A | B | C | D | E | F | G | H | I | J | K | |
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1 | Step 1: Find the Ideal Nichrome Wire | Step 2: Design your Dew Heater Band | |||||||||

2 | OTA Circumference: | 29.00 | cm | Measured Nichrome Resistance per metre (Rm): | 13.00 | Ohms per metre | |||||

3 | Overlap Required: | 3.00 | cm | Series Circuit Results | |||||||

4 | Target Power Output (Oc): | 0.30 | Watts per cm | Total Length of Nichrome (Ws): | 115.38 | cm | |||||

5 | Power Supply Voltage (Vs): | 12.00 | Volts | Number of Turns Round OTA (Ts): | 3.61 | Turns* | |||||

6 | Length of Band (Cb): | 32.00 | cm | * Use the parallel result if less than 1 turn, otherwise increase "Overlap Required" to get a whole number of turns. | |||||||

7 | Total Power Output (Ot): | 9.60 | Watts | ||||||||

8 | Current Drawn (Is): | 0.80 | Amps | Parallel Circuit Results | |||||||

9 | Total Resistance (Rt): | 15.00 | Ohms | Resistance of One Nichrome Run (Rp): | 4.16 | Ohms | |||||

10 | Series Circuit Results - Ideal nichrome resistance. | Total length of Nichrome (Wp): | 8.87 | cm | |||||||

11 | Nichrome Resistance (1 Turn Round OTA) (Rm): | 46.88 | Ohms per metre | Number of Parallel Runs Required (Np): | 0.28 | Runs** | |||||

12 | Nichrome Resistance (2 Turns Round OTA) (Rm): | 23.44 | Ohms per metre | ** Use series result if less than 1.5 runs, otherwise increase "Overlap Required" to get a whole number of runs. | |||||||

13 | Nichrome Resistance (3 Turns Round OTA) (Rm): | 15.63 | Ohms per metre | ||||||||

14 | User Entered Turns Round OTA (Ts): | 4 | Turns | Step 3: Check your Band Before Use | |||||||

15 | Nichrome Resistance (4 Turns Round OTA) (Rm): | 11.72 | Ohms per metre | Measured Resistance of Band (Rt): | 13.69 | Ohms | |||||

16 | Parallel Circuit Results - Ideal nichrome resisistance. | Measured Length of Band (Cb): | 35.00 | cm | |||||||

17 | Nichrome Resistance (2 Parallel Runs) (Rm): | 93.75 | Ohms per metre | Measured Power Supply Voltage (Vs): | 12.00 | Volts | |||||

18 | Nichrome Resistance (3 Parallel Runs) (Rm): | 140.63 | Ohms per metre | Rated Power Supply Current: | 3.00 | Amps | |||||

19 | User Entered Parallel Runs (Np): | 4 | Runs | Power Output (Oc): | 0.30 | Watts per cm | |||||

20 | Nichrome Resistance (4 Parallel Runs) (Rm): | 187.50 | Ohms per metre | Current Drawn (Is): | 0.88 | Amps *** | |||||

21 | To edit, use File -> Download As to save a copy in Excel format. Then create a new Google Sheet in your own account and use File -> Import on the saved copy. Full instructions for use at: http://www.blackwaterskies.co.uk/2013/05/making-your-own-nichrome-dew-heater.html | *** Check that the current drawn is less than the power supply's rating. If you are using several heater bands from one supply, just add all the current draws together. Make sure you have a fuse rated slightly higher than the total draw between the power supply and the heater bands, especially if you are using a battery for power. | |||||||||

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