Inverter Types - AC vs. Multi-Split AC

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The Inverter on an air conditioner signifies the ability of the unit to continuously regulate its thermal power flow by altering the speed of the compressor in response to cooling demand.

Traditional reverse-cycle air-conditioners use a heat pump that is either working at maximum capability or switched off, as the compressor's speed cannot be varied. ure

The inverter uses a variable-frequency drive to control the speed of the compressor motor. The Inverter provides pulse-width modulation of the DC current to produce AC current of a desired frequency controlled by a thermostat. The AC current is used to drive a brushless motor or an induction motor. As the speed of a brushless motor is synchronised to the frequency of the AC current, it is thus possible to build a compressor that can be run at different speeds.

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 break downs, cheaper to run and the outdoor compressor is generally quieter than a standard air conditioning unit's compressor.

Inverter-based air conditioners have their strengths in environments where a partial load is common as they are significantly more efficient than conventional air conditioners in these situations. For most households inverters are the preferred option as partial load is the common mode there. The higher initial expense is balanced by lower energy bills. In a typical setting the pay-back time is about two years.

Therefore, it depends on usage what type will be better. In any case though, it pays to buy an energy efficient model, i.e. one with a high SEER, EER or HSPF factor and at least an EnergyStar certified product, as this will significantly reduce the electricity bill.

Multi Split Air Conditioners draw from the main unit and each sub-unit's temperature and airflow is controlled at each sub-unit and the total load is handled at the main unit according to overall demand.

Jon