ASHRAE Journal - February 2010 - 37

Percentage Time Over Threshold 2.0% 1.8% 1.6% 1.4% 1.2% 1.0% 0.8% 0.6% 0.4% 0.2% 0.0% 500,000 1 Million 2 Million 3 Million 4 Million 5 Million 6 Million 8 Million Small Particle Level Threshold (pcf) Figure 6: Percentage of time that small particle levels exceed threshold (1.5 million lab hours). Percentage Time Over Threshold 5.0% 4.5% 4.0% 3.5% 3.0% 2.5% 2.0% 1.5% 1.0% 0.5% 0.0% 500,000 1 Million 2 Million 3 Million 4 Million 5 Million 6 Million 8 Million Small Particle Level Threshold (pcf) Figure 7: Small particles graph for multiple lab sites (1.5 million operating hours). an evolution of smoke or an aerosol into the lab room. Figure 6 shows a graph of the average level of 0.3 to 2.5 micron particles that exceeds a background level of the lab room’s supply air. Typically, about 1 million pcf is used as the threshold for increasing the minimum air change rate. As can be seen in Figure 6, the average lab room is above the 1 million pcf threshold about 0.4% of the time or about 30 minutes a week on average. If this amount of time is added to the average amount of time that TVOCs are above the control threshold, this comes to a total of about 1.0% of the time. Thus, the labs can be operated at the lowest minimum flow, on average, about 99% of the time taking into account both TVOC and particles. To provide more detail on the variation in particle data across sites, Figure 7 shows the same data but with the individual sites represented by separate lines. The average value across all sites is shown as the black dotted line for reference. This data shows a similar level of variation compared to the TVOC data. Both sets of data show about a 3-to-1 variation between the average site and the worst case site measured. Based on this data, even if the worst-case site for particles and TVOCs were the same site, this site would still operate at the lowest minimum ach rate about 96.5% of the time. The average lab room’s minimum ach rate would then need to be increased for almost six hours a week to help maintain safe lab conditions. Note that individual room data can show even greater variations resulting in rooms with higher February 2010 www.info.hotims.com/27538-40 ASHRAE Journal

