If I not mistaken, 25c is the optimun temp. And setting your temp too cold will make your aircon work harder. That not save your bill too.

You never read my post. Your technician is definately 100% wrong.

For conventional air cond, compressor on/off base on +/- 1 degree on top of setting temperature, meaning compressor will turn on when temperature rise 1 degree above setting temperature and off when temperature falls below 1 degree of setting temperature. so setting 25,26 or 23 is no difference. The only diference is for the initial turn on, setting 23 will take longer time to cool your room from 28-30 to 22 degree before it turn off. If your AC is undersize, it will never cool your room to 22, so it will be running forever. The only advantage you enjoy when setting 23 is after you turn off the AC, you still feel cool a little longer compare to setting to 25/26 degree. Heat transfer is largely depend on the medium of transfer but not degree of temperature.

For inverter type, the compressor never stop after turn on, the operating speed of compressor varies according to the setting temperature. If setting temperature to 23, the AC will drive the compressor to 23 degree and stay at the speed to maintain the temperature. Then the energy consumed depend on the actual speed of the compressor to maintain 23 degree, it could be a much higher speed compare to conventional type so end up addition consumption of electricity. As I said b4, conventional compressor running at fix speed of 50Hz from the grid whicle Inverter type running from 15Hz to 90Hz depends on " load". Eventhough at 50Hz, Inverter compressor is more efficient than conventional type due to the Compressor motor (Inverter using DC brushless motor has higher effiecientcy) but running over 70 Hz is definately taking more energy.

Do not believe anything AC technician tells you except about installation and maintenance, they are just the expert of installation, other than that they know close to nothing.

Did you ever ask what is the problem of your AC? Is it mechanical or electrical problem? I can tell you 99% of problems are gas leak (bad welding) and electronics controller (PCBA, motor, remote...etc) problems. You hardly find compressor problem, even there is, it can be caused by installation problem like under charge of gas or air/water trap inside the copper tube.

This post has been edited by KLsooner: Jul 15 2010, 10:56 AM

I LOL'ed at number 2. You actually beleive that crap?

Whether you save or not depends A LOT on your temperature setting and the air cond HP. If you put too low, the compressor is at full power all the time/most of the time, which means there is NO benefit from an inverter.

That is why I recommend only inverter if you put 25c/26c and you use it in a smaller room. Living room and all won't benefit from inverter.

Yeah. The shop owner I go to for electronic recommends inverter for bedrooms but suggest non-inverter for living room.

See whether this black box thing is working efficiently......Due to its inefficiency, I replaced it due a small fire broke up and my electricity bill increased for a few months before I asked TNB to replace it with a new one.

Pic...

You have overheat wire connection there. Maybe due to loose connection or contact no good. You are using quite high amp.

Bro,
That means your dobi shop is consuming a lot of power already... Time to upgrade to 3-phase. You can then upgrade your washing machine to those using 3-phase motor.. more efficient

This post has been edited by wideawake: Jul 15 2010, 01:41 PM

To be more precise, how much you can save is depending on the "temperature difference" between outside and inside.

Setting to 23 degree use more electricity? same temperature setting but turn on the air cond at noon and midnight, there is a huge different. you will see air cond use more power at noon than in midnight, albeit it is set to 23 degree.

My friend is an electrical engineer. What he does is he use a meter to calibrate the temperature. He told me every aircond has a most economic temperature, what he does is he put in the meter then plug the aircond switch into the meter, then he slowly adjust the aircond until the desire power consumption. E.g. 250KWH. His panasonic inverter is at around 25'C. 250KWH * 8 hrs = 2 unit of electric per day = 60 unit per month. His approach is more scientific. When he put the aircond to lower C. It is amazing to find out the power consumption has almost doubled and reaching 400 KWH. I also get a similar meter to measure my LCD TV. When it is at the brightest, it consumes 200KWH, when i lower the brightness to 75%, it only consumes 120KWH. I've tested almost all the equipment in the house. The most consume electric device is fridge. The more time you open the door, the more time the motor kick off and cool the fridge. My fridge is 306L net one and consuming about 200-300KWH when the motor kick off. Boiling water another evil, it is taking 1000KWH to my surprise. Cook rice/put in warm also another evil, 500KWH. Fan is the most stupid one. No matter what speed you set, you consume the same power. So turn your fan to max to gain the maximum benefit.

i am very sorry - this approach makes no sense whatsoever for aircon. if you are talking about an inverter unit, then you must understand that the aircon can run at different consumption levels (in contrast to full power/off for old style). the usage of the inverter aircon is not in any way related to the temperature setting (unless you put an impossible to reach temp, then its always full power). the power will adjust according to what is needed to maintain the set temp level. so the better your place is insulated the less energy will be used to maintain ANY given reachable temperature. there is no "sweet spot" per se.

his proof is bogus too: if you put lower temp, then of course the a/c notices ambient temp is too high and it needs to work more (ie use more power) to reach the new target. put your AC to 29 and you will see it uses even less power.

PJusa,

set at 29?

ppl will tell you might as well no need to on the a/c

which is why i said it will use even less power

heard that Daikin inverter air-con do not require special piping ?

boiler heater min 5kw

if 5000w, the load will burn your house wiring easily which about 20+amp load...
but our standard house wiring & ELCB usually can sustain 15+amp maximum for short tem...

for safety reasons, check equipments' power consumption before use...
recommended not more than 2500watt with standard wiring...

so for those residents planned to use high HP air con, recommended install thicker wiring and ELCB support high amp...

This post has been edited by gkl83: May 19 2011, 08:43 AM

yes.... inverter only save when wastage occurs... when usage is minium/stable, no saving will happen.... like fridge, when I open and close frequently, the comopressor will purge up and down to compensate the temparature variance.... so, wastage occours.. inverter happens just to regulate( big/smaller) instead of open and close...

example.. you have a glass that you want to fill with water.. but your tap can only either open till full or close.. you could not adjust say 10% 40% etc.. but 0% & 100%.... how you going to fill the glass with full water? imagine this... its about the same concept...

I also using inverter type Daikin.
Fridge on 24 hours, toshiba 480L. Use water heater once daily. No cooking, no microwave,
TV on 3 hours perday and PC about 5 hours daily.
Air con 8 hours daily, temp set 26 - 25.
Monthly cost about RM50 or less. Depends if my parents come over here or not.
Light, hall 2 florecent. Room 4 x 15w bulb energy saving type.

For high elec, I think heater might contribute a bit, also depends how long u spend on the bath room with the heater is on. Electrical water boiler, eletrical stove,,,, anything u can notice high watt is consider high electrical usage.

The best is as one our forumer mention using some meter amp to test the power consumption.

Awakened_Angel,

"when usage is minium/stable,no saving will happen" is not really true. an inverter runs at higher efficiency levels (higher EER) on low load situations. i.e. if your inverter runs on low load it will outperform a regular aircon at all times. some dont hit the good EER on full load (most dont actually) and are best at at par with regular units. the key is that you need to use the inverter a/c on below full load situations. then you will permanently save for the entire duration you cool your room. so when usage is minimum is actually when savings happen.

its all about how is the EER at the current load. regular A/C is different its either fully on or totally off so the EER is always stable but EER can be better with inverter A/C

Yes... I mean what I said. I used to be product engineer in hvac r n d

---

Added on May 19, 2011, 9:02 pmEER is just for marketing

This post has been edited by Awakened_Angel: May 19 2011, 09:02 PM