Analysis - E3 in Montana Agriculturee3.peakstoprairies.org/wp-content/uploads/Sample-Farm_Ag... ·...

Sample FarmAgriculture Energy Management Plan,

Headquarters

Prepared For:Sample FarmerFarmer Address

Somewhere, ID 83440Phone: (208) 111-1111

Total Plan Acreage = 1,325

Prepared By:

Rick Rumsey, P.E.Rumsey Engineering534 Trejo, Ste. 200Rexburg, ID 83440

Phone: (208) 221-5138

To the best of my knowledge this report meets all USDA-NRCS and ASAE S612 requirements for an Agriculture Energy Management Plan, Headquarters and I certify that I have the technical expertise and experience to evaluate the energy alternatives presented in this plan.

Planner Signature Date

I have reviewed and accept this plan and the recommendations presented in this report.

Producer Date

NRCS Representative Date

Table of Contents

1. Background and Site Information....................................................32. Summary of Recommendations.......................................................33. Baseline Equipment, Current Energy Usage Summary, and Potential Energy Savings.......................................................................4

3.1. Main Well & Booster Pump System...........................................43.2. West Well & Booster Pump System...........................................63.3. Barn Well Pump System.............................................................73.4. A Frame Potato Cellar................................................................93.5. Behlen Potato Cellar................................................................103.6. New Behlen Potato Cellar........................................................113.7. Other Major Activities..............................................................12

4. Appendices.....................................................................................134.1. Main Well & Booster Pump Energy Savings Calculations.......134.2. Barn Well Pump Energy Savings Calculations.........................144.3. A Frame Potato Cellar Energy Savings Calculations...............154.4. Behlen Potato Cellar Energy Savings Calculations.................164.5. Main Well Pump Curve – 8 Stages Full Trim...........................174.6. Main Booster Pump Curve – 2 Stages Full Trim......................184.7. Main Booster Pump Curve – 1 Stage Full Trim.......................194.8. West Well Pump Curve – 8 Stages Full Trim...........................204.9. West Well Pump Curve – 1 Stage Full Trim.............................214.10. West Booster Pump Curve....................................................224.11. Barn Well Pump Curve – 11 Stages Full Trim.......................234.12. Technical Documentation/References...................................24

Randy Hughes Agriculture Energy Management Plan of 26

1. Background and Site Information

The Sample farm is located near Somewhere, Idaho. The farm operation consists of about 1,325 acres of irrigated farm ground with crop rotations of potatoes and small grains. Typically, 35% of the farm is planted in potatoes and 65% is planted in grain. The irrigation system consists of nine full circle center pivots with a design flow rate of 900 gpm, two part circle center pivots with a design flow rate of 550 gpm, and hand lines on some of the pivot corners. There are three irrigation pump stations that irrigate the entire farm, the Main Well and Booster, the West Well and Booster, and the Barn Well. There are also three potato storage units with fan ventilation systems, the A Frame Cellar, the Behlen Cellar, and the New Behlen Cellar. Rocky Mountain Power is the electricity provider for all of the irrigation systems and potato storage units on this farm. Mr. Farmer is interested in reviewing the existing equipment and operation and identifying any potential energy savings opportunities that may exist. The baseline description and potential energy saving opportunities for each irrigation pump and potato storage unit are summarized in Section 3 below.

2. Summary of Recommendations

Table 1 below includes a summary of the recommended energy saving measures for this farm. Only those measures with a simple project payback of 10 years or less are included in the table.

Table 1. Summary of Estimated Annual Energy Efficiency Improvements

Estimated Reduction in Energy Use

Estimated Costs, Savings, Payback, and

Prioritization for Implementation

Environmental Benefits

Greenhouse Gases

Air Pollutant

Co-Benefits

Recommended Measure

Electric

Savings

(kWh)

Diesel Savings (Gal.)

