In a typical dairy shed, water heating is a significant expense to dairy operations. As large quantities of hot water are required each day to clean the milk silos and milking lines, up to 1000L per day, the cost over a season to heat water from 20°C to 85°C quickly adds up to thousands of dollars every year.
Heat recovery systems take otherwise wasted heat from refrigeration systems and convert it to hot water at a significantly reduced cost.
There are number of options that can be used in combination to reduce running costs while maintaining refrigeration capacity.
The Mahana Blue system is a self contained water heater and is mounted on a folded 3mm panel steel plate with dimensions 450mmx 800mm.The unit can be supplied with four optional legs 500mm long and an optional sheet metal weather protection cowl.
This system is recommended for farms milking 500 cows or more, and provides the highest return on investment for larger farms of 800+ cows.
A desuperheater is the most effective option recommended for farms milking 500 or less cows, or where secondary cooling is a consideration and the milk silo units are providing maintenance refrigeration only (milk is at storage temperature entering the silo).
A desuperheater mounted to a snap chilling unit or dx unit works by passing cold water and hot refrigerant vapour through a heat exchanger, typically preheating water to 40 to 45 degrees, before it is fed into the shed hot water cylinders for further heating to 85%.
Data indicates savings up to 30% on hot water heating costs by installing a desuperheater.