Air exchange effectiveness in office buildings: Measurement techniques and results

Conference · Wed Jul 01 00:00:00 EDT 1992

OSTI ID:6776828

Fisk, W J; Faulkner, D

We define two air exchange effectiveness parameters which indicate the extent of short circuiting, mixing, or displacement air flow in an entire building, the air diffusion effectiveness which indicates the air flow pattern locally, and the normalized local age of air. After describing two tracer gas procedures for measuring these parameters, we discuss assumptions inherent in the data analysis that are often violated in large office buildings. To obtain valuable data, careful selection of buildings for measurements and assessments to determine if operating conditions are reasonably consistent with the assumptions are necessary. Multiple factors, in addition to the air flow pattern in the occupied space, can affect measurement results, consequently, the interpretation of measurements is not straightforward. We summarize the results of measurements in several office buildings and in a research laboratory. Almost all measurements indicate that the extent of both short circuiting and displacement flow is small. A moderate amount of short circuiting is evident from a few measurements in rooms with heated supply air. Ages of air and their reciprocals (local ventilation rates) often vary substantially between rooms, probably because of room-to-room variation in the rate of air supply. For future research, we suggest assessments of measurement accuracy, development of measurement approaches that may be practically applied for a broader range of buildings, and a greater focus on pollutant removal efficiencies.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6776828
• Report Number(s): LBL-33103; CONF-9207170-1; ON: DE93004719
• Resource Relation: Conference: International symposium on room air convection and ventilation effectiveness, Tokyo (Japan), 22-24 Jul 1992
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
OFFICE BUILDINGS
VENTILATION
AIR FLOW
AIR QUALITY
GASEOUS DIFFUSION
INDOOR AIR POLLUTION
TRACER TECHNIQUES
AIR POLLUTION
BUILDINGS
DIFFUSION
ENVIRONMENTAL QUALITY
FLUID FLOW
GAS FLOW
ISOTOPE APPLICATIONS
POLLUTION
320107* - Energy Conservation
Consumption
& Utilization- Building Systems- (1987-)
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)