D-Tech Variable Flow System

The CSA-approved D-Tech control system as a whole enables control of a commercial hood’s ventilation system in terms of both exhaust and deploying an NFPA96-compliant control sequence if the fire protection system is triggered.

D-Tech Control systems are designed to be connected to sensors installed in commercial hoods in order to predict cooking activity and adjust the exhaust and air supply rates according to the cooking zone.

Advantages

The advantage of controlling the exhaust and the air supply in advance based on actual cooking activity is that it allows substantial energy costs savings. These savings are directly ralated to heading of supply air during cold weather, air-conditioning during hot weather and energy consumption by the motors.

Optimizing the exhaust flow improves occupants’ comfort and reduces the noise level. Another benefit is that system allows modulation of air flow via heat detection. D-Tech radars Enhance the performance of the variable flow system when there is movement under the hood, and speed changes are anticipated by means of motion detection. This represents a major competitive advantage by giving the frequency modulation converter precious seconds to reach a higher exhaust output desired at the moment smoke emanates from the cooking units.

Our years of experience in commercial kitchen thought us that it is best to anticipate the arrival of smoke instead of measure its density with optical scanners inside the hood. What’s more, the system has several detection and modulation options and is 100% customizable, fast and economical.

Heat detection via temperature sensors and motion detection via D-Tech radars

How it works :

The exhaust and supply fans motors must be linked to frequency converters. The D-tech control system measures cooking activity by means of its patented D-tech motion sensor and a temperature probe located in the hood’s upper wall.

Activity is measured based on several parameters, such as temperature and motion detection in the cooking zone, as well as a pre-determined schedule.

Each temperature and D-tech sensor is fully programmable in terms of sensitivity range, acceleration speed and operating hours at low and high speed.

Temperature sensors:

Each PT1000 thermistor-type temperature sensor is installed on the ceiling of the hood using a certified sealing ring. The higher the temperature, the greater the exhaust demand will be.

D-tech sensor:

The performance requirements are directly related to the presence of the people operating various cooking appliances. This type of proactive detection allows more effective control of equipment which rapidly generates large amounts of smoke such as fryers, pots and combination ovens. When staff approach a cooking appliance, their presence is detected much faster than the other systems on the market. These valuable extra seconds give the evacuation system more time to accelerate, so that it may fully capture rapidly emitted cooking vapours. The D-tech sensor’s coverage range may be adjusted using its integrated potentiometer.

Hub and SuperHub:

Based on the project type, a Hub- or SuperHub-type unit will be used. The Hub is a junction box enabling one of a hood’s various sensors to be linked to a centralized circuit board. The Hub can communicate with either the D-Tech controller or a Super Hub.

The SuperHub is a remote unit with a communication link to the D-Tech Controller.

The SuperHub enables control of hood’s lighting and modulating exhaust damper as well as integration of signals from another Hub.

Connectivity:

The D-tech sensors, temperature sensors and the modulating Damper on the same section of the hood are connected via an RJ45 wire to the Hubs/ SuperHubs. Sheilded RJ45 wires are used between Hubs/ SuperHubs. The D-Tech Controller can communicate with the frequency converters via dry contact and 0-10V analogue signals.

The D-tech controller can also be integrated by means of communication with an ABB ACH550 frequency converter and the Schneider Electric Altivar series.

Do not hesitate to request an evaluation of the equipment cost vs. return on investment from our team of specialized professionals.

Case studies

Hood plan

Plan of cooking equipment

Operation average : 69,2929721

Savings : 30.71%

Operation average : 66,748019

Savings : 33.25%

Estimated annual savings : 3893$
Amortization period: 1.46 years

WARNING : Remember these variable parameters :

number of operating hours
Energy cost (electricity and gas prices)

For more information on subvention

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D-Tech Variable-speed hood vents System