The magnitudes of specific heats depend on the temperature or pressure at which the phase change occurs. Select one: True False
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43.)
The magnitudes of specific heats depend on the temperature or pressure at which the phase change occurs.
A potential energy change of 1 kJ/kg corresponds to an elevation difference of 102 m. Devices like compressors, heat exchangers have elevation difference higher than this value and the potential energy is neglected for these devices.
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- Describe the T-s diagrams accordingly by filling in the blanks. Use the sets of words given below for the correct description. reheat/ closed Ideal / Actual / vapour /cycle /Carnot/ Rankine/ Brayton/Ericsson/Stirling/regenerative/ open/with/a Nino To C @ 4 2. 5. 6. a b с e T f 1 4 In a two-stage gas turbine plant, with reheating after the first stage TA 25 decreases the thermal efficiencies. increases the thermal efficiencies. does not affect thermal efficiencies. Decreases the work ratio. increases the work ratio. does not affect the work ratio. equal. unequal. 2 5 The ideal compressor work and turbine work in a jet-propulsion engine is a b 9in 2/ qout Wpump.in High-pressure turbine 3 Reheating 6 Wturb,out Low-pressure turbine с not related to each other. d unpredictable (a) By writing an energy balance on the heat exchanger of a binary vapour power cycle, obtain a relation for the exit enthalpy regarding the mass flow rates of two fluids in terms of the other enthalpies. Take the…1. A single-acting, single-cylinder air compressor is rated at 4.25 (m)^3/min of air. The suction conditions are 1 atm and 27 C and discharge pressure is 1034 kPa. The compression process follows the equation PV^1.35 = C. Determine the power, in kW, required to compress the air. a. -30.22 kW b. -22.87 kW c. -82.27 kW d. -27.22 kWHANDWRITTEN AND FINAL ANSWER MUST BE IN ENGLISH UNITS. Show solution.ANSWER iii. Consider an ideal gas with the following characteristics: R = 115 ft-lbf/lbm-R Cp = 0.25 + 0.00035T (BTU/lbm-R) i. Solve for the value of k at 1250 R. ii. Refer to the table shown below: SEE IMAGE iii. Solve the following unknown parameters for Carnot cycle: Volume at end of isothermal compression Heat added and Heat rejected Wnet Efficiency Mean effective pressure iv. Solve the following unknown parameters for Otto Cycle Mass Pressure and Temperature ateach corner Heat added and Heat rejected Wnet Efficiency Mean effective pressure Percentage clearance v. Solve the following unknown parameters for Diesel Cycle with 6% cut-off. Compression ratio Percentage clearance Heat added and Heat rejected Wnet Efficiency Mean effective pressure
- kg). Q3. The steam at 215 bar and 500 °C is supplied to a steam turbine. It expands to 40 bar and 280 °c. It is then reheated to 490 °C and expands to 8 bar and 270 °C. The steam coming out from the second expansion of the turbine is further reheated to 490 °C and expands to condenser pressure of 0.07 bar. The steam entering into the condenser is dry saturated. Assuming the pressure losses in first heater of 1 bar and in second heater 0.5 bar, find (a) the thermal efficiency and power developed if the flow of steam is 10 kg/s (b) the isentropic efficiency of the expansion stages. Neglect the pump work. Mis-n-n (42.8 %, 1738 kW,78.5%,95.4 %, 87%) Q4. The steam nt 100FLUID MECH Support your answer with the appropriate solution and diagram. 5. Air at 2.50 kg/m^3 enters a nozzle that has an inlet to exit ratio of 2:1 with a velocity of 120 m/s and leaves with a velocity of 330 m/s. Determine the density of air in kg/m^3 at the exit. A. 1.02 B. 1.82 C. 2.78 D. 4.022.2 A single stage single acting reciprocating air compressor is required to handle 30m3 of free air per hour measured at 1 bar. the delivery pressure is 6.5 bar and the s peed is 450 r. p.m allowing volumetric efficiency of 75%; an isothermal efficiency of 76% and mechanical efficiency of 80%. Determine 2.1.1 the indicated mean effective pressure and 2.1.2 the power required to drive the compressor.
