TRIAL STANDARD LEVELS AND EQUATIONS

Trial Standard Level Selection Criteria

DOE defined five Trial Standard Levels (TSLs) for this Notice of Data Availability 

(NODA), as described below. 

1. TSL 5 represents the maximum technologically feasible (max-tech) level.

2. TSL 4 is an intermediate step between TSL 5 (the max-tech level) and TSL 3 (the maximum 

customer net present value (NPV) level based on a 7-percent discount rate), subject to the 

requirement that the TSL 4 NPV must be positive. Where a sufficient number of efficiency 

levels allow it, TSL 4 is set at least one level below TSL 5 and one level above TSL 3. In 

some cases, the TSL 4 efficiency level equals the TSL 3 level because the next level had a 

negative NPV. In cases where the maximum NPV efficiency level is the penultimate 

efficiency level and the max-tech level showed a positive NPV, the TSL 4 efficiency level is 

also the max-tech level.

3. TSL 3 represents the efficiency level within each equipment class with the highest NPV at a 

7-percent discount rate.

4. TSL 2 represents an intermediate efficiency level between TSL 3 and TSL 1.

5. TSL 1 represents energy use reduction of 10 percent as compared with the current standard 

or the baseline, except that it is reduced to 0 percent for classes where TSL3 is at 0 percent.

DOE analyzed 13 equipment classes for the NODA, and produced 19 cost-efficiency 

curves. TSLs for the full set of equipment classes have been established by extending results 

from primary equipment classes to secondary classes that are similar from an engineering 

perspective. Table 1 (below) maps the secondary equipment classes to those similar, directly 

analyzed equipment classes.

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Table 1: Directly Analyzed Equipment Classes Used to Develop Standards for Secondary 

Classes

Secondary 

Equipment Class

Analyzed Equipment Class 

Associated with Efficiency Level 

for Secondary Equipment Class

RCU-NRC-Small-B RCU-NRC-Large-B

RCU-RC-Small-B RCU-NRC-Large-B

RCU-RC-Large-B RCU-NRC-Large-B

SCU-W-Small-B SCU-W-Large-B

IMH-W-Small-C IMH-A-Small-C

IMH-W-Large-C IMH-A-Large-C

RCU-NRC-Large-C RCU-NRC-Small-C

RCU-RC-Small-C RCU-NRC-Small-C

RCU-RC-Large-C RCU-NRC-Small-C

SCU-W-Small-C SCU-A-Small-C

SCU-W-Large-C SCU-A-Small-C

SCU-A-Large-C SCU-A-Small-C

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Table 2 shows the mapping of each TSL to an efficiency level (represented as a percentage 

improvement over the current standard level or the defined baseline) in each equipment class.

