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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:0f69a839d3ec8a6e20f49cef0966e931497f52ea6c7ffcec43b822cf678199cf"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Various types of tarrifs"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Exa 11.1 page 290"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Given Data :\n",
+      "E=438000.0 #in kWh(Energy consumed per year)\n",
+      "pf=0.8 #unitless\n",
+      "cosfi=pf #unitless\n",
+      "LoadFactor=40.0 #in %\n",
+      "#tarrif=Rs. 75/year/kw of max demand plus 3 paise per unit per reactive KVA\n",
+      "h=8760.0 #no. of years in a year\n",
+      "AvgLoad=E/h #kw\n",
+      "MaxLoad=AvgLoad/(LoadFactor/100) #in kw\n",
+      "MaxLoad_KVA=MaxLoad/pf #in KVA\n",
+      "tanfi=math.tan(math.acos(cosfi)) #unitless\n",
+      "ReactiveKVAR=h*tanfi*AvgLoad #in KVA\n",
+      "AnnualBill=75*MaxLoad+(3/100)*E+(1.5/100)*ReactiveKVAR #in Rs.\n",
+      "CostPerUnit=AnnualBill/E #in Rs.\n",
+      "CostPerUnit=CostPerUnit*100 #in Paisa\n",
+      "print \"Cost per unit is %0.2f Paisa\" %CostPerUnit"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Cost per unit is 3.27 Paisa\n"
+       ]
+      }
+     ],
+     "prompt_number": 12
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Exa 11.2 page 291"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given Data :\n",
+      "#tarrif=Rs. 275/year/KVA of max demand plus 35 paise per unit\n",
+      "C1=275.0 #in Rs.year/KVA\n",
+      "C2=35.0 #in paisa/unit\n",
+      "LoadFactor=30.0 #in %/year\n",
+      "LoadFactor=30.0/100 #in fraction\n",
+      "#Let MaxDemand = x KW\n",
+      "#Case (i) PF=1\n",
+      "cosfi=1 #unitless\n",
+      "AnnualBillBYx=C1/cosfi+(C2/100)*LoadFactor*24*365 #in Rs.(Here 24*365 is for No. of hours in a year)\n",
+      "AnnualBill=AnnualBillBYx*100/(LoadFactor*24*365) #in paisa/unit\n",
+      "print \"Cost per unit(at unity power factor) is %0.2f paisa/unit\" %AnnualBill \n",
+      "#Case (i) PF=0.8\n",
+      "cosfi=0.8 #unitless\n",
+      "AnnualBillBYx=C1/cosfi+(C2/100)*LoadFactor*24*365 #in Rs.(Here 24*365 is for No. of hours in a year)\n",
+      "AnnualBill=AnnualBillBYx*100/(LoadFactor*24*365) #in paisa/unit\n",
+      "print \"Cost per unit(at 0.8 power factor) is %0.2f paisa/unit\" %AnnualBill"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Cost per unit(at unity power factor) is 45.46 paisa/unit\n",
+        "Cost per unit(at 0.8 power factor) is 48.08 paisa/unit\n"
+       ]
+      }
+     ],
+     "prompt_number": 15
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Exa 11.3 page 292"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#Given Data :\n",
+      "FixedLoad=200.0 #in kW\n",
+      "PF=0.8 #unitless\n",
+      "cosfi=PF #unitless\n",
+      "h=10.0 #in hours/day\n",
+      "d=300.0 #in days\n",
+      "Time=h*d #in hours\n",
+      "Energy=FixedLoad*Time #in kwh/year\n",
+      "# (i) tarrif=Rs. 100/KVA/Annum plus 20 paise per kwh\n",
+      "C1=100.0 #in Rs.year/KVA\n",
+      "C2=20.0 #in paisa/kwh\n",
+      "KVA=FixedLoad/cosfi #in KVA\n",
+      "AnnualBill=KVA*C1+(C2/100)*Energy #in Rs.\n",
+      "print \" Case (i) Annual Payment is %0.2f Rs.\" %AnnualBill \n",
+      "# (ii) tarrif=Rs. 100/KW/Annum plus 20 paise per kwh plus 2 paise/KVARH\n",
+      "C1=100.0 #in Rs./year/KW\n",
+      "C2=20.0 #in paisa/kwh\n",
+      "C3=2.0 #in paisa/KVARH\n",
+      "tanfi=math.tan(math.acos(cosfi)) #unitless\n",
+      "ReactiveKVARH=FixedLoad*tanfi*Time #in KVARH\n",
+      "AnnualBill=C1*FixedLoad+(C2/100)*Energy+(C3/100)*ReactiveKVARH #in Rs.\n",
+      "print \" Case (ii) Annual Payment is %0.2f Rs.\" %AnnualBill "
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Case (i) Annual Payment is 145000.00 Rs.\n",
