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May 13, 2011 Page 1 of 25
AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-
CONDITIONING ENGINEERS, INC.
SSPC 55 Thermal Environmental Conditions for Human
Occupancy
MEETING MINUTES
May 13, 2011 Page 2 of 25
Contents MEETING MINUTES .................................................................................................................... 1
SATURDAY MEETING ................................................................................................................ 3
SUNDAY MEETING ..................................................................................................................... 8
Attachment 1 - ATTENDANCE ................................................................................................. 11
Attachment 2 - AGENDA ........................................................................................................... 15
Attachment 3 – ROSTER .......................................................................................................... 18
Attachment 4 – PUBLIC REVIEW DRAFT PROPOSAL ...................................................... 19
Attachment 5 – DISCUSSION MATERIAL FOR PRESCRIPTIVE PATH .......................... 21
May 13, 2011 Page 3 of 25
SATURDAY MEETING
These draft minutes must be approved by this committee to be the official approved record.
1) CALL TO ORDER
a) Introduction of Members and Guests
See attendance sheet in attachment 1.
b) Quorum Determination (16 Voting Members)
13 voting members present. Quorum.
c) Announcements
Chair announced John Stoops has volunteered as vice chair.
2) AGENDA REVIEW
See approved agenda in attachment 2.
Approval of agenda: Motion by Tom Hartman, seconded by Dan Int-Hout, motion carried
unanimously.
3) MINUTES OF THE LAST MEETING
Minutes were circulated by email, will be made available on website in the future.
Approval of minutes: Motion by Tom Hartman, seconded by Dan Int- Hout, motion carried
unanimously.
4) ROSTER CHANGES
Chair noted that Ozgem is rolling off committee due to company travel restrictions.
Two new voting members: Julian Rimmer and Abhijeet Pande.
5) PUBLICATION PUBLIC REVIEW DRAFTS
a) Adaptive model & air movement (deDear)
Presentation by Richard deDear.
Schoen stated that the committee should see the actual publications public review draft (not
the whole standard as changed) before approval. Sahar prepared while discussion ensued.
Motion to pass proposal 1, 2, & 3 by Abhijeet Pande, seconded by John Stoops, roll call vote
passed. Publication Public Review Draft Proposal is included in minutes under Attachment 4.
May 13, 2011 Page 4 of 25
NAME Interest
Category
Voting
Member
Vote Comments
Yes No No w/o
Comment
Abstain Not
Returned
Gwelen Paliaga -
Chair
User yes Not voting
Edward Arens General
Interest yes x
Richard Aynsley Producer yes x
Robert Bean General
Interest yes x
Sahar
Abbaszadeh -
Secretary
General
Interest yes x
Yanzheng Guan User yes absent
Thomas Hartman User yes x
Daniel Int-Hout Producer yes x
Essam Khalil General
Interest yes x
Brian Lynch Producer yes absent
Michael
O’Rourke
Producer yes x
Abhijeet Pande General
Interest yes x
Julian Rimmer Producer yes x
Lawrence Schoen User yes x
John Stoops General
Interest yes x
Stephen Turner User yes Absent
Continuation ballot will be sent to members not present.
Proposed follow up on expanding both studies to include humidity instead of constant 50% RH
as presented. Add to work plan for future.
Gail suggests two future roads to Adaptive model: one simple graphical and one computer
based more technical to address needs of all engineers.
Future topic: Climate based adaptive model.
b) References to climatic data (Simmonds)
Presentation by Peter Simmonds.
Proposal to add language to climate data definition and multiple references to it throughout the
standard.
May 13, 2011 Page 5 of 25
Discussion to remove the details and only include first sentence of climatic data definition.
Larry Schoen noted that you should not reference a nonstandard (ASHRAE handbook) in a
standard. “Shoulds” are not appropriate for standards. Also, be careful referencing other
standards as they change frequently.
Larry suggested reference to examples of climatic data in Informative appendix.
