Performance of high temperature heat pump for simultaneous and efficient production of ice water and process heat
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Industrial processes like milk production often require simultaneous cooling and heating at temperature of 1 °C to 10 °C and 90 °C to 120 °C, respectively. High temperature heat pumps (HTHP) with natural working fluids are a cost-, energy efficient and sustainable solution. In this work a 20 kWth lab scale cascade heat pump is analysed to predict the performance of a 300 kWth pilot plant. The test campaign covers an evaporation temperature range of -1 °C to +1 °C and a condenser temperature range of 113 °C to 118 °C enabling ice-water chilling from 10 °C to 4 °C and a hot-water heating from 85 °C to 116 °C A Combined heating and cooling COPcombined of 2.6 to 2.8 was achieved for a temperature lift of 110 K to 80 K, respectively. This performance gives a primary energy saving potential of 57% and a potential CO2-emission reduction of 94%. It can be concluded that HTHP can produce simultaneously chilled/ice-water and hot-process water efficiently for processes like drying, sterilization, pasteurization.