Heat recovery systems

Take wasted heat from your refrigeration system and convert it into hot water.

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.

Mahana Blue Heat Recovery System

Dairycool Ltd supply the Mahana Blue heat recovery system that can heat water to 85°C, reducing the electric heating cost by a whopping 60%.

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.

How it works

The Mahana Blue system is effectively an inverter heat pump design that takes up to 70% of the heat from the discharge vapour of a milk silo refrigeration unit, piping it through a cascade heat exchanger to drive the Mahana heat pump, which when connected to the cold water feed of the shed hot water cylinders produces hot water up to 85°C, with no reduction in refrigeration capacity of the silo units.

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).


How it works

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.

Get the most efficient and economical compliance options for your farm