as well as in tanks. The condensing unit is mounted on a wall, Figure 1.14.
The evaporator is located at the lower end of the immersion unit.
The immersion cooler can also be used for indirect cooling, i.e. for
cooling water in insulated basins. The milk is then cooled in transport
churns immersed in the chilled water.
Insulated farm tanks for immersion coolers are available in both
stationary and mobile types (Figure 1.15). When road conditions prevent
access by tanker truck, a mobile tank can be used to bring the milk to a
suitable collection point. Mobile tanks are easy to transport and thus
suitable for milking in the fields.
Direct expansion tanks as shown in Figure 1.16 can as well be used for
cooling and storage of the milk.
Cleaning and sanitising
Manual cleaning with brushes is a common method where hand milking or
bucket machine milking systems are used.
Circulation cleaning is commonly performed in pipe line milking plants.
The cleaning solution is circulated through the plant by vacuum and/or a
pump.
Detergents, sanitisers, liquid temperatures and other cleaning conditions
recommended by the milking machine supplier should be applied.
Cooling of milk on the farm
Milk leaves the udder at a temperature of about 37 °C. Fresh milk from a
healthy cow is practically free from bacteria. It must be protected from