removing problem statements

1 files changed, 0 insertions, 46 deletions

diff --git a/Engineering_Heat_Transfer/CHAPTER8.ipynb b/Engineering_Heat_Transfer/CHAPTER8.ipynb
index a70f7944..759f39bd 100644
--- a/Engineering_Heat_Transfer/CHAPTER8.ipynb
+++ b/Engineering_Heat_Transfer/CHAPTER8.ipynb
@@ -27,10 +27,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "# Determination of the heat transferred to the wall.\n",

       "\n",

-      "#Given\n",

-      "# air properties at (400+120)/2 =260 degree F = 720 degree R from Appendix Table D1\n",

       "rou= 0.0551             # density in Ibm/cu.ft \n",

       "cp=0.2420               # specific heat BTU/(lbm-degree Rankine) \n",

       "v= 27.88e-5             # viscosity in sq.ft/s \n",

@@ -41,8 +38,6 @@
       "Tw=400.0+460.0              # inside wall temperature in degree R\n",

       "Beta=1/T_inf\n",

       "\n",

-      "#IN THE BOOK THERE IS CALCULATION MISTAKE IN Beta\n",

-      "#Accoding to book Beta=0.00116 /R\n",

       "Beta_=0.00116\n",

       "gc=32.2\n",

       "L=1.0                     # length of wall in ft\n",

@@ -53,7 +48,6 @@
       "A=L*W                   # cross sectional area in sq.ft\n",

       "qw=hL*A*(Tw-T_inf)\n",

       "\n",

-      "#Result\n",

       "print\"The heat transferred is\",round(qw,0),\"BTU/hr\"\n"

      ],

      "language": "python",

@@ -81,10 +75,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "# Determination of heat lost through the glass per unit area\n",

       "\n",

-      "#Given\n",

-      "# properties of air at  0 + 273 K=273 K from appendix table D1\n",

       "rou1=1.295            # density in kg/cu.m\n",

       "cp1=1005.5            # specific heat in J/(kg*K) \n",

       "v1=12.59e-6           #  viscosity in sq.m/s  \n",

@@ -94,7 +85,6 @@
       "T_inf1=0           # inside and outside temperature in K\n",

       "Beta1=1/(T_inf1+273.0)  # volumetric thermal expansion coefficient at 295 K and 273 K\n",

       "\n",

-      "# properties of air at  22 + 273 = 295 K = 300 K(approx) \n",

       "rou2=1.177            # density in kg/cu.m\n",

       "cp2=1005              # specific heat in J/(kg*K) \n",

       "v2=15.68e-6           # viscosity in sq.m/s  \n",

@@ -108,7 +98,6 @@
       "t=0.005               # thickness of glass\n",

       "L=0.60                # window length in m\n",

       "k=0.81                # thermal conductivity of glass from appendix table B3\n",

-      "# for first guess\n",

       "Tw1=18\n",

       "Tw2=4\n",

       "Ra1=(g*Beta1*(Tw2-T_inf1)*L**3)/(v1*a1)\n",

@@ -119,18 +108,15 @@
       "Tw2_=T_inf2-(q1/hL2)\n",

       "Tw1_=q1/hL1+T_inf1\n",

       "\n",

-      "#Using these temprature as second estimates\n",

       "Ra1_=3.7*10**8\n",

       "hL1_=2.92\n",

       "Ra2_=2.31*10**8\n",

       "hL2_=2.80\n",

       "q2=(T_inf2-T_inf1)/((1/hL2_)+(t/k)+(1/hL1_))\n",

       "\n",

-      "#The wall temprature are\n",

       "Tw2final=q2-T_inf2\n",

       "Tw1final=10.7\n",

       "\n",

-      "#result\n",

       "print\"The heat loss is \",round(q2,1),\" W/sq.m\"\n",

       "\n",

       "\n"

@@ -160,9 +146,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "# determination of heat loss through the side.\n",

       "\n",

-      "#Given\n",

       "rou= 0.0735     # density in Ibm/cu.ft \n",

       "cp=0.240        # specific heat BTU/(lbm-degree Rankine) \n",

       "v= 16.88e-5     # viscosity in sq.ft/s \n",

@@ -179,7 +163,6 @@
       "hc=(kf/L)*(0.825+((0.387*(Ra)**(1/6.0))/(1+(0.492/Pr)**(9/16.0))**(8/27.0)))**2\n",

