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Published byJavier Bream Modified about 1 year ago

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Outer Dimensions Component Length (in)Width (in)Height (in)Inch cube Main Case Component Diam (in)Height (in)Inch cube Side Case (1 of 3) Components Inch cube Total Volume: 11.16

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Weight of Components ComponentsWeight (oz) PCB0.5 Reader0.441 Keypad0.25 Magnetometer0.028 Battery0.770 Side Motor0.229 Side Motor0.229 Side Motor0.229 Case Total1.55 TOTAL:4.23

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Heat Analysis – Hand Calculations Conduction caused by air: Section of chip 0.1” x 0.1” A=6.45*10 -6 m 2 Q= -KA (dT/dx) Q Total =1.6W Q Part =1.6W/210 = W K= (about) Wm -1 K -1 dT/dx = Q/(-KA) dT/dx = /(0.0257*6.45*10 -6 ) = degC/m =649 degF/in =64.9 degF/0.1in Not conclusive, but a good representation that air acts as an insulator Chip Air

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Heat – Experimental Results RFID Reader connected to power in case until it reaches steady state Antenna run on full power for 20 minutes Chip temperature reached about 128 deg F Ambient inside case temp reached about 116 deg F

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Heat – Analytical Analysis Case thermal conductivity = 0.2 Wm -1 K -1 Outside case temp set to 20 deg F Top of chip set to 130 deg F Bottom of chip insulated

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