Energy Saving

s (mBTU

)

Installed Cost

[a]

Energy Cost

Savings [b]

Payback in

Years[a/b]

Est. CO2(lbs)

Est.N2O(lbs)

Est.CH4(lbs)

Est.SO2(lbs)

Est.NOx(lbs)

Rebuild the Barn Pump 43,193 147.42 $17,000 $2,815 6.0 6,031.9

0 0.11 0.58 10.85 5.95

Totals 43,193

147.42

$17,000

$2,815 6.0 6,031.9

0 0.11 0.58 10.85 5.95

Table 2. Energy Savings of Recommendations

Fuel Current Usage MBtu Usage Savings MBtu Savings % Savings

Electricity (kWh) 395,200 1,348.82 43,193 147.42 11%


Totals 1,348.82 147.42 11%

3. Baseline Equipment, Current Energy Usage Summary, and Potential Energy Savings

3.1. Main Well & Booster Pump SystemThe main well pump is a 600 hp deep well turbine pump and the main well booster is a 200 hp turbine booster pump. Both of the pumps have electric motors. The well pump is an American Turbine 14-M-320 with 8 stages at full trim. The booster pump is a Verti-Line 14RHM with 2 stages of RM bowls at full trim and one stage of an RH bowl at full trim. The well pump motor is a 600 hp General Electric motor that operates at 1,770 rpm. The booster pump motor is a 200 hp General Electric motor that operates at 1,770 rpm. The existing pump operating conditions are presented below.

Main Well & Booster Pump Existing Operating Conditions

ScenarioFlow (gpm

)

Discharge

Pressure (psi)

Total Dynamic

Head (feet)

Estimated

PumpEff. (%)

Operating

Hours3 Pivots with

Discharge

Well Pump3,10

019 704 85 1,935

Booster3,10

092 175 69 1,935

An evaluation of one year of usage history for this system was analyzed for the season of 2012. The usage provided an understanding of seasonal kWh usage and kW demand, seasonal costs incurred, and hours of operation. A copy of the usage history is provided below.


Acct. Name: HUGHES FARMS INCAcct. #: 76632525-001-002

Meter # : 2372045Site ID: 609667924

Address: 3100 E 350 N SAINT ANTHONY ID 83445Descrip: 600 + 200 HP PUMPS_WELL #4

Read Date KW KWH InvoiceDecemberNovemberOctober 0 - 21.44$ September 720 111,520 11,137.71$ August 731 377,440 26,799.13$ July 726 468,160 31,424.44$ June 731 290,240 22,187.24$ May 731 161,120 11,856.45$ AprilMarchFebruaryJanuaryTotals 1,408,480 103,426.41$ Average 728

Ave. kWh 1,408,480 Ave. kW 728

Hours 1,935 Ave. Cost 103,426.41$

2012

Based on the 2012 usage history for this pump the average demand is 728 kW/month, the average energy usage is 1,408,480 kWh/year, the average annual operating hours are 1,935 hours/year, and the average cost is $103,426/year. The baseline for this system is the existing system.

A spreadsheet calculation sheet was prepared to estimate the energy savings by installing variable frequency drives (VFDs) on the Main Well & Booster. The proposed operating conditions are summarized below.


Proposed Operating Conditions

ScenarioFlow (gpm

)

Discharge

Pressure (psi)

Total Dynamic

Head (feet)

Estimated

PumpEff. (%)

Operating

Hours3 Pivots + Corners

Well Pump 3,000

10 683 85 387

Booster 3,000

85 180 73 387

3 PivotsWell Pump 2,70

010 683 82 1,548

Booster 2,700

85 180 77 1,548

Key Assumptions/Notes The existing pump motor efficiencies were assumed to be 92%. The well VFD will be set to maintain 10 psi at the pump and the

booster VFD will be set to maintain 85 psi at the pump.

