Smart climate control - Extract air balancing | Lindinvent
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EXTRACT AIR BALANCING TRANSMITTED AIR

An example with transmitted air to a corridor.

Transmitted air
The most common and cheapest option for balancing airflow in individual spaces is via transmitted air. The rare situations where this is not suitable are healthcare premises and premises with very high demands on sound insulation.

In smaller offices, a diffuser of the normal type, for transmitted air, works very well. For conference rooms or where larger air flows are required, sound insulated transmitted air is an alternative, i.e. a larger grille on each side of the wall with a sound insulated spiral duct in between.

Active extract air balancing
Lindinvent's climate control operates with active extract air balancing. Here, the sum of supply air flows from several cell offices is balanced via DVC-BL.

All active supply air units connected to the communication loop communicate their current supply air flow and their associated airflow zone. Airflow controller FBL, which is part of DCV-BL, sums up all flows related to the current zone. The regulator can add/subtract a nominal offset in order to compensate for any WC groups or the like.

Energy-saving extract air control
By placing flow measurement equipment so that all exhaust air flows are measured but only the varying flow is controlled (see picture below), better measurement accuracy and lower minimum flows are achieved, which saves energy.

Extract air control with DCV-BL.

The smart damper DCV-BL, which is commissioned for flow balancing, balances the supply air flows that are communicated digitally on the CAN-bus/communication loop. An adjustable offset compensates for any fixed flows. A flow zone usually consists of flows from one or more supply air devices, all of which must be balanced by the same extract air control.

Here DCV-BL is balancing the sum of supply air from each active diffuser TTC.

Cable
The cable used to connect devices to a communication loop (CAN bus) is a PVC-free shielded 4-wire combined feed and communication cable.

Cable lengths
The CAN bus cable can be drawn long distances with respect to communication, but in order for the power supply to be at acceptable levels, the voltage drop must be considered.

Power supply and transformers
In a normal situation, a 230/24VAC transformer is installed per 12 to 15 nodes on the CAN bus section. This is a rule of thumb that applies at short distances between the nodes. See the design guide El for guidance.

Pre-assembled smart dampers
Circular designs of the smart damper DCV-BL (as well as other circular smart dampers) are supplied with regulator and damper motor pre-mounted on the damper. The unit only requires connection of the combined feed and communication loop.

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