Ahu Chilled Water Coil

Chilled water coils are one of the most common mediums for cooling air.

Ahu chilled water coil.

When cooling air part of the energy is used to separate the water latent heat and the rest is used to lower the air temperature sensible heat. That percentage reduction varies based on each coil s unique dimensions but a reliable estimate is a loss of 8 12. In some cases we have to dismantle air handling units because of the difficulty in cleaning them. Simply piping the coils in the correct manner from the beginning would seem to be the.

Water cooled chillers are typically located in the basement or lowest floor of a building. When the chilled water leaves the cooling coil it will now be warmer at around 12 c 53 6 f. The chilled water heats up and the air blowing across it cools down. If you opt to not counter flow a chilled water coil you ll have to reduce the coil s overall performance by a certain percentage.

The coils can be either hot water coils chilled water coils or direct expansion coils with the direct expansion coils used as an evaporator coil in a refrigeration circuit. Comfort is so much more than temperature. Cooling moist air sensible cooling if the temperature on a cooling surface t c is above or equal to the dew point temperature t dp of the surrounding air the air will be cooled without. How an air handler works ahu basics.

The purpose of the valve is to control the amount of chilled water flow going through the coil. Air handlers are part of a system using either a chiller with cooled water or a condensing unit in a direct expansion dx system. This type of chiller needs a cooling tower to reject the heat from the building. As warm air passes across the coil and comes in contact with the cold surface of the fins heat then transfers from the air to the water flowing through the tubes both cooling and dehumidifying the air.

This video depicts a technitian inside of a unit properly cleaning a chill water coil. August 3 2020 december 9 2019 by trey. The chilled water enters the ahu fcu and passes through the cooling coil a series of thin pipes where it will absorb the heat of the air blowing across. Dictated by local codes and based on the application each air handler will have a different set of needs including but not limited to fresh air intake humidity control heating filtration and energy recovery.

The chiller produces chilled water and pushes this around the building to air handling units ahu s and fan coil units fcu s etc.