       "q=hc*L*W*(Tw-T_inf)\n",

       "\n",

-      "#Result\n",

       "print\"The heat gained is %d BTU/hr\",round(q,0),\"BTU/hr\"\n"

      ],

      "language": "python",

@@ -207,8 +190,6 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "# Determination of the variation of average convection coefficient with distance\n",

-      "# properties of air at (65 + 20)/2 = 42.5 degree C =315 K. from appendix table D1\n",

       "rou= 1123         # density in kg/m^3 \n",

       "cp= 1006.7        # specific heat in J/(kg*K) \n",

       "v= 17.204e-6      # vismath.cosity in m^2/s  \n",

@@ -222,9 +203,7 @@
       "Tw=65              # roof surface temperature in degree C\n",

       "Beta=1/(T_inf+273.0) # volumetric thermal math.expansion coefficient in per K\n",

       "\n",

-      "#Calculation\n",

       "import math\n",

-      "# determination of Laminar-turbulent  transition length by Vliet equation Ra=3x10^5xmath.exp(0.1368math.cos(90-theta))\n",

       "x=((3e5*math.exp(0.1368*math.cos(90-theta))*v*a)/(g*math.cos(theta)*Beta*(Tw-T_inf)))**(1/3.0)\n",

       "x=0.051\n",

       "print\"The Laminar-turbulent  transition length by Vliet equation is \",round(x,3),\"m\\n\\n\"\n",

@@ -290,10 +269,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "# determine if heat is lost lose more heat through its upper surface or one of its vertical sides\n",

       "\n",

-      "#Given\n",

-      "# properties of air at (100 + 60)/2 = 80\u00b0F = 540 degree R from appendix table D1\n",

       "rou= 0.0735           # density in lbm/cu.ft\n",

       "cp=0.240              # specific heat BTU/(lbm-degree Rankine) \n",

       "v= 16.88e-5           # viscosity in sq.ft/s \n",

@@ -306,18 +282,15 @@
       "L=2.0                  # length in ft\n",

       "W=2.0                  # width in ft\n",

       "\n",

-      "#Calculation\n",

       "Beta=1/(T_inf+460.0)      # volumetric thermal expansion coefficient in per degree Rankine\n",

       "Ra=(g*Beta*(Tw-T_inf)*L**3)/(v*a/3600.0)\n",

       "hc=(kf/L)*(0.68+(0.670*Ra**(0.25))/(1+(0.492/Pr)**(9/16.0))**(4/9.0))\n",

       "q1side=hc*L*W*(Tw-T_inf)\n",

-      "# For the top, we have a heated  surface facing upward, The characteristic length is determined as follows\n",

       "Lc=0.5\n",

       "Ra_L=(g*Beta*(Tw-T_inf)*Lc**3)/(v*a/3600.0) # Rayleigh number based on characteristic length\n",

       "hc_L=(kf/Lc)*0.54*(Ra_L)**(1/4.0)\n",

       "qtop=hc_L*L*W*(Tw-T_inf)\n",

       "\n",

-      "#Result\n",

       "print\"The heat transferred from one side is \",round(q1side,1),\"BTU/hr\"\n",

       "print\"The heat transferred from top is \",round(qtop,0),\"BTU/hr\"\n",

       "\n",

@@ -355,10 +328,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "# determination of heat lost from the insulation by convection\n",

       "\n",

-      "#Given\n",

-      "# properties of air at (50 + 5)/2 = 27.5 degree C = 300 K from appendix table D1\n",

       "rou= 1.177           # density in kg/cu.m\n",

       "cp= 1005.7           # specific heat in J/(kg*K) \n",

       "v= 15.68e-6          # viscosity in sq.m/s  \n",

@@ -371,20 +341,16 @@
       "T_inf=5.0         # ambient air temperature in degree C\n",

       "Tw=50.0            # outside surface temperature in degree C\n",

       "\n",

-      "#Calculation\n",

       "import math\n",

       "Beta=1/(T_inf+273.0) # volumetric thermal expansion coefficient in per K\n",

       "Ra=(g*Beta*(Tw-T_inf)*D**3)/(v*a)\n",

-      "# for horizontal pipe, the convective coefficient is determined as follows\n",

