Ruks Engineering Ltd. IAQ Systems

Indoor Air Quality Association(IAQA)		0.05 PPM (50PPB)
World Health Organization(WHO)		0.05 PPM (50PPB)
ASHRAE (American Society of Heating, Refrigerating and Air conditioning Engineers)		0.05 PPM (50PPB)
Food and Drug Administration (FDA)		0.05 PPM (50 PPB)
Occupational Safety and Health Administration (OSHA)		0.10 PPM (100PPB)
National Institute of Occupational Safety and Health (NIOSH)		0.10 PPM (100 PPB)
Environmental Protection Agency(EPA)		0.08 PPM (80 PPB)
PPM (Parts Per Million), PPB (Parts Per Billion)

DESCRIPTION OF CONTROL METHOD TO KEEP THE RESIDUAL LEVEL OF OZONE WITHIN PUBLIC HEALTH STANDARDS

Ozonation system will have the following components to control and remove the indoor air pollution.

Plate Type Corona discharge ozone generator (Not annular type corona tube)
Duct mounted type ozone generator and not portable type generator that tube produced ozone into the duct.
Volatile Organic Compound (VOC) sensor
Ozone(O3) residual monitoring sensors

Operation and Control System:

An ozone generator (with single or multiple plate type corona discharge surface) can be installed in the supply or return air duct. Based on the pollution level of the occupied space, the VOC sensor detects the prevailing VOC level and communicates with the ozone generator controller, based on the level of pollution the controller will provide power to the ozone generator to produce ozone at low concentrations. The low concentration of ozone is produced by the surface area of the corona discharge plates (The plate type coronas are used, instead of the annular type as the controllability of ozone production can be controlled to a fine level using the area of the plate, as we are dealing in PPB levels). The production of ozone will occur only when pollutants are present, hence the chance for ozone levels to exceed high levels are very remote or none.

An ozone sensor in the return air duct will monitor the residual level of the ozone and shut down the ozone production in the event it exceeds 50 PPB.

An ozone sensor installed between the ozone generator and the 1st air out let to the occupied space will alarm if the level in the duct exceeds 50 PPB.

The VOC level and the Ozone levels can be constantly monitored by the BMS. The ozone system has it's own independent automatic control system, hence the control system will prevent ozone levels going above the public health standards.

Introduction | Feasibility Study | Ozone Levels, Permissable Safe Limits, Methods of Control
Selection of Generators | Specifications | Drawings | Reference | Schematic Drawings
Ozone Generators | C02 Monitors | Ozone Monitors | VOC Monitors