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Electronics & Appliances Aircon split type

Discussion in 'Businesses - Services - Products' started by jimeve, May 31, 2019.

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  1. furriner

    furriner DI Forum Adept Restricted Account

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    Hello jimeve, I don’t normally pull rank but I am an a BSEE electrical engineer from the University of Wisconsin. I only say so because you are saying things that are fundamentally incorrect and in asking others to explain to me how correct you are, you are risking the wholesale lowering of the IQ in this thread concerning Rhône power consumption. Now: If you have a “1000 watt drill”, first of all I would wonder where the 1000 watts of resistive power is being dissipated. I didn’t want to get into this but some of what we are talking about is reactive loads and a drill connected to mains power as a motor load would more appropriately be designated by KVA containing both reactive (non-consuming) and resistive (consuming) power. So then, let us look at your 1000 VA (1KVA) drill. That’s no small drill, Jim. Were you employed by a machine shop? If you run the drill for 1 hour, sure, you will consume energy designated by Kwh units, perhaps 0.8KWh out of 1KVA for 1 hour, assuming you really mean a 1000 VA drill). However, converting your Kw (power) to Kwh (energy) by multiplying the hours used under full load does nothing to explain your powering a 27Kw (power) inverter AIRCON (probably close to 90% efficiency) or around 30KVA, by a 15KVA power transformer. I’m afraid you would blow the breaker after perhaps watching some sparks fly in the process. KVA is similar to Kw except that it contains the reactive component of total power which adds to the total number, even for highly efficient inverter circuits, but it has no relationship in itself to Kwh (energy) and your power transformer. Your “15 KVA” transformer simply describes the amount of power that can be be fed into your residence in any one period of time. The ratings of all lights and appliances of your residence must be less than 15KVA at ant one period of time. Your total energy consumption for one month should be less than 24*30*15Kwh or about 10800 Kwh (which at 10php/Kwh would be a pretty big bill, about 2000 USD). Of course no one loads their residence at max available power, 10KVA, 15 or 25 KVA every minute of every day, 24/7, fortunately!) And I didn’t get into suggested deratings by the power company, perhaps 80% or so. So don’t try to snow everyone with your fundamentally incorrect statements. I gave you a chance to correct yourself and you doubled down on insisting to be incorrect. Be careful on these forums because sometimes there are people who have been educated in the subject you extol so confidently about.


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    furriner
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    furriner, Jun 2, 2019
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  2. SkipJack

    SkipJack DI Senior Member

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    Dear @furriner, Please "Be careful on these forums because sometimes there are people who have been educated in the subject you extol so confidently about." and "... you are risking the wholesale lowering of the IQ in this thread ...".

    Although he left off the H, it is obvious that the OP meant 27 kWH per day instead of kW of instantaneous load.

    In the OP's original post he stated: "Just had it completely cleaned. last reading 27 kw 24 hours, ..." The "24 hours" should have given you a hint that he meant the electricity consumed over the entire 24 hour day.

    In a later post, the OP attempted to clarify this by including the calculation of cost per day: "the one in question is using 27 KW a day * 10 = 270 pesos." The fact that the OP is multiplying the "27 KW a day" by the utility rate of 10 pesos per kilowatt hour (kWH) should make it obvious to you that he actually meant 27 kilowatt hours (kWH) per day instead of 27 kW of instantaneous load.

    As an electrical engineer you should realize that this is the power consumed over a 24 hour period. Assuming that the air conditioner is running all day, we would take the 27 kWH divided by 24 hours per day to get 1.125 kW per hour or 1,125 watts per hour consumed. It has been hot lately so assuming the air conditioner is running at full load and not cycling down, 1,125 watts at 750 watts per HP would equate to a 1-1/2 HP unit. Which is much less than the 27,000 watts you assumed as the instantaneous load.

    Furthermore, they may be looking at the meter and not considering the other appliances in the apt.

    @jimeve, Does the 27 kWH include other appliances like a refrigerator? Is the tenant running it all day? Please also give us the rated power of the air conditioner unit.

    It has been more humid lately. I noticed that the freezer in my refrigerator frosted up which reduced its efficiency. It was running all day and not cycling off. After defrosting it the electrical consumption dropped way off.

    Thanks
     
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    SkipJack, Jun 3, 2019
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  3. RR_biker

    RR_biker DI Senior Member Veteran Marines

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    According to the above mathematic does it implicate that a 0,75 HP window unit will consume around 0,56 Kwh an hour??
     
    RR_biker, Jun 3, 2019
    #23
  4. Jack Peterson

    Jack Peterson DI Forum Luminary Highly Rated Poster SC Connoisseur Veteran Air Force

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    what can I sayWho knows (dave (1).jpg Figures quoted were for a split type Inverter :thumbsup:
     
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    Jack Peterson, Jun 3, 2019
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  5. OP
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    jimeve

    jimeve DI Forum Luminary Highly Rated Poster Showcase Reviewer Veteran Army

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    Hello SkipJack, that includes all the appliances. 1 hp split inverter aircon and yes I meant to say 27 KWH.
     
    jimeve, Jun 3, 2019
    #25
  6. OP
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    jimeve

    jimeve DI Forum Luminary Highly Rated Poster Showcase Reviewer Veteran Army

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    That was an example if you care to read what I posted about the drill. Please refrain from condescending remarks, It's not the first time. I have been a member on this form since it was formed 2006, I joined two months later in February 2007. You being a new member have to learn some manners. Keep out of my way.
     
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    jimeve, Jun 3, 2019
    #26
  7. furriner

    furriner DI Forum Adept Restricted Account

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    If he didn’t write what he really intended, ie, he meant 27Kwh, then he should correct it as it was not obvious to me. If I drive 60mph for 1hr, you will know I travelled 600 miles but would never believe my car went 600 miles per hour. That is an exact analog.


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    furriner, Jun 3, 2019
    #27
  8. furriner

    furriner DI Forum Adept Restricted Account

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    Keep out of your way. Intelligent discussion at its best lol.


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    furriner, Jun 3, 2019
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  9. hawk263

    hawk263 DI Forum Adept Blood Donor Veteran Army

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    60 mph for 1hr = 60 miles.
     
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    hawk263, Jun 3, 2019
    #29
  10. furriner

    furriner DI Forum Adept Restricted Account

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    I caught that after my post...haha


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    furriner, Jun 3, 2019
    #30
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