Working Group: Proposal to be reviewed and brought back to the committee with changes
based on discussion (Peter Simmonds, Peter, John S., Larry,…)
6) RESPONSES TO COMMENTER’S (none)
7) CONTINUOUS MAINTENANCE PROPOSALS (none)
8) MANDATORY LANGUAGE
a) Design compliance path (section 6 & calculations)
Discussion about mandatory language and code references. Chair suggested a mandatory
section for design (not evaluation or validation), that states how to calculate according to
Standard and meet comfort criteria. Comfort criteria and CLO/MET assumptions would be at
the discretion of the designer. If there are code references they can reference the mandatory
calculation procedure. LEED and 198.1 already make this distinction by referencing section 6 of
the standard.
Committee had a strong support for this pathway. Chair thinks that CIS will also support this.
This has been included in the workplan that the committee will vote on. Chair wanted to get a
sense for what direction the committee wanted to do before the visit from staff and CIS.
b) Language cleanup based on draft document from Mark Weber
c) Working group members
d) 6 month plan
Further discussion and related action plan added to working group discussion for this afternoon.
9) THREE CLASSES
a) Review of pro/con arguments for class A. (Arens, Simmonds)
Presentations by Peter Simmonds and Ed Arens on SSPC 55 – Three Classes.
Acceptability vs. PMV (ASHRAE data) shows very little difference.
Should Class A be personal control? Class B ok as is? Class C wider range for passive systems?
b) Decide how to proceed.
At this time the committee did not accept ISO 7730 3-classes; Committee supports pursuing 3
classes but NOT as previously proposed.
May 13, 2011 Page 6 of 25
Motion: It is the intent of the committee to from a working group to pursue a multi-class criteria
for Standard 55.
John made the motion. Tom seconded. Unanimously approved by all present.
►11:30 AM Visit to discuss mandatory language: 11:30 (30 min)
Mark Weber (Staff),
Carol Marriott (Vice Chair – Standards)
Steve Bruning (SPLS Liason).
Chair presented the proposed approach adopted by the committee (addressing mandatory
calculation procedures) and the visitors agree that this is a good approach. Committee will start
with Section 6.
Visitors will see if they can provide copies of Standard 183-2007 load calculations to this
committee for reference.
Once the update to the software tool 2010 is completed, the funding for the software will be
under the purview of this Standard to manage. The process for funding has to be determined, as
yet.
User’s manual proposals are more likely to get accepted, assuming that there are other avenues
for funding as well as ASHRAE (USGBC, DOE, etc).
The detailed workplan is for internal committee and the official workplan, submitted by chair,
has milestones and dates.
It has been discussed that the next publication date for 189, 90.1, 62 would be 2013, any
workplan should consider this.
Mandatory language document is a draft and any feedback would be appreciated.
10) Adjourn for Lunch (12:02).
►Comfort analysis example: Ideas for 55 (Simmonds presentation)
Presentation on computer simulation that looks at PMV/PPD. Discussion followed.
11) INTERNAL WORK PLAN
a) Working Groups
Discussion led by John Stoops. Subcommittees will use GoToMeetings. Sahar Abbaszadeh
edited Internal Work Plan document on screen to be distributed to committee later. Josh and
Robert to work together on editable online version of plan. Peter suggested we reconsider
including Thermal Comfort Tool with Standard. Abhijeet to bring motion to committee for
May 13, 2011 Page 7 of 25
Sunday meeting (1/30/11). 1383 to be added to agenda for tomorrow. Dan Int-Hout moved to
approve work plan. Michael O’Rourke Seconded. Motion passed unanimously.
b) Task list
c) Members Assigned to Working Groups
d) Working group meeting schedule TBD
e) Richard DeDear presented “Impact of RH% on Elevated Air Speed”. Showed
that use of cooling effect of Air Movement has little variation over a large range of
clo values, temperature increases, and humidity.
May 13, 2011 Page 8 of 25
SUNDAY MEETING
1) OLD BUSINESS : Abhijeet to bring motion to committee for including Thermal Comfort
Tool with Standard.
i) Software – Aynsley (members: Bean, Pande, Simmonds, Hartman)
(1) Software tool purchase option:
Background: Chair will revise as appropriate later. Historically it has been very hard to find the
software tool when purchasing the Standard online. The committee believes that too many users
are using the graphical method when not applicable. In order to advance the state of the art,
and the appropriate use of Standard 55, the committee would like to ensure that the appropriate
calculations are used. There are various ways to execute this in publications.
