Variable Volume

Accurex offers a variable  volume ventilation system tracks the cooking load and varies the exhaust and supply ventilation based on need. Since the cooking load varies throughout the day, your exhaust system doesn't need to run at the maximum cfm all day. Accurex understands that by varying the speed of the fans to track the cooking load, you will save money from reduced power and tempering costs. See figures 1-3 below.

Standard construction features:

  • The Melink variable volume kitchen ventilation system utilizes microprocessor controls and operates solely on demand
  • The system monitors the cooking operation and adjusts the exhaust, supply and rooftop unit fans so when the cooking load is reduced, the fans operate at a reduced level and saveenergy
  • Typical payback of 1-3 years
  • Save an estimated $2 or more per cfm/year from the reduction of design cfm
  • Improved efficiency by reducing fan speed
  • Ventilation equipment life is extended by soft starting, therefore reducing stress on belts and bearings
  • Reduced sound levels to improve employee comfort
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Figure 1 - In a typical kitchen, the ventilation equipment runs at the maximum cfm through the entire day based on a peak load calculation. Expensive tempered air is exhausted and supplied regardless of the cooking load.

Figure 2 - The cooking load through out the day varies significantly. The maximum ventilation requirements of the kitchen operation only account for a small percentage of the day. The gray area in Fig. 2 represents the savings potential for variable volume.

Figure 3 - A variable volume system will track the cooking load (red line) and vary the exhaust and supply ventilation. The area above the red line represents energy savings. The chart above shows an average daily cooking load.

Advanced Variable Volume System

  1. I/O Processor: Controls the lights, fans, and up to four hoods. It communicates to the electronic motor starters (VFDs) and can be manipulated using the keypad.
  2. Electronic Motor Starter (VFD): Receives a start/stop command and a 4-20ma signal from the I/O processor. It varies the fan motor speed between a minimum and maximum setting.
  3. Keypad: Provides daily operation functions and setup features.
  4. Temperature Sensor: Located in the duct collar behind the filters, it monitors the duct temperature. A signal is then transmitted to the I/O processor in order to vary the fan speed in proportion to the actual heat load.
  5. Optic Sensors: Monitor when actual cooking is taking place. After a 7% reduction is detected a signal is sent to the I/O pocessor to bring the fan motor to full speed until all the effluent is exhausted.

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