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Clothes Dryers - SF, MH, and MF in-unit | Regional Technical Forum Regional Technical Forum

The RTF is a technical advisory committee to the Northwest Power and Conservation Council established in 1999 to develop standards to verify and evaluate energy efficiency savings

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Efficient residential clothes dryers use less energy than other dryers to remove moisture from clothing.  Conventional electric dryers use electric resistance heating to dry the clothes. Efficient conventional dryers use auto-termination controls effectively to minimize over-drying.  More efficient electric dryers use heat pumps for heating.

There are measure applications for both vented and ventless dryers because of the differences in how these technologies interact with HVAC loads.  To qualify for this measure dryers must have a capacity of 4.0 cubic feet or greater which is slightly smaller than the federal definition of a standard size dryer, which is 4.4 cubic feet.

WorkbookLatest Version Residential Clothes Dryers v4.1 File Residential Clothes Dryers v4.1 Post-QC workbook. Approved December 2020. Date Jan 19, 2021Version number  4.1 Past Versions
version date document
4.0
Dec 8, 2020
File Residential Clothes Dryers Workbook v4.0
Approved at the December 2020 RTF meeting. Currently undergoing QC.
3.1
Jul 23, 2018
File Residential Clothes Dryers v3.1
Post-QC workbook. Approved May 2018.
3.0
Jun 18, 2018
File ResClothesDryers_v3.0.xlsm
Pre-QC workbook. Approved May 2018.
2.1
Oct 19, 2017
File ResClothesDryers_v2.1.xlsm
Workbook version approved at the July 2017 RTF Meeting. QC review complete.
2.0
Aug 10, 2017
File ResClothesDryers_v2.0.xlsm
Version approved with changes at the July 2017 RTF Meeting. Undergoing QC.
1.4
Dec 2, 2016
File ResClothesDryers_v1_4.xlsm
QC review complete.
1.3
Jun 29, 2016
File ResClothesDryers_v1_3.xlsm
Updated to 7th Plan format and assumptions. Currently undergoing QC.
1.2
May 28, 2015
File ResClothesDryers_v1_2.xlsm
Delivery verification checklist added.
1.1
May 14, 2015
File ResClothesDryers_v1_1.xlsm
QC review complete.
1.0
Apr 21, 2015
File ResidentialDryers_v1_0.xlsm
Original workbook. Currently undergoing QC
DecisionsLatest decisionDecision detailsDecided December 8, 2020 RTF Meeting: December 8, 2020 Approved Measure Updates

Approve the Residential Dryers UES measure update as presented:

Keep the Category at ProvenKeep the Status at ActiveSet the sunset date to December 31, 2025Decided September 10, 2020 RTF Meeting: September 9, 2020 Extend Sunset Date

Extend the sunset date for the following measures to December 2020:

Residential Clothes Washer UESResidential Clothes Dryer UESCommercial Clothes Washer UESDecided July 21, 2020 RTF Meeting: July 21, 2020 Extend Sunset Dates

Extend the sunset date for the Residential Clothes Dryers UES to September 2020. 

Decided May 23, 2018 RTF Meeting: May 22-23, 2018 Approve measure updates

Approve the updates to the Residential Dryers UES measure as presented and

Change the Category of ENERGY STAR applications to ProvenKeep the Category of UCEF-based applications at ProvenKeep the Status at ActiveKeep the sunset date at July 31, 2020Instruct staff to review more detailed data from the RBSA Metering Study and NEEA Field Laundry StudyDecided July 18, 2017 RTF Meeting: July 18, 2017 Approve Measure Updates

Approve updates to the Residential  Clothes Dryers analysis,  including  new UCEF definition,  as presented.

Use the performance ranges shown on slide 43 as measure identifiersFor the ENERGY STAR measure application  set the Category at “Planning”For the UCEF-based measure applications,  set the Category at “Proven”Keep the status at “Active”Set the sunset date to July 31, 2020Update costs with NEEA cost data when availableDecided May 12, 2015 RTF Meeting: May 12, 2015 Approve measure update

Adopt the delivery verification guidance, and related specification changes, as presented for the following UES measures:Single Family Existing HVAC measures; Residential Clothes Washers; Residential Clothes Dryers; New Construction ENERGY STAR WA; New Construction ENERGY STAR OR; Refrigerator/Freezer Decommissioning; School Weatherization; Grocery ECMs for Walk Ins; Industrial and Agricultural Green Motor Rewind; Grocery Door Gasket Replacements.

Decided April 14, 2015 RTF Meeting: April 14, 2015 Approve measure update

Approve the Residential Standard-size Clothes Dryers Research Strategy and UES measure as presented but with standard size defined as 4.0 cubic feet and above. Set the Category to ‘Planning’; Status to ‘Active' and Sunset date to April 30, 2018.

Small/rural checklistLatest Version August 2018 Residential Clothes Dryer Small/Rural Checklist File August 2018 Residential Clothes Dryer Small/Rural Checklist Date Aug 13, 2018Past Versions
version date document
Aug 10, 2017
File ResClothesDryer_SRRUESDesignChecklist.xlsx
Small/Rural Checklist associated with changes adopted at the July 2017 RTF Meeting.
Research Supporting Proven

This measure contains Proven applications for dryers based on their UCEF performance.  The Northwest Energy Efficiency Alliance (NEEA) has done extensive research in recent years to 1) demonstrate that the current federal performance metric, the Combined Energy Factor (CEF), is not an accurate predictor of dryer energy consumption in real world settings and 2) establish a performance metric that more reliably predicts dryer energy consumption in the field. As a result of this research, NEEA has developed the Utility Combined Energy Factor (UCEF) performance metric. While the measure is agnostic to what technologies are used to achieve particular UCEF value, the RTF expects that only heat pump dryers (including hybrid heat pump and resistance dryers) will qualify.

In 2017 NEEA conducted laboratory research of non-ENERGY STAR and conventional (resistance) ENERGY STAR dryers to measure these models' UCEF performance. They found that, on average, conventional ENERGY STAR dryers were more efficient than non-ENERGY STAR ones. After taking this new research into consideration, the RTF changed applications for ENERGY STAR qualified products from Planning to Proven. 

Archived Documents Dryers Research Strategy  This Research Strategy was developed when the measure was Planning. The research objectives have been met and the measure is now Proven.  Archives ELCAP Conservation achievements An advisory committee of: Northwest Power & Conservation Council ©2021 Regional Technical Forum. All Rights Reserved. randomness
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