CO and No2 Noxious fume Control effectively and Economically

The Process is a logical and seamless system.

• Carbon monoxide sensors (for petrol car exhaust fumes) and Nitro-dioxide sensors(for diesel car exhaust fumes) are installed in the car park based upon a formula.
• The formula is based upon how the gas behaves (heavy / light etc ) and toxicity of the gas(Fumes)
• Each sensor is wired back to the controller (typically three wires per sensor)
• The Controller monitors the sensor inputs which are analogues value, expressed as a percentage.
• If the percentage is over a given amount for a given time the controller will send a signal to start the supply and exhaust fans of the car park
• The fans run for a given time
• These times and set points are as per AS1668 as per a minimum value
• The Variable Speed Drive Connected to the motor ensure a soft start up reducing energy costs and wear & tear on the mechanical plant
• The Control of the exhaust and supply fan motors are also interfaced (via a relay) with the base building fire trip control

Return On Investment

Every Car Park is different, typically, a return on investment is with one year.

We Are Using a Time Clock on Our Fans!

Time clocks are non-compliant with AS 1668, you either run the fans full time, during car park operation hours, or install a sensor based controller such as that outlined in the diagram above.

Do We Have to Install Variable Speed Drives?

No, the variable Speed Drive (VSD) will save you considerable dollars on start up of the fans. each time a Direct on line (DOL) fan starts it draws circa three times its full run current. Commercial building are typically charged at this high level because the wholesaler of energy has to deliver a network which can supply these higher amounts of current, even if it is just for a short period. Check with your energy retailer for more information and specifics to your building.

What is the Cost

The cost of the system is subject to several main parameters including (but not limited to) the following:

• The number of car parking spaces
• The physical size or area of the car park (these determine the number of sensors)
• The Size and number of the exhaust and supply fans which are to have the Variable Speed Drives installed
• The Location of the mechanical switchboard
• Connections to the existing Building Management System (if required)

We have a Building Management System

Connections to the BMS don’t have a huge effect on price subject to the BMS having an Open Communications Protocol or a proprietary one.
With an “Open Protocol” system such as BACnet, Lon Works, and Niagara, the connections are relatively straight forward and a graphic page is set up.
We would recommend connections or integration into the BMS as it will make trending energy use versus car park fan use much easier, offering greater analysis of your buildings operational systems.