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Home > Archive > Electrical code Compliance > June 2005 > Please help with a calculation
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Please help with a calculation
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| Jackals 2005-06-17, 11:31 pm |
| I am just a guy with an everyday electrical related query. I hope this is
not off-topic but this is the only pertinent newsgruop I could find. If so,
your patience is appreciated.
I bought a used open-top freezer like they use for pizzas, etc. in
convenience stores. I got it cheap, it works great and freezes everything in
a flash. I would like to consider running it more or less steadily if it
would be cost-worthy, but I don't know how to figure out how much
electricity it would require, what that would cost, and maybe some
comparison in power usage to another common appliance (such as a
refrigerator).
It has a single adjustment knob numbered 1 to 7. It seems to freeze well
even on the lower settings.
The specs on the label are:
115V
50/60 cycle
Refrigerant: 12
Phase: 1
F.L. Amps: 3.9
L.R. Amps 18.6
Any help with this will be greatly appreciated.
Jack
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| HorneTD 2005-06-17, 11:31 pm |
| Jackals wrote:
quote:
> I am just a guy with an everyday electrical related query. I hope this is
> not off-topic but this is the only pertinent newsgruop I could find. If so,
> your patience is appreciated.
>
> I bought a used open-top freezer like they use for pizzas, etc. in
> convenience stores. I got it cheap, it works great and freezes everything in
> a flash. I would like to consider running it more or less steadily if it
> would be cost-worthy, but I don't know how to figure out how much
> electricity it would require, what that would cost, and maybe some
> comparison in power usage to another common appliance (such as a
> refrigerator).
>
> It has a single adjustment knob numbered 1 to 7. It seems to freeze well
> even on the lower settings.
>
> The specs on the label are:
> 115V
> 50/60 cycle
> Refrigerant: 12
> Phase: 1
> F.L. Amps: 3.9
> L.R. Amps 18.6
>
> Any help with this will be greatly appreciated.
>
> Jack
>
>
Jack
The duty cycle of the motor compressor unit is the missing variable.
The duty cycle is the ratio of run time to off time. It will vary with
how full the freezer is and how often the cover is opened. I have a
spare meter I would loan you if you were close by. You would have to
use a recording meter or a watt hour meter to measure the freezers
actual power consumption over time. FL is full load. That is the
current the unit draws when it is running. LR is locked rotor. That is
the current the motor compressor unit will draw if the compressor were
to stall. It draws nearly it's locked rotor current when starting.
--
Tom Horne
"This alternating current stuff is just a fad. It is much too dangerous
for general use." Thomas Alva Edison
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