Example of change of enthalpy, Mechanical Engineering

Assignment Help:

Example of change of enthalpy:

Q 0.5kg/s of a fluid flows in steady state process. The properties of fluid at the entrance are measured as p1 = 1.4bar, density = 2.5kg/m3, u1 = 920Kj/kg while at exit properties are p= 5.6 bar, density = 5 kg/m3, u2 = 720Kj/kg. The velocity at entrance is 200m/sec, while at exit it is 180m/sec. It rejects 60kw of heat and rises through 60m during the flow. Find change of enthalpy and rate of work done.     

Sol: Given that:

mf  = 0.5kg/s

P1  = 1.4bar, density = 2.5kg/m3,

u1  = 920Kj/kg

P2  = 5.6 bar, density = 5 kg/m3,

u2  = 720Kj/kg. V1  = 200m/sec

V2  = 180m/sec Q = - 60kw

Z2  - Z1  = 60m h = ?

WS  = ?

Since           h2 - h1  =   U +   P

h2 - h1  = [U2  - U1    + (P2/  2  - P1/   1)]

= [(720 -920) × 103  +   (5.6/5 - 1.4/2.5) × 105]

= [-200 × 103  + 0.56 × 105] = - 144KJ/kg

H =  mf  × (h2 - h1) = 0.5 × (-144) Kj/kg = -72KJ/sec                    .......ANS

By Applying SFEE

84_Isentropic flow through the nozzle3.png

60 × 103  - WS  = 0.5[ - 144 × 103  + (1802  - 1002)/2 + 9.81 × 60]

WS  = 13605.7 W = 136.1KW                    .......ANS


Related Discussions:- Example of change of enthalpy

Generation of steam at constant pressure - thermodynamics, Generation of st...

Generation of steam at constant pressure: Steam is pure substance. Like any other pure substance it can also be converted into any of the three states, that is, solid, liquid

Crankshaft design, i have designed a crankshaft for 3 cylinder engine i wan...

i have designed a crankshaft for 3 cylinder engine i want to know how to balance it

Manufacturing technology, Details of rolling process,Different rolling meth...

Details of rolling process,Different rolling methods,

Basic troubleshooting of motorcycle, Basic Troubleshooting of Motorcycle we...

Basic Troubleshooting of Motorcycle we have studied about the basic troubles in motorcycle operation and their solutions. It will help you in finding out the problem with the vehic

Newton s rings, how i make assigment for newton s ring

how i make assigment for newton s ring

Calculate drilling speed and machining time, Calculate Drilling Speed and M...

Calculate Drilling Speed and Machining Time Calculate the drilling speed if a 50 mm dia hole of 60 mm depth is to be drilled in a M.S. component. The feed rate is 0.2652 and M

How cad system communicate with control system, How CAD system communicate ...

How CAD system communicate with control system The concept of a universal data exchange system is depicted in figure. In this figure, it is shown how various CAD systems commun

Eng chemistry, write notes on internal treatement of water

write notes on internal treatement of water

THERMODYNAMICS, COMPRESSOR MOSTLY USED FOR SUPERHEATING OF IC ENGINES IS CA...

COMPRESSOR MOSTLY USED FOR SUPERHEATING OF IC ENGINES IS CALLED ----------COMPRESSORS

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd