2019 California Energy Standards Continue Pursuit of ZNE

2019 California Energy Standards Continue Pursuit of ZNE
Photo source
aamanet.org
The new 2019 California Energy Standards, slated to take effect January 1, 2020, continues the state’s pursuit of its goal to achieve zero net energy (ZNE) by 2020 for residences and by 2030 for commercial buildings.

Also known as Title 24 (Part 6), the standard defines ZNE as consuming only as much energy on an annual basis as can be generated on-site with a renewable energy system. To promote the renewable energy aspect, reported Joe Hayden (Pella) during the AAMA Western Region Summit, the 2019 standards make California the first in the nation to establish solar photovoltaic (PV) electricity-generating systems as a prescriptive requirement.

To meet the goal of substantially reducing a home’s impact on the electrical grid through the use of PV, grid harmonization strategies are introduced that offer compliance credits for PV accompanied by battery storage.

The standard is based on 16 defined climate zones across the state and includes mandatory measures (that always have to be done), prescriptive standards (which, per Hayden, can sometimes be too restrictive for builders and designers seeking credit for installed features) and an alternative performance approach based on computer calculations that allows trade-offs (e.g., more efficient windows vs. more efficient air conditioners). So far, more than 90 percent of all compliance is achieved via the alternative performance approach.

“To navigate compliance, you must know what the compliance documents say,” said Hayden.

The 2019 standard tightens prescriptive requirements by continuing the 20-year trend of reducing maximum permissible residential window U-factor to 0.30 statewide, and SHGC to 0.23 (except in climate zones along the coast and in the northern/northeastern mountainous regions where there is no SHGC requirement). Replacement windows must meet the same requirements, except up to 75 square feet can have a U-factor of 0.40 and an SHGC of 0.35. The prescriptive U-factor for non-fire-rated doors, which had held steady at 0.50 through 2016, now changes to 0.20. The door U-factor limit applies to exterior doors with less than 25 percent glazing; those with more glazing are treated as windows. Skylights are limited to 16 sq. ft., with a U-factor of 0.55 and an SHGC of 0.30.

Hayden showed an example of the performance approach in which ZNE is achieved (compared to a 2006 IECC-compliant design) through a combination of photovoltaics, a more energy-efficient HVAC system, and reconfigured lighting, appliance and plug loads.

On the commercial side, prescriptive values are the same in all climate zones and remain unchanged from 2016. National Fenestration Rating Council (NFRC) ratings (traditional or Component Modeling Approach) are necessary to meet the prescriptive values and to get full alternative credit for product performance.

The California Energy Standards are updated every three years, and work is aleady underway on the 2022 version. A variety of stakeholder workshops will be held to better define metrics through 2020, and the drafting of the updated standard through various hearings will begin in 2021. To get involved, visit title24stakeholders.com.

Hayden acknowledged and expressed appreciation for the contributions from Ken Nittler, President of WESTLab, to Hayden’s report and presentation.

600450 2019 California Energy Standards Continue Pursuit of ZNE glassonweb.com

Others also read

The mobile- and device-friendly website highlights the extensive glass fabrication capabilities of CGH’s family of companies across both architectural and security glass divisions.
NSG Group has announced today a joint development agreement between its subsidiary and Ubiquitous Energy, a leader in transparent solar technology.
There’s a stark reality to designing glass entries – they remain vulnerable to impact. Nowhere is this vulnerability felt more strongly than in design for education facilities. The increase in school shootings has become a sad reality in American education.
Monticello is Thomas Jefferson’s estate, preserved now as a UNESCO World Heritage Site, it serves as a museum, place of study and research, and a historical site.
The Window and Door Manufacturers Association (WDMA) issued the following statement regarding the announcement of a deal that would lift the Section 232 tariffs on steel and aluminum, 25% and 10% respectively, on Canada and Mexico.
CMS Window Systems has maintained a zero waste to landfill rate for the second year in a row, ensuring it continues to lead the way in the re-use and recycling of waste collected throughout its manufacturing and installation operations.

From industry

10301 North Enterprise Drive
Mequon, WI 53092
United States

10924 Granite Street, Suite 200
Charlotte, NC 28273
United States

NEWS RELATED PRODUCTS

Diamon-Fusion International, Inc.
Diamon-Fusion International, Inc.
Trex Commercial Products
HHH Tempering Resources, Inc.
Diamon-Fusion International, Inc.
Trex Commercial Products

Add new comment