Motion: "The committee votes to request ASHRAE publications and standards committees to
bundle the ASHRAE Thermal Comfort Tool with the Standard 55-2010 -- Thermal Environmental
Conditions for Human Occupancy (ANSI approved) for sale through the ASHRAE bookstore"
Abhijeet Pande moved. Larry Schoen seconded. No further discussion.
NAME Interest
Category
Voting
Member
Vote Comments
Yes No No w/o
Comment
Abstain Not
Returned
Gwelen Paliaga -
Chair
User yes x
Edward Arens General
Interest yes x
Richard Aynsley Producer yes x
Robert Bean General
Interest yes x
Sahar
Abbaszadeh -
Secretary
General
Interest yes x
Yanzheng Guan User yes absent
Thomas Hartman User yes x
Daniel Int-Hout Producer yes x
Essam Khalil General
Interest yes absent
Brian Lynch Producer yes x
Michael
O’Rourke
Producer yes x
Abhijeet Pande General
Interest yes x
Julian Rimmer Producer yes absent
May 13, 2011 Page 9 of 25
Lawrence Schoen User yes x
John Stoops General
Interest yes x
Stephen Turner User yes absent
b) Update on comfort tool. Software – Aynsley (members: Bean, Pande,
Simmonds, Hartman)
(a) New Differences: Number of options to choose from, tailored to design.
(b) Needs straightforward way to incorporate 6 variables for SET method.
(c) TC 2.1 needs to close the project.
c) Proposed errata Nomenclature for mean radiant averages (Bean). Moved by John
Stoops. Seconded by Tom Hartman. Passed unanimously.
►Chinese Thermal Comfort Standard Presentation – (Baizhan Li)
Adaptive PMV. acceptable if PMV within -1 and +1. Comfort PMV within 0.7 and -0.7.
Laboratory test of 500 subjects: between 13 and 29 people adapt, above that more
health symptoms.
►Prescriptive vs. Performance compliance presentation – (Schoen)
d) Refer to Attachment 5 for document used in discussion. Many of the numbers in the
document are place holders. Gwelen noted that, to his knowledge and the other SSPC
chairs’, current ASHRAE standards don’t define thermal zoning (i.e. for load
calculations). There are several points of discrepancy between Standard 55 and 62.1
(such as zoning) that we may want to coordinate with them.
Unanimous consent that this a direction Standard 55 should go. Work Plan list
committee members and prospective members.
e) Molly McGuire, chair of energy working group for 189.1 – would like building projects
to take credit for saving energy by using novel ways to look at thermal comfort.
Gwelen: there is a need to look at hour by hour energy simulation against hour by hour
comfort simulations, so trade offs can be made and so we can verify the efficiency
measures do not compromise comfort. Chandra: suggested 189 might look at exceeding
Standard 55, like it does for 90.1 and 62.1. Task group to be added for scoping. Larry
wanted 189 to be conscious that tighter temperature and humidity controls aren’t the
recommended way to go. Individual control would be the suggestion. Standard 189 has
need for thermal comfort measures that apply to all buildings.
f) Smart phone application (Schiavon) – Droid market is bigger, code is open, no
fee to write software. Debate over whether people would really use a mobile
May 13, 2011 Page 10 of 25
application. Debate over Droid, iPhone, or web based platform. Debate over
whether this is a priority. Abhijeet Pande to look at this as part of his working
group.
g) Standard 62.1 Update: (Larry). One interpretation regarding air distribution to multiple
spaces. Potential addendum for monitoring OA conditions. Potential addendum for
creating a lower limit for rh%.
h) 90.1 Update: ECB looking at addenda for taking energy credit for changing setpoints as
long as comfort is maintained per std. 55 (Josh Eddy to monitor).
i) 189.1 Update – allows broadest interpretation of Standard 55.
j) TC 4.1 is worth corresponding with. We need a volunteer.
2) Adjourn
May 13, 2011 Page 11 of 25
Attachment 1 - ATTENDANCE
ASHRAE SSPC 55 Attendance Sheet
Date: 1-29-11
NAME
Voting
Memb
er
Email Address Primary Phone
number
Presen
t?
