HEAT COILS
Heating, cooling and DX (direct expansion) coils are a type of heat exchanger mostly used in HVAC (Heating, Ventilation and Air Conditioning) systems to condition the air and maintain desired indoor climate conditions. The primary function of a coil is to facilitate heat transfer between the air and the fluid (refrigerant, water or steam) inside the tubes.
TYPES OF COILS
A heating coil, also known as a hot water or steam coil, is a component used to transfer heat from hot water or steam to air or another fluid. These coils are usually part of an air handling unit and play an important role in heating the air circulated in the system.
A cooling coil is a component commonly used in heating, ventilation and air conditioning (HVAC) systems as well as refrigeration systems. Its primary function is to cool or dehumidify the air passing over or around it by absorbing heat from the air or a specific area. The cooling coil is a crucial element in the air conditioning and refrigeration process.
The term “DX coil” is usually associated with VRF (Variable Refrigerant Flow) systems, a comfort air conditioning system. DX stands for “direct expansion” and this term means that the refrigerant flow in such systems expands directly within a closed system.
The DX coil is a component found in interior units in VRF systems. This coil is used to cool or heat the indoor air. It usually consists of copper tubes and aluminum fins. The DX coil has a structure where the refrigerant circulating in the system passes directly through this coil.
LAMELLA (FINS) MATERIALS USED IN COILS
• In coils, the surfaces are flat or wavy;
• Aluminum,
• Epoxy coated aluminum (blue and gold),
• Copper,
• Designed using stainless steel lamellas. Lamellar thicknesses may vary according to the need.
Heating, cooling and DX coils are produced in the desired size and capacity specific to customer needs. Coil designs, necessary calculations are made to select the most suitable product and the appropriate product is selected.
Pipe materials and diameters are also determined according to the process and the mold to be used. The coils are mechanically inflated in automatic machines to ensure full contact after the lamella stacking process. This increases the heat transfer surface.