1.5(105) W rate of heat loss from the boiler during this process to asurrounding at 293.2 k. Consider steady state conditions.1.2 Calculate the total rate of entropy production in Problem 1.1.1.3 Calculate the total rate of exergy destruction (W) in Problem 1.1. The dead statetemperature is 293.2 K and pressure is 1 bar.1.4 Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to theconditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The highheating value (HHV) of the fuel is 50.02 MJ/kg.1.5 Calculate the exergy destroyed in the process described by problem 1.4. The exergy…20.The following performance of gas turbine engine: compressor inlet temperature, 525°R; compressor isentropic discharge temperature, 673°R; actual compressor discharge temperature, 693°R; turbine inlet temperature, 1505°R; turbine isentropic discharge temperature, 1185°R; and turbine actual discharge temperature, 1218°R. For these conditions calculate the turbine isentropic efficiency.A. 83.24% B. 89.68% C. 87.24% D. 92.68%
- Water flows through a horizontal coil heated by steam condensing on the outside. If the inlet pressure and temperature are 2 atm and 160°F (state 1) and at the exit 1 atm and 220°F (state 2), calculate the heat added to the coil per pound mass of water. The entering velocity in 5 ft/s, and the leaving, 500 ft/s. Data: H1=127.9 BTU/lb, H2=1154.4 BTU/lbA. 1031 BTU/lbB. 1042 BTU/lbC. 1048 BTU/lbD. 1052 BTU/lb39 - The speed of the air entering a nozzle at the nozzle exit was 196 m/s and its density was measured as 0.681 kg/m³. Since the mass flow rate in the nozzle is 1,421 kg/s continuously, which of the following is the outlet cross-sectional area of the nozzle? a) 48,325 cm² B) 49,373 cm² NS) 106,461 cm² D) 110,603 cm² TO) 84,678 cm²Thermodynamics 2. Determine the useful power produced in a thermally insulated turbine from 30 bar and 360Ç to 0.5 bar and 90% quality. The water flow is 15000kg/h
- A 5-feet diameter Chimney is designed to handle a flue gas produced in a steam power plant at a rate of 17 lb/s. The barometric pressure is 29.92-inch Hg. Outside air enters the combustion chamber at 90 F. The average temperature of the flue gas inside the Chimney is 572 F and its molecular weight is 30. Cv = 0.35, Rair = 53.342 ft-lb/lb-R. Calculate: 5. The total draft, feet of air. 6. The height of the Chimney, feet7 . Calculate the work of a steam turbine with the following thermodynamic parameters: Enthalpy in = 1500 Btu/lbm Enthalpy out = 1053 Btu/lbm Velocity in = 125 ft/sec Velocity out = 130 ft/sec Inlet nozzle is 8 ft above the turbine Heat loss inside the turbine is 10 Btu/lbmA turbine is driven by a system that enters the turbine at the ff. conditions: 500 kg/h, 44 atm, 450 deg C, 60 m/s linear speed. The steam exits at a point five meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 360 m/s speed. 70,000 W of shaft work is delivered by the turbine while 104 kilocalories/h heat is lost. Here are the questions to be answered: 1. Why is the value of Wexp 0? (Explain) 2. Given the above values, can you calculate the Wflow? (Yes/No)