Ahu Chilled Water Coil

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.

Ahu chilled water coil. The chiller produces chilled water and pushes this around the building to air handling units ahu s and fan coil units fcu s etc. This type of chiller needs a cooling tower to reject the heat from the building. 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.

The chilled water heats up and the air blowing across it cools down. 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. Air handlers are part of a system using either a chiller with cooled water or a condensing unit in a direct expansion dx system. In some cases we have to dismantle air handling units because of the difficulty in cleaning them.

August 3 2020 december 9 2019 by trey. Chilled water coils are one of the most common mediums for cooling air. 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.

Magic aire s ndb is a low sound energy efficient air handling unit providing multiple options for comfort conditioning and fan control. 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. When the chilled water leaves the cooling coil it will now be warmer at around 12 c 53 6 f. 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.

This video depicts a technitian inside of a unit properly cleaning a chill water coil. The purpose of the valve is to control the amount of chilled water flow going through the 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. 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.

The more chilled water flow that flows through the coil the colder the coil gets and the colder the air gets as it passes through the coil.