Contact
Informati
on
Update (if
any)
Committee Members
Gwelen Paliaga -
Chair yes
m (+1)510-263-1546 XX
Edward Arens yes
(+1)510-643-5571 XX
Richard Aynsley yes
[email protected] +61754710649 XX
YES
Robert Bean yes
(+1)403-278-8481 XX
Sahar
Abbaszadeh -
Secretary yes
(+1)510-444-5140 XX
Yanzheng Guan yes
(+1)212-593-0486 NN
Thomas Hartman yes
(+1)254-793-0120 XX
Daniel Int-Hout yes
(+1)972-497-0418 XX
Essam Khalil yes
20233366677 XN
Brian Lynch
yes
bl@westernmechanicalsolutio
ns.com (+1)720-488-2905 NX
Michael
O’Rourke yes [email protected]
(+1)303-325-5244 XX
Abhijeet Pande yes
(+1)916-962-7001 XX
Julian Rimmer yes
(+1)770-363-9389 XN
Lawrence Schoen yes
(+1)410-730-9797 XX
John Stoops yes
(+1)510-891-0446 XX
Stephen Turner yes
(+1)401-524-4798 NN
Peter Simmonds no
(+1)818-377-8220 XX
ASHRAE Staff
May 13, 2011 Page 12 of 25
Mark Weber no
(+1)404-636-8400 NN
SPLS Liason
Steven F Bruning
no
sbruning@newcomb-
boyd.com (+1)404-730-8400 NN
Visitors
Zhang Hui
[email protected] (+1)510-642-6918 X
Stefano Schiavon
N
Baizhan Li [email protected] (+86)13-
883345420 (?) X
Hong Liu [email protected] (+86)23-65127531 X
Peter Alspach [email protected]
(+1)206-493-2226 X
Gail Brager
Richard deDear
u X
Dan Sullivan [email protected]
(+1)952-428-9646 X
Josh Eddy [email protected]
(+1)714-969-8909 X
Andreas Holm [email protected] X
Bjarne Olesen Bwogbyg.dtu.dk X
John Gierzak [email protected] X
X
Date: 1-30-11
NAME
Voting
Memb
er
Email Address Primary Phone
number
Presen
t?
Contact
Informati
on
Update (if
any)
Committee Members
Gwelen Paliaga -
Chair yes
m (+1)510-263-1546 X
Edward Arens yes
(+1)510-643-5571 X
May 13, 2011 Page 13 of 25
Richard Aynsley yes
[email protected] +61754710649 X
YES
Robert Bean yes
(+1)403-278-8481 X
Sahar
Abbaszadeh -
Secretary yes
(+1)510-444-5140 X
Yanzheng Guan yes
(+1)212-593-0486 N
Thomas Hartman yes
(+1)254-793-0120 X
Daniel Int-Hout yes
(+1)972-497-0418 X
Essam Khalil yes
(+1)202-33366677 N
Brian Lynch
yes
bl@westernmechanicalsolutio
ns.com (+1)720-488-2905 X
Michael
O’Rourke yes [email protected]
(+1)303-325-5244 X
Abhijeet Pande yes
(+1)916-962-7001 X
Julian Rimmer yes
(+1)770-363-9389 X
Lawrence Schoen yes
(+1)410-730-9797 X
John Stoops yes
(+1)510-891-0446 X
Stephen Turner yes
(+1)401-524-4798 N
Peter Simmonds no
(+1)818-377-8220 N
ASHRAE Staff
Mark Weber no
(+1)404-636-8400 N
SPLS Liason
Steven F Bruning
no
sbruning@newcomb-
boyd.com (+1)404-730-8400 N
Visitors
Zhang Hui
[email protected] (+1)510-642-6918 X
Stefano Schiavon
(+1)510 8035163 X
Baizhan Li [email protected] (+86)13-
883345420 (?) X
Yuguo Li [email protected] (+86)23-65127531 X
Mark Seymour
Mark.seymour@futurefacilities
.com
X
May 13, 2011 Page 14 of 25
Gail Brager
Richard deDear
u X
Madhavi Indraganti
X
Josh Eddy [email protected]
(+1)714-969-8909 X
Jaap Hoqeling [email protected] X
Chandra Sekhar
1.1. Membership application deadline
1.1.1. April 22, 2011
May 13, 2011 Page 15 of 25
Attachment 2 - AGENDA
Saturday 8:00am-3:00pm (LVCC) N231
1) CALL TO ORDER
a) Introduction of Members and Guests
b) Quorum Determination (18 Voting Members)
c) Announcements
2) AGENDA REVIEW
3) MINUTES OF THE LAST MEETING
4) ROSTER CHANGES
5) PUBLICATION PUBLIC REVIEW DRAFTS
a) Adaptive model & air movement (deDear)
b) References to climatic data (Simmonds)
6) RESPONSES TO COMMENTER’S (none)
7) CONTINUOUS MAINTENANCE PROPOSALS (none)
8) MANDATORY LANGUAGE
a) Design compliance path (section 6 & calculations)
b) Language cleanup based on draft document from Mark Weber
c) Working group members
d) 6 month plan
9) THREE CLASSES 10:30 (60 min)
a) Review of pro/con arguments for class A. (Arens, Simmonds)
b) Decide how to proceed.
