Using Renewable Energy in Dairy Production. Brad Heins West Central Research and Outreach Center Morris, MN
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1 Using Renewable Energy in Dairy Production Brad Heins West Central Research and Outreach Center Morris, MN
2 WCROC Dairy Herds Organic herd 130 cows 40 lbs milk, 4.4% fat, 3.5% protein, 265 SCC Milk price: $36.94 /cwt. Conventional herd 140 cows 55 lbs milk, 4.2% fat, 3.4% protein, 236 SCC Milk price: $19.44/cwt. Dairy breeds Holstein, Jersey, Montbéliarde, Viking Red, Normande, 1964 Holstein 2012 Regents of the University of Minnesota. All rights reserved.
3 WCROC Existing Dairy Regents of the University of Minnesota. All rights reserved.
4 WCROC Existing Dairy WCROC Dairy milks about 200 cows twice/day Typical of a medium sized Minnesota dairy farm Average 12,000 lbs/day milk 7,500 lbs/day conventional 4,500 lbs/day organic Regents of the University of Minnesota. All rights reserved.
5 WCROC Existing Dairy Milking is energy intensive We use 110,000 kwh/yr; 440 kwh/cow/yr o 3.5 kwh/cwt milk (~12 gal) o 300 kwh/day $30/day We use 4500 therms/yr of nat. gas ; 21 therms/cow/yr o 14 therms per day for furnace and water heater $11/day We use 220,000 gal of hot H 2 O /yr; 900 gal/cow/yr o 600 gallons of hot H 2 O/day 2.5 gpd hot H 2 O (6 gpd total)/cow o Does NOT include drinking water o Hot water heated to >160 F to sanitize lines Regents of the University of Minnesota. All rights reserved.
6 Dairy Energy Monitoring Data logger collects and stores data Monitors every 10 seconds, calculates average and stores data every 10 minutes 11 water temp and flow sensors 4 air temp sensors 20 electric current sensors 2.4 million data points per year 2011 Regents of the University of Minnesota. All rights reserved. 6
7 WCROC Dairy Status 2200 gal thermal storage tank designed & built Regents of the University of Minnesota. All rights reserved.
8 Dairy project objectives Conduct baseline energy audits of dairy facilities Develop and evaluate energyoptimized system for conventional and alternative production systems Conduct life cycle assessment in dairy production systems 2012 Regents of the University of Minnesota. All rights reserved.
9 2012 Regents of the University of Minnesota. All rights reserved.
10 Systems Approach to Net Zero Look at entire process to assess resources & loads Loads: Milk harvest Milk cooling Water heating Cleaning Parlor Rags Milk lines Ventilation (cooling) Lights Parlor heat Misc. electric loads Resources: Heat in milk Heat in parlor Heat in lagoon Heat in Earth Sunlight Wind Storage? Heat Pump 2012 Regents of the University of Minnesota. All rights reserved.
11 Planned Dairy Energy Systems
12 Scroll vs. Reciprocating compressor Scroll compressor bulk tank Reciprocating compressor bulk tank 2012 Regents of the University of Minnesota. All rights reserved.
13 Scroll vs. Reciprocating compressor 2012 Regents of the University of Minnesota. All rights reserved.
14 VFD vacuum pump Vacuum motor = 7.5 hp VFD cost = $3,400 (5.6 kw) Savings = 38 kwh/day $3.80/day Pay back = 2.5 years 2012 Regents of the University of Minnesota. All rights reserved.
15 Daily dairy hot water usage 2012 Regents of the University of Minnesota. All rights reserved.
16 Monthly dairy water usage 2012 Regents of the University of Minnesota. All rights reserved.
17 Yearly dairy water usage 2012 Regents of the University of Minnesota. All rights reserved.
18 18
19 November 2014 dairy electricity usage kwh's/day Total Meas. Furnace Conv. Comp. Org. Comp. Vac. Pump Press. Washer Dryer Utility Fan Day 2012 Regents of the University of Minnesota. All rights reserved.
20 Yearly dairy electricity usage kwh's/day Total Electricity Comp. Recip Conv Comp. Scroll Org Vac. Pump Press. Washer Dryer Ventilation Heaters Regents of the University of Minnesota. All rights reserved.
