8-F-i

APPENDIX 8-F. LCC AND PBP RESULTS USING ALTERNATIVE BASE CASE 

EFFICIENCY DISTRIBUTION

TABLE OF CONTENTS

8-F.1 INTRODUCTION ..................................................................................................8-F-1

8-F.2 LCC AND PBP RESULTS USING ALTERNATIVE BASE CASE 

EFFICIENCY DISTRIBUTION ............................................................................8-F-2

LIST OF TABLES

Table 8-F.1.1 Standard-Sized Dishwashers: Alternative Base Case Efficiency Market 

Shares for 2013 and 2018 ...........................................................................8-F-2

Table 8-F.2.1 Standard-Sized Dishwashers: Rebuttable Payback Periods........................8-F-2

Table 8-F.2.2 Standard-Sized Dishwashers: Rebuttable Payback Periods........................8-F-3

LIST OF FIGURE

Figure 5-P.1.1 Historic and Projected Base Case Trend in Standard Dishwasher 

Average Annual Energy Use ......................................................................8-F-1
8-F-1

APPENDIX 8-F. LCC AND PBP RESULTS USING ALTERNATIVE BASE CASE 

EFFICIENCY DISTRIBUTION 

8-F.1 INTRODUCTION

As an alternative to the base case efficiency distribution described in chapter 8, for 

standard-sized dishwashers DOE used an approach based on data from AHAM for 1994 through 

2010. The AHAM data reflect measurements using the DOE test procedure, which was modified 

in 2004. The main change affecting energy use was the inclusion of standby power. Therefore, 

DOE added estimated average standby energy use (as given in the data from AHAM for 2008-

2010 cited below) to the data for 1994-2003 to create a consistent time-series. DOE fit an 

exponential curve to the adjusted 1994-2010 series to estimate average kWh per year in 2013 and 

2018 (see figure below). DOE assumed that the trend would level off at the max-tech efficiency 

level.

Figure 8-F.1.1 Historic and Projected Base Case Trend in Standard 

Dishwasher Average Annual Energy Use

150

200

250

300

350

400

450

1990 2000 2010 2020 2030 2040 2050

Annual Energy Use (kWh/year)

AHAM Data

Projected Values

Expon. (AHAM Data)
8-F-2

To estimate the base-case efficiency distribution for 2013 and 2018, DOE relied on data 

submitted by AHAM for the current rulemaking. These data provide shares of shipments by 

efficiency level for 2002–2005 and 2008–2010. The efficiency distributions for 2002-2005 were 

provided by AHAM in a data submittal for an earlier standards rulemaking.a The efficiency 

distributions for 2008-2010 were provided by AHAM in its more recent data submittal as 

described in Chapter 5. To predict the market shares for each efficiency level in 2013 and 2018,

DOE considered the shares and market trends present in the AHAM data and assumed these 

trends would continue in a manner consistent with the decline in average energy use. The 

projected (2013 and 2018) market shares are shown in the table below.

Table 8-F.1.1 Standard-Sized Dishwashers: Alternative Base Case Efficiency Market 

Shares for 2013 and 2018

Efficiency Level Annual Energy 

Use (kWh)

Water Use 

(gal/cycle)

2013 Market 

Share

2018 Market 

Share

Baseline 355 6.50 3.8% 3.8%

1 324 5.80 43.2% 15.1%

2 307 5.00 28.0% 32.7%

3 295 4.25 16.4% 18.5%

4 234 3.80 8.6% 14.7%

5 180 1.60 0.0% 15.1%

8-F.2 LCC AND PBP RESULTS USING ALTERNATIVE BASE CASE 

EFFICIENCY DISTRIBUTION

Tables 8F.2.1 and 8F.2.2 present the rebuttable PBPs for standard-sized and compact 

dishwashers, respectively.

Table 8-F.2.1 Standard-Sized Dishwashers: Rebuttable Payback Periods

Efficiency Level AEU

kWh/year

Water Use 

gal/cycle

Rebuttable PBP

years

Baseline 355 6.50 -

1 324 5.80 5.26

2 307 5.00 5.40

3 295 4.25 8.85

4 234 3.80 5.57

5 180 1.60 4.00

 

a Association of Home Appliance Manufacturers. AHAM Data on Dishwashers for Efficiency Standards 

Rulemaking, September 7, 2006. Letter to Building Technologies Program, U.S. Department of Energy.
8-F-3

Table 8-F.2.2 Standard-Sized Dishwashers: Rebuttable Payback Periods

Efficiency Level AEU

kWh/year

Water Use 

gal/cycle

Rebuttable PBP

years

Baseline 260 4.50 -

1 222 3.50 0.23

2 154 2.10 1.02