►11:30 AM Visit to discuss mandatory language: 11:30 (30 min)
Mark Weber (Staff),
Carol Marriott (Vice Chair – Standards)
Steve Bruning (SPLS Liason).
10) Lunch
►Comfort analysis example: Ideas for 55 (Simmonds presentation)
11) INTERNAL WORK PLAN
a) Working Groups
b) Task list
May 13, 2011 Page 16 of 25
c) Assign members to Working Groups
d) Working group meeting schedule
e) Interim meeting date:
i) propose April 21, 9:00AM – 12:00 Pacific time
(12:00-3:00pm Eastern Time, 7:00pm-10:00pm Cairo)
Sunday 9:00am-12pm (LVCC) N240
12) OLD BUSINESS
a) WORKING GROUP REPORTS
i) Software – Aynsley (members: Bean, Pande, Simmonds, Hartman)
(1) Update on comfort tool
b) TASK GROUP REPORTS
i) Handbook update to align with standard (Simmonds, Hartman)
ii) Worked examples of PMV/PPD compliance for appendix (Bean, Hartman,
Simmonds)
c) LIAISON REPORTS
i) CIS
ii) TC 2.1 (Stoops)
iii) SSPC 62.1 (Shoen?)
iv) SSPC 90.1 (need volunteer)
v) SSPC 189 (need volunteer)
(1) 189 WG-10 “Energy Use Efficiency” request to develop guidance for
energy/comfort simulations.
vi) RP-1683 (Simmonds)
vii) TC 5.3 (Rimmer?)
viii) USGBC EQ TAG (Abbasadeh)
ix) Forum 7 program: method of test for ceiling fans (Aynsley, Josh Eddy)
x) Others
d) INTERPRETATION REQUEST & ERRATA
i) FORMAL REQUESTS
(1) Non-thermal factors in scope
May 13, 2011 Page 17 of 25
ii) INFORMAL REQUESTS (chairs report)
iii) Issued 2 errata that are posted on ASHRAE web site
iv) Proposed errata Nomenclature for mean radiant averages (Bean)
►Chinese Thermal Comfort Standard Presentation – (Baizhan Li)
►Prescriptive vs. Performance compliance presentation – (Schoen)
13) NEW BUSINESS
a) Software - Smart phone application (Schiavon)
b) RP-1469 Research project update (Stoops)
c) Future conference programs (through 55 or TC 2.1?)
i) Using Air Movement for Low Energy Comfort: The need for a method of test
for circulatory fans.
ii) Standard 55-2010
iii) Compliance with 55-2010 & LEED
14) CLEANUP
a) Work plan
b) Mandatory language
c) New ideas
15) NEXT MEETING: Interim meeting in April (date TBD), Annual conference
16) Adjourn
May 13, 2011 Page 18 of 25
Attachment 3 – ROSTER
Date updated: 1-25-2011
NAME Interest
Category
Voting
Member
Vote Comments
Yes No No w/o
Comment
Abstain Not
Returned
Gwelen Paliaga -
Chair
User yes
Edward Arens General
Interest yes
Richard Aynsley Producer yes
Robert Bean General
Interest yes
Sahar
Abbaszadeh -
Secretary
General
Interest yes
Yanzheng Guan User yes
Thomas Hartman User yes
Daniel Int-Hout Producer yes
Essam Khalil General
Interest yes
Brian Lynch Producer yes
Michael
O’Rourke
Producer yes
Abhijeet Pande General
Interest yes
Julian Rimmer Producer yes
Lawrence Schoen User yes
John Stoops General
Interest yes
Stephen Turner User yes
May 13, 2011 Page 19 of 25
Attachment 4 – PUBLIC REVIEW DRAFT PROPOSAL
Elevated Air Speed for Adaptive Comfort Model
Section 5.2.3.3.2 after paragraph starting with “For operative temperatures between 22.5°C and
25.5°C (72.5°F and 77.9°F), …” and pursuing equations insert new text in red:
The curves in Figure 5.2.3.2. shift towards the left or right as the clo or met level changes.
