guys for a room about 14ft x 17 usually need how much HP aircond to run effectively?planning to use Panasonic 1HP inverter AC

This post has been edited by Reyz: Apr 2 2012, 08:18 PM

Not enough. Minimal 1.5, best will be 2hp.

1HP is good enough, my master room even bigger than 14x17, I just use 1HP hitachi inverter.

Unless the room windows are facing west, and it needs to be turned on during daytime, then may consider to use 1.5HP

For a big master room, 22ft x 15ft with a bathroom attached 6ft x 6ft.
Do you think 1.5HP Inverter or 2.0HP Inverter saves more energy ?
Bear in mind that 2.0HP Inverter consumers more power than 1.5HP.
But 2.0 HP takes less time to cold down the room than 1.5HP.

If both Inverter, 1.5HP or 2.0HP saves more energy? Please explain here. Thanks.

Also depend what is your temperature setting. To me is better oversize than undersize. Size like mine using 1HP is over work. Just like a heavy car with 2L engine drink more fuel than a 3L same car, and the power is there when you need it.

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Added on April 2, 2012, 10:52 pm2 and 1.5hp piping is the same. And some installer told me even better to use 2.5 piping because if not enough power can still upgrade without doing piping. In a hot day, 2hp will cool the room faster, and than switch to lower the compressor. 1.5hp may take slightly longer to cool the room to desire temperature.

This post has been edited by weikee: Apr 2 2012, 10:52 PM

Use this calculator to choose your aircond

http://www.goodhousekeeping.com/home/air-c...oner-calculator

They have standard sizing for copper piping, else heat transfer wont be efficient and also you might suffer liquid refrigerant returned to your compressor and very soon, your compressor will be dead !

Heat transfer is not on the copper piping. Is on the Compressor, when you install larger piping, the a/c installer just need to top the gas to ensure pressure is there.

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Added on April 3, 2012, 9:30 amYour link do not take account of outside temperature. To actually calculate correct size you need to know the average temperature of the weather during the operation time.

Try use this

http://www.calculator.net/btu-calculator.html

http://papamy.panasonic.com.my/papamy/horse.html


And from York Malaysia <http://www.york.com.my/main.asp?tpage=faq>


It is not easy to estimate the actual heat load of a room without going through some tedious calculation. You are advised to consult air conditioner contractors before you decide on the equipment. Bring along the plan and measurement of your room and be specific what is the function of the room, is it a bedroom or a living room?

There is however, a rule of thumb that could give you a rough estimation of the required cooling capacity. This can be achieved by doing a simple calculation.

First, multiply the volume of your room in cubic feet with a factor of 6. Determine the number of person using the room and multiply with 500Btu/hr, as each person produces 500Btu/hr of heat for normal activity. Add these two together, and you get the estimated cooling capacity.

The calculation just now is for bedroom only. For other applications, the factor has to be changed. This rule of thumb calculation is just for estimation purposes. It is advised to reconfirm with your air conditioner contractors again before you place your order.

This post has been edited by weikee: Apr 3 2012, 09:30 AM

Copper piping ofcourse is not for heat transfer, heat transfer being done at condenser and evaporator coil. When you have too much refrigerant in a designed coil that take not that much, you will have too little or non superheat, that will tend to liquid form refrigerant to be returned to your compressor which is definately a no no to HVAC design. Im in HVAC design industry for years, and deal with big chillers, ahu... i know what im talking about... Just my two cents, follows the recommended installation guide.

I know what you mean. The difference between 1.5hp and 2.5hp piping is not significant to have this problem. Anyway, this also recommend by my friend who run a chiller service and installer company.

just to add: not just outside temp is important. you should also consider how well insulated your room is, how many people usually occupy it and what desired temp you want to chill down the room to.

in a well insulated room, a 1 HP aircon can easily handle a 25 sqm room. however if there is lot of traffic through the room (i.e. moving a lot of chilled air out) or a lot of people inside the room then you might need more power. same goes for equipment in the room that generates heat (PCs, lights, fridge, whatnot).

unless you know precisely how the room will be utilised it will be hard to give a good recommendation for the size of AC required.

FYI: 7,5 HP of a/C capacity *can* easily cool 550-650 cubicmetres of air to actual 25°C in a 3-5 person household if the rooms are insulated and windows ducted in normal malaysian climate (also in hot season!).

great info sharing peeps...m looking to install 6 airconds in my new house...need to properly calculate...

We are here to exchange ideas, and get feedback

Knowledge is to share. Not to keep.

after calculate the total BTU, my master room requires slightly more than 1.5HP but less than 2.0 HP. Shall i go for 1.75HP as i know Panasonic has 1.75HP Inverter

More is better. And if control by inverter, your bill will be lower some more.

1 HP for 25sqm room enough? Panasonic is testing their 1.5 HP Inverter A/C in a even smaller room which is 16.2 sqm and test result shows that 50% more energy saving compare to 1.5 none Inveter A/C.

http://papamy.panasonic.com.my/papamy/features.html

This post has been edited by slackinux: Apr 3 2012, 02:26 PM

Huhu.. it's happen to me.. a lot of noise and sometimes not cold even the temp 16C.. koyak ler...

How about 1.75HP Inverter? Only Panasonic has 1.75HP Inverter. This 1.75HP Inverter has the highest EER i.e. 12.7 among all the Panasonic Inverter model A/C.

would like to ask about conceal cooper & drain piping....

- 2HP & 30 feet.
shop A = RM550
shop B = RM530

- 1.5HP & 10 feet.
shop A = RM300
Shop B = RM220

is the price reasonable?

I think better get common spec, like 2hp. Can ask them use 2.5HP piping, because 2.5HP piping can be use for 2hp too. After I install 2hp piping in my living room, my friend told me can use 2.5hp piping, in future if 2hp not enough cooling can change to 2.5hp

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Added on April 3, 2012, 3:16 pmIt say up to 50%, notice the key word "up to", and is usually under control environment. No doubt for long operation hours of a/c inverter do save some. Exact really don't know.

This post has been edited by weikee: Apr 3 2012, 03:22 PM