![contoh soal gas ideal contoh soal gas ideal](https://4.bp.blogspot.com/-S9EcZgyyHHM/WK5SOtabIUI/AAAAAAAAAbs/d8vmm-RadWQEgFhk0ucUNKrRW-P4QAoSQCLcB/s1600/4.png)
i = (Ideal change in enthalpy)/(Actual change in enthalpy) hi = (Ideal change in temperature)/(Actual change in temperature) Remember that friction always produces a smaller change in temperature than for the ideal case. THE EFFECT OF FRICTION ON THE JOULE CYCLE 3.1 TURBINE The isentropic efficiency for a gas turbine is given by: i = (Actual change in enthalpy)/(Ideal change in enthalpy) i = (Actual change in temperature)/(Ideal change in temperature) 3.2 COMPRESSOR For a compressor the isentropic efficiency is inverted and becomes as follows. After constant pressure heating, the pressure and temperature are 7 bar and 700oC respectively. The inlet pressure and temperature to theĬompressor are respectively 1 bar and -10oC. SELF ASSESSMENT EXERCISE No.2 A gas turbine uses the Joule cycle. The temperature at inlet to the turbine is 950oC. WORKED EXAMPLE No.2 A gas turbine uses the Joule cycle. This shows that the efficiency depends only on the pressure ratio which in turn affects the hottest temperature in the cycle. Rp is the pressure compression ratio for the turbine and compressor. It is easy to show that the temperature ratio for the turbine and compressor are the same. It assumed that the mass and the specific heats are the same for the heater and cooler.
![contoh soal gas ideal contoh soal gas ideal](https://image2.slideserve.com/5149924/energi-dalam-gas-ideal-l.jpg)
3a, 3b and 3c respectively.įig 3a p-V diagram Fig 3b p-h diagram Fig 3c T-s diagramĢ.1 EFFICIENCY The efficiency is found by applying the first law of thermodynamics. The pressure - volume, pressure - enthalpy and temperature-entropy diagrams are shown on figs. Pout = H/s = m cp (T3-T4) 4 - 1 Constant pressure cooling back to the original state requiring heat removal. Pin= H/s = m cp (T2-T1) 2 - 3 Constant pressure heating requiring heat input.ģ - 4 Reversible adiabatic (isentropic) expansion producing power output. 1 - 2 Reversible adiabatic (isentropic) compression requiring power input.
![contoh soal gas ideal contoh soal gas ideal](https://slidetodoc.com/presentation_image_h/fc397962ce3441313d4f69b3bdf1df04/image-31.jpg)
There are 4 ideal processes in the cycle. The cycle in block diagram form is shown on fig. THE BASIC GAS TURBINE CYCLE The ideal and basic cycle is called the JOULE cycle and is also known as the constant pressure cycle because the heating and cooling processes are conducted at constant pressure. Calculate the exhaust temperature and the power output. A gas turbine expands 7 kg/s of air from 9 bar and 850oC to 1 bar adiabatically with an
![contoh soal gas ideal contoh soal gas ideal](https://image.slidesharecdn.com/teorikinetikgas-140603064104-phpapp01/95/contoh-soal-dan-pembahasan-teori-kinetik-gas-1-638.jpg)
A gas turbine expands 3 kg/s of air from 10 bar and 920oC to 1 bar adiabatically withĪn isentropic efficiency of 92%. A gas turbine expands 6 kg/s of air from 8 bar and 700oC to 1 bar isentropically.Ĭalculate the exhaust temperature and the power output. WORKED EXAMPLE No.1 A gas turbine expands 4 kg/s of air from 12 bar and 900oC to 1 bar adiabatically withĪn isentropic efficiency of 87%. An alternative way of expressing this is with POLYTROPIC EFFICIENCY For a compression from (1) to (2) the temperature ratio is expressed as follows.Ģ12 ppTT and for an expansion from (1) to (2)Ģ12 ppTT where is called the polytropic efficiency. is = T (actual)/T(ideal) for an expansion. The temperature change is T2 - T1 If there is friction the isentropic efficiency (is) is expressed as is = T (ideal)/T(actual) for a compression. Always remember that when a gas is expanded it gets colder and when it is compressed it gets hotter. The same formula may be applied to a compression process. When a gas is expanded from pressure p1 to pressure p2 adiabatically, the temperature ratio REVISION OF EXPANSION AND COMPRESSION PROCESSES. GAS TURBINE POWER CYCLES In this tutorial you will do the following.Įxtend the work to cycles with heat exchangers.ġ.