Milk Vat Insulation Case Studies

The following case studies show the refrigeration savings that can be achieved by insulating your milk vat.

The table uses actual input data from four different sized dairy farms, which Genesis Energy audited.

Farm Description Medium Medium Medium Large
Location Taranaki Huntly Taranaki Manawatu
Number of cows 170 340 400 1,000
Shed type Herring Bone Herring Bone Rotary Rotary
Milking days per year 290 290 290 290
Time for morning milk (minutes) 150 130 120 270
Time for evening milk (minutes) 120 110 100 210
         
Milk Chilling Inputs
Refrigerant R12 R134a R22 R22
Milk vat size (litres) 3,400 9,100 11,500 30,000
Milk vat inside or out Inside Inside Inside/Outside Outside
Is there a milk pre-cooler Yes Yes Yes Yes
Milk temperature going into vat (usually after the pre-cooler)°C 18 20 14 18
Is the milk chilled by an ice bank or chilled water system No No Yes No
Target vat milk temperature °C 4 4 4 4
Volume of milk per cow (average) per day (Litres) 18 19 22 20
         
Milk Cooling Requirements
Electricity used to cool milk (kWh) 4,133 12,237 10,419 34,479
Electricity cost to cool milk ($) $709 $1,814 $1,657 $2,931
         
Thermo Wrap™- Dairy Technology Services Ltd
Installed cost $912 $1,274 $1,277 $1,718
Reduction in cost per year $121 $320 $258 $498
Simple payback (years) 7.6 4 4.9 3.4
Electricity Usage Savings (%) 17% 17% 11% 17%
         
Polar Wrap™ Dairy Technology Services Ltd
Installed cost $1,403 $2,462 $2,506 $3,168
Reduction in cost per year $135 $345 $215 $615
Simple payback (years) 10.4 7.1 11.6 5.1
Electricity Usage Savings (%) 19% 19% 13% 17%

It is important to note that some savings are based on theoretical calculations and others have been from trials performed by Genesis Energy. Please contact the product supplier to compare products, validate your savings estimate and obtain a firm quote.

To estimate your own milk vat insulation energy savings, just complete the milk chilling section of the Dairy Efficiency Calculator.