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CONFERENCE ROOM HIGH FLEXIBILITY

Conference room with control of ventilation, cooling, heating and lighting.

The designation conference room or meeting room can be quite broad. It can mean everything from a smaller meeting room with four chairs to a large conference room that will act as the boardroom and the property's "jewel in the crown". Below, we have described a normal conference room that has façade contact and thereby both heating and CO2 sensors. If the conference room is in the core of the building, often neither heating nor CO2 sensors are required.

Flexibility
As the TTC supply air diffuser has all of the sensors built in to the diffuser and does not require any installation on the walls, extremely high flexibility and simple management are obtained when walls are to be built, moved or removed. A conference room can simply be two office rooms or large offices. The fact that the sensors are not wall-mounted also gives a quicker time constant on the temperature sensor, and tampering is avoided.

Ventilation
The TTC supply air diffuser controls the ventilation with the help of the built-in sensor for occupancy, temperature and flow (also pressure). When the room is empty, the system goes into economy mode with a very low flow so that it doesn't become chilled even if there is 15 degree supply air during the cold season. The room goes into comfort mode when the occupancy detector is triggered (after an adjustable time delay). The flow is then raised to an "occupancy flow" (typically this is set so that energy balance is achieved when three people are present); when there is excess heat the air flow increases to achieve the right temperature. For maximum energy saving, strongly under-temperature air is used to reduce the fan electricity consumption as the flow becomes lower.

Silent

The design of the diffuser means that the diffuser can reduce very high pressures without noise problems, which means that it is suitable for renovation projects where existing ducts can be exploited without risk of excessively high noise levels.

Heating
The diffuser can control heating in sequence with radiator actuators and also functions with thermostats, but it can then be more difficult to exploit economy mode when the office is not occupied; there can also be a risk that heating and cooling will operate simultaneously. However, this scenario can be easily detected with our web server LINDINSPECT.
TTC can also work with over-temperature air with good mixing, but if the supply air temperature cannot be adapted for different parts of the property, this tends to be a rather "insensitive" solution. If you choose both heating and cooling with air, the conference room should be equipped with cooling/heating coils for the best comfort level.

Lighting
Lighting control in a conference room can be done in a number of ways. If a simpler solution is required for a conference room, it can be equipped with a CBR (or SBR) relay box that supplies a Switchdim solution making it possible to dim the lighting and at the same time switch off the lighting if no people are present. If a more advanced solution is required, for stages etc., the relay in the CBR can instead be used for a separate occupancy detector and then the solution can be built separately.

Cellular office with supply air via the TTC active supply air diffuser that uses a built-in regulator and sensor to regulate temperature and air quantity in the room by increasing or decreasing the slot size between the blades in the diffuser section. Pressure and flow sensors and encoders on the motor ensure extremely accurate flow regulation and make possible pressure optimization of the aggregate. The flow is set at three different levels: absence, occupancy and maximum flow. The built-in occupancy detector also controls economy and comfort modes after an adjustable time delay.

Extract air
Extract air with DCV-FB damper control with flow balance regulation through the flow that is communicated by digital bus. Adjustable offset can compensate for fast flow.

NOTE - NEW PRODUCT!
DCV-BL - To be introduced during winter 2015.
DCV-BL will replace DCV-SL and DCV-FB in comfort solutions.

Heating
Via the CBX connection box, the supply air diffuser regulates the A4004 valve actuator on the radiator. Adjustable cold draught protection. The flow temperature and circulation pump on/off for heating can be optimized. Either each radiator is connected to the closest supply air diffuser so that future division of the room will be straightforward, or several radiators are connected in parallel to a CBX box and all diffusers are programmed to belong to the same temperature zone.

Extra heating/cooling steps
Further heating or cooling steps can be connected in the CBX box for extreme operating modes.

Extra sensors
CO2 or air quality sensors can be connected in the CBX box. This input can also be used for other sensors if required. The sensor signal is used to regulate an adjustable P band.

Lighting
The CBR lighting control box or SBR is used to connect push buttons and 230 VAC to the lighting. The lighting is turned on and off either via a signal from the occupancy sensor placed in the supply air diffuser or from connected push buttons. The time to automatic switch-on (one operating mode) can be set, as can the time to switch-off after the last recorded movement.
For dimming of the light, a Switchdim switch is connected in series with the relay box.
The number of on and off operations and the number of hours with lighting illuminated are registered for measurement of the number of burning hours for the armature and thereby the optimal time for replacing fluorescent tubes.

Conference room - high flexibility: Electrical installation supply and communication cable. It is pre-terminated in the diffuser's diffuser section with ready-made contacts in the other end for rapid installation. For other products, it is connected in the same way throughout.

Cable lengths
The bus cable can be pulled for long distances in respect of communication, but the voltage drop must be taken into account for voltage supply. See electricity design guide.

The limiting factor for cable length is that each CMA ("communication hub") can only have 100 nodes/products installed on it.

Power supply and transformers
In a normal situation, one transformer is installed per 12-15 diffusers/products but this is a rule of thumb that applies with short distances between products. See electricity design guide.

In some cases, you may wish to place a larger transformer in cable recesses instead of many smaller ones deployed throughout the installation. This can be done, but you must take note of the voltage drop in cables, and you will need separate thick 24 VAC cables on cable ladders...

Different installation principles for easiest/cheapest installation
Instead of pulling the cable on a ladder outside the cellular office, you can pull the cable in line into the room to avoid having to go in and out of the room.

If the CBR box is to be installed for lighting control, it is useful to use some kind of FMP bracket assembly product for pre-assembly and shorter installation times. An SBR box can be placed anywhere on the bus line.

As long as the cooling capacity is set to approx. 80 W/m2, there is no problem with draughts in the occupied zone. With a recommended distance of approx. 3000 mm between centers of two diffusers, there is no problem with draughts.

However, very high cooling capacities for small surfaces are often required in conference rooms. In this case the diffuser's ability to tilt the slits is exploited, i.e. to spread the air asymmetrically. Ideally, the air is directed so that it streams against one of the short sides, which are often outer walls where the occupied zone stops 500 mm from the wall. Then the draught problem is avoided in a simply way.

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