The total estimated energy savings for installing VFDs on the 600 hp deep well and the 200 hp turbine booster pumps are 117,846 kWh/yr. The current cost of energy for this system is $0.0501/kWh and $5.42/kW resulting in approximately a $5,903 cost savings/yr for this project. The total estimated project cost for both VFDs is about $105,000 based on similar projects. The simple project payback for this project is estimated to be 17.8 years. There may also be incentives available through Rocky Mountain Power for this project that would decrease the overall project cost and the project payback. The calculation spreadsheet is included in the Appendix.

3.2. West Well & Booster Pump SystemThe West Well pump is a 500 hp deep well turbine pump and the West Well Booster is a 200 hp turbine booster. Both of the pumps have electric motors. The well pump is a Verti-Line pump with 8 stages of 14RM bowls and 1 stage of a 14RL bowl, all at full trim. The booster pump is a Verti-Line 14RM with 3 stages at full trim. The existing operating conditions are summarized below.

West Well & Booster Pump Existing Operating Conditions

ScenarioFlow (gpm

)

Discharge

Pressure (psi)

Total Dynamic

Head (feet)

Estimated

PumpEff. (%)

Operating

Hours


Well2,20

015 765 84 877

Booster2,20

097 190 83 877



Meter # : 35798410Site ID: 609115017

Address: 3050 E 375 N NEWDALE ID 83436Descrip: 500 + 200 HP + PIVOTS

Read Date KW KWH InvoiceDecemberNovemberOctober 6 360 47.57$ September 15 1,560 237.07$ August 511 75,240 8,188.89$ July 518 331,920 23,622.05$ June 520 41,760 4,898.58$ May 20 1,920 152.73$ AprilMarchFebruaryJanuaryTotals 452,760 37,146.89$ Average 516

Ave. kWh 452,760 Ave. kW 516

Hours 877 Ave. Cost 37,146.89$

2012

Based on the usage history for this pump the average demand is 516 kW/month, the average energy usage is 452,760 kWh/year, the average annual operating hours are 877 hours/year, and the average cost is $37,147/year. The baseline for this system is the existing system.

Based on the pump curves, usage history, and estimated operating conditions the pumps appear to be operating at a reasonable efficiency. No potential energy saving opportunities are identified for this system at this time.


3.3. Barn Well Pump SystemThe Barn Well pump is a 350 hp turbine pump with an electric motor that pumps from an irrigation well. The pump is an American Turbine 12-M-100 with 11 stages at full trim. The existing operating conditions are summarized below.

Barn Well Pump Existing Operating Conditions

ScenarioFlow (gpm

)

Discharge

Pressure (psi)

Total Dynamic

Head (feet)

Estimated

PumpEff. (%)

Operating

HoursExisting Pump 900 65 775 70 1,854



Meter # : 36005760Site ID: 608838410

Address: 2900 E 420 N NEWDALE ID 83436Descrip: 450 HP PUMP_WELL #2

Read Date KW KWH InvoiceDecemberNovemberOctober 199 13,680 1,014.18$ September 214 48,360 4,648.04$ August 212 104,920 8,467.75$ July 211 128,120 10,034.16$ June 222 86,280 6,969.55$ May 221 13,840 1,029.04$ AprilMarchFebruaryJanuaryTotals 395,200 32,162.72$ Average 213

Ave. kWh 395,200 Ave. kW 213

Hours 1,854 Ave. Cost 32,162.72$

2012


Based on the usage history for this pump the average demand is 213 kW/month, the average energy usage is 395,200 kWh/year, the average annual operating hours are 1,854 hours/year, and the average cost is $32,163/year. The baseline for this system is the existing system.

A spreadsheet calculation sheet was prepared to estimate the energy savings by rebuilding the 350 hp well pump. The analysis for the proposed operating conditions is based on the pump curve. The proposed operating conditions are summarized below.

Proposed Operating Conditions

ScenarioFlow (gpm

)

Discharge

Pressure (psi)

Total Dynamic

Head (feet)

Estimated

PumpEff. (%)

Operating

HoursRebuilt Pump 900 82 814 83 1,854

Key Assumptions/Notes The existing pump motor efficiency was assumed to be 92%. The pump efficiency for the rebuilt pump will be at least 83%. The rebuilt pump efficiency was taken from the pump curve and

reduced by 3% for the analysis.