An increase of 0.1 clo or 0.1 met corresponds to 0.8ºC (1.4ºF) or 0.5ºC (0. 9ºF) operative
temperature reduction; an decrease of 0.1 clo or 0.1 met corresponds to 0.8ºC (1.4ºF) or
0.5ºC (0. 9ºF) operative temperature increase.
Section 5.3 after “No humidity or air-speed limits are required when this option is used.” Insert
new text and table in red:
Section 5.3 after paragraph “For spaces that meet these criteria”, insert new text in red:
The equations corresponding to the acceptable operative temperature ranges in Figure
5.3 are:
Upper 80% acceptability limit (°C) = 0.31 (mean outdoor monthly air temperature) +
21.3
Upper 80% acceptability limit (°F) = 0.31 (mean outdoor monthly air temperature) +
60.5
May 13, 2011 Page 20 of 25
Upper 90% acceptability limit (°C) = 0.31 (mean outdoor monthly air temperature) +
20.3
Upper 90% acceptability limit (°F) = 0.31 (mean outdoor monthly air temperature) +
58.7
Lower 80% acceptability limit (°C) = 0.31 (mean outdoor monthly air temperature) +
14.3
Lower 80% acceptability limit (°F) = 0.31 (mean outdoor monthly air temperature) + 47.9
Lower 90% acceptability limit (°C) = 0.31 (mean outdoor monthly air temperature) +
15.3
Lower 90% acceptability limit (°F) = 0.31 (mean outdoor monthly air temperature) + 49.7
May 13, 2011 Page 21 of 25
Attachment 5 – DISCUSSION MATERIAL FOR PRESCRIPTIVE PATH
BACKGROUND
Selected definitions from 62.1-2010 for information only
acceptable indoor air quality: air in which there are no known contaminants at harmful
concentrations as determined by cognizant authorities and with which a substantial majority (80%
or more) of the people exposed do not express dissatisfaction.
air conditioning: the process of treating air to meet the requirements of a conditioned space by
controlling its temperature, humidity, cleanliness, and distribution.
breathing zone: the region within an occupied space between planes 3 and 72 in. (75 and 1800
mm) above the floor and more than 2 ft (600 mm) from the walls or fixed air-conditioning
equipment.
occupiable space: an enclosed space intended for human activities, excluding those spaces that
are intended primarily for other purposes, such as storage rooms and equipment rooms, and that
are only occupied occasionally and for short periods of time.
ventilation zone: any indoor area that requires ventilation and consists of one or more occupiable
spaces with similar occupancy category (see Table 6-1), occupant density, zone air distribution
effectiveness (see Section 6.2.2.2), and zone primary airflow (see Section 6.2.5.1) per unit area.
Note: A ventilation zone is not necessarily an independent thermal control zone; however,
spaces that can be combined for load calculation purposes can often be combined into a
single zone for ventilation calculations purposes.
Selected definitions from 55-2010
comfort, thermal: that condition of mind that expresses satisfaction with the thermal
environment and is assessed by subjective evaluation.
environment, thermal: the characteristics of the environment that affect a person's heat loss.
environment, acceptable thermal: an environment that a substantial majority of the occupants
would find thermally acceptable.
naturally conditioned spaces, occupant controlled: those spaces where the thermal conditions
of the space are regulated primarily by the opening and closing of windows by the occupants.
zone, occupied: the region normally occupied by people within a space, generally considered to
be between the floor and 1.8 m (6 ft) above the floor and more than 1.0 m (3.3 ft) from outside
walls/windows or fixed heating, ventilating, or air-conditioning equipment and 0.3 m (1 ft) from
internal walls.
