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Model-based analysis of the cleaning-in-place system in a dairy supplied by an ammonia heat pump recovering waste heat of a chiller.

Author(s) : VERDNIK M., ELISKASES P., RIEBERER R.

Type of article: IJR article

Summary

Cleaning-In-Place (CIP) is commonly used in the food and beverage industry to clean process equipment without disassembly. The thermal energy demand to heat up the cleaning fluids used in CIP-systems is usually covered using steam supplied by boilers. The dairy plant analysed in this work utilises a retrofitted heat pump directly integrated into the ammonia refrigerant circuit of a chiller to lift waste heat of the chiller to temperature levels suitable to preheat cleaning fluids of the CIP-system. The heat pump supplies a hot water thermal energy storage, which is used to preheat lye and acid tanks of the CIP-system and to supply additional processes within the cheese dairy to reduce the steam demand.
Due to the complexity of the system and its operation in a producing facility, a model-based approach is used to study the dependency of the time-resolved load profile on the operating parameters with the aim to reduce the steam demand. The simulation model set up in Modelica combines a transient simulation of one part of the CIPsystem based on the given cleaning processes and used equipment with measured load profiles for the second part of the CIP-system and the cheese dairy. The thermal energy storage is considered with a transient model, while for both chiller and heat pump simplified stationary models assuming constant second law efficiencies are used. This simulation model enables to study measures which increase the amount of heat supplied by the heat pump reducing the steam demand by up to 29%.

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Details

  • Original title: Model-based analysis of the cleaning-in-place system in a dairy supplied by an ammonia heat pump recovering waste heat of a chiller.
  • Record ID : 30034905
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 186
  • Publication date: 2026/06
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2026.106911

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