| 摘要 |
Method for controlled admixture of a subset of exhaust air flow (1 ) into a supply air flow (2), at an air handling unit (3). At indicated need of exhaust air admixture firstly a positive pressure balance (Δρ2) over a mixing damper (15) is secured, i.e. that the pressure is higher on an exhaust air side (4) of the mixing damper (15) than on a supply air side (5) of the same, with the criteria Δρ2 > 0 Pa and a-b < Δρ2≤ a+b Pa, where a is a optional set value and b is a optional interval value. Balancing is performed by controlling either an exhaust air damper (6) or an outdoor air damper (12), where which damper (6, 12) regulating is determined by the actual operating point, i.e. actual pressures around the mixing damper (15). When balancing is stopped or a time for balancing has expired, the mixing process starts, whereby the mixing damper (15) and the outdoor damper (12) works in parallel and in opposite phase, until a desired value, and wherein the exhaust air fan (9) in parallel secures the correct flow in the exhaust air flow (1 ) by speed-control. |
