[7] INDOOR AIR QUALITY                  

ARGON SYSTEM PERMITS SIGNIFICANT REDUCTION IN OUTSIDE AIR REQUIREMENTS

The following excerpt summarizes a study supporting substantial reduction in first cost and operating costs for desk-mounted personalized air conditioning systems.  The study essentially replicated the Argon Personal Air Control System. 

Proceedings of Indoor Air 2002
Monterey, CA July 2002

VENTILATION EFFICIENCIES OF A DESK-EDGE-MOUNTED TASK VENTILATION SYSTEM

D Faulkner, WJ Fisk, DP Sullivan, SM Lee
Indoor Environment Dept., Lawrence Berkeley National Lab, Berkeley, CA

ABSTRACT

In chamber experiments, we investigated the effectiveness of a task ventilation system with an air supply nozzle located underneath the front edge of a desk and directing air toward a heated mannequin seated at the desk.  The task ventilation system provided outside air, while another ventilation system provided additional space cooling but no outside air.  Test variables included the vertical angle of air supply (-15° to 45° from horizontal), and the supply flow rate of (3.5 to 6.5 L s^-1 [7.4 to 13.8 CFM]).  Using the tracer gas step-up and step-down procedures, the measured air change effectiveness (i.e., exhaust air age divided by age of air at the mannequin’s face) ranged from 1.4 to 2.7, which is higher than typically reported for commercially available task ventilation or displacement ventilation systems.

Study supported by:
U.S. Department of Energy (DOE), Contract No. DE-AC03-76SF00098

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DEMAND CONTROL VENTILATION USING CO₂
Schell, M., Int-Hout, D., ASHRAE Journal, February 2001

ABSTRACT

Carbon dioxide (CO₂)-based demand controlled ventilation (DCV) is increasingly used to modilate outside air ventilation based on real-time occupancy.  Its use could potentially become as common as thermostatic control is today.  This article summarizes the current state of the art in (CO₂)-based ventilation control including a brief discussion of the technology used, its reliability and how it is best applied.  Like any control approach, the success of a (CO₂)-based DCV application is dependent on how it is engineered and installed.

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^[1] Oguro, M. "Evaluation of a Floor-Based A/C System Performance in an Office Building," Pan-Pacific Symposium on Building and Environmental Conditioning, Japan, March 1995.

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