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Indoor Air Quality
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Indoor Air Quality

March 28, 2011


Today, IAQ or Indoor Air Quality is the prime focus of Building Designers, Architects, HVAC Consultants and Health Professionals. Growing public interest in IAQ, the consequent hike in energy needs and thus, cost and related health problems like Sick Building Syndrome (SBS), Building Related Illness (BRI) have necessitated focus on improving the quality of conditioned air cost effectively.

The modern construction practices have led to airtight buildings which minimize the amount of fresh air entering and circulating within the building. This restriction impacts indoor air by allowing a build-up of air contaminants within the building that are not properly removed.

We spend 90% of our lives indoors, where air quality is frequently upto 10 times more polluted than the air outdoors. Conditioned indoor air without the inclusion of adequate amount of outside air can have a high concentration of respirable dust, pollen, mold , spores , bacteria, viruses and more. People working indoors often experience symptoms such as dryness and irritation of the eyes, nose, throat and skin, headaches, shortness of breath, hypersensitivity, allergies, coughing or nausea just to mention a few.

We generally notice poor Indoor Air Quality (IAQ) symptoms after several hours at work and feel better after we have left the building or when we have been away from the building for a weekend or a vacation.

Ventilate to improve Indoor Air Quality (IAQ)

 Increasing the Ventilation rate in the building can enhance the Indoor Air Quality. Ventilation is the process of dilution and removal of indoor pollutants by replacing stale air in any space with outside fresh air. The ASHRAE standard for acceptable indoor air quality specifies minimum ventilation rates that will be acceptable to human occupants and are intended to avoid adverse health effects. The standard 62-2001 recommends fresh air intake of 15 to 20 cfm per person.

Increased Ventilation Standard vs. Energy Management -  The Challenge !

Increased ventilation in a conditioned space results in much higher latent and sensible loads  imposed on the air conditioning system.

Use of Energy Recovery Equipment

Thus, it is amply clear that the air-conditioning system needs to be augmented with equipment that not only is able to elevate the ventilation levels but also is able to manage the energy consumption in a judicious way to keep the running and operating costs lowest.

DRI Fresh Air Treatment Systems like the Energy Recovery Ventilators, Treated Fresh Air Unit and Heat Recovery Wheels.

DRI “Green” Products help to maintain Indoor Air Quality (IAQ) requirements and recover energy from exhaust air, resulting in considerable reduction in installed tonnage and utility bills. They also assist in enhancing Indoor Air Quality (IAQ), maintaining desired temperature and humidity and increasing productivity. They help to earn substantial Green Building LEED Points for :

  • Energy Saving
  • Improved IEQ
  • Innovative New Technology

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