1 / 16

Laws of Thermodynamics 1

Laws of Thermodynamics 1. Disusun Oleh : Ichwan Aryono, S.Pd. First law of thermodynamics. First Law of thermodynamics states that :

shenam
Download Presentation

Laws of Thermodynamics 1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Laws ofThermodynamics 1 Disusun Oleh : Ichwan Aryono, S.Pd.

  2. First law of thermodynamics First Law of thermodynamics states that : Whenever heat Q is given to a system, a portion of heat is used to increase its internal energy in the amount of DU, whereas the remaining leaves the system when the system performs a work W to its surroundings. Mathematically, the first law of thermodynamics is formulated by : Q = DU + W Q>0 W positip jika sistem melakukan usaha W negatip jika sistem dikenai usaha Q positip Jika sistem menerima kalor Q negatip jika sistem melepas kalor Energi dalam DU tidak terpengaruh oleh proses, yang dilihat adalah hanya pada keadaan awal dan keadaan akhir W>0 W<0 Q<0

  3. The first law of thermodynamics for isothermal process At isothermal Process : DT = 0, so DU = 0 The work done by the isothermal process is : so Q = DU + W = 0 + W = W Q =

  4. The first law of thermodynamics for isobaricprocess At isobaric process the pressure is constant DP = 0 Internal energy , so

  5. The first law of thermodynamics for isochoric process At Isochoric process volume is constant, DV = 0, so the work done W = PDV = 0, its produce :

  6. The first law of thermodynamics for adiabatic process Adiabatic process is a process without any transfer of heat into or from the system (Q=0)and it applies :

  7. Student Activity #1 A system absorbs 1500 J of heat from surrounding and does work done 2200 J . Determine the change of internal energy system, increases or decreases ?

  8. Student Activity #2 System absorbs 1500 J of energy from surrounding. At the same time 2200 J work done is given to the system. Determine the change of internal energy of the system. Is temperature decreses or increases ?

  9. Student Activity #3 Two mol of ideal gas is expans from point I to point F with three difference way as shown in diagram below. Calculate the work done, change of internal energy, and calor in each way IAF, IF and IBF, state in joule P(atm) A 4 I B F 1 V(L) 2 4

  10. Student Activity P(Pa) Four mol of ideal gas in cylinder container change its conditional as shown in graphic P-V beside. Determine the work done, internal energy and calor if the gas is change from A to C thrue (a) ABC, (b) AC A B 500 C 200 V(cm3) 0 800 500 300

  11. Student Activity #5 • Three different processes act on system. • In process A, 42J of work are done on the system and 77J of heat are added to the system. Find the change in the system’s internal energy. • b. In process B. the system does 42 J of work and 77J of heat are added to the system. What is the change in the system’s internal energy ? • c. In process C, the system’s internal energy decreases by 120 J while the system performs 120 J of work on its surroundings. How much heat was added to the system ?

  12. Student Activity #6 An ideal gas is taken through the four processes shown in figure below. The changes in internal energy for three of these processes are as follows : DUAB = + 82 J, DUBC = +15 J, DUDA = -56 J. Find the change in internal energy for the process from C to D D C pressure A B volume

  13. Student Activity # 7 a. Find the work done by a monoatomic ideal gas as it expands from point A to point C along the path shown in figure below. b. If the temperature of the gas is 220K at point A, what is its temperature at point C ? c. How much heat has been added to or removed from the gas during this process ? B 600 400 Pressure P(kPa) A C 200 Volume, V(m3) 0 2 4 6 8 10

  14. Student Activity #8 • During an adiabatic process, the temperature of 3.52 moles of monoatomic ideal gas drops from 485oC to 205oC. For this gas, find • The work it does • The heat it exchanges with its surroundings, and • The changes in internal energy

  15. Student Activity #9 • An ideal gas follows the three-part process shown in figure below. At the completion of one full cycle, find • The net work done by the system • The net change in internal energy of the system • The net heat absorbed by the system A 150 Pressure P(kPa) 100 B 50 C 1 2 0 3 4 Volume, V(m3)

  16. Quiz • Suppose 57.5 moles of an ideal monoatomic gas undergoes the series of processes shown in figure below. • Calculate the temperature at the points A, B, and C. • For each process, A-B, B-C, and C-A, state whether heat enters or leaves the system, Explain in each case. • Calculate the heat exchanged with the gas during each of three process. A 150 Pressure P(kPa) 100 B 50 C 1 2 0 3 4 Volume, V(m3)

More Related