The total estimated energy savings for rebuilding the 350 hp well pump are 43,193 kWh/yr and 23 kW/month. The current cost of energy for this system is $0.0501/kWh and $5.42/kW resulting in approximately a $2,815 cost savings/yr for this project. The total estimated project cost for rebuilding the pump is about $17,000 based on similar projects. The simple project payback for this project is estimated to be 6.0 years. There may also be incentives available through Rocky Mountain Power for this project that would decrease the overall project cost and the project payback. The calculation spreadsheet is included in the Appendix.

3.4. A Frame Potato CellarThe A Frame Potato Cellar has the capacity to hold 85,000 hundred weight sacks of potatoes. This cellar has a 20 hp fan with an electric motor that provides ventilation and cooling to the potatoes. The potato cellar is usually filled around the 1st of October and emptied around the 1st of July on average. After the potato cellar is filled it takes about 45 days on average to cool the potatoes to the desired storage temperature. During cool down the fan operates at full speed whenever outside air temperatures are low enough to provide cooling to the potatoes. It is estimated that the fan runs an average of 24


hours per day during cool down. After cool down, the fan typically operates 12 hours per day at full speed to maintain storage temperatures.

An evaluation of one year of usage history for this cellar was analyzed for the season of 2012. The usage provided an understanding of seasonal kWh usage and seasonal costs incurred. A copy of the usage history is provided below.

Acct. Name: RANDY HUGHES Acct. #: 63112316-004-001

Meter # :Site ID:

Address: 2240 HUGHES SAINT ANTHONY ID 83445 Descrip: Commercial

Read Date KW Usg KWH Usg Invoice Amt12/20/2012 23 7467 $59011/19/2012 27 10115 $76710/18/2012 44 9191 $1,0009/19/2012 9 1465 $2168/20/2012 11 1468 $2447/19/2012 21 1449 $3836/19/2012 23 3715 $5025/18/2012 22 5141 $5264/19/2012 24 6933 $5883/21/2012 25 7494 $6222/21/2012 25 7287 $6131/23/2012 25 10051 $702

Total 71,776 $6,753

1369513412198156

A spreadsheet calculation sheet was prepared to evaluate the potential energy saving opportunities by installing a VFD on the ventilation fan motor. The total estimated energy savings by installing a VFD on the A Frame fan are 3,900 kWh/yr. The current cost of energy for this system is $0.0419/kWh and $12.35/kW resulting in a cost savings of about $163/yr for this project. The total estimated project cost for the VFD and associated equipment is $10,000 based on similar projects. The simple project payback for installing VFD on the fan would be about 61.3 years. The energy savings potential with a VFD is limited on this potato cellar due to the limited airflow capacity of the system. It is not recommended that a VFD be installed on this fan. The calculation spreadsheet is included in the Appendix.

3.5. Behlen Potato CellarThe Behlen Potato Cellar has the capacity to hold 95,000 hundred weight sacks of potatoes. The Behlen Cellar has two 10 hp fans with electric motors that provide ventilation and cooling to the potatoes. Randy Hughes Agriculture Energy Management Plan of 26

The potato cellar is usually filled around the 1st of October and emptied around the 1st of August on average. After the potato cellar is filled it takes about 45 days on average to cool the potatoes to the desired storage temperature. During cool down the fans operate at full speed whenever outside air temperatures are low enough to provide cooling to the potatoes. It is estimated that the fans run about 24 hours per day on average during cool down. After cool down, the fans typically operate 12 hours per day at full speed to maintain storage temperatures.



