What is an interlaced DX coil?
Unique interlaced circuiting option assures uniform refrigerant distribution over the entire face area of the coil. Wide fin spacing availability reduces the affect of frost build up in low temperature applications. For use in central systems or duct application.
What does DX coil mean?
In my last post, I covered condenser coils, which are found in outdoor units. This week, I’ll focus on evaporator coils, also known as direct expansion (DX) coils, which are found in indoor units. The two coils work together and are often located in close proximity to each other within an HVAC system.
What is meant by the coil split HVAC?
To split a coil, you put two complete and separate fin/tube coils in a single casing. By doing so, two compressors can operate off the same coil, and you can even shut one down when the load doesn’t require it.
What is the difference between DX system and chilled water system?
What’s the Difference Between DX Units and Chilled Water Units? The immediate and most noteworthy difference between these two systems is that the DX units cool air using refrigerant and CHW units cool air utilizing chilled water.
What is a dual circuit coil?
Dual Refrigeration Circuits The circuit utilizes a dual coil design that incorporates two sets of tubes into one set of fins inside each coil. This allows the two circuits to fit in the same size cabinet as a typical single circuit system.
How do DX coils work?
A DX unit uses refrigerant-based cooling and cools indoor air using a condensed refrigerant liquid. Direct Expansion means that the refrigerant expands to produce the cooling effect in a coil that is in direct contact with the conditioned air that will be delivered to the space.
What is a DX unit?
A direct expansion air conditioning system, or DX unit, directly cools the air supplied indoors using a condensed refrigerant liquid. They are less expensive, requires less space and has low noise levels.
Are AC coils supposed to be wet?
Under normal conditions, the moisture from your home’s air would gather on the outside of your evaporator coil and drip down into a drain pan, which is located below the coil. If your air filter is near your indoor air handler, it can get wet.
What are chilled water coils?
Chilled water coils also known as hydronic cooling coils are typically used to cool or remove moisture from air streams. The air to be cooled moves through the fins, and either water or an ethylene or propylene glycol solution move through the tubes.
What can a DX evaporator coil be used for?
DX type of central air conditioning systems are generally used to cool small buildings or the rooms on the single floor. DX evaporator coils are designed for use in air-side applications for cooling and dehumidifying.
Can a face split coil be used on a vav?
Depending on the number of compressors, piping arrangement and controls, this coil style can operate as an intertwined coil or a face split coil – all while accommodating four independent refrigerant circuits. This arrangement is commonly used in multi-zone and VAV units as well. Traditional Face Split.
Are there DX evaporator coils with multiple fins per inch?
DX evaporator coils are available with multiple rows, multiple fins per inch options, and can be configured with interlaced or face split circuitry for capacity modulation and capitalize on valuable energy savings.
How does intertwined circuiting in an evaporator coil work?
Intertwined circuiting feeds refrigerant evenly across the coil face under part-load. The coil retains up to 70% of the design capacity when one circuit is deactivated, because the entire fin surface provides cooling, keeping suction pressure high and allowing compressors to operate more efficiently.