Performance of high temperature heat pump for simultaneous and efficient production of ice water and process heat

摘要

Industrial processes like milk production often require simultaneous cooling and heating at temperatureof 1 °C to 10 °C and 90 °C to 120 °C, respectively. High temperature heat pumps (HTHP) with naturalworking 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 kWthpilot plant. The test campaign covers an evaporation temperature range of -1 °C to +1 °C and acondenser temperature range of 113 °C to 118 °C enabling ice-water chilling from 10 °C to 4 °C and ahot-water heating from 85 °C to 116 °CA Combined heating and cooling COPcombined of 2.6 to 2.8 was achieved for a temperature lift of110 K to 80 K, respectively. This performance gives a primary energy saving potential of 57% and apotential CO_2-emission reduction of 94%.It can be concluded that HTHP can produce simultaneously chilled/ice-water and hot-process waterefficiently for processes like drying, sterilization, pasteurization.