Question

Air at temperature 15 degrees Celsius and the pressure 1 bar
enters and compresses to the pressure 15 bar at an isentropic
state.

Soon, it is heated to 1400 degrees Celsius and ΔV = 0. Then it is
allowed to expand isentropically to its initial state again.

Calculate what at the end of the expansion step and the compression
step the temperature will be. Also calculate the thermal efficiency
of the process. We can assume that the combustion engine work cycle
is worked by a Otto process.

Answer #1

Air at temperature 15 degrees Celsius and the pressure
1 bar enters and compresses to the pressure 15 bar at an isentropic
state. Soon, it is heated to 1400 degrees Celsius and ΔV = 0. Then
it is allowed to expand isentropically to its initial state again.
Calculate what at the end of the expansion step and the compression
step the temperature will be. Also calculate the thermal efficiency
of the process. We can assume that the combustion engine work...

air pressure of 103 kPa., entering the compressor at a
temperature of 15 degrees Celsius and a low speed. 1 mPa pressure,
336 degrees Celsius temperature and 106 m / s speed is coming out
of the compressor. The compressor is cooled by air at a temperature
of 15 degrees Celsius and 26 kW. The power input to the compressor
is 298 kW. (cp= 1.005kj/kgK , R=0.287 kj/kgK)
a) Find the mass flow of air
b) calculate the irreversibility in...

A) 1 kg of air with a pressure of 13 bar and a temperature of
125 ° C is heated as isobar up to 550 ° C.
a) Work done during heating,
b) Internal energy and enthalpy change,
c) Calculate the amount of heat consumed. (R = 287 j / kgK, x =
1,4)
B) An ideal gas with a pressure of 1 bar and a volume of 0.5m³
is compressed isothermally up to 17 bar pressure. Calculate the
volume...

The Assignment:
Water at a pressure of 15 bar at a temperature of 30°C enters a
boiler, where it is heated to 250°C at constant pressure. Steam
leaving the boiler passes into a throttle which reduces the
pressure to 10 bar. The steam is then passed through a small
turbine, exiting at atmospheric pressure at 110°C. Please draw a
schematic diagram. 1. How much heat is added per kg to the water by
the boiler? 2. Find the temperature of...

At the beginning of the compression process of an air-standard
Otto cycle, p1 = 1 bar and T1 = 300 K. The compression ratio is 6
and the heat addition per unit mass of air is 1500 kJ/kg.
Determine: (a) the maximum temperature of the cycle, in K. (b) the
net work, in kJ/kg. (c) the percent thermal efficiency of the
cycle. (d) the mean effective pressure, in kPa.

An open cycle gas turbine using a regenration arrangement. The
air enters the compressor at 1 bar 288 K and is compressed to 10
bar with compressor effieciency= 0.85. The air is heated in
regenerator and then enter in combustion chamber its temperature is
raised ny 1700 k and during the process the pressure falls by 0.2
bar. The air is then expanded in the turbine and passes to
regenerator which has 0.75 effectiveness and cause a pressure drop
of...

A single shaft gas turbine engine receives air at atmospheric
conditions of 14.7 psia and 80 degrees F. The compressor discharge
pressure is 103psia and the compressor efficiency is 87%. The
turbine inlet temperature is 1980 degrees F and the exhaust
temperature is 1173 degrees F. Assume a 3 psi pressure drop in the
combustion chamber and that inlet and exhaust ducts losses are both
27.7 inches of water. Find: a) Sketch the system and label the
state point locations...

1) An air-standard Otto cycle has a compression ratio of 9. At
the beginning of the compression process, the temperature is 20°C,
and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine
the cycle efficiency, work output, and the heat rejected
2) An air-standard Otto cycle operates with a minimum
temperature of 300 K and a maximum temperature of 1700 K. The
compression ratio of the cycle is 7. At the beginning of the
compression process, the...

1a. An air-standard cycle consists of the following processes:
isentropic compression from 15 ?C, 1.01 bar through a compression
ratio of 5:1; heat addition at constant volume of 2600 kJ/kg;
isentropic expansion to the initial volume; heat rejection at
constant volume. Sketch the cycle on p-v and T-s diagrams, and
calculate its ideal efficiency, mean effective pressure and peak
pressure.
Answers(0.475, 18.9 bar, 73.0 bar)
b. The cycle is problem (a) is modified so that the heat is
added
(a)...

10) An air-standard Otto cycle has a compression ratio of 9. At
the beginning of the compression process, the temperature is 20°C,
and the pressure is 100 kPa. The heat added is 500 kJ/kg. Determine
the cycle efficiency, work output, and the heat rejected.
11)An air-standard Otto cycle operates with a minimum
temperature of 300 K and a maximum temperature of 1700 K. The
compression ratio of the cycle is 7. At the beginning of the
compression process, the pressure...

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