Evaporators are used in Air Conditioning systems. An evaporator is a device in a process used to turn the liquid form of a chemical substance like water or into its gaseous form or vapour. It works in the exact opposite way of a condenser; it turns the liquid refrigerant into gas thus lowering the heat content and making the flowing fan air much cooler in the process.
There are two different kinds of general evaporators available, both requiring evaporator coils
- Flooded evaporators
- Dry or Direct expansion evaporators
Functions Of Evaporator Coil
Evaporator coils are the most important part of an HVAC system’s evaporator. These coils are part of an air conditioner or a heat pump that absorbs the heat from the air in your house. An evaporator coil is responsible for picking up heat from the indoor air and transfers it effectively.
As we know that the job of the air conditioner is not to cool the air, rather to simply move the heated air from here to there. That is where the function of the coil comes in, to add it to the refrigerant. After coming out from the evaporator coil, the refrigerant flows through an insulated conduit to the outer AC unit, located outside or behind the house. Thus begins the job of the condenser coil.
Location of evaporator coil
The evaporator coil is located inside the air handler or the blower compartment, where it holds the entire chilled refrigerant and then the condenser moves into it. As the air from the blower coil moves over the coil, the cold refrigerant removes the heat, from your home’s air. Thus the refrigerant becomes warmer and travels to the condenser coil outdoors.
How long does an evaporator coil last?
Evaporator coils require proper maintenance, for consumers to use it to its full potential. If maintained properly, then it should last for 10 to 15 years depending on the usage, which is the ideal life of an evaporator coil and also comparable to the average lifespan of an air conditioning unit.
However, misuse and improper maintenance of the Ac unit can cut its lifetime shorter. If it isn’t being regularly cleaned then dust, dirt, insects, pollen grains, and such can move past the air filter and collect over the evaporator coil in due time. This will reduce the AC unit’s efficiency and lead to leakages and corrosion.
When does an evaporator coil go bad?
In 10 to 15 years the condition of the evaporator coil begins to deteriorate. As time goes on the coil’s inner lining starts to wear off due to erosion which leads to weakening of the metal. The outer lining also experiences the same corrosion, leading to damages and refrigerant leakages.
A few tell-tale signs of an evaporator coil going bad are listed
- There is leakage from your air conditioning unit.
- Weird sounds are coming from your AC units such as; banging, clanking, or hissing noises.
- The air conditioner stops working altogether, switching off completely.
- Your AC unit keeps turning on or off at random times.
- Warm air starts blowing through your air vents.
- Your HVAC unit has difficulty in cooling even after switching it on for long durations.
Cost of replacing an Evaporator coil
If a thorough cleaning cannot save the evaporator coil, then replacing it would be a good option. On average for replacing a coil for a home air conditioner, the prices range from Rs 400 to Rs 2500 depending on the type and manufacturer of the coil.
These prices do not include labour costs. These copper coils are available at a lot of places, including online shopping websites. It is a cost-effective method to fix your AC unit instead of purchasing a whole new Air conditioner.
Benefits of replacing the evaporator coil
- Replacing the evaporator coils is very cost-effective, better than getting it repaired, thus saving a lot of money.
- If your air conditioner is under warranty during the time of replacement, getting a discount is very easy.
- For old HVAC units, the replacement of these coils can add a lot to the overall lifetime of the system.