Meter # : 2367143Site ID:

Address: 11608 HUGHES SAINT ANTHONY ID 83445 Descrip: Commercial

Read Date KW Usg KWH Usg Invoice Amt12/20/2012 22 7,640 $58611/19/2012 24 11,920 $80310/18/2012 51 11,080 $1,1709/19/2012 20 1,160 $3538/20/2012 3 1,320 $1297/19/2012 72 2,800 $1,1386/19/2012 72 16,440 $1,6915/18/2012 80 5,360 $1,2784/19/2012 20 6,880 $5413/21/2012 20 7,120 $5502/21/2012 21 6,360 $5311/23/2012 23 8,520 $620

Total 86,600 $9,390

521157368

A spreadsheet calculation sheet was prepared to evaluate the potential energy saving opportunities by installing VFDs on the ventilation fan motors. The total estimated energy savings by installing VFDs on the Behlen fans are 14,469 kWh/yr. The current cost of energy for this system is $0.0419/kWh and $12.35/kW resulting in a cost savings of about $606/yr for this project. The total estimated project cost for the VFDs and associated equipment is $12,000 based on similar projects. The simple project payback for installing VFDs on the fans would be about 19.8 years. It is recommended that an actual project cost estimate be obtained and compared to the expected energy savings before an implementation


decision is made. The calculation spreadsheet is included in the Appendix.

3.6. New Behlen Potato CellarThe New Behlen Potato Cellar has the capacity to hold 50,000 hundred weight sacks of potatoes. This cellar has a 15 hp fan with an electric motor that provides ventilation and cooling to the potatoes. There is an existing VFD controller on the fan motor that allows the fan to operate at reduced speeds to maintain potato temperatures during the storage period. The potato cellar is usually filled around the 1st of October and emptied around the 1st of May on average. After the potato cellar is filled it takes about 45 days on average to cool the potatoes to the desired storage temperature. During cool down the fan operates at full speed whenever outside air temperatures are low enough to provide cooling to the potatoes. After cool down, the fan typically operates 24 hours per day at reduced speeds to maintain storage temperatures.



Meter # : 50572966Site ID:

Address: 350 N 3100 E SAINT ANTHONY ID 83445 Descrip: Commercial

Read Date KW Usg KWH Usg Invoice Amt12/20/2012 17 6,120 $51911/19/2012 15 10,640 $93910/18/2012 31 7,120 $6809/19/2012 1 400 $528/20/2012 4 0 $157/19/2012 1 0 $156/19/2012 5 1,360 $1445/18/2012 5 360 $484/19/2012 1 440 $523/21/2012 1 480 $552/21/2012 18 840 $851/23/2012 18 2,040 $179

Total 29,800 $2,783

566934583

No potential energy saving opportunities were identified for the New Behlen Potato Cellar at this time.


3.7. Other Major ActivitiesOther major activities that are not applicable to this farm and were not evaluated as a part of this plan include other motors (i.e. compressors), crop drying, water management (wells, reservoirs, etc.), and material handling. These components either are not used or are not major energy users on this farm.


4. Appendices

4.1. Main Well & Booster Pump Energy Savings Calculations

Variable Frequency Drive (VFD) Potential SavingsMain Well

Pump Performance from Curve Average Historical Energy Usage 1,408,480 kWh/yearFlow Head Efficiency Average Historical Energy Demand 728 kWgpm feet % Average Operating Hours 1,935 Hours

600 hp Well PumpAmerican Turbine 14-M-320, 8 stages, full trim

3,100 704 85% Estimated Total Dynamic Head (TDH)2,700 768 82% Well Booster

200 hp Booster - Verti-line 14RHM, 3 stage Lift 620 -23.1 feet3,100 175 69% Column Loss 35 5 feet2,700 232 77% Misc. 5 2 feet

Discharge 10 85 psiEstimated Motor Efficiency 92% Total TDH 683 180 feet

Adjusted Baseline Energy UsageAverage

% of Operating Est. Flow TDH Pressure Pump Motor Demand Usage VolumeScenario Time Hours gpm Feet psi Efficiency HPe kW kWh Acre-Feet