May 13, 2011 Page 22 of 25
Note to authors: 62.1 and 55 use the terms zone and space differently and we might want to
conform these more closely for the benefit of users of the Standards.
We also might consider defining default occupied spaces. For instance, vestibules, corridors,
pass-thru atria and similar spaces wouldn’t normally be occupied and might be excluded entirely.
Then we might make occupied zones more mandatory than “generally considered” above, while
allowing specific exceptions for designs that have custom occupied zones. For instance,
particular designs that anticipate no human occupancy in certain areas, for instance right next to
a radiant heat output, near a heavily glazed area, near a floor, sidewall or overhead air supply.
Other comparisons between 62.1 and 55: 62.1 has a Section (4) on Outdoor air and certain Documentation requirements. We might consider a similar section on Climatic Conditions 62.1 has a Section (5) on Systems and Equipment and certain Documentation requirements. We might consider such a section that covers items such as Air Balance, Controls – thermostats, surface temperature (warmup / cooldown), Envelopes and Other hot and cold surfaces. CURRENT LANGUAGE IN 55 (Performance based) Building systems (i.e., combinations of mechanical systems, control systems, and thermal envelopes) shall be designed so that at design conditions they are able to maintain the space at conditions within the range specified by one of the methods in this standard. This standard does not include specific guidance regarding mechanical systems, control systems, or the thermal envelopes for spaces as part of its scope. In addition, the mechanical systems, control systems, and thermal envelopes shall be designed so that they are able to maintain the space at conditions within the range specified in this standard at all combinations of conditions that are expected to occur, with the exception of extreme conditions. The expected conditions shall include variations in both internal loads and the external environment. The system shall have controls that enable it to meet comfort requirements at less than full system capacity. PROPOSED LANGUAGE FOR A PRESCRIPTIVE PATH PROCEDURES (note to authors: this outlines that any choice of compliance paths meets
the Std.)
General. The Standard Analytical Procedure (5.2), the Natural Conditioning Procedure (5.3),
and/or the Prescriptive Procedure (5.4 – TBD) shall be used to meet the requirements of this
section. In addition, the general requirements for _______ shall be met regardless of the method
used to determine thermal comfort.
Note: Although building and system parameters determined using each of these approaches
may differ significantly because of assumptions about the design, any of these approaches is a
valid basis for design.
May 13, 2011 Page 23 of 25
Standard Analytical Procedure. This performance-based design procedure (presented in
Section 5.2), in which the building and system design parameters are based on an analysis of
thermal conditions, occupant activities, attire, and level of thermal comfort acceptability, shall be
permitted to be used for any thermal comfort zone.
Natural Conditioning Procedure. The design procedure presented in Section 5.3, in which
conditioning air is provided through openings to the outdoors, shall be permitted to be used for
any thermal comfort zone that consists entirely of naturally conditioned spaces.
Prescriptive Procedure. The prescriptive design procedure presented in Section 5.4, in which
building and system design are determined based on space type, application and expected
occupant activities (met) and attire (clo), shall be permitted to be used for any zone or system that
meets the minimum requirements.
Note: The Prescriptive Procedure requirements are based on building, system and occupant
attributes that are typical for the listed occupancy categories.
5.4 Prescriptive Procedure.
Definitions, probably best included in section 3, but shown here for author review
purposes.
thermal comfort zone: any indoor area that requires thermal conditioning and consists of one or
more occupied zones (note to authors: 62.1 calls these occupiable spaces) with similar occupancy
category (see Table ____) and thermal conditions.
Note: A thermal comfort zone generally has independent thermal control.
Requirements (note to authors: you may decide that some of these are general requirements
that apply to all of the 3 Procedures.
1. All load calculations required in this section shall be in accordance with ASHRAE Standard
183-2007.
2. All occupied zones of the building shall be identified. Spaces not normally occupied, such as
storage, electric rooms, vestibules and parking areas may be excluded from thermal design
requirements for human occupancy.
3. The occupied zones of the building shall be divided into thermal comfort zones.
4. Each room (a space enclosed by exterior or interior walls) shall be considered a separate
thermal comfort zone. Exception: Rooms may be combined into a single thermal comfort
zone, provided that all of the following conditions are met:
4.1. The envelope meets or exceeds the requirements in ASHRAE Standard 90.1-2010.
4.2. Rooms are within 450 of the same compass direction. Exception: glazed area does not
exceed 2% of the total façade area.
