Condenser coils are used to reject heat from an air-conditioning or refrigeration system. Sometimes they are used with the intention to heat air streams. They are one of the four main components in the refrigeration or air-conditioning cycle. Refrigerant enters as a superheated gas and condenses in the coil tubes as the air is heated. The refrigerant leaves the coil as a liquid.
Some typical applications for condenser coils:
- Heat Rejection
- Comfort Heating
Condenser Coils come in a variety of shapes and sizes, but there are some properties that are common in most condenser coils:
Since condenser coils typically have a large surface area and a fairly high air to refrigerant temperature difference, only a few rows are generally required. We expect to see a condenser coil somewhere between 1 and 3 rows deep.
The condenser coil must be able to handle a significant amount of internal pressure. With R-410a, working pressures can be as high as 600psia. Smaller tube diameters can handle this kind of pressure more reliably. Also, smaller tube diameters can help ensure refrigerant velocity is high enough to keep oil moving through the coil. For those reasons, we like to size condensers with 3/8" tubes.
Connections for most refrigerant applications are copper sweat. Other types of connections are prone to leak, which is a big problem when working with refrigerants.