{
"metadata": {
"name": "",
"signature": "sha256:071044d67259dbca809a68700f00a2b22bbcf445c19f6ea5840022a417d2395b"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 9 - Properties of the pure substance"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1 - Pg 149"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the Internal energy\n",
"#Initialization of variables\n",
"T=32 #F\n",
"m=1 #lbm\n",
"J=778.16\n",
"#calculations\n",
"print '%s' %(\"From steam tables,\")\n",
"hf=0 \n",
"p=0.08854 #psia\n",
"vf=0.01602 #ft^3/lbm\n",
"u=hf-p*144*vf/J\n",
"#results\n",
"print '%s %.7f %s' %(\"Internal energy =\",u,\" Btu/lbm\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From steam tables,\n",
"Internal energy = -0.0002625 Btu/lbm\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2 - Pg 149"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the Change in entropy\n",
"#Initialization of variables\n",
"P=40 #psia\n",
"#calculations\n",
"print '%s' %(\"from steam tables,\")\n",
"hf=200.8 #Btu/lbm\n",
"hg=27 #Btu/lbm\n",
"T=495. #R\n",
"ds=(hf-hg)/T\n",
"#results\n",
"print '%s %.3f %s' %(\"Change in entropy =\",ds,\"Btu/lbm R\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"from steam tables,\n",
"Change in entropy = 0.351 Btu/lbm R\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3 - Pg 149"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the specific enthalpy\n",
"#Initialization of variables\n",
"x=0.35\n",
"T=18. #F\n",
"#calculations\n",
"print '%s' %(\"From table B-14,\")\n",
"hf=12.12 #Btu/lbm\n",
"hg=80.27 #Btu.lbm\n",
"hfg=-hf+hg\n",
"h=hf+x*hfg\n",
"#results\n",
"print '%s %.1f %s' %(\"specific enthalpy =\",h,\"Btu/lbm\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From table B-14,\n",
"specific enthalpy = 36.0 Btu/lbm\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4 - Pg 149"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the heat required\n",
"#Initialization of variables\n",
"x=0.35\n",
"T=18 #F\n",
"T2=55.5 #F\n",
"#calculations\n",
"print '%s' %(\"From table B-14,\")\n",
"hf=12.12 #Btu/lbm\n",
"hg=80.27 #Btu.lbm\n",
"hfg=-hf+hg\n",
"h=hf+x*hfg\n",
"h2=85.68 #Btu/lbm\n",
"dh=h2-h\n",
"#results\n",
"print '%s %.2f %s' %(\"Heat required =\",dh,\"Btu/lbm\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From table B-14,\n",
"Heat required = 49.71 Btu/lbm\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5 - Pg 149"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the enthalpy and Quality\n",
"#Initialization of variables\n",
"P=1460. #psia\n",
"T=135. #F\n",
"P2=700. #psia\n",
"#calculations\n",
"print '%s' %(\"From mollier chart,\")\n",
"h=120 #Btu/lbm\n",
"x=0.83\n",
"#results\n",
"print '%s %d %s' %(\"enthalpy =\",h,\"Btu/lbm\")\n",
"print '%s %.2f' %(\"\\n Quality =\",x)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From mollier chart,\n",
"enthalpy = 120 Btu/lbm\n",
"\n",
" Quality = 0.83\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6 - Pg 149"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the Heat transferred\n",
"#Initialization of variables\n",
"m=1 #lbm\n",
"P1=144. #psia\n",
"P2=150. #psia\n",
"T1=360. #F\n",
"J=778.16\n",
"#calculations\n",
"print '%s' %(\"From table 3,\")\n",