- State if the listed statement is Ture (T) or False (F) and correct the false statement: 1. Thermodynamic is a science of energy 2. Closed system is also called control volume 3. Steam power plant cycle is employed to produce a mechanical and electrical energy 4. In a Carnot cycle, the isothermal process in a boiler and a condenser ( ) 5. Isobaric process means volume is constant 6. Isentropic process means adiabatic and reversible 7. Pump is a device that consumes energy 8. Compressor is a device that raises a pressure of incompressible fluid flow ( ) 9. Thermal efficiency means the output by input 10. Cycle means a group of process that has initial state and final state ( ) ( )02 A- Find internal energy and enthalpy of superheated steam at 100 bar and degree of superheating of 110 °C?0.20 .l 12:42 景令60 ... KB/s laung mateilais, (C) nquius, (u) gases: 9. Suppose a person stated that heat cannot be transferred in a vacuum. How do you respond? 10. Review any standard text on thermodynamics and define: (a) heat, (b) internal energy, (c) work, (d) enthalpy. 11. Define and discuss ge. LIST OF WORKED EXAMPLES 1-1 Conduction through copper plate 1-2 Convection calculation 1-3 Multimode heat transfer 1-4 Heat source and convection 1-5 Radiation heat transfer 1-6 Total heat loss by convection and radiation PROBLEMS 1-1 If 3 kW is conducted through a section of insulating material 0.6 m2 in cross section and 2.5 cm thick and the thermal conductivity may be taken as 0.2 W/m - °C, compute the temperature difference across the material. 1-2 A temperature difference of 85°C is impressed across a fiberglass layer of 13 cm thickness. The thermal conductivity of the fiberglass is 0.035 W/m - °C. Compute the heat transferred through the material per hour per unit area. 1-3 A…
- A factory uses superheated steam (P = 15 bar, T = 250 oC) for heating purposes of 20,000 tons/month. Steam is made in a boiler-furnace using 2 (two) types of fuel, namely coal fuel (LHV = 5500 kcal/kg) and heavy fuel oil (137129 Btu/ft3, density = 0.98 m3/kg) Question: a. How much coal fuel is needed to produce steam with the above specifications if the overall efficiency of the system (boiler-furnace = 75%)! b. How much heavy fuel oil is needed to produce steam with the above specifications (boiler-furnace = 75%)! answer every month... Help pleasee.. fast pleaseQ3. The data listed in the following table gives hourly measurements of heat flux q (cal/cm? /h) at the surface of a solar collector. As an architectural engineer, you must estimate the total heat absorbed by a 150,000-cm2 collector panel during a 14-h period. The panel has an absorption efficiency eab of 45%. The total heat absorbed is given by: h = eab q A where A = area and g = heat flux. 4 6. 10 12 14 0.10 5.32 7.80 8.00 8.03 6.27 3.54 0.20b) The compressor delivers gas at a constant pressure of p3 = 10bar to a tank via a valve with flow coefficient, C, = 5. The tank has a volume of 1.5m³. The air in the tank is initially at atmospheric pressure, and has the same temperature as the air exiting the compressor. Using the following valve flow rate equations, calculate the time required for the pressure in the tank to increase to 4 bar (abs). q = CyP3N (1– Ap 24p P3G,T3 3p3 If Ptank > P3/2. 1 If Ptank < P3/2. q = 0.471 C,p3N G,T Where N = 6950 when volumetric flow rate, q, has units = litres/min at standard conditions, temperature has units K, and pressure has units = bar (abs). Note that the specific gravity, Gg = (density of actual gas at standard conditions) / (density of air at standard conditions). c) The maximum volume of the compressor cylinder (i.e. V,) is 0.01m³. Calculate the rotational speed of the compressor required to deliver a mass flow rate of 0.2kg/s, and calculate the shaft power required to drive the…