Results 1 to 8 of 8

Thread: Energy Savings

  1. #1
    Join Date
    Oct 2016
    Location
    United Kingdom
    Posts
    10
    Rep Power
    0

    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
    Join Date
    Sep 2008
    Location
    Canada
    Posts
    751
    Rep Power
    12

    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
    Join Date
    Oct 2016
    Location
    United Kingdom
    Posts
    10
    Rep Power
    0

    Re: Energy Savings

    Many thanks for your excellent reply!

  4. #4
    Join Date
    Oct 2016
    Location
    United Kingdom
    Posts
    10
    Rep Power
    0

    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
    Join Date
    May 2012
    Location
    England
    Age
    53
    Posts
    1,234
    Rep Power
    28

    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
    Join Date
    Jan 2006
    Location
    Croatia
    Age
    62
    Posts
    2,121
    Rep Power
    23

    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

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

  7. #7
    Join Date
    May 2007
    Location
    Auckland
    Age
    67
    Posts
    3,362
    Rep Power
    31

    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
    Join Date
    Oct 2016
    Location
    United Kingdom
    Posts
    10
    Rep Power
    0

    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!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •