Maximum Energy Efficiency
Demand Control Kitchen Ventilation (DCKV) or Demand Control Ventilation (DCV) Systems provide the best option for maximizing energy efficiency in Commercial Kitchen Ventilation (CKV) Systems. To meet the demand of the cooking appliances, Streivor UL Listed DemandAire Systems have the ability to vary the amount of power supplied to exhaust and supply fan motors from 0% to 100%.
24/7 Monitoring and Balancing
DCV Systems utilize special monitors to detect the state of the cooking appliances and/or the thermal plume that is generated by the cooking appliances. The data collected from the monitors is instantaneously analyzed by a Programmable Logic Control (PLC). The PLC uses the incoming data and Streivor’s proprietary algorithms to make determinations as to how much exhaust airflow is required for each CKV hood. The PLC then sends adjustment signals to Variable Frequency Drives (VFD) powering the exhaust and/or supply fans.
There are many types of monitors that are used in DCV systems to collect data such as temperature, pressure, infrared and/or optic monitors. The monitors are used to collect data from the cooking appliance, the cooking appliance thermal plume and from multiple areas in and around the CKV system. The types of monitors used will vary from one manufacturer to another and also from one CKV system to another. To maximize the performance of the DCKV system, it is critical to identify and utilize the monitor(s) that will work best for each CKV system. However, note that the placement and the ability to commission, service and or replace the monitors are equally as important as the monitors utilized.
Variable Frequency Drives
The VFDs receive input signals and make adjustments to the amount of power supplied to the fan motors based on the demand of the cooking appliances. The motor power adjustments increase or decrease the fans’ Revolutions Per Minute (RPM) which in turn increases or decreases the amount of airflow being exhausted from the CKV system.
Multiple Hoods on a Common Duct — UL Listed Motorized Balancing Dampers (MBD)
When multiple hoods are installed on a common duct, MBDs can be added to the DCV system to make additional energy saving adjustments to the CKV system. The PLC receives input signals from the monitors in each individual hood and determines the state of the cooking appliances and the amount of exhaust air that is required for the current demand of those cooking appliances. The PLC then sends adjustment signals to the VFDs and to each MBD. The VFDs make real time adjustments to increase or decrease the total amount of air that is required by the CKV system. Simultaneously, the MBDs make individual damper adjustments to vary the amount of exhaust airflow through each hood. Each hood can be operated in a range from 10% to 100% of its design exhaust airflow. As a result, a hood installed over cooking appliances that are not in use can have its exhaust airflow reduced by as much as 90%.
DCV Design & Customization
There are several key factors to consider when designing a DCV system: the desired amount of energy efficiency, (BMS) integration, as well as cost and return on investment. DCV systems can vary significantly in design and cost from basic systems which may include one cooking appliance, hood and fan, to more advanced systems which may include multiple cooking appliances, hoods and fans along with multiple additional features such as Human Machine Interface (HMI) controls, (BMS) Communication and/or Integration, CKV Fire Suppression System Monitoring and Integration, Calendars and Programmable Time Clocks. It is important to choose a DCV System that is customizable and able to meet the individual needs of each project’s energy efficiency and control requirements while staying within budget.