Evaluation of the internal energy of steam - thermodynamics, Mechanical Engineering

Evaluation of the Internal Energy of Steam:

It is actual heat energy stored in steam above the freezing point of water.

We know enthalpy = internal energy + pressure energy

= U + PV,

here

U = internal energy of fluid PV = pressure energy of fluid
P = pressure of fluid

V = volume of fluid.

If 'U' is in kJ/kg, 'P' is in kN/m2  and 'V' is in m3/kg,

then U + PV denotes specific enthalpy is kJ/kg.       

[Specific enthalpy means enthalpy per unit mass] From above equation, we obtain

u = enthalpy - PV = H - PV kJ/kg,

here H = enthalpy per unit steam in kJ/kg.

(a) Internal energy of dry saturated steam can be given by

UDry  = HDry  - P.vkJ / kg,

where HDry (or hg) = enthalpy of dry saturated steam in kJ/kg.

vg  = specific volume of dry saturated steam in m3/kg, and

P = pressure of steam generation in kN/m2

(b) Internal energy of wet saturated steam can be given by

uwet  = Hwet  - P.Vwet  kJ/kg, where

Hwet  = enthalpy of wet saturated steam in kJ/kg

Vwet = specific volume of wet saturated steam in m3/kg

(c) Internal energy of superheated steam can be given by

usup  = Hsup  - P.vsup  kJ/ kg, where

Hsup = enthalpy of superheated steam in kJ/kg.

vsup  = specific volume of the superheated steam in m3/kg.

 

Posted Date: 10/15/2012 6:33:55 AM | Location : United States







Related Discussions:- Evaluation of the internal energy of steam - thermodynamics, Assignment Help, Ask Question on Evaluation of the internal energy of steam - thermodynamics, Get Answer, Expert's Help, Evaluation of the internal energy of steam - thermodynamics Discussions

Write discussion on Evaluation of the internal energy of steam - thermodynamics
Your posts are moderated
Related Questions
ES 347 - Thermodynamics Project Assigned: 3/28/2013 Due: 4/25/2013 Problem specification 5 kg of air is contained in a piston-cylinder device, initially at a pressure of 2MPa and a

If Motorcycle Starts but Stops Suddenly Causes of Problem Remedy The spark plug gets short-circuited by heating

Q. What do you mean by Stage Discharge Relationship? Regular recording of discharges over a period of time is essential for estimation of water resources of river basins and su

Compare otto cycle with Diesel cycle: Sol.: These two cycles can be compared on the basis of either the same compression ratio or the same maximum pressure and temperature.

what is principle of gyroscope



A 228 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of ki

Evaluation Phase of Radial drilling machine Steps: 1. To judge the ideas generated in the creation phase for ability to meet the required criteria. 2. To refine, develop

Split Queue Rules SPT*   Two queues prioritized as per to SPT. The operations for that t sj - u is negative form a high priority queue that is processed first. The order insid