Description

Two types of models for indoor air quality that are currently utilised are macroscopic models, which use a two- or three-dimensional fluid mechanics code to describe air flow and pollutant distribution in a ventilated room, and macroscopic models, which describe pollutant transport through a multiple-zone ventilation system. A macroscopic pollutant transport model is employed to simulate several methods aimed at control of indoor pollutants. An office zone and a meeting room zone, including the transient air flows and heating and cooling loads, together with the HVAC system, were modelled. Comparisons were then made between several strategies for outside air flow rate to determine their ability to control indoor pollutant levels and their impact on heating and cooling energy use. The results of this study indicate that an automatic outside air flow control strategy based on CO2 concentration can control pollutants as well as the strategy of a fixed flow of outside air such as that recommended in the 1989 ASHRAE standard. The potential heating and cooling energy savings for the automatic control strategies, as compared to the fixed flow rate recommended by ASHRAE, ranged from 10% for CAV systems to as much as 50% for VAV systems.

KEYWORDS: calculating, air quality, indoor, air change rate, air flow, air pollution, ventilation, rooms, zones, variable volume air conditioning, controls, offices, transient, heat load, cooling load, building services, comparing, outdoor air, air flow rate, energy consumption, automatic, carbon dioxide, content, energy conservation, continuous operation, demand controlled ventilation

Citation: Symposium, ASHRAE Trans. 1991, vol.97, part 2

Product Details

Published:

1991

File Size:

1 file , 1.4 MB

Product Code(s):

D-18336