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Thread: Energy Savings

  1. #1
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    Energy Savings



    Is there a way of calculating how much energy you could save by optimising your refrigeration unit? For example, if a freezer was set to -20 and it only needs to be at -18, how much energy could be saved by changing the setting to -18?

    Many thanks!



  2. #2
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    Re: Energy Savings

    Heat transfer to the room will be reduced and energy will be saved. Heat transfer is proportional to temperature difference between inside and outside. Assume that outside temperature is 20C. Initial temperature difference is 20 - (-20)= 40C If inside temperature changes to -18C, temperature difference will be 38C. Energy savings will be (40-38)/40=0.05 or 5%
    Last edited by Segei; 11-11-2016 at 11:38 PM.

  3. #3
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    Re: Energy Savings

    Many thanks for your excellent reply!

  4. #4
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    Re: Energy Savings

    One last question, do you know much electricity a fridge, freezer or cold room would use say in a month, just estimates?

    Thanks in advance!

  5. #5
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    Re: Energy Savings

    .

    1Kwh is about 12p so if you had an electric motor that
    was one Kilowatt in size it would cost about 12p an hour to run.

    If your compressor was about 500w then it would cost 6p an hour.

    Most fridges and freezers when the door is closed should be off for
    longer than they run, so if you had a small chest freezer with a 300w
    compressor on it would cost 4 or 5 pence an hour over say 10 to 12 hours
    a day.

    4p for 10 hours is only about 40p a day, 5p for 12 hours is about 60p a day

    £4 to £6 every 10 days, £12 to £18 a month????????

    All rough and off the top off my head so there will be a margin of error
    if my maths are wrong............

    Rob

    .
    Last edited by Rob White; 11-11-2016 at 04:07 PM.
    .. ... -. .----. - / -- --- .-. ... . / -.-. --- -.. . / --. --- --- -..

  6. #6
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    Re: Energy Savings

    Quote Originally Posted by Rob White View Post
    .

    1Kwh is about 12p so if you had an electric motor that
    was one Kilowatt in size it would cost about 12p an hour to run.

    If your compressor was about 500w then it would cost 6p an hour.

    Most fridges and freezers when the door is closed should be off for
    longer than they run, so if you had a small chest freezer with a 300w
    compressor on it would cost 4 or 5 pence an hour over say 10 to 12 hours
    a day.

    4p for 10 hours is only about 40p a day, 5p for 12 hours is about 60p a day

    £4 to £6 every 10 days, £12 to £18 a month????????

    All rough and off the top off my head so there will be a margin of error
    if my maths are wrong............

    Rob

    .
    Error or not within your math for sure will be a margin of error ...

    but moral of the story is ...
    to make savings we need to keep our fridge or freezer closed most of the time


    Best regards, Josip

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  7. #7
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    Re: Energy Savings

    Cycling off evaporator fans with temperature controller, saves money twice, fans add heat to room then uses power to remove that heat, start fans intermittently in off cycle for short periods.

  8. #8
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    Re: Energy Savings

    Quote Originally Posted by Rob White View Post
    .

    1Kwh is about 12p so if you had an electric motor that
    was one Kilowatt in size it would cost about 12p an hour to run.

    If your compressor was about 500w then it would cost 6p an hour.

    Most fridges and freezers when the door is closed should be off for
    longer than they run, so if you had a small chest freezer with a 300w
    compressor on it would cost 4 or 5 pence an hour over say 10 to 12 hours
    a day.

    4p for 10 hours is only about 40p a day, 5p for 12 hours is about 60p a day

    £4 to £6 every 10 days, £12 to £18 a month????????

    All rough and off the top off my head so there will be a margin of error
    if my maths are wrong............

    Rob

    .
    Thanks very much,exactly what I was looking for!

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