Calculating the estimated Monthly Bill of a Chiller

[windcharm]

Hi All,

I would like to share some thoughts of calcuting the estimated monthly bill of a chiller after consulting some of my friends & cousins.

I hope this will help those who wanted to include a chiller in her setup.

Please correct me if I I did any calculation wrongly. Maybe those bro/sis who are on chiller can share will us if it is accurately estimated?

Formula: KWH x hrs used x amt per KW x number of days.

Assumption:
1) 1 KW = 25.07 cents (w.e.f 1 Jul 200
2) Base on the this model of chiller (hailea, 1/20 HP, 220 - 240V, 0.6A working current) http://www.hailea.com/e-hailea/product-1/HC-100A.htm

1st way of calculation:
Base on my cousin who works in one of the aircon company as I thought a chiller should works about the same as an aircon.

The calculation is base on the follow assumption:
1) 1HP = 2.616KW (Base on how they usually calculate for aircon).

Avg bill per month:
((2.616/20) x 24 x $0.2507 x 365 days)/12 = $23.94 (est.)

2nd way of calculation:
Base on my friend who works as a electric engineer.

The calculation is base on the follow assumption:
1) First calculate the KW by using the the formula: power = Voltage x Current.

Power = 240v x 0.6A = 144W

Avg bill per month:
((144/1000) x 24 x $0.2507 x 365 days)/12 = $26.35 (est.)

You may use this online KW Calculater to help you at
KW Calculator with est. cost: http://www.odograph.com/experiments/php/instantkwh.php

Other information:
Latest utility bill rate: http://services.spservices.sg/

With regards
Windcharm

[tawauboy]

your calculation looks ok.
except that you are assuming the worst case scenario where the chiller is running 24/7. the cost should be lower.

[andrewtyr]

The heat capacity of the setup should be included?

[windcharm]

your calculation looks ok.
except that you are assuming the worst case scenario where the chiller is running 24/7. the cost should be lower.

Yes, it is the worst case scenario. Say if the Chiller only kicks in for 12 times a day and each time it run about 30 mins to cool the tank, the bill would be less than half of the bills calculated, I suppose - taking the energy lost via heat.

[windcharm]

Do we still have to do manual calculations in this hig-powered digital technological age?
Didn't you guys read in the papers (also in the news) 2 wks ago that there's now a digital gadget in the market for tracking how much electricity each appliance consume? It's also under trials FOC in selected HDB homes. All you have to do is to tag it to the appliance you want monitored and you have the reading in KW.
People are saving tonnes of money after purchasing this gadget, which btw, you can get for a song at $200 plus.

Yes, that was out long ago infact. But for 200 plus I can buy other stuffs for my setup, more over, whether we have the electronic device to track the energy consume, chiller still have to on for 24/7. The purpose of this manual calculation is more for those who want to have a estimated monthly bill before they commit to buying one.

[mobile2007]

I would say the second method is the right way to estimate the electrical bills. Basically, power drawn = voltage X current ( rms) . The horsepower refers to the compressor power rating and served as a rough guide for cooling capacity.

[tawauboy]

The heat capacity of the setup should be included?

what do you mean by heat capacity?