May 13, 2011 Page 24 of 25
4.3. Interior thermal loads and their expected use profiles over time for each room are within
25% of each other
5. Each thermal comfort zone designed using the Prescriptive Procedure shall meet the
minimum requirements given in Table X.
6. Air conditioning and heating load calculations for each thermal comfort zone shall be
prepared and included in the turnover documents.
6.1. Heating climatic design conditions shall be ____ (include dry bulb and wind).
6.2. Heating interior space dry bulb temperature shall be in accordance with Table X.
6.3. Cooling climatic design conditions shall be ____ (include dry bulb, humidity, wind and
solar)
6.4. Cooling interior space dry bulb and humidity design conditions shall be in accordance
with Table X.
6.5. Peak cooling calculations shall be performed at the design dry bulb, design dew point
and the “humidity challenge condition” described in Standard 62.1.
7. For zones designed with or intended to be operated with heating setback and cooling setup
more than 50F different from the values shown in Table X, the calculations shall include one
of the following:
7.1. Dynamic system startup calculations
7.2. The up-sizing factor above the steady state calculations shall be of 20% for heating and
10% for cooling. (Note to authors: This requirement may be unnecessary - I don’t know
how detailed Std 183 is.)
8. HVAC systems shall be designed so that the system capacity for each thermal zone is at least
90% of the capacity determined by the load calculations and each has its own thermostatic
control
9. Air diffusion design shall be performed in accordance with ____ and terminal velocity at
____ shall be in accordance with the minimum requirements in Table X.
10. HVAC system capacity shall be not less than 90% of system requirements determined by one
of the following methods:
10.1. The arithmetic sum of the thermal zones served by each system, plus distribution losses.
10.2. The block load of the thermal zones served by each system, plus distribution losses.
10.3. The system load taking into account load diversity plus distribution losses.
11. HVAC system design shall be capable of meeting the dynamic loads of each space. Note: this
often precludes the use of 2 pipe hydronic systems and makes airside or waterside
economizers necessary.
TABLE X – Design Temperatures and Minimum Requirements for Prescriptive Procedure
Design Temperatures 0F Minimum Requirements
Occupancy
category
Heating
dry bulb
Cooling
dry bulb
Cooling
wet bulb
Zone
glazing1
Radiant
heat
Equipment
loads
Terminal
velocity
Office nn-nn
(range)
nn-nn
(range)
nn-nn
(range)
10% or
less
Not
permitted.
5 W/ft2 or
less
__ fpm
or less
May 13, 2011 Page 25 of 25
1If occupants are more than 5 feet from glazing and not in direct sunlight this requirement does
not apply.
Note to reviewers: we need to be clear about special spaces such as saunas, natatoriums, exercise
rooms, kitchens, showers, restaurant seating next to overhead doors, partially conditioned
atriums, facilities remote from power (e.g. park ranger pay station), equipment rooms, laundry,
work areas, semi-industrial spaces, auto repair, shipping /receiving, transportation platforms,
hospital operating rooms, etc.
TABLE XX –
Interior surface temperature limits
WWR (Window
to wall ratio)
Occupied zone
distance from
glazing
Maximum
(cooling)
Minimum
(heating)
Maximum solar
transmission
20% 2’ 80*F 60*F ___
4’
6’ 90*F 50*F ___
80% 2’ 76*F 65*F ___
4’
6’ 85*F 55*F
Notes for table XX:
1. Maximum and minimum interior surface temperature shall be the glazing surface
temperature at cooling and heating design conditions. If shades or blinds are used, then
it is permissible to use the shade or blind interior surface temperature.
2. Maximum solar transmission is the amount of solar radiation penetrating the glazing plus
blind assembly. Transmission shall be determined at the cooling design condition and
shall include direct and diffuse radiation. It is permissible to include the effect of
interior shades or blinds.
Additional Sections
Note to authors: We might consider sections such as the following that are motivated by similar
ones that exist in 62.1 and 189.1:
7 System Startup Plan
8 Operations and Maintenance Plan
