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Circulating Block Heater

Alfredo Gutierrez

Cal TF Work Paper Presentation

October 23, 2014

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AgendaObjective: Seeking TF approval of draft workpaper

• Measure Description

• Work Paper Methodology

• Results

• Issues and Concerns

• Questions or Comments

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Measure DescriptionMeasure Case

Circulating block heater• Integrated pump circulates heated

coolant through engine block• Leads to more uniform temperatures• Requires a smaller heating element

due to improved temperature mixing

Base CaseThermo siphon heater• Relies on temperature variation to

drive circulation which leads to non-uniform temperatures

• Generates waste heat• Only contains an electric resistance

heater

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Measure DescriptionUnits: Per unit

Measure Application and Delivery Type• Downstream Deemed (ER or ROB depending on existing equipment

age)

Eligibility• Climate zones: All• Building types: All Non-Residential

Target Market• Industrial sector• Commercial sector

Market Potential

Estimated at 300 installations in 2014 though SCE’s customized program by years end.

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Measure DescriptionMeasure Costs

• Baseline cost (material + labor): $750 – $1,500• Measure cost: $1,000 - $1,800• Incremental cost: $250 - $600

EUL

15 years (DEER EUL ID: Motors-pump)

Net-to-Gross

0.85 (DEER EUL ID: ET-Default)

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Work Paper MethodologyBaseline/Measure data collection

Baseline/Measure methodology

• kWh vs OA was collected, on average, for 2 months pre and post• Regression models were then created from site data• Average yearly temperature found for each climate zone

• 2013 CEC TMY2 weather files• Assumed 334 days of operation for the heater

• One month of downtime for maintenance

Bonneville Power Administration (BPA) Emerging Technology Case Studies• 17 Sites

• Waste Water Plants• Data Centers

• Parameters• Daily Average kWh• Outside Air (OA) Temperature• Duty Cycle

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Work Paper MethodologyBaseline Regression Model

Baseline Methodology

30 40 50 60 70 80 900

10

20

30

40

50

60

70

80

90

f(x) = − 1.35886548491878 x + 131.68406918157R² = 0.908525448576929

Daily Average kWh vs. OA

Avg kWh

Linear (Avg kWh)

Average OA Temperature (°F)

Dai

ly A

vera

ge k

Wh

h𝑘𝑊 =−1.3589∗𝑂𝐴+131.68

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Work Paper MethodologyMeasure Regression Model

Measure Methodology

25 30 35 40 45 50 55 60 65 700

10

20

30

40

50

60

70

80

f(x) = − 1.09166063421547 x + 98.4572095098951R² = 0.830772566983951

Daily Average kWh vs. OA

Avg kWh

Linear (Avg kWh)

Average OA Temperature (°F)

Dai

ly A

vera

ge k

Wh

h𝑘𝑊 =−1.0917∗𝑂𝐴+98.457

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Work Paper MethodologyYearly Average Temperature

Sensitivity Analysis• Bin Method

– Used to find the savings associated with a daily average temperature instead of yearly average temperature

• Savings found and compared between daily and yearly average temperatures for climate zone 6 and 15

Climate Zone Average Yearly Dry Bulb Temperature (°F)

6 61.5

8 63.4

9 63.5

10 63.9

13 63.8

14 62.4

15 75.2

16 51.5

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ResultsSensitivity Analysis Results• Climate Zone 6

• Climate Zone 15

Measure Sensitivity Analysis

Savings (kWh)

Original Savings (kWh)

% Difference in Savings

37-199 kW Generator with Circulating Block Heater 1,610 1,618 0.50%

200-799 kW Generator with Circulating Block Heater 3,273 3,286 0.39%

800-1099 kW Generator with Circulating Block Heater 8,277 8,309 0.39%

1100-2500 kW Generator with Circulating Block Heater 12,198 12,636 3.46%

Measure Sensitivity Analysis

Savings (kWh)

Original Savings (kWh)

% Difference in Savings

37-199 kW Generator with Circulating Block Heater 1,818 1,830 0.65%

200-799 kW Generator with Circulating Block Heater 3,600 3,619 0.52%

800-1099 kW Generator with Circulating Block Heater 9,097 9,144 0.51%

1100-2500 kW Generator with Circulating Block Heater 23,411 24,054 2.67%

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ResultsTable of results

*Averages for all SCE climate zones are shown above.

Measure Average kWh Savings*

Average kW Reduction*

Average Therm Savings*

37-199 kW Generator with Circulating Block Heater 1,641 0.2063 0

200-799 kW Generator with Circulating Block Heater 3,321 0.4163 0

800-1099 kW Generator with Circulating Block Heater 8,398 1.0475 0

1100-2500 kW Generator with Circulating Block Heater 13,859 1.7300 0

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Issues and Concerns – Cal TF CommentsAbstract Review Comments from the Cal TF

Perform a sensitivity analysis• A bin analysis using daily average temperatures was performed for two

climate zones (6 & 15)• The savings from the bin analysis and the original methodology are

within 4% (and 1% for 3 of the 4 measures)

Verify if savings will be impacted by thermostatic controls• As SCE is still awaiting monitored data from customized projects, the

impact of thermostatic controls is not yet known. They will be verified as soon as data is received from custom projects installed within SCE territory.

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Equipment Cost• Preliminary costs were taken from one customer• With more customers, we will have a better set of data to establish

equipment/labor costs

SCE Specific Data• Currently, BPA data is used. This data source has been questioned

whether it is appropriate for SCE territory.• Data for 10 sites is scheduled to be provided by early December. The

work paper will then be updated with this new data.

Issues and Concerns – Future Updates

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Questions or Comments?