Smart climate control - Standard Cellular office | Lindinvent



Equipment in a standard cell-office to control ventilation, cooling, heating and lighting via the active diffuser TTC.

Normal ceiling height with enough room for Lindinvent's active supply air diffuser TTC mounted with a hidden plenum box over the suspended ceiling. TTC can also be mounted in a free-hanging plenum box with a visible channel pulling.

Cell-office equipped with Lindinvent's active supply air diffuser TTC. TTC offers a solution where the climate in the individual room can be adapted using the variable supply air flow and the device's built-in logic to control connected valve actuators.

The amount of air is regulated by actively raising or lowering the height between the lamellas in the diffuser section. The pressure and flow sensor together with the encoder on the damper motor ensures accurate flow control. The level of the air flow is regulated to meet the room temperature setpoint. The resulting air flow is somewhere between preselected and calibrated flow points. Levels are set after an absence, presence and maximum air flow. The built-in presence detector is used for activating the economy mode (the absence level of the flow is activated) or the comfort mode (the presence level is activated) after an adjustable time delay.

Extract air via transfer air to a corridor
Extract air balancing takes place via transfer air to the corridor. Extract air devices are located in the adjacent corridor where the smart damper DCV-BL balances the summed supply air flow from several rooms. Supply air flows and extract air flows are communicated digitally via the CAN bus.

Heating or cooling
A set of adjustable P-bands is used by TTC to regulate the office's climate in a way that avoids parallel heating and cooling. TTC activates the actuators for heat when the supply air cannot keep the climate in accordance with set points. There is no extra cooling system installed here. A cold draught protection function can be implemented.

Signals from built-in sensors are used by TTC to regulate the room climate according to setpoints.

TTC can flexibly control the office lighting via the presence sensor or via signals from other control units. Time for ignition from detected presence (an operating mode) can be set, as well as the time for switching off the lighting after the last registered presence. If a more advanced lighting solution is desired, with scenes etc., lighting control SBD can be used for a DALI solution.

The cable in use for linking units to a communication loop (CAN bus) is a PVC-free shielded 4-conductor combined supply and communication cable. Relay boxes and sensors etc are normally connected via connection box CBX using the same cable specification. The 4-conductors are used for power supply and signals when applicable.

Cable lengths
The CAN bus cable can be pulled long distances with respect to communication, but, for power supply to be at acceptable levels, voltage drop must be considered. See the electrical design guide.

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

Air movements
TTC brings a circular, cold and fresh supply air stream in along the ceiling in all directions. The room air is mixed with fresh supply air. The air is isothermic allready after approximately 1.5 metres from the diffuser outlet. The design, with movable lamellas, maintains the air velocity even at very low airflow levels. This is the way TCC maintains an effective injection of the room air into the fresh supply air. This is also the way TTC works to prevent cold air from dropping down, directly under the diffuser, to create draught.

The report shows that air streams upwards, in the occupied zone, and down, along the walls. These are the desired and expected routes. Air is moving downward - outside the occupied zone.  The occupied zone is defined as 20 cm from the inner walls and 50 cm from the outer walls.

Very few complaints
We have now installed many TTCs in varied spaces. The number of complaints concerning cold draught, where Lindinvent's TTC solution is implemented, is so few that we dare to claim that the system works. You can see why.

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