Device and method for controlling a supply air flow at an air treatment system

1. An air treatment device ( 1 ) for control of a supply air flow (L 1 ) to a premises (A) and for conditioning of the supply air flow, the air treatment device ( 1 ) comprising:

a chilled beam ( 2 ) being connected to a supply air duct ( 3 ) in an air treatment system ( 4 ),

the chilled beam ( 2 ) comprising a pressure box ( 5 ) with at least one inlet ( 6 ) for inflow of the supply air flow (L 1 ) from the supply air duct ( 3 ) to the pressure box ( 5 ), and a plurality of outlets ( 7 ) for outflow of the supply air flow (L 1 ) out of the pressure box ( 5 ) to a mixing chamber ( 8 ),

the plurality of outlets ( 7 ) being arranged according to a configuration which is changeable by that at least one cover member ( 9 ) displaceably arranged in relation to the plurality of outlets ( 7 ),

the chilled beam ( 2 ) comprising at least one liquidly coupled heat exchanger ( 10 ) arranged to alternatively cool or heat a through-flowing air stream by heat exchange,

through which heat exchanger ( 10 ) a circulation air flow (L 2 ) from the premises is arranged to flow (A) due to induction effect driven by the passage of supply air flow (L 1 ) out of the plurality of outlets ( 7 ) to the mixing chamber ( 8 ),

the mixing chamber ( 8 ) being arranged to unite the supply air flow (L 1 ) and, via the heat exchanger ( 10 ), the conditioned circulation air flow (L 2 ) into a common air stream (L 1 +L 2 ) and guide the common air stream (L 1 +L 2 ) to at least one outlet opening ( 11 ) for outflow to the premises (A),

the air treatment device ( 1 ) further comprising at least one actuator ( 12 ) for control of a volume flow of the supply air flow (L 1 ),

the pressure box ( 5 ) comprising at least one pressure measuring socket ( 13 ), useful for representative control of static pressure (ps) in the pressure box ( 5 ), and

the air treatment system ( 4 ) comprising at least one room sensor ( 14 ), which is arranged to register room conditions in the premises (A) and communicate the room conditions to the air treatment system ( 4 ) for control of the air treatment device ( 1 ),

wherein the air treatment device ( 1 ) is arranged to register the static pressure (ps) in the pressure box ( 5 ) and a position of the actuator ( 12 ) and, based on the static pressure (ps) and the position of the actuator ( 12 ), calculate a real supply airflow (L 1 ) in the chilled beam ( 2 ), and the actuator ( 12 ) is arranged, at an identified need, to change a configuration of the plurality of outlets ( 7 ) by a linear motion of the cover member ( 9 ) so as to change an open area of the plurality of outlets ( 7 ) and change the supply air flow (L 1 ) by displacement of the cover member ( 9 ).

2. The air treatment device according to claim 1 , wherein the actuator ( 12 ) is arranged to register the static pressure (ps) in the pressure box ( 5 ) and the position of the actuator ( 12 ), and further, based on these, arranged to calculate the real supply airflow (L 1 ) in the chilled beam ( 2 ) by software ( 15 ) in the actuator ( 12 ).

3. The air treatment device according to claim 1 , wherein a pressure sensor ( 16 ) is arranged to register the static pressure (ps) in the pressure box ( 5 ), and the actuator ( 12 ) is arranged to, based on that and the position of the actuator ( 12 ), calculate the real supply airflow (L 1 ) in the chilled beam ( 2 ) by software ( 15 ) in the actuator ( 12 ).

4. The air treatment device according to claim 1 , wherein the air treatment system ( 4 ) comprises software ( 15 ) for registration of the static pressure (ps) in the pressure box ( 5 ) and a position of the actuator ( 12 ), and which software ( 15 ) is, based on these, arranged to calculate the real supply airflow (L 1 ) in the chilled beam ( 2 ).

5. A method for control of supply air flow (L 1 ) to a premises (A) and for conditioning of the supply air flow (L 1 ) by means of an air treatment device ( 1 ) which comprises a chilled beam ( 2 ) connected to a supply air duct ( 3 ) in an air treatment system ( 4 ), the chilled beam ( 2 ) comprises a pressure box ( 5 ) with at least one inlet ( 6 ) for inflow of supply air flow (L 1 ) from the supply air duct ( 3 ) to the pressure box ( 5 ) and a plurality of outlets ( 7 ) for outflow of the supply air flow (L 1 ) out of the pressure box ( 5 ) to a mixing chamber ( 8 ), the plurality of outlets ( 7 ) are arranged according to a configuration which is changeable by that at least one cover member ( 9 ) which is displaceably arranged relative to the plurality of outlets ( 7 ), the chilled beam ( 2 ) comprises at least one liquidly coupled heat exchanger ( 10 ) arranged to alternatively cool or heat a through-flowing air stream by heat exchange, a circulation air flow (L 2 ) from the premises (A) is arranged to flow due through the heat exchanger ( 10 ) to induction effect driven by the passage of supply air flow (L 1 ) out of the plurality of outlets ( 7 ) to the mixing chamber ( 8 ), the mixing chamber ( 8 ) is arranged to unite, via the heat exchanger ( 10 ), the supply air flow (L 1 ) and the conditioned, circulation air flow (L 2 ) into a common air stream (L 1 +L 2 ) and guide the common air stream (L 1 +L 2 ) to at least one outlet opening ( 11 ) for outflow to the premises (A), the air treatment device ( 1 ) comprises at least one actuator ( 12 ) for control of a volume flow of the supply air flow (L 1 ), and the pressure box ( 5 ) comprises at least one pressure measuring socket ( 13 ), useful for representative control of static pressure (ps) in the pressure box ( 5 ), and the air treatment system ( 4 ) comprises at least one room sensor ( 14 ), which is arranged to register the room conditions in the premises (A) and communicate the room conditions to the air treatment system ( 4 ) for control of the air treatment device ( 1 ),

the method comprising:

measuring the static pressure (ps) in the pressure box ( 5 ),

registering the position of the actuator ( 12 ) for determining an actual configuration of the plurality of outlets ( 7 ) which gives an actual k-factor,

calculating the real supply air flow (L 1 ) for the chilled beam ( 2 ) based on the static pressure (ps) in the pressure box ( 5 ) and the position of the actuator ( 12 ),

measuring/registering an actual status of the room conditions in the premises (A) by the room sensor ( 14 ),

comparing the real supply air flow (L 1 ) with a set point for the actual room condition,

at a detected need change to a configuration of the plurality of outlets ( 7 ), moving the cover member ( 9 ) in relation to the plurality of outlets ( 7 ) by linear motion of the cover member ( 9 ) via the actuator ( 12 ), to change the supply air flow (L 1 ) by which motion an open area of the plurality of outlets ( 7 ) changes for outflow of supply air flow (L 1 ).