3 Pivots with DischargeWell Pump 100% 1,935 3,100 704 19 85% 704.7 525.7 1,017,442 1,104.8

Booster 100% 1,935 3,100 175 92 69% 215.8 161.0 311,5621,329,005 1,104.8

Estimated Usage with Variable Frequency DrivesAverage

% of Operating Est. Flow TDH Pressure Pump VFD Overall Demand Usage VolumeScenario Time Hours gpm Feet psi Efficiency Efficiency HPe kW kWh Acre-Feet

3 Pivots + CornersWell Pump 20% 387 3,000 683 10 85% 96% 689.2 514.2 199,011 213.8

Booster 20% 387 3,000 180 85 73% 96% 211.5 157.8 61,0693 Pivots

Well Pump 80% 1,548 2,700 683 10 82% 96% 643.0 479.7 742,649 769.8 Booster 80% 1,548 2,700 180 85 77% 96% 180.5 134.6 208,429

. 1,211,159 983.7

Energy Savings 117,846 kWh

Assumptions/Notes:Flow rates are based on pivot package and hand line information as provided by the owner.There are multiple pumps on this system.New bowls were installed in the well pump in 2011.A discharge valve currently controls the system pressures and discharges most of the time according to the owner.Hours of operation are based on the usage history.Pump efficiencies were taken from the pump curves.VFDs will be installed on the well pump and booster pump.The VFDs will be set to maintain a pressure of 85 psi at the pumps.Pump flows will vary, the analysis represents average flow conditions under normal operation.


4.2. Barn Well Pump Energy Savings Calculations

Pump Upgrade Potential Savings

Pump - American Turbine 12-M-100, 11 Stage Full Trim Average Historical Energy Usage 395,200 kWh/yearPump Performance from Curve Average Historical Energy Demand 213 kW

Flow Head Efficiency Average Operating Hours 1,854 Hoursgpm feet %900 814 86%

Estimated Total Dynamic Head (TDH)Lift 590 feet

Column Loss 20 feetMisc. 15 feet

Discharge 65 psiEstimated Motor Efficiency 92% Total TDH 775 feet

Adjusted Baseline Energy UsageAverage

% of Operating Est. Flow TDH Pressure Pump Overall Demand Usage VolumeScenario Time Hours gpm Feet Psi Efficiency HPe kW kWh Acre-Feet

Existing Pump 100% 1,854 900 775 65 70% 273.5 204.0 378,268 307.28

Estimated Usage With a Rebuilt PumpAverage

% of Operating Est. Flow TDH Pressure Pump Overall Demand Usage VolumeScenario Time Hours gpm Feet Psi Efficiency HPe kW kWh Acre-Feet

Rebuilt Pump 100% 1,854 900 814 82 83% 242.3 180.7 335,075 307.28 .

Energy Savings 43,193 kWhAssumptions/Notes: Demand Savings 23.3 kWBaseline flow rates and TDH are provided by owner.Baseline pump efficiency was adjusted to approximate historic demand.Hours of operation are based on the usage history.Rebuilt pump efficiency was taken from the pump curve and decreased by 3%.


4.3. A Frame Potato Cellar Energy Savings Calculations

Potato Storage Fan Variable Frequency Drive (VFD) Potential Savings

Inputs:# of Fans: 1

Motor Power: 20 hp/eachMotor Efficiency: 87.5%

Load Factor: 82%Motor Peak kW: 14.0 kW/each

Fan Output: 45,433 cfm/eachVFD Eff. @ 100%: 96%VFD Eff. @ 70%: 85%

Cool Winter SummerDown Storage Mode Total

Start Date 1-Oct 15-Nov 15-AprEnd Date 15-Nov 15-Apr 1-Jul

Baseline Operating Hours 1,080 1,812 616 3,508% of Total 31 52 18

Proposed Hours with a VFD 1,080 3,624 616 5,320% of Total 20 68 12

Estimated Baseline Energy UsageFan

Operating Operating Fan Speed Output Overall Demand Usage VolumeScenario Time (%) Hours (%) (cfm) HPe kW kWh million cf

