Randen--I have done some btu calculations, will try to sumarise.
6 gal of H2O weighs 50 lbs, and takes 500 btu's (.147 kwh) to raise 10F. So I look at 10F range of my data and take a ratio to .147 kwh.
I selected ranges in the neighborhood of 96 to 106. I try to read the thermometer in the water tank to 0.5F but there might be +/- 0.5F at each reading so these numbers could have up to 10% error. Note I deleted some data lines from the tables I posted just to keep the size down, the following data points do exist on unedited tables.
In the first table (3.5v to fan) going from 96.0F to 106.0F took .155kwh or 106% of theoretical.
In the second table (9v going to fan) going from 97.0 to 107.0F took 0.147kwh or 100% of theoretical.
Go back to my post on 10-18-16 which still has cap tube
Going from 96.0 to 106.0F took .098 kwh or 67% of theoretical.---This is the best test to date.
The next table posted 10-20-16 where I let out some gas to reduce power and subcooling.
Going from 97.0 to 107.0F took .101 kwh or 69% of theoretical.
I need to repeat this using the resistance heater because I think that would be a better comparison since some energy goes to heating the steel tank.
The reason I experimented with different fan speeds to see how it might affect SC, SH, and compresser temp. The air temp out of evap is measured with a thermometer opposite the fan near the bottom of the evaporator so it gets the coldest air out. Performance was better with 9v Vs 3.5v to fan by 6%. I have run it with 18v to fan and it seems to not be much different than 9v, but intend to stick with 18v because I already have too many variables.
I will respond to the other recent comments soon.
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