# PUBLIC PROPOSAL FORM ![](media/image1.png){width="1.1319444444444444in" height="1.4430555555555555in"}

## FOR PUBLIC PROPOSALS ON THE INTERNATIONAL CODES 

## 2003/2004 CODE DEVELOPMENT CYCLE

***PLEASE SEE REVERSE FOR INSTRUCTIONS ON SUBMITTING PUBLIC PROPOSALS.
PROPOSALS MUST COMPLY WITH THESE INSTRUCTIONS.***

> **CLOSING DATE: [All Proposals Must Be Received by March 24,
> 2003]{.underline}.**

1)  **Indicate the format in which you would like to receive your Public
    Proposals Monograph (PPM), Report of the Hearing (ROH) and Final
    Action Agenda (FAA):**

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  **x**      Paper                 \* CD               \*Download from ICC Website

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(\*Note: A paper copy will not be sent to you if you have chosen the CD
or Download format.)

**2) PLEASE TYPE OR PRINT CLEARLY: FORMS WILL BE RETURNED if they
contain unreadable information.**

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  Name:                                  Ronald Majette                                                      Date:   March 21,
                                                                                                                     2003
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  Jurisdiction/Company:                                 U.S.                                                         
                                                        Department                                                   
                                                        of Energy                                                    

  Submitted on Behalf of:                               U.S.                                                         
                                                        Department                                                   
                                                        of Energy                                                    

  Address:                               1000                                                                        
                                         Independence                                                                
                                         Avenue, EE-2J,                                                              
                                         1J-018                                                                      

  City:                   Washington                                 State:   DC       Zip    20585                  
                                                                                       +4:                           

  Phone:                  202-586-7935                               Ext:              Fax:   202-486-4617           
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  e-mail:   Ronald.Majette@hq.doe.gov
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  X               Signature on File

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**3) \*Signature:**

\*I hereby grant the International Code Council the nonexclusive,
royalty-free rights, including nonexclusive, royalty-free rights in
copyright in this Proposal and I understand that I acquire no rights in
any publication of International Code Council (ICC), in which this
Proposal in this or another similar analogous form is used. I hereby
attest that I have the authority and I am empowered to grant this
copyright release.

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  **Indicate if this           **will**      **X**      **will      **increase the cost of
  Proposal:**                                           not**       construction.**

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**4)** **Cost Impact:**

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  IECC

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**5)** Indicate appropriate International Code(s) associated with this
Public Proposal -- [Please use Acronym]{.underline}:

(See back of this form or the instructions for list of names and
acronyms for the International Codes):

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  **6)**   **Revision     ** x**           **Section**   ** 803.2.6 &     ** **      **Table**      ** **               **Figure**   ** **
           to:**                                         803.3.3.5**                                                                 

                                                                                                                                     

  **7)**   **PROPOSAL**   **Please                                                                                                   
                          check                                                                                                      
                          appropriate                                                                                                
                          box:**                                                                                                     
  -------- -------------- ------------- -- ------------- ------------- -- ------- -- ----------- -- ---------- -- -- -- ------------ -------------

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  **X**      **Revise as           **Add new        **X**      **Delete and               **Delete without
             follows:**            text as                     substitute as              Substitution(s):**
                                   follows**                   follows:**                 

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  **Show the proposed NEW, REVISED or DELETED TEXT in legislative format:
  ~~Line through text to be deleted.~~ [Underline text to be
  added.]{.underline}**

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**SECTION 802**

**803.2.6 Cooling with outdoor air.** ~~Each system with a cooling
capacity greater than 65,000 Btu/h (19 kW) located in other than Climate
Zones 1, 2, 3b, 5a or 6b as shown in Table 302.1 shall have an
economizer that will automatically shut off the cooling system and allow
all of the supply air to be provided directly from outdoors.~~ [Supply
air economizers shall be provided on each cooling system as shown in
Table 803.2.6(1).]{.underline}

Economizers shall be capable of operating at 100 percent outside air,
even if additional mechanical cooling is required to meet the cooling
load of the building. Where a single room or space is supplied by
multiple air systems, the aggregate capacity of those systems shall be
used in applying this requirement.

**Exceptions:**

1\. Where the cooling equipment is covered by the minimum efficiency
requirements of Table 803.2.2(1) or 803.2.2(2) and ~~meets the
efficiency requirements of Table 803.2.6~~ [meets or exceeds the minimum
cooling efficiency requirement (EER) by the percentages shown in Table
803.2.6(2).]{.underline}

2\. Systems with air or evaporatively cooled condensers and which serve
spaces with open case refrigeration or that require filtration equipment
in order to meet the minimum ventilation requirements

of Chapter 4 of the International Mechanical Code*.*

~~3. Systems under 135,000 Btu/h (40 kW) cooling capacity in Climate
Zones 3c, 5b, 7, 13b, and 14.~~

*{Delete Table 803.2.6 and replace with new Table 803.2.6(1) and Table
803.2.6(2) below}*

Table 803.2.6(1) Economizer Requirements

  ------------------------- ---------------------------------------------
  **Climate Zones**         **Economizer Requirement**