"v1=3.160 #ft^3/lbm\n",
"h1=1196.5 #Btu/lbm\n",
"u1=h1-P1*144.*v1/J\n",
"h2=1211.4 #Btu/lbm\n",
"u2=h2-P2*144.*v1/J\n",
"dq=u2-u1\n",
"#results\n",
"print '%s %.1f %s' %(\"Heat transferred =\",dq,\"Btu/lbm\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From table 3,\n",
"Heat transferred = 11.4 Btu/lbm\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7 - Pg 150"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the work done and work required\n",
"#Initialization of variables\n",
"T1=100. #F\n",
"P2=1000. #psia\n",
"x=0.6\n",
"J=778.16\n",
"#calculations\n",
"print '%s' %(\"From table 3,\")\n",
"v=0.01613 #ft^3/lbm\n",
"P1=0.9 #psia\n",
"wrev=-v*(P2-P1)*144/J\n",
"dv=0.000051 #ft^3/lbm\n",
"wcomp=(P2+P1)/2 *dv*144/J\n",
"wact=wrev/x\n",
"#results\n",
"print '%s %.1f %s' %(\"Work done =\",wrev,\"Btu/lbm\")\n",
"print '%s %.1f %s' %(\"\\n In case 2, work required =\",wact,\" Btu/lbm\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From table 3,\n",
"Work done = -3.0 Btu/lbm\n",
"\n",
" In case 2, work required = -5.0 Btu/lbm\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 8 - Pg 150"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the Heat transferred\n",
"#Initialization of variables\n",
"pa=1000. #atm\n",
"ta=100. #F\n",
"#calculations\n",
"hf=67.97 #Btu/lbm\n",
"w=3 #Btu/lbm\n",
"ha=hf+w\n",
"print '%s' %(\"from steam table 2,\")\n",
"hc=1191.8 #Btu/lbm\n",
"qrev=hc-ha\n",
"#results\n",
"print '%s %.1f %s' %(\"Heat transferred =\",qrev,\" Btu/lbm\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"from steam table 2,\n",
"Heat transferred = 1120.8 Btu/lbm\n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9 - Pg 151"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the work done and Final state pressure\n",
"#Initialization of variables\n",
"P1=144 #psia\n",
"T1=400 #F\n",
"y=0.7\n",
"#calculations\n",
"print '%s' %(\"From steam tables,\")\n",
"h1=1220.4 #Btu/lbm\n",
"s1=1.6050 #Btu/lbm R\n",
"s2=1.6050 #Btu/lbm R\n",
"P2=3 #psia\n",
"sf=0.2008 #Btu/lbm R\n",
"sfg=1.6855 #Btu/lbm R\n",
"x=(s1-sf)/sfg\n",
"hf=109.37 #Btu/lbm\n",
"hfg=1013.2 #Btu/;bm\n",
"h2=hf+x*hfg\n",
"work=h1-h2\n",
"dw=y*work\n",
"h2d=h1-dw\n",
"#results\n",
"print '%s %d %s' %(\"Work done =\",work,\"Btu/lbm\")\n",
"print '%s %.1f %s' %(\"\\n work done in case 2 =\",dw,\"Btu/lbm\")\n",
"print '%s %d %s' %(\"\\n Final state pressure =\",P2,\"psia\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From steam tables,\n",
"Work done = 266 Btu/lbm\n",
"\n",
" work done in case 2 = 186.8 Btu/lbm\n",
"\n",
" Final state pressure = 3 psia\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10 - Pg 154"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#calculate the Quality of wet steam\n",
"#Initialization of variables\n",
"pb=14.696 #psia\n",
"pa=150 #psia\n",
"tb=300 #F\n",
"#calculations\n",
"print '%s' %(\"From steam tables,\")\n",
"hb=1192.8 #Btu/lbm\n",
"ha=hb\n",
"hf=330.51 #Btu/lbm\n",
"hfg=863.6 #Btu/lbm\n",
"x=(ha-hf)/hfg*100\n",
"#results\n",
"print '%s %.1f %s' %(\"Quality of wet steam =\",x,\"percent\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"From steam tables,\n",
"Quality of wet steam = 99.8 percent\n"
]
}
],
"prompt_number": 10
}
],
"metadata": {}
}
]
}