       "hc_h=(kf/D)*(0.60+(0.387*Ra**(1/6.0))/(1+(0.559/Pr)**(9/16.0))**(8/27.0))**2\n",

       "As=math.pi*D*L\n",

       "q_hor=hc_h*As*(Tw-T_inf)\n",

-      "# for vertical pipe, the convective coefficient is determined as follows\n",

       "hc_v=(kf/D)*0.6*(Ra*(D/L))**(1/4.0)\n",

       "q_ver=hc_v*As*(Tw-T_inf)\n",

       "q=round(q_ver,0)+round(q_hor,0)\n",

       "\n",

-      "#Result\n",

       "print\"The heat transferred from the horizontal length of 4 m is \",round(q_hor,0),\"W\"\n",

       "print\"The heat transferred from the vertical length of 4 m is \",round(q_ver,0),\"W\"\n",

       "print\"nThe total heat lost from the pipe is \",round(q,2),\"W\"\n"

@@ -416,10 +382,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#  Determinion of the convection coefficient about the ice cube\n",

       "\n",

-      "#Given\n",

-      "# properties of air at (0 + 70)/2 = 35\u00b0F == 495 degree R from appendix table D1\n",

       "rou= 0.0809          # density in lbm/cu.ft \n",

       "cp=0.240             # specific heat BTU/(lbm-degree Rankine) \n",

       "v= 13.54e-5          # viscosity in sq.ft/s \n",

@@ -430,12 +393,10 @@
       "T_inf=70.0             # ambient temperature  in degree F\n",

       "g=32.2\n",

       "Beta=1/(T_inf+460.0)   # volumetric thermal expansion coefficient in per degree Rankine\n",

-      "#  The characteristic length is found by using King Equation\n",

       "Lc=1/((1/1)+(1/1.2))\n",

       "Ra=(g*Beta*abs(Tw-T_inf)*Lc**3)/(v*a/3600.0)\n",

       "hc=(kf/Lc)*0.6*(Ra)**(1/4.0)\n",

       "\n",

-      "#Result\n",

       "print\"The value of convection coefficient is \",round(hc,2),\"BTU/(hr.sq.ft.degree R)\"\n"

      ],

      "language": "python",

@@ -463,10 +424,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "# determination of the maximum  amount of heat that fins can transfer\n",

       "\n",

-      "#Given\n",

-      "# properties of air at (100 + 35)/2 = 67.5 degree C from appendix table D1\n",

       "rou= 0.998                # density in kg/cu.m\n",

       "cp= 1009.0                # specific heat in J/(kg*K) \n",

       "v= 20.76e-6               # viscosity in sq.m/s  \n",

@@ -477,7 +435,6 @@
       "T_inf=35                   # ambient air temperature in degree C\n",

       "Tw=100                     # surface temperature in degree C\n",

       "Beta=1/(T_inf+273.0)         # volumetric thermal expansion coefficient in per K\n",

-      "# properties of aluminium from appendix table B1\n",

       "rou_Al=2702                 # density in kg/cu.m\n",

       "k_Al=236                   # thermal conductivity in W/(m.K)\n",

       "cp_Al=896                  # specific heat in J/(kg*K) \n",

@@ -485,15 +442,12 @@
       "b=46/100.0\n",

       "w=24/100.0\n",

       "\n",

-      "#Calculation\n",

-      "# Applying the Bar-Cohen Equations\n",

       "zeta=((w*v**2)/(g*Beta*(Tw-T_inf)*Pr))**(1/4.0)\n",

       "L=1.54*(k_Al/kf)**(1/2)*zeta\n",

       "S=2.89*zeta\n",

       "q=(b*w*(Tw-T_inf)*1.3*(k_Al*kf)**(1/2.0))/(6*zeta)\n",

       "N=b/(2*S)\n",

       "\n",

-      "#result\n",

       "print\"The heat transfer rate is \",round(q,0),\"W\"\n",

       "print\"The number of fins can be atmost\",round(N,0)\n",

       "\n"