  1A, 1B, 2A, 3A, 4A, 7,8   No Requirement

  2B, 3B, 3C, 4B, 4C, 5B,   Economizers on All Cooling Systems ≥ 65,000
  5C, 6B                    Btu/h

  5A, 6A                    Economizers on All Cooling Systems ≥ 135,000
                            Btu/h
  ------------------------- ---------------------------------------------

Table 803.2.6(2) Equipment Efficiency Performance Exception for
Economizers

  ----------------- -----------------------------------------------------
  **Climate Zones** **Cooling Equipment Performance Improvement (EER or
                    COP)**

  2B                10% Efficiency Improvement

  3B                15% Efficiency Improvement

  4B                20% Efficiency Improvement
  ----------------- -----------------------------------------------------

**803.3.3.5 Economizers.** ~~Economizers shall be provided on each
system with a cooling capacity greater than 65,000 Btu/h (19 kW) in
accordance with Section 803.2.6.~~ Supply air economizers shall be
provided on each cooling system according to Table 803.2.6(1).
Economizers shall be capable of operating at 100% outside air, even if
additional mechanical cooling is required to meet the cooling load of
the building.

**Exception[s]{.underline}:**

> 1\) [Systems utilizing]{.underline} ~~W~~water economizers that are
> capable of cooling supply air by direct and/or indirect evaporation
> and providing up to 100 percent of the expected system cooling load at
> outside air temperatures of 50°F (10°C) dry bulb/45°F (7°C) wet bulb
> and below.
>
> ~~2) Systems under 135,000 Btu/h (40 kW) cooling capacity in Climate
> Zones 3c, 5b, 7, 13b and 14.~~
>
> [2) Where the cooling equipment is covered by the minimum efficiency
> requirements of Table 803.2.2(1), 803.2.2(2), or 803.3.2(1) and meets
> or exceeds the minimum EER by the percentages shown in Table
> 803.2.6(2)]{.underline}
>
> [3) Where the cooling equipment is covered by the minimum efficiency
> requirements of Table 803.3.2(2) and meets or exceeds the minimum
> integrated part load value (IPLV) by the percentages shown in Table
> 803.2.6(2)]{.underline}

**8) SUPPORTING INFORMATION (State purpose and reason, and provide
substantiation to support proposed change):**

The proposed requirement maps the current economizer requirements (based
on ASHRAE Standard 90.1-1999) to the proposed new IECC climate zones
with some modification. The current economizer requirements are based on
estimates of cost-effectiveness for air-side economizers. Because much
of the costs of including an economizer are related to controls and
independent of capacity, more favorable conditions are needed for small
systems to be judged cost effective than for large systems, hence the
capacity dependency in current requirements and the proposed Table
803.2.6.

The current economizer requirements are based on number of hours between
55 and 69 F, when an economizer could normally be used, adjusted for
locations expected to be too humid (based on a 1% design wetbulb
measure) to make use of economizers during the cooling season. This was
one of the characteristics used in the climate analysis conducted by
PNNL

In mapping the current requirements, it was clear that climates zones 7
and 8 typically have too few cooling hours for an economizer to be
cost-effective. While the current requirements use the design wetbulb
temperature as a proxy for humidity, a thorough review of climate data
suggests that it is not a very good proxy for the humidity during the
conditions when an economizer normally would be used. For this reason,
we have proposed maintaining the spirit of the 90.1-1999 requirements by
not requiring economizers in climates zones that are tropical (1A, 1B),
hot & humid (2A, 3A), or mixed humid conditions (4A). In both the cold
and in these humid climates, the failure of an economizer in an open
condition can easily negate the limited savings potential during
favorable economizer conditions. For the pacific coastal zones (3C, 4C,
5C), we have suggested requiring economizers on all systems down to
65,000 Btu/h as the number of hours that economizers can be used in
these climates makes them extremely cost-effective. This is also seen in
the current requirements. For the climate zones classified as dry (2B,
3B, 4B, 5B, and 6B) we have suggested requiring economizers on all
systems down to 65,000 Btu/h as the dryness of these climates allows the
simplest, lowest cost economizer control strategy to be effective.
Climate zones 5A and 6A are characterized by short humid summers coupled
with mild swing seasons and cold winters. In these climates, we have
suggested that economizers only be required on systems greater than
135,000 Btu/h capacity to reflect the limited usability of the
economizer during the summer season and the fact that smaller systems
would commonly be installed on small buildings with generally limited
cooling during the swing seasons.

The economizer tradeoffs have been provided in terms of percentages
above the minimum EER or in the case of chiller systems, the IPLV
cooling requirements. This simplifies the application to a broad
category of cooling equipment at the expense of requiring a simple
calculation to get the allowed EER or IPLV levels for the tradeoff.
These tradeoffs are approximately those provided by the existing EER
tradeoffs in the current requirements; however they are extendable to
the chiller equipment, or condenser systems.

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         SUPPORTING INFORMATION *Continued* (Attach additional sheets as
         necessary)

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**PLEASE USE SEPARATE FORM FOR EACH PROPOSAL**

**SUBMITTAL AS A DOCUMENT ATTACHMED TO AN E-MAIL IS PREFERRED**

(SEE REVERSE FOR DIRECTIONS ON WHERE TO SEND PROPOSALS)