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Maritime Forum

Topics in Category: Heat engine

emo
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Topic started 19 Jan 2012 19:09 by anandgardener
An engine working on the Dual-Combustion cycle has a compression ratio of 10 and initial temperature and pressure are 1000C and 1 bar. If maximum pressure attained is 70bar and the energy supplied/kg air is 1675 kJ, determine the ideal efficiency. CP = 1.005, CV =0.718kJ/kgK.
emo
Views: 237
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Topic started 19 Jan 2012 19:09 by anandgardener
An ammonia refrigerating plant operates between temperature units of – 120C and 260C. Vapour leaving the compressor is dry saturated and at entry has a dryness fraction of 0.9. Find the cylinder dimensions of the double acting compressor of volumetric efficiency 80% at 200 rev/min. to give a...
emo
Views: 222
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Topic started 19 Jan 2012 19:08 by anandgardener
(a) Prove that the work done in a single acting air compressor is given by n / n – 1 (P1V1 – P2V2) Where P1 and V1 refer to the initial conditions. P2 and V2 refer to the final conditions. n is the index of adiabatic compression. (b) A single stage, single acting, reciprocating air...
emo
Views: 313
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Topic started 19 Jan 2012 19:08 by anandgardener
Steam issues from nozzles inclined at an angle of 220 to the direction of motion, with a velocity of 680 m/s on to the blades of a single stage impluse turbine. The mean diameter of the blade ring is 1.25m. The blade angles without shock and that the flow over the blades is frictionless, determine:...
emo
Views: 281
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Topic started 19 Jan 2012 19:08 by anandgardener
0.5 kg of air is taken through a constant pressure cycle. Conditions at the beginning of adiabatic compression are 0.965 bar and 150C. The pressure ratio of compression is 6. Constant pressure heat addition occurs after adiabatic compression until the volume is doubled. If =1.4 and R =...
emo
Views: 216
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Topic started 19 Jan 2012 19:07 by anandgardener
A certain fuel consists of 86 % carbon and 14 %, hydrogen by mass. If the fuel is burnt with 20 %, excess of air and the combustion is complete, estimate the volumetric Composition of the products of combustion including the water Vapour formed. Assume air contains 23 % of Oxygen by mass.
emo
Views: 226
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Topic started 19 Jan 2012 19:07 by anandgardener
In a simple gas turbine working on the ideal cycle, the pressure ratio of both the compressor and turbine is 4.3:1. The temperature at inlet to the compressor and inlet to the turbine are 160C and 6000C respectively. Calculate :- (a) Net output of the turbine for 1 kg/sec. mass flow. (b) The...
emo
Views: 290
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Topic started 19 Jan 2012 19:07 by anandgardener
A steam pipe 140mm outside diameter and 25m long is lagged with insulating material of thermal conductivity 0.13W/mK. Steam passes along the pipe at the rate of 1200 kg/h, entering at 18 bar dry saturated and leaving at the same pressure. Thickness of the lagging is 31 mm and the outside temperature...
emo
Views: 265
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Topic started 19 Jan 2012 19:06 by anandgardener
0.25 kg of' air at a pressure of 1.40 bar occupies 0.15m3 and from this condition it is compressed to 14 bar according to the law PV1.25 =C. Determine - (a) the change of internal energy of the air. (b) the work done in compressing the air. Take CP = 1.0005 kJ/kgK, Cv = 0.718 kJ /kgK.
emo
Views: 238
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Topic started 19 Jan 2012 19:05 by anandgardener
In an open circuit, continuous combustion, constant pressure gas turbine takes in air at 20OC and compresses it to 6 times the intake pressure in a rotary compressor whose isentropic efficiency is 82%. A heat exchanger then transfers 70% of the heat available for this purpose, from the turbine...
emo
Views: 275
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Topic started 19 Jan 2012 19:05 by anandgardener
The following particulars relate to a two-row velocity compounded impulse wheel Steam velocity at nozzle outlet = 650 m/s Mean blade velocity = 125 m/s Nozzle outlet angle = 16O Outlet angle, first row of moving blades = 18O Outlet angle, fixed guide blades = 22O Outlet angle, second row of...
emo
Views: 212
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Topic started 19 Jan 2012 19:05 by anandgardener
The wall of a cold room consists of a layer of cork sandwiched between outer and inner walls of wood, the wood walls being each 32mm thick. The inside atmosphere of the room is maintained at – 22OC when the external atmospheric temperature is 27OC, and the heat loss through the wall is 45 W/m2....
emo
Views: 258
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Topic started 19 Jan 2012 19:04 by anandgardener
In a single acting air compressor, the clearance volume is 5% of the swept volume. Diameter of the cylinder is 220 mm, stroke 250 mm, and it runs at 2.5 rev/s. It receives air at 1 bar and delivers it at 5.5 bar, the index of compression and expansion being 1.28. Calculate: - (a) the indicated...
emo
Views: 277
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Topic started 19 Jan 2012 19:04 by anandgardener
A waste-heat boiler is placed in the exhaust system of a gas engine which develops 3000KW, using gas whose lower or net calorific value is 17880 KJ/m3 at 0OC and 1.01325 bar. The residual waste of combustion is 0.3 kg/m3 and the relative density of the gas is 0.45 referred to air. The overall...
emo
Views: 229
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Topic started 19 Jan 2012 19:04 by anandgardener
Steam is expanded isentropically in the first stage of a turbine from 50 bar 450OC to 2.0 bar. It is then passed through a re-heater and its temperature is raised to 300OC at constant pressure of 2.0 bar. The steam now passes through the final stage and is expanded isentropically to 0.055 bar....
emo
Views: 236
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Topic started 19 Jan 2012 19:03 by anandgardener
The internal volume of a starting air receiver of an auxiliary diesel engine is 15 m3. When filled it contains 2.0 m3 of free air at engine room condition of 1.03 bar and ambient temperature of 25OC. The air is compressed according to the law PVl.3 = constant. Find: - (a) the final temperature and...
emo
Views: 295
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Topic started 19 Jan 2012 19:03 by anandgardener
The ratio of compression of an engine working on the constant volume cycle is 9.6: 1. At the beginning of compression the pressure is 1.013 bar and temperature is 30OC. At the end of heat supply at constant volume the temperature is 1700OC. Taking index of compression and expansion as 1.4....
emo
Views: 268
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Topic started 19 Jan 2012 19:02 by anandgardener
In a Freon-12 refrigerating plant the compressor takes the refrigerant in at 0.6417 bar and discharges at 13.66 bar and 70OC. At condenser outlet the Freon is saturated liquid at 13.66 bar without under-cooling. The flow of the refrigerant is 15 kg/min. Calculate the refrigerating effect and the...
emo
Views: 292
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Topic started 19 Jan 2012 19:02 by anandgardener
A certain gas has a density of 1.38 kg/m3 at 1.01325 bar and 100C. When 0.05 m3 of this gas at 1.5 bar and 270 is compressed adiabatically to a temperature of 1040 C the work done is 4736 J. Calculate:- (a) the characteristic gas constant R, (b) the specific heat of the gas' at constant volume and...
emo
Views: 297
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Topic started 19 Jan 2012 19:01 by anandgardener
Steam is supplied to a turbine at 40 bar, 3500C and the condenser pressure is 0.04 bar. The power developed is 6 MW when the steam consumption is 26.5 tonnes/h. Calculate:- (a) the ideal efficiency of the Rankine Cycle, (b) the actual efficiency of the engine, (c) the efficiency ratio, (d) the...
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