It’s chilling summer and most of us might be planning to purchase AC and doing internet research. But the main thing which comes to our mind is the power consumption of AC. As this have a significant effect on our pocket. This post outlines, EER (Energy Efficiency Ratio), therefore the method to calculate the facility consumption of 1.5 ton AC in terms of kWh or Unit.

For the sake of calculation of energy / power consumption of AC, we’ll take 3 STAR, 1.5 ton Split AC as reference. But the tactic is well applicable for 1 Ton or other tonnage of Window / Split AC. The very first thing is to note down the details provided on the name plate of AC. Following parameters should be noted from the name plate:

**Cooling Capacity**

**EER **

**Inverter AC / Non-Inverter AC
**

Let’s first discuss each of these parameters in brief.

## Cooling Capacity:

Cooling Capacity of AC is defined because the amount of warmth energy faraway from room. It is given in terms of BTU / hour. BTU stand for British Thermal Unit and it is defined as the amount of heat energy required o raise the temperature of 1 pound of water by 1 degree Fahrenheit. If you calculate this, you will find that

1 BTU = 1055 Joule (Approx)

For 1 Ton AC, the cooling capacity is 12000 BTU/hr. Since 1 BTU = 1055 Joule, therefore , cooling capacity of 1 Ton AC in terms of Watt are going to be

(12000 x 1055) / 3600 = 3516 Joules / sec.

= 3516 Watt

Similarly, if we consider 1.5 Ton AC, the cooling capacity is 18000 BTU/hr, which suggests 5275 Watt approx. Thus cooling capacity is fixed by the tonnage of AC.

### Energy Efficiency Ratio (EER):

Energy Efficiency Ratio or EER may be a parameter which determines the use of input power supply to chill the space . Obviously, every consumer should search for better utilization of input power supply because it will help to scale back the electricity consumption and hence bill.

EER of AC may be a ratio of Cooling Capacity to the input power supply consumed. Different STAR rating of AC has different value of Energy Efficiency ratio.

EER = Cooling Capacity / Input Power

The unit of EER is thus Watt / Watt.

From the above table it is clear that if EER lies in between 3.10 to 3.29, the AC will be given 4 STARs. But what does this information mean to a consumer?

The better the EER value, the lower will be the power consumption AC and hence lower will be impact on you pocket. So if you see two 4 STARs ACs, one having EER value of 3.15 and another having 3.25, then you should go for second AC as its EER value is better.

### Power Consumption of AC:

If you see the name plate of AC, you’ll notice that value of Ac Manufacture Compney is mentioned. Electricity consumption per annum is additionally mentioned. But it must be noted that, the electricity consumption mentioned on the name plate has been calculated supported certain parameters. The accepted norm of an EER is, the 27 degree temperature inside the space , the 35 degree temperature outside the space , whereas the humidity is 50%. within the figure, LLOYD Split AC having EER Rating of three .72 has annual power consumption of 1049.79 Units or kWh.

### 1.5 ton ac power consumption

The actual power consumption by AC depends on various factors: Room Size, Heat Load within the room, ambient temperature etc. Thus the particular yearly power consumption may vary from what mentioned. But the facility consumption mentioned at the name plate may function a reference for comparison of varied ACs.

### Which AC you ought to buy?

Obviously, one which consumes less power. As inverter AC is variable tonnage AC. It changes its tonnage as per the ambient and temperature . Therefore, its energy efficiency is sort of good and hence consumes less power. While non-inverter AC always runs at full tonnage and hence consumes more power for an equivalent room cooling. Therefore, Inverter AC is usually recommend. Lets us now decide whether should we buy 3 STAR or 5 STAR AC?

Obviously 5 STAR AC will have more energy efficiency and hence less electricity bill. But the value of 5 STAR AC is sort of higher in comparison with 3 STAR AC.

So if Your Room size Is Bigger You Can Buy 1.5 Dc Inverter Ac And If Your Room Size Is lower you can install 1 ton dc inverter ac.

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