That is Work Done (W) Time (T) x Rate of Work (R). Nm/kg J/kg m 2 /s 2 Specific Work of a Pump or Fan. The basic formula for work done in a given time is equal to the product of time and rate of work. Specific work in turbo machines as fans, pumps, compressors or turbines has the SI-units. Further movement piston towards the top dead center cause the compressed air to discharge. Calculate specific work done by pumps, fans, compressors or turbines.
When the pressure inside the cylinder reaches p 2, the discharge valve opens. Work done during isothermal compressionThe line AB represents suction of fluid, area under AB (ie ABB'A') represent work done during the suction processīC 1 represent compression of fluid when piston moving from bottom dead center to top dead center. As we can see from above, the formula of work done involves the dot product of force and. P 2, v 2, T 2 are the corresponding pressure, volume, and temperature after compression. (theta ) is the angle between the force and displacement vectors. Let p 1= Suction pressure (pressure before compression) The compression process may be isentropic, polytropic, or isothermal The following figure shows the PV and TS diagram of this compressor. P W/t: Unit : The SI unit of power is Watt (W). Power: Definition: Power is defined as the rate at which work is done. But the work for the constant pressure process is greater than the work for the curved line process. Using either process we change the state of the gas from State 1 to State 2. Small amount of work done by torque in turning the body through a small angle d is given by dW d. mgh: Unit : The SI unit of energy is Joules (J). The work done in this process is shown by the yellow shaded area. write down the formula for the workdone in rotatory motion. Mathematically the work done by the reciprocating compressor is equal to the work done by compressor during compression and discharge minus the work done during the suction of fluid.Ĭonsider a single stage, single acting reciprocating compressor without clearance volume. Formula: The energy stored in an object due to its position and height is known as potential energy and is given by the formula: P.E. of 1 volt is applied o the ends of a conductor and I coulomb of electricity passes through. thus there are three work is included in a cycle of reciprocating compressor, work of piston during the suction of fluid/ refrigerant, work of piston during the compression of fluid as well as work during the discharge of compressed fluid. From the definition of the volt (page 405), it follows that if a p.d. The working of reciprocating compressor includes three operations, suction, compression, and discharge of compressed fluid. Read: Working of reciprocating compressor