Selecting a model that matches the required heating and cooling capacity is important.
In selecting air conditioning equipment, the idea that simply increasing the "capacity" on the catalog specifications ensures reliability, or that selecting a smaller capacity leads to energy savings, is a significant misconception. Air conditioning units have a "rated operating range" (approximately 80-100%) where they can achieve the highest energy efficiency. This time, I will explain from a technical perspective the impacts that arise when the capacity selection is inappropriate for the actual air conditioning load.
1. The impact of "excess or insufficient" air conditioning capacity on efficiency
Understanding the heating and cooling load for each space is essential for selecting the capacity of the air conditioning unit.
In the case of insufficient capacity (selecting a model below the rated capacity):
The unit will always operate at full capacity (100%), making it difficult to reach the target temperature and likely increasing power consumption. This leads to decreased efficiency and higher electricity costs.
In the case of excessive capacity (selecting a model that is larger than necessary):
The unit will continue to operate at low load (approximately 50-70%). Depending on the model, there is a risk of decreased efficiency or frequent ON/OFF cycling.
In the case of appropriate capacity (selecting a model that fits the load):
The unit can maintain operation near the rated capacity (80-100%), resulting in the highest efficiency and excellent energy-saving performance.
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