CO2 heat pump for waste heat recovery and utilization in dairy industry with ammonia based refrigeration |
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Affiliation: | 1. RefrigLab Limited, Auckland, New Zealand;2. Fonterra Research Centre, Palmerston North 4472, New Zealand;3. Massey University, Private Bag 11-222, Palmerston North 4420, New Zealand |
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Abstract: | Based on field data from a medium scale ammonia based milk refrigeration plant located in northern India, a trans-critical CO2 heat pump system with IHX is conceptualized for waste heat utilization. The waste heat is utilized to pre-heating the boiler feed water and thereby reduces energy consumption. A thermodynamic model of the refrigeration system is built and simulated for year-round field data. In this study, the condenser of the ammonia based refrigeration system is coupled with the evaporator of the proposed CO2 heat pump which is maintained at 20 °C year-round. The heat pump delivers heat at about 70 °C to pre-heat the boiler feed water drawn from underground source and is available in temperature range of 25 °C to 29 °C year-round. Thus, the CO2 heat pump performance is essentially independent of variation in ambient temperature. We reported reduction in CO2 emission and reduction in total energy cost by approximately 45.7% and 33.8% respectively. Economic analysis shows the payback period (PBP) is about 40 months. |
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