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CO2 heat pump for waste heat recovery and utilization in dairy industry with ammonia based refrigeration.

Author(s) : SINGH S., DASGUPTA M. S.

Type of article: Article, IJR article, Case study

Summary

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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Pages: 108-120

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Details

  • Original title: CO2 heat pump for waste heat recovery and utilization in dairy industry with ammonia based refrigeration.
  • Record ID : 30021564
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 78
  • Publication date: 2017/06
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2017.03.009

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