Full Speed 100% 3,508 100 45,433 18.7 14.0 49,049 9,563Total 49,049 9,563

Estimated Usage With a Variable Frequency DriveFan


Full Speed 32% 1,696 100 45,433 19.5 14.6 24,702 4,623Reduced Speed 68% 3,624 70 31,803 7.6 5.6 20,447 6,915

Total 45,149 11,539


Assumptions/Notes:Motor load factor is based on field measurements.The system will operate 24 hours/day at full speed from Oct. 1 to Nov. 15 on average during cool down.The system without a VFD would operate an average of 12 hours/day at full speed from Nov. 15 to Apr. 15.The system will operate an average of 8 hours/day at full speed from Apr. 15 to July 1.Hours of operation are based on average operating conditions and potato storage dates provided by the owner.Hours of operation with a VFD on the fan are based on continous operation during the winter storage period.The minimum speed setting for the fans is 66% of full load speed.It is estimated that the average operating speed during the winter months will be 70% of full load speed.Minimum fan speed is based on providing a minimum airflow of 7 cfm/ton.VFD efficiencies are based on post installation inspections for other systems.

Average Fan Operation Time


4.4. Behlen Potato Cellar Energy Savings Calculations

Potato Storage Fan Variable Frequency Drive (VFD) Potential Savings

Inputs:# of Fans: 2

Motor Power: 10 hp/eachMotor Efficiency: 87.5%

Load Factor: 91%Motor Peak kW: 7.7 kW/each

Fan Output: 31,611 cfm/eachVFD Eff. @ 100%: 96%VFD Eff. @ 55%: 76%

Cool Winter SummerDown Storage Mode Total

Start Date 1-Oct 15-Nov 15-AprEnd Date 15-Nov 15-Apr 1-Aug

Baseline Operating Hours 1,080 1,812 864 3,756% of Total 29 48 23

Proposed Hours with a VFD 1,080 3,624 864 5,568% of Total 19 65 16

Estimated Baseline Energy UsageFan


Full Speed 100% 3,756 100 63,222 20.7 15.4 57,961 14,248Total 57,961 14,248

Estimated Usage With a Variable Frequency DriveFan


Full Speed 35% 1,944 100 63,222 21.5 16.1 31,249 7,374Reduced Speed 65% 3,624 55 34,772 4.5 3.4 12,243 7,561

Total 43,491 14,935


Assumptions/Notes:Motor load factor is based on field measurements.The system will operate 24 hours/day at full speed from Oct. 15 to Nov. 15 on average during cool down.The system without a VFD would operate an average of 12 hours/day at full speed from Nov. 15 to Apr. 15.The system will operate an average of 8 hours/day at full speed from Apr. 15 to Aug. 1.Hours of operation are based on average operating conditions and potato storage dates provided by the owner.Hours of operation with a VFD on the fan are based on continuous operation during the winter storage period.The minimum speed setting for the fans will be 53% of full load speed.It is estimated that the average operating speed during the winter months will be 55% of full load speed.The minimum speed setting is based on supplying a minimum air flow of 7 cfm/ton to the potatoes.VFD efficiencies are based on post installation inspection measurements for similar systems.

Average Fan Operation Time


4.5. Main Well Pump Curve – 8 Stages Full Trim


4.6. Main Booster Pump Curve – 2 Stages Full Trim


4.7. Main Booster Pump Curve – 1 Stage Full Trim


4.8. West Well Pump Curve – 8 Stages Full Trim


4.9. West Well Pump Curve – 1 Stage Full Trim


4.10. West Booster Pump Curve


4.11. Barn Well Pump Curve – 11 Stages Full Trim


4.12. Technical Documentation/References

Comet Quick Energy Calculator Tool


Analysis - E3 in Montana Agriculturee3.peakstoprairies.org/wp-content/uploads/Sample-Farm_Ag... ·...

Documents

Transcript of Analysis - E3 in Montana Agriculturee3.peakstoprairies.org/wp-content/uploads/Sample-Farm_Ag... ·...