Dairy industry

Milk in contrasting temperature cycles

                                                                                          Photo: bbc.co.uk

Robert Wiseman dairy in Manchester needed urgent investments to continue to be profitable. The company had to change the old R22 refrigerant with an environmental friendly one, and the solution proposed by GEA Refrigeration has proven to be exactly what they needed.

What was implemented

                                                                            Photo: atmo.org

Even though the new ammonia refrigerant would have made the factory more efficient, the payback period was too long, therefore the company decided to add the heat pump suggested by GEA in the investment. This extracts the waste heat from the refrigeration system and uses it in the process of milk pasteurization.

The heat pump can use the warm 32oC air and provide hot water at a temperature of 80oC. A precisely calibrated valve mixes it with cooler water to obtain a temperature of 76oC, necessary for an optimal milk pasteurization. To cool down the milk, the factory uses "recycled" heat from the pumps, chiller, compressor, heat pumps and even from the employees in the factory.

Savings

  • CO2 emission reduction by 1100 t/year
  • reduced operating costs
  • payback period: 2 years
  • fresh water for the old gas boiler steam