Smart climate control - Cell-office | Lindinvent
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CELL-OFFICE LOW CEILING - FLAT DUCT

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

With a flat duct that protrudes slightly from the ceiling, you obtain the same function as with a normal ceiling diffuser. It functions just like a standard office room and with several advantages compared to the wall diffuser: significantly better spreading, better temperature homogeneity and less risk of drafts.

This solution also works for open plan office solutions with low ceiling heights, unlike the wall diffuser. The 360 degree air spread means that problems with conflicting air streams is avoided for normal cooling requirements, which is not the case with wall diffusers.

 

 

Function
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.

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

Lighting
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.

In rooms with low ceiling heights it is important to conceal the electrical installation. The cable is therefore pulled through the flat duct and runs into the side of the PBFA connection box.

Alternatively, a suspended ceiling is fitted that lies directly against the flat duct. This means that approx. 100 mm ceiling height is lost, but on the other hand all installations can be concealed beneath the suspended ceiling.

Cable
The cable in use is a PVC-free shielded 4-conductor cable that is used both for power supply and communication.

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.

In a rectangular channel, a ceiling-mounted air diffuser can be used. A good mixing can be achieved.

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