21 Yearly dairy electricity usage kwh's/day Comp. Recip Conv Comp. Scroll Org Vac. Pump Press. Washer Dryer Ventilation Heaters Regents of the University of Minnesota. All rights reserved.
22 22
23 23
24 24
25 2016 Dairy Electricity Usage (300 kwh/day Total) Pressure Washer 1% Office 1% Misc. 15% Milk Cooling 26% Washer/Dryer 9% Heaters 16% Ventilation 15% Vacuum Pump 9% Lights 8% 25
26 26
27 2016 Dairy Hot Water Usage (~510 gal/day Total) Bathroom 4% Washing Machine 12% Parlor Cleaning 27% Sanitizing Equipment 57% 27
28 2016 January Hot Water Usage (~520 gal/day Total) Washing Machine 12% Bathroom 4% Parlor Cleaning 25% 2016 July Hot Water Usage (~420 gal/day Total) Washing Machine 15% Bathroom 5% Parlor Cleaning 12% Sanitizing Equipment 59% Sanitizing Equipment 68% 28
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30 Parlor Electricity & Milk Production Milk Production (lbs/day) Average Daily Energy (kwh/day) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 Milk Production Total Electricity 30
31 2015 Dairy Production Milk Production Cows Total (lbs) Total (gal) Average (lbs/day) Average (gal/day) Conventional 115 2,008, , Organic 104 1,113, , Total 219 3,121, , Energy Usage Total Average/cow/day Average/gal milk Natural Gas (MJ) 526, Electricity (kwh) 105, Total Water (gal) 519,
32 Electricity usage January/May kwh/cow.58 kwh/lb fat and protein (Org).42 kwh/lb fat and protein (Conv) 1.05 kwh/cow.52 kwh/lb fat and protein (Org).35 kwh/lb fat and protein (Conv) 2012 Regents of the University of Minnesota. All rights reserved.
33 Water usage January/May January Hot Water Usage (349 gal/day Total) 2015 May Hot Water Usage (362 gal/day Total) Bathroom 5% Parlor 12% Bathroom 6% Parlor 13% Washing Machine 17% Milk Lines 48% Washing Machine 17% Milk Lines 44% Milk Tanks 18% Milk Tanks 20% 1.62 gal/cow 1.05 gal/cow 2012 Regents of the University of Minnesota. All rights reserved.
34 WCROC Milking Parlor Natural Gas Usage 1000 Average Monthly Usage (therms) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2012 Regents of the University of Minnesota. All rights reserved.
35 WCROC Milking Parlor Electricity Usage Average Daily Usage (kwh) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2012 Regents of the University of Minnesota. All rights reserved.
36 Dairy Production LCA Boundaries Joel Tallaksen,
37 Heins and Tallaksen,
38 Heins and Tallaksen,
39 Greening Dairy Energy Usage Renewable energy options Solar Thermal collectors to pre-heat water Solar PV panels for electricity Small wind turbine for electricity Large, insulated tank for thermal energy storage Heat pump to convert extra electricity into hot water (COP =2.5 in MN) Innovative control system Manages sources and delivery Regents of the University of Minnesota. All rights reserved.
40 Systems Approach to Net Zero Make electric loads as efficient as possible or practical VFD drives, LED lights, scroll compressors, etc. Watch for waste and quick fixes that become permanent Convert all thermal loads to electricity Heat pumps Add renewable energy systems and storage to meet demand 2011 Regents of the University of Minnesota. All rights reserved. 40
41 Future Dairy Energy Research We will evaluate the shade potential of solar systems for pastured-cattle Monitor energy and water usage on Minnesota dairies Field test electric vehicles for pasture dairy use Install Smart Level II charging station with Tesla batteries at the WCROC Preliminary funding approved by LCCMR for July 1, Regents of the University of Minnesota. All rights reserved.
42 2012 Regents of the University of Minnesota. All rights reserved. Preliminary funding approved by LCCMR for July 1, 2017
43 Brad Heins
Using Renewable Energy in Dairy Production. Brad Heins West Central Research and Outreach Center Morris, MN
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