This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: CHEG 2313 Thermo I HW#6 Spring 2011 Due Wednesday, March 9, 2011 by 5pm. 1. A process produces power by expanding 1.3 kg/s of steam from 500C and 3.5 MPa to 250C and 3000 kPa. A breakdown in insulation around the process allows a heat loss of 30 kJ per kg of steam. a) How much power can be produced from this process? (5 pts) system: process start with mass balance since steady state M M M out in = = next energy balance . . 1 2 . 2 2 2 W Q gh H M gh M U dt d k K k k + + + + = + + =  steady state and no kinetic or potential energy changes reduced energy balance . . 2 1 . W Q H H M + +  =  determine enthalpy values from steam tables ( 29 kg kJ MPa C H 9 . 3450 5 . 3 , 500 1 = ( 29 kg kJ MPa C H 8 . 2855 3 , 250 2 = solve for work ( 29 kW s kJ W s kg kg kJ kg kJ s kg Q H H M W 6 . 734 6 . 734 3 . 1 30 9 . 3450 8 . 2855 3 . 1 . . 1 2 . . = =  =  = b) If the heat is being transferred at 350C, is this process possible? (5 pts)  entropy equation gen k k S T Q S M dt dS + + = ....
View
Full
Document
This note was uploaded on 04/01/2011 for the course CHEG 2313 taught by Professor Staff during the Spring '11 term at Arkansas.
 Spring '11
 STAFF

Click to edit the document details