Table 2: Percentage Improvements over Current Standard Level or Baseline by 

Equipment Class for each TSL 

TSL2

Representative Unit

Capacity

Equipment Class Baseline TSL1 TSL3 TSL4 TSL5

IMH-W-Small-B 0% 10% 10% 15% 15% 24% 300 

IMH-W-Med-B 0% 10% 10% 15% 15% 19% 850 

IMH-W-Large-B-1 0% 0% 0% 0% 0% 8% 1,500 

IMH-W-Large-B-2 0% 0% 0% 0% 0% 7% 2,600 

IMH-A-Small-B 0% 10% 15% 18% 18% 26% 300 

IMH-A-Large-B-1 0% 10% 15% 16% 20% 23% 800 

IMH-A-Large-B-2 0% 10% 10% 12% 12% 12% 1,500 

RCU-NRC-Small-B 0% 10% 10% 15% 20% 22% Not Directly Analyzed

RCU-NRC-Large-B1 0% 10% 10% 15% 20% 22% 1,500 

RCU-NRC-Large-B2 0% 10% 10% 15% 20% 21% 2,400 

RCU-RC-Small-B 0% 10% 10% 15% 20% 22% Not Directly Analyzed

RCU-RC-Large-B-1 0% 10% 10% 15% 20% 22% Not Directly Analyzed

RCU-RC-Large-B-2 0% 10% 10% 15% 20% 21% Not Directly Analyzed

SCU-W-Small-B 0% 10% 20% 25% 30% 32% Not Directly Analyzed

SCU-W-Large-B 0% 10% 20% 25% 30% 32% 300 

SCU-A-Small-B 0% 10% 20% 30% 30% 33% 110 

SCU-A-Large-B 0% 10% 20% 25% 30% 29% 200 

IMH-W-Small-C 0% 10% 10% 15% 15% 23% Not Directly Analyzed

IMH-W-Large-C 0% 10% 10% 15% 15% 23% Not Directly Analyzed

IMH-A-Small-C 0% 10% 10% 15% 20% 29% 310 

IMH-A-Large-C 0% 10% 10% 15% 15% 23% 820 

RCU-NRC-Small-C 0% 10% 15% 20% 20% 27% 800 

RCU-NRC-Large-C 0% 10% 10% 15% 15% 23% Not Directly Analyzed

RCU-RC-Small-C 0% 10% 15% 20% 20% 27% Not Directly Analyzed

RCU-RC-Large-C 0% 10% 10% 15% 15% 23% Not Directly Analyzed

SCU-W-Small-C 0% 10% 15% 20% 20% 28% Not Directly Analyzed

SCU-W-Large-C 0% 10% 15% 20% 20% 28% Not Directly Analyzed

SCU-A-Small-C 0% 10% 15% 20% 20% 28% 220 

SCU-A-Large-C 0% 10% 15% 20% 20% 28% Not Directly Analyzed

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Trial Standard Level Equations

Tables 3and 4 show the equations representing energy use in kilowatt-hours per 100 lb of ice as a function of harvest capacity in lb of 

ice produced per day for each TSL by equipment class. In some cases, harvest capacity ranges associated with equipment classes have 

been changed as compared with the capacity ranges associated with the current standards.

Table 3: Equations Representing the TSLs for Batch Equipment Classes (Maximum Energy Use in kWh/100 lb Ice)

Batch Equipment 

Class

Capacity 

Range 

(lb/day)

TSL 1 TSL 2 TSL 3 TSL 4 TSL 5

IMH-W-Small-B <300 7.19-0.00550H 7.19-0.00550H 6.88-0.00550H 6.88-0.0055H 6.32-0.0055H

IMH-W-Med-B ≥300 and 

<850 6.28-0.00247H 6.28-0.00247H 5.90-0.00224H 5.9-0.00224H 5.17-0.00165H

IMH-W-Large-B ≥850 and 

<1500 4.42-0.00028H 4.42-0.00028H

4.00 4.00

3.86-0.00012H

IMH-W-Extended-B

≥1500 and 

<2600 4.00 4.00 3.63+0.00004H

≥2600 3.72

IMH-A-Small-B <300 10.09-0.01060H 10.05-0.01173H 10-0.01233H 10-0.01233H 9.38-0.01233H

IMH-A-Medium-B ≥300 and 

<800 7.81-0.00300H 7.38-0.00284H 7.05-0.0025H 7.19-0.00298H 6.31-0.0021H

IMH-A-Large-B ≥800 and 

<1500 6.21-0.00099H 5.56-0.00056H 5.55-0.00063H 5.04-0.00029 4.65-0.00003H

IMH-A-Extended-B >1500

≥1500 and <1964: 

4.73

≥1964 and <2500:

6.89-0.0011H

≥2500:

4.14

≥1500 and <1973: 

4.72

≥1973 and <2500:

6.89-0.0011H

≥2500:

4.14

≥1500 and <2073: 

4.61

≥2073 and <2500:

6.89-0.0011H

≥2500:

4.14

≥1500 and <2073: 

