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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules
loads of a conditioned space at a lower speed, and therefore lower input power, than those with differential pressure controls. This is because they can account for the differential temperature between the space and supplied hot water, delivering a constant BTU/hr load to the space when less heat is needed even in a given zone or zones.
DOE seeks information on the technologies listed in Table III.1
regarding their applicability to the current market and how these technologies may impact the efficiency of circulator pumps as measured according to the DOE test procedure.
Specifically, DOE seeks information on the range of efficiencies or performance characteristics that are currently available for each technology option.
DOE seeks information on the technologies listed in Table III.1
regarding their market adoption, costs, and any concerns with incorporating them into products e.g., impacts on consumer utility, potential safety concerns, manufacturing/production/
implementation issues, etc..
DOE seeks comment on other technology options that it should consider for inclusion in its analysis and if these technologies may impact product features or consumer utility.
B. Screening Analysis The purpose of the screening analysis is to evaluate the technologies that improve equipment efficiency to determine which technologies will be eliminated from further consideration and which will be passed to the engineering analysis for further consideration.
DOE determines whether to eliminate certain technology options from further consideration based on the following criteria:
1 Technological feasibility. Technologies that are not incorporated in commercial products or in working prototypes will not be considered further.
2 Practicability to manufacture, install, and service. If it is determined that mass production of a technology in commercial products and reliable installation and servicing of the technology could not be achieved on the scale necessary to serve the relevant market at the time of the compliance date of the standard, then that technology will not be considered further.
3 Impacts on equipment utility or equipment availability. If a technology is determined to have significant adverse impact on the utility of the equipment to significant subgroups of consumers, or result in the unavailability of any covered equipment type with performance characteristics including reliability, features, sizes, capacities, and volumes that are substantially the same as equipment
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generally available in the United States at the time, it will not be considered further.
4 Adverse impacts on health or safety. If it is determined that a technology will have significant adverse impacts on health or safety, it will not be considered further.
5 Unique-Pathway Proprietary Technologies. If a design option utilizes proprietary technology that represents a unique pathway to achieving a given efficiency level, that technology will not be considered further due to the potential for monopolistic concerns.

10 CFR 431.4; 10 CFR part 430, subpart C, appendix A, 6c3 and 7b Technology options identified in the technology assessment are evaluated against these criteria using DOE
analyses and inputs from interested parties e.g., manufacturers, trade organizations, and energy efficiency advocates. Technologies that pass through the screening analysis are referred to as design options in the engineering analysis. Technology options that fail to meet one or more of the five criteria are eliminated from consideration.
DOE requests feedback on what impact, if any, the five screening criteria described in this section would have on each of the technology options listed in Table III.1 with respect to circulator pumps. Similarly, DOE seeks information regarding how these same criteria would affect any other technology options not already identified in this document with respect to their potential use in circulator pumps.
C. Engineering Analysis The purpose of the engineering analysis is to establish the relationship between the efficiency and cost of circulator pumps. There are two elements to consider in the engineering analysis: The selection of efficiency levels to analyze i.e., the efficiency analysis and the determination of product cost at each efficiency level i.e., the cost analysis. In determining the performance of higher-efficiency equipment, DOE considers technologies and design option combinations not eliminated by the screening analysis.
For each equipment class, DOE
estimates the baseline cost, as well as the incremental cost for the equipment at efficiency levels above the baseline.
The output of the engineering analysis is a set of cost-efficiency curves that are used in downstream analyses i.e., the life-cycle cost LCC and payback period PBP analyses and the NIA.
1. Efficiency Analysis DOE typically uses one of two approaches to develop energy efficiency levels for the engineering analysis: 1

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Relying on observed efficiency levels in the market i.e., the efficiency-level approach, or 2 determining the incremental efficiency improvements associated with incorporating specific design options to a baseline model i.e., the design-option approach. Using the efficiency-level approach, the efficiency levels established for the analysis are determined based on the market distribution of existing products in other words, based on the range of efficiencies and efficiency level clusters that already exist on the market. Using the design option approach, the efficiency levels established for the analysis are determined through detailed engineering calculations and/or computer simulations of the efficiency improvements from implementing specific design options that have been identified in the technology assessment.
DOE may also rely on a combination of these two approaches. For example, the efficiency-level approach based on actual products on the market may be extended using the design option approach to interpolate to define gap fill levels to bridge large gaps between other identified efficiency levels and/or to extrapolate to the max-tech level particularly in cases where the maxtech level exceeds the maximum efficiency level currently available on the market.
Although DOE has not developed a formal engineering analysis, DOE
supported the CPWG by providing some engineering-like analysis based on the efficiency-level approach. The analysis was presented over a series of working sessions, transcripts and accompanying material for which is available in the rulemaking docket. Docket No. EERE
2016BTSTD0004
For each established equipment class, DOE selects a baseline model as a reference point against which any changes resulting from new or amended energy conservation standards can be measured. The baseline model in each equipment class represents the characteristics of common or typical products in that class. Typically, a baseline model is one that meets the current minimum energy conservation standards and provides basic consumer utility.
DOE requests feedback on appropriate baseline efficiency levels for DOE to apply to each equipment class in evaluating whether to establish energy conservation standards for these products.
DOE requests feedback on the appropriate baseline efficiency levels for any newly analyzed equipment classes that are not currently in place or for the
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