Inverter Air

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My airconditioner and power consumption?

My airconditioner is rated at 1hp. My question here is that if i turn the settings of my air conditioner to second to the lowest, will it actually still use 1hp? I mean does the amount of electricity that an airconditioner uses depend on the load?

The rating of air-conditioners in horse power is an outdated one, though still used by retailers, where it is the mechanical power of the compressor motor, and once was used as a way to show what value for money was being obtained (the size of the motor). Now we tend to focus more on efficiency, cooling power versus electrical power.

Modern ratings are in kW of cooling, meaning the amount of heat that can be pumped.
In the US, traditional units of BTU are used for cooling capacity, which are actually BTU/h. The conversion is 3.412

Cooling capacity of 1hp system:
A reasonably efficient 1 hp air-conditioner might provide 2.5KW of cooling, so the BTU rating is 8530 BTU/h approx. This is typical as 1hp is 746W, and the pumping of heat due to 746W is usually 3 to 4 times that. This example is 3.35 times, and that is something like the mechanical efficiency expected for a split inverter system, though window units tend to be less efficient. (see the link below).

Electrical power used:
The electrical power used by a single phase 1hp motor may be 1kW, and there is additional power for the fan motor, so the overall power consumption is something like 1.2kW when the compressor is running and 200W (0.2kW) when only the fan is running. The compressor only runs long enough to provide the cooling that is required, which depends on internal temperature, external temperature, heat load (heat coming into the room from windows, doors, people, lights, computers etc.) and your thermostat setting. Setting a higher temperature means the compressor runs less, and you save power. This is usually a lower cooling setting, as you said.

Energy Used:
Energy is measured in kWh, which brings time into the cost of electricity. If your compressor runs 30% of the time in a 24h period, the consumption over 24 hours is:
0.2kW * 24h = 4.8kWh for the fan
1kW * 8h = 8kWh for the compressor.
Total is 12.8kWh (electrical units on your bill) in a 24 hour period.
Yes the energy used over time does depend on the load and the setting.

Inverter units:
So called inverter units have a variable speed compressor motor that runs continuously, and probably uses 3 phase from the inverter instead of single phase, but the average energy used over time is much the same as cycling the compressor in the analysis above. Efficiency advantages can come from the change in motor type, and eliminating brief stop/start periods of heavy current with no contribution to cooling. The claimed advantages of inverter units (from wikipedia) are:
"Eliminating stop-start cycles increases efficiency, extends the life of components, and helps eliminate sharp fluctuations in the load the air conditioner places on the power supply. Ultimately this makes inverter air conditioners less prone to breakdowns, cheaper to run, and the outdoor compressor is generally quieter than a standard air conditioning unit's compressor."

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