4.61

≥2073 and <2500:

6.89-0.0011H

≥2500:

4.14

≥1500 and <2073: 

4.61

≥2073 and <2500:

6.89-0.0011H

≥2500:

4.14

RCU-NRC-Small-B <1000 8.35-0.0038H 8.35-0.0038H 8.09-0.0038H 7.84-0.0038H 7.74-0.0038H

RCU-NRC-Large-B ≥1000 and 

<1500

4.55 4.55 4.29 4.04

3.94

RCU-NRC-Extended-B

≥1500 and < 

2400 3.85+0.00006H

≥2400 3.99

RCU-RC-Small-B <947 8.35-0.0038H 8.35-0.0038H 8.09-0.0038H 7.84-0.0038H 7.74-0.0038H

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Batch Equipment 

Class

Capacity 

Range 

(lb/day)

TSL 1 TSL 2 TSL 3 TSL 4 TSL 5

RCU-RC-Large-B ≥947

4.75 4.75 4.49 4.24

4.14

RCU-RC-Extended-B

≥1500 and < 

2400 4.05+0.00006H

≥2400 4.19

SCU-W-Small-B <200 10.64-0.019H 9.88-0.019H 9.5-0.019H 9.12-0.019H 8.97-0.019H

SCU-W-Large-B ≥200 6.84 6.08 5.7 5.32 5.17

SCU-A-Small-B <110 16.72-0.0469H 15.43-0.0469H 14.15-0.0469H 14.15-0.0469H 13.76-0.0469H

SCU-A-Large-B ≥110 and 

<200 14.91-0.03044H 13.24-0.02700H 10.99-0.01822H 11.47-0.02256H 10.6-0.01822H

SCU-A-Extended-B ≥200 8.82 7.84 7.35 6.96 6.96

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Table 4: Equations Representing the TSLs for Continuous Equipment Classes (Maximum Energy Use in kWh/100 lb Ice)

Continuous Equipment 

Class

Capacity 

Range (lb/day) TSL 1 TSL 2 TSL 3 TSL 4 TSL 5

IMH-W-Small-C <900 7.59-0.00333H 7.59-0.00333H 7.34-0.00333H 7.34-0.00333H 6.93-0.00333H

IMH-W-Large-C ≥900 4.59 4.59 4.34 4.34 3.93

IMH-A-Small-C <310 10.1-0.00629H 10.1-0.0629H 9.64-0.00629H 9.19-0.00629H 8.38-0.00629H

IMH-A-Large-C ≥310 and <820 9.49-0.00433H 9.49-0.00433H 8.96-0.00408H 8.23-0.0032H 7.25-0.00265H

IMH-A-Extended-C ≥820 5.94 5.94 5.61 5.61 5.08

RCU-NRC-Small-C <800 9.85-0.00519H 9.78-0.00550H 9.7-0.0058H 9.7-0.0058H 9.26-0.0058H

RCU-NRC-Large-C ≥800 5.7 5.38 5.06 5.06 4.62

RCU-RC-Small-C <800 10.05-0.00519H 9.98-0.00550H 9.9-0.0058H 9.9-0.0058H 9.46-0.0058H

RCU-RC-Large-C ≥800 5.90 5.58 5.26 5.26 4.82

SCU-W-Small-C <900 8.55-0.0034H 8.08-0.00321H 7.6-0.00302H 7.6-0.00302H 6.84-0.00272H

SCU-W-Large-C ≥900 5.49 5.19 4.88 4.88 4.39

SCU-A-Small-C <200 15.26-0.03000H 14.73-0.03000H 14.22-0.03H 14.22-0.03H 13.4-0.03H

SCU-A-Large-C ≥200 and 700 10.66 -0.00702H 10.06-0.00663H 9.47-0.00624H 9.47-0.00624H 8.52-0.00562H

SCU-A-Extended-C ≥700 5.75 5.42 5.1 5.1 4.59

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