LA regenerative vapour power cycle uses two closed feed-water heaters. The steam is supplied to the turbine at 40 bar, 500°C and is Turbines 1 hg Boler exhausted to condenser at 0.035 bar. The intermediate bleed pressures are obtained such that the saturation 12 <- m, kg intervals temperature approximately pressures of 10 and 1.1 bar. Determine the amount of steam are 1 kg Closed heater! ww 11 equal, giving Closed heater II ww Condenser 0.035 bar extracted at each stage, the work output of the plant per kilogram of the boiler stream and the cycle efficiency of the plant. Assume that the condensed steam from first feed-water heater is throttled to second water heater and from second water heater to condenser as shown in figure. feed 10 pump

LA regenerative vapour power cycle uses two closed feed-water heaters. The steam is supplied to the turbine at 40 bar, 500°C and is Turbines 1 hg Boler exhausted to condenser at 0.035 bar. The intermediate bleed pressures are obtained such that the saturation 12 <- m, kg intervals temperature approximately pressures of 10 and 1.1 bar. Determine the amount of steam are 1 kg Closed heater! ww 11 equal, giving Closed heater II ww Condenser 0.035 bar extracted at each stage, the work output of the plant per kilogram of the boiler stream and the cycle efficiency of the plant. Assume that the condensed steam from first feed-water heater is throttled to second water heater and from second water heater to condenser as shown in figure. feed 10 pump

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter47: High-pressure, Low-pressure, And Absorption Chilled-water Systems

Section: Chapter Questions

Problem 13RQ: The subcooling temperature in a condenser can be measured by taking the difference between the A....

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The subcooling temperature in a condenser can be measured by taking the difference between the A. suction pressure converted to temperature and the boiling refrigerant. B. boiling temperature and the condensing temperature. C. condensing temperature and the leaving-refrigerant temperature. D). condensing temperature and the entering-refrigerant temperature.
4. Ammonia enters the compressor of a refrigeration plant and is compressed from 190.2kPa, 98% dry to 972.2kPa with 50K of superheat. The refrigerant leaves the condenser as a liquid at 24°C and circulates with a mass flowrate of 5kg/min. Calculate: (a). compressor power (b). heat rejected in the condenser per minute (c). coefficient of performance (d). condition at entry to evaporator (e). plant capacity if enthalpy of fusion is 333kJ/kg Ans: 17.442kW, 6543kJ/min, 5.2522, 0.1536, 23.769tonne/day
A plant using R134a refrigerant has a cooling capacity of 352 kW of refrigeration. It evaporates at 0 Cand condenses at 35 C, with the 5 of superheat at the evaporator outlet and 5 K of sub-cooling at the condenser outlet. Assuming isentropic compression and ignoring pressure drops in the piping, the evaporator and condenser, determi the following; a) The refrigeration effect b) The mass flow rate of refrigerant ) The compressor power d) The rate of heatrejection at the condenser e) The COP 0 The corresponding Carnot COP g) The percentage Carnot-efficiency
8. A binary-vapour eycle operates on mercury and steam. Saturated mercury vapour at 4.5 bar is supplied to the mercury turbine, from which it exhaust at 0.04 bar. The mereury condenser generates saturated steam at 15 bar which is expanded in a steam turbine to 0.04 bar. (i) Find the overall efficiency of the ceycle. (ii) If 50000 kg/h of steam flows through the steam turbine, what is the flow through the mercury turbine ? (ii) Assuming that all processes are reversible, what is the useful work done in the binary vapour eyele for the specified steam flow ? (iv) If the steam leaving the mereury condenser is superheated to a temperature of 300°C in a super- heater located in the mercury boiler, and if the internal efficiencies of the mercury and steam tur- bines are 0.85 and 0.87 respectively, caleulate the overall efficiency of the eycle. The properties of saturated mercury are given below : p (bar) tCC) (kJ/ kg) (kJ / kg K) (m'/kg) 4.5 450 63.93 355.98 0.1352 0.5397 79.9 x104 0.068 0.04…
A reheater cycle is executed of 1 kg steam expanding initially from 12.547 Mpa and540.547 oC. The reheater pressures are 2.5547 Mpa and the steam leaves the reheaterat 420.547 oC. Condensation occurs at 0.02547 Mpa. Calculate W, ec and ee.
A reheater cycle is executed of 1kg steam expanding initially from 12.356 Mpa and 540.356oC. The reheater pressures are 2.5356 MPa and the steam leaves the reheater at 420.356oC. Condensation occurs at 0.02356 Mpa. Calculate W, ec and ee.
Steam is delivered to turbine at 5.4 MPa and 600 degree C. Before condensation at 31 degree C, steam is extracted for feed water heating at 0.6 MPa. The turbine exhaust is 60 degree C. the required values of some state point properties are tabulated below. 11. Calculate the thermal efficiency of the cycle
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A vapour compression refrigerator working with Freon-12 has its temperature range -10°C and 30°C. The Vapour enters the compressor dry and under cooled by 5°C in the condenser. For a capacity of 15 TOR, find: C.O.P Entropy Temp °C 30 -10 Enthalpy hf 64.59 26.87 Hfg 135.03 156.31 ng 199.62 183.19 Sf 0.24 0.108 Sg 0.6853 0.7019
A reheat cycle with two stages of reheating is executed, with steam expanding initially from 90 bar and 530°C. The two reheater pressures are 10 bar and 0.6 bar, and the steam leaves each reheater at 480°C. Condensation occurs at 0.03 bar. For an ideal cycle, find the e in %.
I need the workings ASP the answers are there questionn 4 4. A boiler produces 6 tonnes/hour of steam at a pressure of 1.8 MPa and a temperature of 250ºC.Feedwater enters at a temperature of 39ºC. At exit from the economizer part of the boiler thetemperature is 72ºC. At exit from the evaporator part of the boiler the steam is 90 % dry.Energy is supplied by 650 kg of coal per hour, which has a calorific value of36 MJ/kg. The A/F ratio is 25 : 1. The temperature of the flue gas at entry to the economizerpart of the boiler is 430ºC. The average specific heat at constant pressure of the flue gas inthe economizer is 1045 J/kg.K.4.1 Calculate the efficiency of the boiler. [70.5 %] this one is the answer 4.2 Draw up an energy balance, on a kJ/kg coal basis, with percentages of the total energysupplied. [economizer 3.6 %, evaporator 59 %, superheater 8 %,other 29.4 %]
In a steam turbine plant steam expands in the high pressure turbine from 5000kPa, 500°C to 500kPa with an isentropic efficiency of 0.9. It is then reheated isobarically to 500°C before entering the low pressure turbine. In the low pressure turbine the steam expands to dry saturated, 5kPa. The condensate leaves the condenser with 4° of undercooling. Determine: (a). the condition of the high presfsure turbine exhaust (b). the isentropic efficiency of the low pressure turbine (c). the specific steam consumption for a turbine output power of 7.5MW (d). the Rankine efficiency including the feed pump