+        " Case (ii) Annual Payment is 149000.00 Rs.\n"
+       ]
+      }
+     ],
+     "prompt_number": 18
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Exa 11.4 page 292"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given Data :\n",
+      "Energy=180000.0 #in kwh\n",
+      "LoadFactor=45.0 #in %/year\n",
+      "LoadFactor=45.0/100 #in fraction\n",
+      "#Charges=Rs. 50/KW/Annum plus 8 paise per unit\n",
+      "C1=50 #in Rs.year/KW\n",
+      "C2=8 #in paisa/unit\n",
+      "h=365*24 #no. of hours per year\n",
+      "AvgLoad=Energy/h #in KW\n",
+      "MaxLoad=AvgLoad/LoadFactor #in KW\n",
+      "FixCharges=MaxLoad*C1 #in Rs.\n",
+      "PlusCharges=(C2/100)*Energy #in rs.\n",
+      "TotalTarrif=FixCharges+PlusCharges #in Rs.\n",
+      "print \"Total Annual electricity charges is %0.2f Rs.\" %TotalTarrif"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Total Annual electricity charges is 2283.11 Rs.\n"
+       ]
+      }
+     ],
+     "prompt_number": 20
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Exa 11.5 page 293"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given Data :\n",
+      "Energy=25.0*10**6 #in kwh\n",
+      "MaxDemand=1600.0 #in KW\n",
+      "#(i) Rs. 70/KW max demand plus 2 paise per kwh\n",
+      "C1=70.0 #in Rs.year/KW\n",
+      "C2=2 #in paisa/unit\n",
+      "AnnualCost=MaxDemand*C1+(C2/100)*Energy #in Rs.\n",
+      "print \"Case (i) Annual cost of energy is %0.2f Rs.\" %AnnualCost \n",
+      "#(ii) Annual cost at a flat rate of 5p/kwh\n",
+      "C=5.0 #in paisa/kwh\n",
+      "AnnualCost=(C/100)*Energy #in Rs.\n",
+      "print \"Case (ii) Annual cost of energy is %0.2f Rs.\" %AnnualCost \n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Case (i) Annual cost of energy is 112000.00 Rs.\n",
+        "Case (ii) Annual cost of energy is 1250000.00 Rs.\n"
+       ]
+      }
+     ],
+     "prompt_number": 22
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Exa 11.6 page 293"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given Data :\n",
+      "MaxDemand=20 #in KW\n",
+      "#(i) Rs. 180/KW/annum max demand plus 15 paise per unit\n",
+      "#(ii) Flat rate tarrif 40 paise/unit\n",
+      "C1=180.0 #in Rs.year/KW\n",
+      "C2=15.0 #in paisa/unit\n",
+      "#AnnualBill1=C1*MaxDemand+(C2/100)*x  x is the energy consumed\n",
+      "C=40.0 #in paisa/unit\n",
+      "#AnnualBill2=(C/100)*x  x is the energy consumed\n",
+      "#Puting two bills equal gives :\n",
+      "x=C1*MaxDemand/((C/100)-(C2/100)) #in kwh\n",
+      "print \"No. of units to be consumed is %0.2f or in %0.2f kwh \" %(x,x)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "No. of units to be consumed is 14400.00 or in 14400.00 kwh \n"
+       ]
+      }
+     ],
+     "prompt_number": 26
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Exa 11.7 page 294"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given Data :\n",
+      "MaxDemand=500.0 #in KW\n",
+      "LoadFactor=70.0 #in %/year\n",
+      "LoadFactor=70.0/100 #in fraction\n",
+      "cosfi=0.8 #unitless\n",
+      "#(i) Rs. 80/KVA of max demand\n",
+      "#(ii) Running chargeare  5 paise/kwh\n",
+      "C1=80.0 #in Rs./KVA\n",
+      "C2=5.0 #in paisa/kwh\n",
+      "AvgLoad=MaxDemand*LoadFactor #in KW\n",
+      "h=365.0*24 #no. of hours per year\n",
+      "Energy=AvgLoad*h #in kwh\n",
+      "MaxDemandKVA=MaxDemand/cosfi #in KVA\n",
+      "AnnualBill=MaxDemandKVA*C1+(C2/100)*Energy #in RS\n",
+      "print \"Annual bill of consumer is %0.2f Rs.\" %AnnualBill "
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Annual bill of consumer is 203300.00 Rs.\n"
+       ]
+      }
+     ],
+     "prompt_number": 27
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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