ASHRAE Journal - March 2010 - 34

minimum required rates at a particular operating condition. In practice, these minimum rates could only be achieved by using a control approach that accurately counts people in each zone. In summary, considering actual population and actual zone primary airflow values (and in some cases, accounting for changes in zone air-distribution effectiveness), the lowest outdoor air intake airflow needed at any condition can be found. And, since design intake airflow (which should be the worst-case value in properly designed systems) always equals or exceeds the intake airflow needed at non-design conditions, it makes sense to consider resetting intake flow dynamically as zone airflow values, population and perhaps even zone airdistribution efficiency changes. Possible MZS Control Approaches Standard 62.1 recognizes this potential for part-load outdoor air intake flow reduction due to changes in population and zone airflow, so Section 6.2.7 allows optional dynamic reset control of breathing-zone outdoor airflow (Vbz), outdoor air intake flow (Vot) or both, in response to the current demand for ventilation. The standard includes variations in ventilation efficiency and variations in population (both of which impact intake airflow, as shown previously) as examples of conditions that may be used as the basis for optional dynamic reset control. Table 7 (see Page 32) lists several possible dynamic reset control approaches that could be considered for multiple-zone systems. This is not intended to be a complete or detailed list, but rather some approaches that have been or could be examined and compared. Some of these approaches comply with Standard 62.1 indirectly since they adjust outdoor air intake flow based on contaminant levels, rather than currently calculated airflow requirements. The standard requires outdoor air intake flow, determined using prescribed zone outdoor airflow rates and prescribed equations but it does not require direct control of specific contaminant (or surrogate) concentrations. One approach uses airflow-only ventilation reset control (VRC), solving the multiple-zone system equations to adjust for variations in efficiency due to changes in zone airflow while assuming design population in all zones. And, several approaches combine system-level VRC with zone-level DCV to find the current outdoor air intake flow, accounting for changes in zone airflow and zone population. Any of these approaches and their potential advantages and disadvantages can be debated. Future articles on dynamic reset in multiple-zone systems should examine some of these control approaches in more detail and compare them at specific operating conditions, to improve the accuracy of this table and demonstrate the viability of various multiple-zone system www.info.hotims.com/30302-7 ASHRAE Journal March 2010

