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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules
CPWG recommended the following definition for SVIL pumps:
Small vertical in-line pump means a single stage, single-axis flow, dry rotor, rotodynamic pump that:
1 Has a shaft input power less than 1
horse power at best efficiency point at full impeller diameter, 2 Is distributed in commerce with a motor that does not have to be in a horizontal position to function as designed, and 3 Discharges the pumped liquid through a volute in a plane perpendicular to the shaft.

Docket No. EERE2016BTSTD0004, No. 58, Recommendation 3C at p. 3
DOE seeks comment and feedback on the scope and definitions recommended by the CPWG, including whether
anything has changed in the market since the conclusion of the CPWG that would impact the recommended scope and definitions for SVIL pumps.
DOE seeks feedback and information regarding whether it may be appropriate to include SVIL pumps in the circulator pumps rulemaking, in the commercial and industrial pumps rulemaking, or in a separate rulemaking.
DOE seeks comment regarding any other topics related to scope and definitions for circulator pumps and SVIL pumps.
B. Metric for Circulator Pumps The CPWG focused on defining a performance-based metric that was
similar to the pump energy index PEI metric established in the January 2016 TP final rule. Docket No.
EERE2016BTSTD0004, No. 64 at pp. 246247 The CPWG recommended using the PEICIRC metric, which would be defined as the pump energy rating PER for the rated circulator pump model PERCIRC, divided by the PER
for a circulator that is minimally compliant with energy conservation standards serving the same hydraulic load PERCIRC,STD. Docket No.
EERE2016BTSTD0004, No. 58, Recommendation 5 at p. 4
The equation for PEICIRC is shown in the equation 1:

PERcrnc

PElcrnc
= PERcrnc,srD

1

Docket No. EERE2016BTSTD0004, No. 58 Recommendation 5 at p. 4
PERCIRC would be determined as the weighted average input power to the circulator motor or controls, if available, of a given circulator over a number of specified load points. Due to differences in the various control varieties available with circulator pumps, the CPWG
recommended that each circulator pump control variety have unique weights and load points that are used in determining PERCIRC. Docket No.
EERE2016BTSTD0004, No. 58
Recommendations 6A and 6B at pp.
46 The test points, weights, and test methods necessary for calculating PERCIRC for pressure controls, temperature controls, manual speed controls, external input signal controls, and circulator pumps with no control i.e., without external input signal, manual, pressure, or temperature control 9 are described in II.C.1 of this document.
9 As discussed previously in section III.A.5, in this document, circulator pumps with no controls are also inclusive of other potential control varieties that have a control, but are not one of the identified circulator control varieties. DOE refers to these as circulator pumps with no controls throughout this document, as any circulator pump without one of the defined control varieties would be treated as a circulator pump with no controls, regardless of whether it is a single-speed circulator or has a control variety not defined in this test procedure.

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PERCIRC,STD would be determined similarly for all circulator pumps, regardless of control variety.
PERCIRC,STD would represent the weighted average input power to a minimally compliant circulator pump serving the same hydraulic load. As such, PERCIRC,STD would essentially define the minimally compliant circulator pump performance, such that the energy conservation standard level would always be defined as 1.00, and lower PEICIRC values would represent better performance. The CPWG
discussed the derivation of PERCIRC,STD
at length during the CPWG negotiations and, ultimately, recommended a standard level that is nominally equivalent to a single-speed circulator equipped with an electrically commutated motor. Docket No. EERE
2016BTSTD0004, No. 102 at pp. 53
56; Docket No. EERE2016BTSTD
0004, No. 98 Recommendations 1 and 2AD at pp. 14
The CPWG specified a method for determining PERCIRC,STD equivalent to the test method recommended for circulator pumps with no controls, with additional procedures necessary to determine the minimally compliant overall efficiency at the various test points based on the hydraulic performance of the rated circulator pump. Docket No. EERE2016BT
STD0004, No. 98 Recommendations 2AD at pp. 14 However, because PERCIRC,STD would represent the energy conservation standard level, DOE
would, in a potential future circulator pump ECS rulemaking, discuss in detail
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the derivation of PERCIRC,STD for the recommended standard level, as well as all of the efficiency levels presented to the CPWG, including assessment of the technical feasibility and economic justification for any adopted levels.
Docket No. EERE2016BTSTD0004
DOE requests comment on the CPWG
recommendation to adopt PEICIRC as the metric to characterize the energy use of certain circulator pumps and on the recommended equation for PEICIRC, including whether anything in the technology or market has changed since publication of the 2016 Term Sheets that would lead to this metric no longer being appropriate.
C. Test Procedure for Circulator Pumps There is no current industry test procedure for circulator pumps. The September 2016 CPWG Term Sheet contained extensive recommendations related to development of a test procedure for circulator pumps. Docket No. EERE2016BTSTD0004, No. 58, Recommendations 612 at p. 49
1. Test Methods for Different Categories and Control Varieties Many circulator pumps are sold with a variable speed drive and controls i.e., logic or user interface with various control strategies that reduce the required power input at a given flow rate to save energy. The ability of a circulator pump to operate at different speeds and the control logic of each control variety will impact the energy use for that circulator pump model in the field. To reflect this variation in energy consumption, the CPWG

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Where:
PERCIRC = circulator pump energy rating hp; and PERCIRC,STD = pump energy rating for a minimally compliant circulator pump serving the same hydraulic load.