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A 4 cylinder Otto cycle engine has a compression ratio of 8.

A 4 cylinder Otto cycle engine has a compression ratio of 8. Inlet air is at 100 kPa and 17°C, and 300 kJ/kg of heat is transferred to the engine. Determine (a) the maximum temperature and pressure that occur during the cycle,

(b) the net work output,

(c) the exhaust gas temperature

(d ) the mean effective pressure for the cycle. 

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Thermodynamics is a physical science that studies the effects on material bodies, and on radiation in regions of space, of transfer of heat and of work done on or by the bodies or radiation. It interrelates macroscopic variables, such as temperature, volume and pressure, which describe physical properties of material bodies and radiation, which in this science are called thermodynamic systems.

What is the first Law of Thermodynamics?

The first law of thermodynamics states that the total energy of the isolated system is conserved. The energy may change from one form to another, but the total energy of the isolated system is constant. The different forms of energy are:

Heat and work.

It states that energy can be transformed from one form to another.

For a cyclic system, the first law of thermodynamics is stated by Rudolf Claussius as

In all cases in which work is produced by the agency of heat, a quantity of heat is consumed which is proportional to the work done; and conversely, by the expenditure of an equal quantity of work an equal quantity of heat is produced.

dQ=dW  for cyclic process

The existance of internal energy is realised from the first law of thermodynamics for non cyclic processes.

The first law for non cyclic systems can be stated as

The change in internal energy of the sysstem is equal to the difference between the net heat and work interactions.

dE = dQ-dW for non cyclic process.

The First Law of Thermodynamics is essentially a statement of conservation of energy. It involves changes in internal energy, the heat flowing into the system and the work done by the system. When heat flows into the system, the internal energy of the system increases. When positive work is done by the system, the system loses internal energy.

Keywords: 4 cylinder Otto cycle engine, Otto cycle engine, Thermodynamics, First Law of Thermodynamics, Engineering, Mechanical Engineering, Physics