ASHRAE Journal - February 2010

Table of Contents for the Digital Edition of ASHRAE Journal - February 2010

ASHRAE Journal - February 2010
Contents
Commentary
Industry News
Letters
Meetings and Shows
Heat Recovery In Retail Refrigeration
Using CO2 in Supermarkets
Demand-Based Control Of Lab Air Change Rates
Anniversary Feature: Improved Zoning Betters Department Store Air Conditioning
History of Radiant Heating & Cooling Systems, Part 2
Save Chiller Plant Energy With Guideline 22-2008
Building Sciences
ACREX 2010 Show Guide
Washington Report
InfoCenter
People
Technical Topics
Emerging Technologies
Special Products
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - February 2010 - ASHRAE Journal - February 2010
ASHRAE Journal - February 2010 - Cover2
ASHRAE Journal - February 2010 - 1
ASHRAE Journal - February 2010 - 2
ASHRAE Journal - February 2010 - Contents
ASHRAE Journal - February 2010 - 4
ASHRAE Journal - February 2010 - Commentary
ASHRAE Journal - February 2010 - Industry News
ASHRAE Journal - February 2010 - 7
ASHRAE Journal - February 2010 - 8
ASHRAE Journal - February 2010 - 9
ASHRAE Journal - February 2010 - Letters
ASHRAE Journal - February 2010 - 11
ASHRAE Journal - February 2010 - Meetings and Shows
ASHRAE Journal - February 2010 - 13
ASHRAE Journal - February 2010 - Heat Recovery In Retail Refrigeration
ASHRAE Journal - February 2010 - 15
ASHRAE Journal - February 2010 - 16
ASHRAE Journal - February 2010 - 17
ASHRAE Journal - February 2010 - 18
ASHRAE Journal - February 2010 - 19
ASHRAE Journal - February 2010 - 20
ASHRAE Journal - February 2010 - 21
ASHRAE Journal - February 2010 - 22
ASHRAE Journal - February 2010 - 23
ASHRAE Journal - February 2010 - Using CO2 in Supermarkets
ASHRAE Journal - February 2010 - 25
ASHRAE Journal - February 2010 - 26
ASHRAE Journal - February 2010 - 27
ASHRAE Journal - February 2010 - 28
ASHRAE Journal - February 2010 - 29
ASHRAE Journal - February 2010 - Demand-Based Control Of Lab Air Change Rates
ASHRAE Journal - February 2010 - 31
ASHRAE Journal - February 2010 - 32
ASHRAE Journal - February 2010 - Insert1
ASHRAE Journal - February 2010 - Insert2
ASHRAE Journal - February 2010 - 33
ASHRAE Journal - February 2010 - 34
ASHRAE Journal - February 2010 - 35
ASHRAE Journal - February 2010 - 36
ASHRAE Journal - February 2010 - 37
ASHRAE Journal - February 2010 - 38
ASHRAE Journal - February 2010 - 39
ASHRAE Journal - February 2010 - 40
ASHRAE Journal - February 2010 - 41
ASHRAE Journal - February 2010 - Anniversary Feature: Improved Zoning Betters Department Store Air Conditioning
ASHRAE Journal - February 2010 - 43
ASHRAE Journal - February 2010 - 44
ASHRAE Journal - February 2010 - 45
ASHRAE Journal - February 2010 - 46
ASHRAE Journal - February 2010 - 47
ASHRAE Journal - February 2010 - 48
ASHRAE Journal - February 2010 - 49
ASHRAE Journal - February 2010 - History of Radiant Heating & Cooling Systems, Part 2
ASHRAE Journal - February 2010 - 51
ASHRAE Journal - February 2010 - 52
ASHRAE Journal - February 2010 - 53
ASHRAE Journal - February 2010 - 54
ASHRAE Journal - February 2010 - 55
ASHRAE Journal - February 2010 - Save Chiller Plant Energy With Guideline 22-2008
ASHRAE Journal - February 2010 - 57
ASHRAE Journal - February 2010 - 58
ASHRAE Journal - February 2010 - 59
ASHRAE Journal - February 2010 - Building Sciences
ASHRAE Journal - February 2010 - 61
ASHRAE Journal - February 2010 - 62
ASHRAE Journal - February 2010 - 63
ASHRAE Journal - February 2010 - 64
ASHRAE Journal - February 2010 - ACREX 2010 Show Guide
ASHRAE Journal - February 2010 - S2
ASHRAE Journal - February 2010 - S3
ASHRAE Journal - February 2010 - S4
ASHRAE Journal - February 2010 - S5
ASHRAE Journal - February 2010 - S6
ASHRAE Journal - February 2010 - S7
ASHRAE Journal - February 2010 - S8
ASHRAE Journal - February 2010 - S9
ASHRAE Journal - February 2010 - S10
ASHRAE Journal - February 2010 - S11
ASHRAE Journal - February 2010 - S12
ASHRAE Journal - February 2010 - S13
ASHRAE Journal - February 2010 - S14
ASHRAE Journal - February 2010 - S15
ASHRAE Journal - February 2010 - S16
ASHRAE Journal - February 2010 - S17
ASHRAE Journal - February 2010 - S18
ASHRAE Journal - February 2010 - S19
ASHRAE Journal - February 2010 - S20
ASHRAE Journal - February 2010 - S21
ASHRAE Journal - February 2010 - S22
ASHRAE Journal - February 2010 - S23
ASHRAE Journal - February 2010 - S24
ASHRAE Journal - February 2010 - S25
ASHRAE Journal - February 2010 - S26
ASHRAE Journal - February 2010 - S27
ASHRAE Journal - February 2010 - S28
ASHRAE Journal - February 2010 - S29
ASHRAE Journal - February 2010 - S30
ASHRAE Journal - February 2010 - S31
ASHRAE Journal - February 2010 - S32
ASHRAE Journal - February 2010 - Washington Report
ASHRAE Journal - February 2010 - InfoCenter
ASHRAE Journal - February 2010 - 67
ASHRAE Journal - February 2010 - 68
ASHRAE Journal - February 2010 - 69
ASHRAE Journal - February 2010 - 70
ASHRAE Journal - February 2010 - 71
ASHRAE Journal - February 2010 - 72
ASHRAE Journal - February 2010 - People
ASHRAE Journal - February 2010 - Technical Topics
ASHRAE Journal - February 2010 - 75
ASHRAE Journal - February 2010 - 76
ASHRAE Journal - February 2010 - 77
ASHRAE Journal - February 2010 - Emerging Technologies
ASHRAE Journal - February 2010 - 79
ASHRAE Journal - February 2010 - 80
ASHRAE Journal - February 2010 - 81
ASHRAE Journal - February 2010 - 82
ASHRAE Journal - February 2010 - Special Products
ASHRAE Journal - February 2010 - Products
ASHRAE Journal - February 2010 - Classified Advertising
ASHRAE Journal - February 2010 - 86
ASHRAE Journal - February 2010 - 87
ASHRAE Journal - February 2010 - Advertisers Index
ASHRAE Journal - February 2010 - Cover3
ASHRAE Journal - February 2010 - Cover4
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