The following data was recorded during a test performed on a steam plant consisting of a Lancashire boiler, economiser and a superheater. Steam generated = 5,000 kg/hr at 14 bar pressure %3D Mass of coal burnt = = 670 kg/hr Calorific value of coal = 29500 kJ/kg %3D Temperature of feed water at entry and exit of economiser = 30°C and 130 C respectively. Temperature of steam leaving the superheater = 320 °C. Dryness fraction of steam leaving the boiler = 0.97 C, (superheated steam) = 2.3 kJ/kg-K Cp (water) = 4.18 kJ/kg-K %3D Calculate: (1) Factor of evaporation. (2) Overall efficiency of the plant.

The following data was recorded during a test performed on a steam plant consisting of a Lancashire boiler, economiser and a superheater. Steam generated = 5,000 kg/hr at 14 bar pressure %3D Mass of coal burnt = = 670 kg/hr Calorific value of coal = 29500 kJ/kg %3D Temperature of feed water at entry and exit of economiser = 30°C and 130 C respectively. Temperature of steam leaving the superheater = 320 °C. Dryness fraction of steam leaving the boiler = 0.97 C, (superheated steam) = 2.3 kJ/kg-K Cp (water) = 4.18 kJ/kg-K %3D Calculate: (1) Factor of evaporation. (2) Overall efficiency of the plant.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

b) The high pressure units on a steam plant operate at 10bar (gauge), and the condensate is sub-cooled by 9.5K. If the mass flow rate of condensate is 10 kg/s, use the provided steam tables to determine how much saturated steam at 1.5 bar this condensate could produce. Note it is sufficiently accurate for high pressure condensate, as in this question, to assume that the specific enthalpy is the same as for the saturated liquid at the same temperature.
12.) Water at a rate of 1 lbm/s flows in a vertical heated tube (d = 1.5 in). Systempressure is 1250 psia. Find heat flux at a point where steam quality is 15% andsurface superheat is 12 F. [Ans.: q′′ = 108 kW/m2]
See attached photo... need help with part 2
b) 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…
Completely solve and box the final answers. Write legibly. 6. Calculate the power in Kw required to drive the second stage of a double-acting two-stage compressor that delivers air at 300 psi. The air enters at 30 ft3/sec with a condition of 30°C and 1.030 bar. The compressor is designed for minimum work with complete intercooling using PV1.30 = C.
16.40 A gas engine working on the constant-volume cycle gave the following results during a one-hour test run. Cylinder diameter 24 cm; stroke 48 cm; torque 770 Nm; average speed 220 rpm; average explosion per minute 77; mep 7.5 bar; volume of gas used 12 m³ at 17 °C and 770 mm of mercury pressure; lower calorific value of gas 21 MJ/m3 at NTP; inlet and outlet temperature of cooling water are 25 °C and 60 °C respectively; cooling water used 600 kg. Determine (i) the mechanical efficiency (ii) the indicated specific gas consumption in m3/kW h and (iii) the indicated thermal efficiency. Draw up a heat balance for the engine on minute basis, explaining why friction power has been included in or omitted from your heat balance. NTP conditions are 760 mm of Hg and 0 °C.
2. (#47ppS-37TrD) - A water tube boiler evaporated 6.05 kg of water per sec from a feed water temperature of 104.44 deg C to steam at 1241 kPa and quality of 0.97, weight of coal fuel per sec 0.57 kg, high heat value of the coal as fired, 11,800 Btu/lb Steam Properties: At 104.44 deg C hf At 1241.1 kPa = 437.78 (interpolated) h₁ = 805.29 = hg 1980.6 (interpolated) a) Determine the rate of heat absorption in kJ/kg
1. A steam turbine system has a boiler pressure of 40 bar and the emergent steam is superheated to 500°C. The condenser pressure is 0.04 bar. If the expansion and compression stages have ideal efficiency, (i) What is the thermal efficiency, dryness fraction and specific steam consumption of the cycle considered, If the cycle is having one reheat stage to the superheat temperature? What is the thermal efficiency, dryness fraction and specific steam consumption of the cycle considered, if the cycle is having one bleed point (open heater) at the pressure where the steam become saturated after first expansion? (ii)
Solve it correctly ASAP
Q3// A 3-MW steam power plant have a water tubes boiler of the following specification: Steam production 9000 kg/h Steam pressure 15 bar Steam temperature 300 "C Dryness fraction of steam in the steam drum 0.9 Feed water temperature 313K Water leaving economizer heating value of the fuel Fuel consumption Flue gas temperature Flue gas density Flue gas specific heat Boiler house temperature 115 "C 31 MJ/kg 1000 kg/h 160 "C 1.15 kg/m³ 1.11 kJ/kg.K 20 "C 1.24 m Chimney diameter Velocity of flue gases leaving the chimney 3 m/s 1. Determine the overall efficiency, boiler efficiency, and equivalence evaporation. 2. Draw the heat balance sheet for the boiler (all in kW). 3. State the requirements of good steam generator. Answ(83.35%, 11.45kgs/kgf, 34.84%, 8611.11kW, 787.5kW, 5280.7kW, 1109.05kW, 647.4kW)
An ideal heat engine operates in a cycle and produces work as a result of heat transfer from a thermal reservoir at an elevated temperature Tŉ and by rejecting energy to a thermal sink at Tc. The efficiency for such an ideal cycle, termed a “Carnot cycle," is n = 1 Determine the required uncertainty in the measurement of temperature to yield an uncertainty in efficiency of 1%. Assume that errors are uncorrelated. Use Th = 313 K and Tc = 293 K.
5.10 Gas turbine exhaust of Ex. 5.1 is employed in a waste heat recovery boiler to raise steam at p= 66 bar and t= 540°C. The steam expands to a condenser pressure of 0.1 bar and dryness fraction 0.90. Taking a pinch-point of 20°C determine. (a) The steam boiler capacity, (b) Temperature of the gases in the stack, (c) Steam turbine efficiency, (d) Steam turbine plant output and efficiency, and (e) Efficiency of the combined cycle plant. (Ans.) (a) 212 tonnes/h (b) 167.60°C (d) 69.52 MW, 35.35% (c) 88.72% (e) 45.2%