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Indoor Air Quality Management

Indoor Air Quality (IAQ) is a term referring to the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants.

The world focus has shifted from the environment to ‘Invironment’. This is a new terminology, being used increasingly to focus on the Indoor Air Quality (IAQ) and its effect on human health. While the outdoor environment continues to be of concern, the indoor environment is receiving increased attention as more information has become available on the presence and effect of indoor contaminants.

Indoor air pollutants are increasingly being associated with respiratory illness in humans. Concerus about potential public health problems due to indoor air pollutants are based on evidence that urban residents typically speed more than 90 percent of their time indoors, concentrations of some contaminants are higher indoors that outdoors, and for some pollutants personal exposures are not characterized adequately by outdoor measurements.

Air Ozone Systems with controlled ozone dosing in combination with Volatile Organic Compound Sensors and Controllers, & Ozone Monitors

Ozone reduces energy costs by:

  • Increasing the heat transfer efficiency of the chiller
  • Reducing makeup water to the cooling tower by permitting more cycles between blow-downs
  • Eliminating the cost and problems in ordering, shipping, handling, storage, and disposal of regular chemicals
  • Reducing power consumption by keeping the chiller heat transfer efficiency high through leaner condenser tubes

Main benefits of ozonisation include :

  • Improvement of the filter and coagulant capacities. This leads to a reduction of coagulant use and less backwashing of the filter. Water use can be decreased, because of an increase in water quality
  • Ozone oxidizes organic and inorganic matter in the water, without the formation of unwanted by products, such as chloramines
  • Chlorine scents can be fully diminished by ozone application
  • Ozone is a more powerful oxidant and disinfectant than chlorine.
  • Certain chlorine-resistant pathogens cannot multiply in water that is treated with ozone

Cooling Tower water treatment with Ozone

Advantages for Cooling Tower water treatment with Ozone

  • Eliminates the use of chemicals except for pH balancing
  • Ozone is produced on-site and requires no storage of dangerous chemicals;
  • Ends discharge liabilities and chemical storage record keeping
  • Destroys all types of microorganisms instantly; decomposes organic waste by oxidation
  • Micro-organisms cannot get resistant to ozone after prolonged use of ozone
  • Removes existing calcium carbonate scale by destroying the biomass glue bonding agent
  • High efficiency as disinfectant.
  • A residual ozone concentration of 0.1 to 0.2 ppm is in most cases very effective in keeping the cooling tower and the cooling circuit clean
  • Due to good bio-film removal capacities very effective against Legionella
  • No chlorinated compounds. Very low corrosion rates in the system
  • Environmentally friendly

Air & Water Source Heat Pumps for Domestic, Commercial and Industrial Hot Water production


Swimming Pool water heating with Heat Pumps

Benefits of ozone application for Swimming Pools

  • Swimming water quality can be sufficiently increased by ozonization.
  • Guarantees healthy swimming water.
  • Children’s immune systems may be affected by swimming in chlorinated swimming pools.
  • Allthough purchasing an ozone system is relatively expensive compared to other techniques, cost can be saved on a long term.

Indirect Direct Evaporative Cooling Systems

Direct Evaporative Cooling

With direct evaporative cooling, outside air is blown through a water-saturated medium (usually cellulose) and cooled by evaporation. The cooled air is circulated by a blower.

Direct evaporative cooling adds moisture to the air stream until the air stream is close to saturation. The dry bulb temperature* is reduced, while the wet bulb temperature** stays the same.

Indirect Evaporative Cooling

With indirect evaporative cooling, a secondary (scavenger) air stream is cooled by water. The cooled secondary air stream goes through a heat exchanger, where it cools the primary air stream. The cooled primary air stream is circulated by a blower.

Indirect evaporative cooling does not add moisture to the primary air stream. Both the dry bulb and wet bulb temperatures are reduced.

During the heating season, an indirect system’s heat exchanger can preheat outside air if exhaust air is used as the secondary air stream.