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  1. #1
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    Calculating power use of air conditioning?



    Hello everyone,

    I am trying to approximate the power energy use of air conditioning under certain conditions and assumptions. I would appreciate any help possible.

    The assumptions that I have put are as follows:

    Air conditioning equipment: for now lets say Window 2.5 TR, Split 2.5 TR, Central 15 TR, Chiller 30 TR.
    Refrigerant in use: ***** 22
    Ambient temperature: variable over 24 hours of the day, I have assumptions.
    Length of operation: 24 hours

    Is there some tool that I can use to calculate the power energy use? A formula?

    Truly appreciate your help and hope to hear from you soon.

    Regards,
    Last edited by 3azeez; 05-01-2017 at 07:22 PM.



  2. #2
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    Re: Calculating power use of air conditioning?

    You would need to know the actual running current draw and voltage of each piece of equipment, the running hours per day and the cost of the energy you are paying. (/kWh)

    I assume that in Kuwait you pay for energy in kWh?

    http://www.wikihow.com/Calculate-Kilowatt-Hours
    Last edited by frank; 06-01-2017 at 10:06 AM.
    I'm back on the Pale

  3. #3
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    Re: Calculating power use of air conditioning?

    Hi,

    Thank you for your response.

    Does that mean my best route to get estimation is to use the equipment assumptions I have mentioned earlier to search for appliance label (ie look for a split 2.5 tonne) and then do the calculations mentioned in the link above?

    I was actually thinking of converting the tonnes to BTU/hr and then the BTU/hr to Watt.hr ... does that make any sense?

    1 RT = 12000 BTU/hr
    1BTU/hour = 0.293 watt
    1 Btu x 0.293071 = W.h (watt-hour)

    thanks again and hope to hear from you soon.

  4. #4
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    Re: Calculating power use of air conditioning?

    Quote Originally Posted by frank View Post
    You would need to know the actual running current draw and voltage of each piece of equipment, the running hours per day and the cost of the energy you are paying. (/kWh)

    I assume that in Kuwait you pay for energy in kWh?

    http://www.wikihow.com/Calculate-Kilowatt-Hours

    Hi,
    Sorry to bother you, I hope you have time to check my follow up question about.

    Thank you very much

  5. #5
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    Re: Calculating power use of air conditioning?

    As Frank has mentioned, you would probably have to actually measure the electrical current being drawn by the unit, as the manufacturers label only indicates the cooling capacity of the unit.
    Each different unit could potentially achieve similar cooling results, but be more or less efficient in how it achieves the result.
    Once you have that figure along with the other information suggested, then a calculation can be carried out to estimate your running costs.
    Mobile A/C at its best, see avatar.

  6. #6
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    Re: Calculating power use of air conditioning?

    There are difference between kW of electricity and kW of refrigeration

  7. #7
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    Re: Calculating power use of air conditioning?

    please elaborate.

  8. #8
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    Re: Calculating power use of air conditioning?


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