CHILLED WATER COIL
WATER - INSIDE TUBES
AIR - OVER TUBES & FINS
Ø HEAT EXCHANGE ACROSS TUBES AND FINS IS DEPENDENT ON
THE TEMPERATURE RISE
OF THE WATER OR BRINE SOLUTION.
Ø NO CHANGE OF STATE OCCURS ONLY SENSIBLE HEAT EXCHANGE RESULTS.
Ø THUS THE HEAT TRANSFER PRIMARILY DEPENDS ON SPECIFIC HEAT
OF THE FLUID
FLOWING WITHIN TUBES.
Ø WATER/BRINE
TEMPERATURE KEEPS CHANGING BETWEEN
INLET TO OUTLET
A chilled water coil is a component of an HVAC (Heating, Ventilation, and Air Conditioning) system that is used for cooling air. It is typically made of copper tubes or other materials that allow the flow of chilled water. The coil is designed in a serpentine pattern to maximize the surface area contact with the air.
Here's how a chilled water coil works in an HVAC system:
Chilled water supply: The chilled water is supplied from a chiller, which is a refrigeration unit that cools the water to a low temperature, usually between 40 to 45 degrees Fahrenheit (4 to 7 degrees Celsius).
Air handling unit: The chilled water coil is installed inside an air handling unit (AHU) or ductwork. The AHU contains a fan that draws air from the space that needs to be cooled.
Air circulation: The fan pulls the warm air from the space through the AHU and forces it to pass over the chilled water coil. As the warm air comes into contact with the cold surface of the coil, heat is transferred from the air to the chilled water flowing inside the coil.
Cooling effect: The transfer of heat from the air to the chilled water causes the air temperature to drop. The cooled air is then supplied back to the space through ducts or vents, providing a comfortable environment.
Return water: After absorbing heat from the air, the chilled water exits the coil and returns to the chiller to be re-cooled. This cycle continues as long as the HVAC system is operating.
Chilled water coils are commonly used in large-scale HVAC systems found in commercial buildings, hospitals, hotels, and industrial facilities. They offer efficient cooling by utilizing water as a medium for heat exchange, and they can be integrated with other components of the HVAC system to provide precise temperature control and maintain indoor comfort.
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