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Car Park Ventilation - Control System Strategy

Car Park Ventilation - Control System Strategy

Description

The EcoVent Control System is a tailored solution, designed to efficiently manage the car park ventilation equipment. It helps maintain good air quality when the car park traffic is high and conserve energy when it is low.
  • Quick and easy to install and commission
  • Controller’s pre-set parameters increase and decrease the fan’s speed in proportion to demand
  • Will increase the energy efficiency of your car park
  • Helps maintain good air quality
  • Connects to the FIP
  • Full speed override function
  • Purge timer function
  • Can connect to a BMS for monitoring
  • The EcoVent controller can be factory pre-configured to suit specific car park requirements.
  • Automatic/off/manual modes of operation
  • Integrated smoke detection
The EcoVent Control System works in conjunction with the JetVent fans, CO and NOx pollutant sensors, variable speed drives, supply and exhaust fans and the BMS. The EcoVent Control System has been developed to help increase the energy efficiency of a car park, while ensuring the ventilation output is optimized. It will vary the operating speed of the car park fans according to when the requirements and demand in the environment develop.
When the CO or NOx pollutant levels within the car park reach a pre-set level, the ventilation fans begin to ramp up in speed. As the levels increase and decrease during the course of the day and night, the speed of the fans and therefore the ventilation rate also increase and decrease.
The EcoVent Control System can also be connected to the fire system in the building to manage the automatic starting/stopping of the fans when a fire is detected (depending on fire/smoke management strategies), and control the fans at the Fire Indicator Panel (FIP) by manual speed control.
Some buildings also require links from the Building Management System (BMS) to monitor the operation of the JetVent system in the car park.
EcoVent Control system
Step 5 (a) - Digital EC Control Systems
The system comprises of impulse fans that incorporate intelligent, highly efficient Electronically Commutated (EC) motors.
There are two types of Digital EC control systems.
(1). Digital EC JetVent fans and analogue VSD control for supply and exhaust fans
Digital EC JetVent fans with analogue VSD
(2). Digital EC JetVent fans and digital VSD control utilising ComLink.
Digital Ec JetVent fans utilising comLink
Benefits for both control strategies
  • Most cost effective solution
  • Minimal cabling as digital messages are used
  • Digital monitoring of Jetvent Fans
  • Easy installation
  • Easy commissioning
  • Lowest running costs
  • Excellent noise to airflow ratio
  • Soft starting motors
  • No VSDs or Sinusoidal filters required for Jetvent fans
  • Digital EC Control capability
    • Up to 24 EC JetVent Fans
    • Up to 48 CO/NOx sensors
    • Up to 24 integrated smoke detectors
Additional benefits of control strategy 2
  • Controller can monitor the VSDs for actual fan speed and detect any fault conditions that may occur. No additional control equipment is required for this monitoring
  • The VSDs can also be daisy chained on the ComLink allowing them to be located up to 1000m from the EcoVent Controller
  • Up to 6 VSDs can be connected to the ComLink in supply or exhaust mode.
  • Ability to digitally monitor JetVent fans and VSDs
Note:
  • Fantech sensors included in the Digital EC Control Systems have been designed specifically for this purpose. Please contact Fantech for suitability of any other sensor.
  • 120 ohms end of line resister should be used
Step 5 (b) - Analogue Systems
An analogue system comprises of impulse fans that incorporate AC motors. There are two ways of controlling these fans and three different control systems.
Methods of controlling an analogue system
Stepped approach (ie. High/low speed )
Two-speed control involves setting the fans to off, low or high speed with a two-speed motor and relays. The relays are switched by the controller and in turn power contactors to the motor windings. The relays are switched at various set points corresponding to sensor readings in the car park. This is a simple and low cost way of achieving basic speed control of JetVent fans in a car park.
JetVent - Analogue Systems Stepped approach
Ramped control of speed (i.e with variable speed control)
Variable speed control involves controlling the speed of the fans proportionally to pollutant levels in a car park. The EcoVent control system will control a VSD using a 0-10 Vdc analogue signal. This system of speed control is more energy efficient as it provides more precise control of the fan speed against pollution levels.
JetVent Analogue Systems Ramped control of speed
There are three types of analogue control systems
1) Two speed JetVent fans
Using relays to drive contactors connected to the fans
Applicable Fans Series: JV-CPA , JIU-CPC2, JIU-CPMF
Two speed JetVent fans
2) Variable Speed JetVent Fans
Using 0-10 Vdc outputs to proportionally drive VSDs
Applicable Fans Series: JV-CPA , JIU-CPC2, JISU-CPC
Variable Speed JetVent Fans
3) For car parks with ducted systems
This control system has been primarily designed to improve the energy efficiency of a ducted ventilation system in new and older car parks. It is a packaged and tailored solution that ensures the exhaust and supply fans are working at the speed required to maintain good air quality when the car park traffic is high and conserve energy when it is low.
This type of control system reads the signal from the CO or NOx pollutant sensors and relays these to variable speed drives that modulate the speed of the supply and exhaust fans
JetVent car parks with ducted systems
Elta Group