Posted on: 29 July 2016Share
With time, an air conditioner's filter usually wears out. This reduces its ability to trap dust since the wear and tear can create holes that are big enough to let in dust particles. And since the air filter is an air conditioner's first and only defense against dust accumulation, failure to trap the dust particles usually leads to dust-related problems.
One of the most common of these problems is reduced cooling efficiency at the evaporator coil area. And since an air conditioner's ability to cool air usually allows it to reduce humidity levels in a home, the reduced cooling efficiency is bound to cause humidity control problems.
Dust accumulation and evaporator coil performance
The evaporator coil has one job: to facilitate cooling by creating perfect conditions for effective heat exchange between the refrigerant and the passing air. It is designed to be a low pressure area so as to maximize the amount of heat that the refrigerant absorbs when evaporating. It is also made of copper, which is a good conductor of heat, to guarantee efficient heat exchange.
Accumulation of dust particles on the surface of the evaporator coil usually takes away the made-from-copper advantage. This is because continued accumulation of the dust particles creates an insulating layer that then reduces the rate at which the refrigerant absorbs heat from the air passing over the evaporator coils.
Reduced cooling efficiency and humidity control
Normally, the cooling effect created by the evaporating refrigerant causes condensation to occur at the evaporator coil area. This reduces the amount of moisture in the air that the air conditioner dumps in the area that it is cooling, something that eventually reduces the room's humidity.
In an air conditioning system whose evaporator coil is covered in dust, the reduced heat-exchange efficiency that occurs because of the dust layer will reduce the level of condensation in the area. Less moisture will therefore be removed from the passing air. As a result, the air conditioner will have a hard time controlling the humidity of the place it is cooling. The increased humidity in your home may then lead to mold growth that may then trigger allergic reactions in your loved ones.
Changing filters for better humidity control
To prevent this from happening, change your air filters regularly. Doing so at least once after every three months will ensure that your air conditioner has a dirt-proof defense system. It will prevent the efficiency-reducing layer of dirt from covering the evaporator coils, something that will then improve the effectiveness of the dehumidification process of your air conditioner.
To learn more, contact an HVAC services company.