Ahu Chilled Water Coil

How an air handler works ahu basics.

Ahu chilled water coil.

When the chilled water leaves the cooling coil it will now be warmer at around 12 c 53 6 f. 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. August 3 2020 december 9 2019 by trey. Magic aire s ndb is a low sound energy efficient air handling unit providing multiple options for comfort conditioning and fan control.

Water cooled chillers are typically located in the basement or lowest floor of a building. There are some residential air handlers that use either a hot water heater or a boiler for a hot water coil located in the air handling unit. That percentage reduction varies based on each coil s unique dimensions but a reliable estimate is a loss of 8 12. The chilled water heats up and the air blowing across it cools down.

This type of chiller needs a cooling tower to reject the heat from the building. Comfort is so much more than temperature. 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. Air handlers are part of a system using either a chiller with cooled water or a condensing unit in a direct expansion dx system.

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. Simply piping the coils in the correct manner from the beginning would seem to be the. Chilled water coils are one of the most common mediums for cooling air. The purpose of the valve is to control the amount of chilled water flow going through the coil.

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. In some cases we have to dismantle air handling units because of the difficulty in cleaning them. 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.

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.