Nichrome Dew Heater Calculator
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Step 1: Find the Ideal Nichrome WireStep 2: Design your Dew Heater Band
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OTA Circumference:29.00cmMeasured Nichrome Resistance per metre (Rm):13.00Ohms per metre
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Overlap Required:3.00cmSeries Circuit Results
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Target Power Output (Oc):0.30Watts per cmTotal Length of Nichrome (Ws):115.38cm
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Power Supply Voltage (Vs):12.00VoltsNumber of Turns Round OTA (Ts):3.61Turns*
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Length of Band (Cb):32.00cm* Use the parallel result if less than 1 turn, otherwise increase "Overlap Required" to get a whole number of turns.
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Total Power Output (Ot):9.60Watts
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Current Drawn (Is):0.80AmpsParallel Circuit Results
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Total Resistance (Rt):15.00OhmsResistance of One Nichrome Run (Rp):4.16Ohms
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Series Circuit Results - Ideal nichrome resistance.Total length of Nichrome (Wp):8.87cm
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Nichrome Resistance (1 Turn Round OTA) (Rm):46.88Ohms per metreNumber of Parallel Runs Required (Np):0.28Runs**
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Nichrome Resistance (2 Turns Round OTA) (Rm):23.44Ohms per metre** Use series result if less than 1.5 runs, otherwise increase "Overlap Required" to get a whole number of runs.
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Nichrome Resistance (3 Turns Round OTA) (Rm):15.63Ohms per metre
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User Entered Turns Round OTA (Ts):4TurnsStep 3: Check your Band Before Use
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Nichrome Resistance (4 Turns Round OTA) (Rm):11.72Ohms per metreMeasured Resistance of Band (Rt):13.69Ohms
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Parallel Circuit Results - Ideal nichrome resisistance.Measured Length of Band (Cb):35.00cm
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Nichrome Resistance (2 Parallel Runs) (Rm):93.75Ohms per metreMeasured Power Supply Voltage (Vs):12.00Volts
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Nichrome Resistance (3 Parallel Runs) (Rm):140.63Ohms per metreRated Power Supply Current:3.00Amps
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User Entered Parallel Runs (Np):4RunsPower Output (Oc):0.30Watts per cm
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Nichrome Resistance (4 Parallel Runs) (Rm):187.50Ohms per metreCurrent Drawn (Is):0.88Amps ***
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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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