ASHRAE Journal - March 2010

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

Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Standard 62.1-2007: Dynamic Reset for Multiple-Zone Systems
35 Years of Standard 90.1
Humidity Controls for Data Centers: Are They Necessary?
ASHRAE’s Best: 2010 Technology Awards
Technology Award Case Studies: Green Warehouse
Building Sciences
Products
Emerging Technologies
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - March 2010 - Cover1
ASHRAE Journal - March 2010 - Cover2
ASHRAE Journal - March 2010 - 1
ASHRAE Journal - March 2010 - 2
ASHRAE Journal - March 2010 - Contents
ASHRAE Journal - March 2010 - Commentary
ASHRAE Journal - March 2010 - 5
ASHRAE Journal - March 2010 - Industry News
ASHRAE Journal - March 2010 - 7
ASHRAE Journal - March 2010 - 8
ASHRAE Journal - March 2010 - MIT1
ASHRAE Journal - March 2010 - MIT2
ASHRAE Journal - March 2010 - MIT3
ASHRAE Journal - March 2010 - MIT4
ASHRAE Journal - March 2010 - MIT5
ASHRAE Journal - March 2010 - MIT6
ASHRAE Journal - March 2010 - MIT7
ASHRAE Journal - March 2010 - MIT8
ASHRAE Journal - March 2010 - 9
ASHRAE Journal - March 2010 - 10
ASHRAE Journal - March 2010 - 11
ASHRAE Journal - March 2010 - Letters
ASHRAE Journal - March 2010 - 13
ASHRAE Journal - March 2010 - 14
ASHRAE Journal - March 2010 - 15
ASHRAE Journal - March 2010 - 16
ASHRAE Journal - March 2010 - 17
ASHRAE Journal - March 2010 - 18
ASHRAE Journal - March 2010 - 19
ASHRAE Journal - March 2010 - Meetings and Shows
ASHRAE Journal - March 2010 - 21
ASHRAE Journal - March 2010 - Standard 62.1-2007: Dynamic Reset for Multiple-Zone Systems
ASHRAE Journal - March 2010 - 23
ASHRAE Journal - March 2010 - 24
ASHRAE Journal - March 2010 - 24a
ASHRAE Journal - March 2010 - 24b
ASHRAE Journal - March 2010 - 25
ASHRAE Journal - March 2010 - 26
ASHRAE Journal - March 2010 - 27
ASHRAE Journal - March 2010 - 28
ASHRAE Journal - March 2010 - 29
ASHRAE Journal - March 2010 - 30
ASHRAE Journal - March 2010 - 31
ASHRAE Journal - March 2010 - 32
ASHRAE Journal - March 2010 - 33
ASHRAE Journal - March 2010 - 34
ASHRAE Journal - March 2010 - 35
ASHRAE Journal - March 2010 - 35 Years of Standard 90.1
ASHRAE Journal - March 2010 - 37
ASHRAE Journal - March 2010 - 38
ASHRAE Journal - March 2010 - 39
ASHRAE Journal - March 2010 - 40
ASHRAE Journal - March 2010 - MITE1
ASHRAE Journal - March 2010 - MITE2
ASHRAE Journal - March 2010 - 41
ASHRAE Journal - March 2010 - 42
ASHRAE Journal - March 2010 - 43
ASHRAE Journal - March 2010 - 44
ASHRAE Journal - March 2010 - 45
ASHRAE Journal - March 2010 - 46
ASHRAE Journal - March 2010 - 47
ASHRAE Journal - March 2010 - Humidity Controls for Data Centers: Are They Necessary?
ASHRAE Journal - March 2010 - 49
ASHRAE Journal - March 2010 - 50
ASHRAE Journal - March 2010 - 51
ASHRAE Journal - March 2010 - 52
ASHRAE Journal - March 2010 - 53
ASHRAE Journal - March 2010 - 54
ASHRAE Journal - March 2010 - 55
ASHRAE Journal - March 2010 - ASHRAE’s Best: 2010 Technology Awards
ASHRAE Journal - March 2010 - 57
ASHRAE Journal - March 2010 - 58
ASHRAE Journal - March 2010 - 59
ASHRAE Journal - March 2010 - 60
ASHRAE Journal - March 2010 - 61
ASHRAE Journal - March 2010 - 62
ASHRAE Journal - March 2010 - 63
ASHRAE Journal - March 2010 - Technology Award Case Studies: Green Warehouse
ASHRAE Journal - March 2010 - 65
ASHRAE Journal - March 2010 - 66
ASHRAE Journal - March 2010 - 67
ASHRAE Journal - March 2010 - 68
ASHRAE Journal - March 2010 - 69
ASHRAE Journal - March 2010 - 70
ASHRAE Journal - March 2010 - 71
ASHRAE Journal - March 2010 - Building Sciences
ASHRAE Journal - March 2010 - 73
ASHRAE Journal - March 2010 - 74
ASHRAE Journal - March 2010 - 75
ASHRAE Journal - March 2010 - 76
ASHRAE Journal - March 2010 - 77
ASHRAE Journal - March 2010 - 78
ASHRAE Journal - March 2010 - 79
ASHRAE Journal - March 2010 - Products
ASHRAE Journal - March 2010 - 81
ASHRAE Journal - March 2010 - Emerging Technologies
ASHRAE Journal - March 2010 - 83
ASHRAE Journal - March 2010 - Special Products
ASHRAE Journal - March 2010 - Classified Advertising
ASHRAE Journal - March 2010 - 86
ASHRAE Journal - March 2010 - 87
ASHRAE Journal - March 2010 - Advertisers Index
ASHRAE Journal - March 2010 - Cover3
ASHRAE Journal - March 2010 - Cover4
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