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| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /3472/CH42/EX42.3/Example42_3.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '3472/CH42/EX42.3/Example42_3.sce')
| -rw-r--r-- | 3472/CH42/EX42.3/Example42_3.sce | 37 |
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diff --git a/3472/CH42/EX42.3/Example42_3.sce b/3472/CH42/EX42.3/Example42_3.sce new file mode 100644 index 000000000..f33a8cecd --- /dev/null +++ b/3472/CH42/EX42.3/Example42_3.sce @@ -0,0 +1,37 @@ +// A Texbook on POWER SYSTEM ENGINEERING
+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
+// DHANPAT RAI & Co.
+// SECOND EDITION
+
+// PART IV : UTILIZATION AND TRACTION
+// CHAPTER 4: ILLUMINATION
+
+// EXAMPLE : 4.3 :
+// Page number 753-754
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+cp = 200.0 // cp of a lamp
+per = 0.6 // Reflector directing light
+D = 10.0 // Diameter(m)
+h = 6.0 // Height at which lamp is hung(m)
+
+// Calculations
+flux = cp*4*%pi // Flux(lumens)
+I_i = cp/h**2 // Illumination at the centre without reflector(lux)
+d = (h**2+(D/2)**2)**0.5 // (m)
+I_without = (cp/h**2)*(h/d) // Illumination at the edge without reflector(lux)
+I_with = cp*4*%pi*per/(25*%pi) // Illumination at the edge with reflector(lux)
+theta = acosd(h/d) // θ(°)
+w = 2.0*%pi*(1-cosd(theta/2)) // ω(steradian)
+phi = cp*w // Φ(lumens)
+I_avg = phi/(25*%pi) // Average illumination over the area without reflector(lux)
+
+// Results
+disp("PART IV - EXAMPLE : 4.3 : SOLUTION :-")
+printf("\nCase(i) : Illumination at the centre without reflector = %.2f lux", I_i)
+printf("\n Illumination at the centre with reflector = %.1f lux", I_with)
+printf("\nCase(ii): Illumination at the edge of the surface without reflector = %.2f lux", I_without)
+printf("\n Illumination at the edge of the surface with reflector = %.1f lux", I_with)
+printf("\nAverage illumination over the area without the reflector, I = %.3f lux\n", I_avg)
+printf("\nNOTE: ERROR: Slight calculation mistake & more approximation in textbook solution")
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