Public Reviews for Standard 90.1, May 2019
The following addenda from ANSI/ASHRAE/IES Standard 90.1-2016, Energy Standard for Buildings Except Low-Rise Residential Buildings, are under a 30-day public review from May 10 to June 9:
In reviewing the final draft for publication, it was noted that the rating conditions for the return air were listed as dry bulb and wet bulb, which is the typical method used for this, but the AHRI 1360 rating standard and the current ASHRAE 90.1 table 6.8.1-11 uses dry bulb and dew point. This ISC is being released to cover the change from wet bulb to dew point in tables 6.8.1-11 and 6.8.1-19 in both the IP and SI versions.
For the third public review, changes are being made to correct references to products in table F-4 to align exactly with the DOE requirements.
For the third public review ISC, the following changes have been made. This draft adds back footnotes f and g and renumbers the footnotes that follow. Footnotes f and g were incorrectly deleted as part of the 2nd public review ISC. In the SI version of table F-5, the footnotes c and d have been revised to have the correct reference to the appropriate requirement in alignment with the IP table F-5. In table 6.8.1-6 (both IP and SI versions), test procedure references made to the CFR should not include “Part”. For example, the Test Procedure reference for Oil fired hot water boilers >300,000 Btu/h should be “10 CFR 431.86” instead of “10 CFR Part 431.86”, so this change has been included in the third public review ISC.
New DOE refrigeration minimum efficiency requirements went into effect on March 27, 2017, and this addendum updates the requirements in tables 6.8.1-12 and 6.8.1-13 to align with the DOE requirements. There were also some nomenclature and other changes which have also been updated in this addendum.
In response to comments from the first public review of Addendum by, two additional exceptions are being added to (a) exempt smaller buildings and additions from this requirement, and (b) clarify that alterations (e.g. roof equipment, lighting, or other replacement or upgrades) do not trigger this requirement.
This addendum revises the Title Purpose and Scope (TPS) of Standard 90.1 to apply to areas outside of the physical building. The addendum introduces a new term “site” to define those types of environments where a physical building may not be present, but the energy consuming lighting and equipment are covered by provisions in the Standard. Also, a new provision is included in Chapter 4 “Administration and Enforcement” to address sites with or without buildings.
This addendum is intended to be primarily a clarification of the original intention for bypass and control to permit economizer operation.
The Department of Energy commented that for products in US applications, manufacturers must obtain a waiver from the department to be allowed to sell Walk-in Coolers and Walk-in Freezers that employ vacuum-insulated glazing. They asked that this information be included in the standard. This information has been included as an informative note. This is the only change in the scope of this public review.
This proposed ISC to Addendum ck addresses several public review comments. Language was added to clarify that renewable energy systems included in the Proposed Design must be modeled identically in the Baseline model except for the capacity. Performance criteria to be used when estimating on-site renewable energy when none exists in the Proposed Design have also been changed. Panel efficiency was increased to 19.1% and total system losses reduced to 11.3% based on a report published by NREL in November 2018, entitled "U.S. Solar Photovoltaic System Cost Benchmark: Q1 2018".
This addendum corrects the reference that allows VAV budget systems to be modeled with constant volume zones due to minimum air change requirements (such as when required by a healthcare code) and aligns the minimum airflow requirements for VAV boxes in Section 11 with the requirements in Section 6.5.2.1.
This ISC addresses comments to the 1stPRD asking that PCIt remain independent of any renewable energy included in the Proposed Design that is not required prescriptively. The ISC also makes a change to the definition of PBPPRE so that the method used to determine the prescriptive on-site renewable allowance is the same as in Section 11. These changes will allow Appendix G to continue to be used by other standards and guidelines such as ASHRAE Standard 189.1 that would have been negatively impacted by the original proposal.
Federal regulations for ceiling fan testing have been in effect since January 23, 2017. 10 CFR Appendix U to Subpart B of Part 430, “Uniform Test Method for Measuring the Energy Consumption of Ceiling Fans” provides test procedures for determining the airflow and power consumption of ceiling fans. The purpose of this addendum is to ensure that the maximum fan power input is properly reported for installations both inside and outside the United States. This is addendum is similar to the current requirements for elevators in Standard 90.1 and is intended to set the stage for the future addition of ceiling fan efficiency requirements.
The proposed addendum introduces a building envelope backstop, striving to preserve design flexibility and minimize documentation effort while improving the long-term building performance. Projects can comply with the proposed envelope backstop by either meeting the prescriptive envelope requirements in Section 5.5 or using Section 5.6 “Building Envelope Trade-Off Option” to demonstrate that the energy cost penalty from the proposed below-code envelope does not exceed the set margins.
This addendum updates the informative appendix containing informative references in Standard 90.1.
This addendum updates the revision date for ATC-105 from 2000 to 2019.
This addendum deletes Table 6.8.1-8 as well as the reference to the table in Section 6.4.1.1h, while renumbering these sections appropriately. However, the test procedure requirement for heat exchanger rating will be retained as there continues to be significant benefit to the Industry from ratings that are in compliance with AHRI 400. Therefore, this addendum will add 6.4.7 to require that liquid to liquid heat exchangers that fall under the scope of AHRI 400 be rated in accordance with AHRI 400.
This proposal updates the lighting control requirements for parking garages in Section 9.4.1.2.
This proposal changes the daylight responsive requirements from continuous dimming or stepped control to continuous dimming required for all spaces. The proposal also adds a definition for continuous dimming that is very similar to the NEMA LSD-64 2014 definition.
This proposal is a simple cleanup of an error in an exception to the sidelighting requirements that inadvertently set an exact measurement for an obstruction, and it clarifies that the setback distance is a horizontal measurement. The exception is further amended to include natural objects as an obstruction.