View Full Version : Calculating power use of air conditioning?

3azeez

05-01-2017, 05:58 PM

Hello everyone,

I am trying to approximate the <strike>power</strike> 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 <strike>power</strike> energy use? A formula?

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

Regards,

frank

06-01-2017, 10:04 AM

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

3azeez

06-01-2017, 05:54 PM

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.

3azeez

08-01-2017, 06:12 PM

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 :)

hyperion

09-01-2017, 11:13 AM

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.

Segei

10-01-2017, 01:16 AM

There are difference between kW of electricity and kW of refrigeration

3azeez

12-01-2017, 04:16 PM

please elaborate.

Segei

13-01-2017, 01:38 AM

You can read this https://en.wikipedia.org/wiki/Seasonal_energy_efficiency_ratio

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