Low global warming potential (GWP) refrigerant supermarket refrigeration system modeling and its application

Sun, Jian; Kuruganti, Teja; Munk, Jeffrey; Dong, Jin; Cui, Borui

doi:10.1016/j.ijrefrig.2020.12.037

Title: Low global warming potential (GWP) refrigerant supermarket refrigeration system modeling and its application

Journal Article · Fri Jan 01 00:00:00 EST 2021 · International Journal of Refrigeration

DOI:https://doi.org/10.1016/j.ijrefrig.2020.12.037· OSTI ID:1782039

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

As an environmentally friendly low global warming potential (GWP) refrigerant, Carbon dioxide (CO₂) has continuously gained popularity and research attention as alternative refrigerant for supermarket refrigeration system. In this paper, to fulfill the increasing need of accurate Low-GWP supermarket refrigeration models for development of supervisory level control and optimization strategies, a high fidelity model is developed for CO₂ transcritical supermarket refrigeration system which includes compressor rack of low temperature (LT) compressors and medium temperature (MT) compressors, air-cooled gas cooler, evaporator, expansion valves and other auxiliary equipment. A resistance-capacity model structure is proposed to simulate the display cases. Semi-thermodynamic models are proposed to estimate reciprocating compressors volumetric efficiency and power consumption. Furthermore the zone modeling approach is used for evaporator simulation, and air-cooled gas cooler is modeled with distributed modeling method. The expansion valve simulation is based on orifice flow model. To calibrate these models, both manufacture performance data and experimental data are used. The experiments are conducted with a full instrumental CO₂ supermarket refrigeration system installed in Oak Ridge National Lab Flexible Research Platform (FRP). The simulation model can predict the system performance, including power consumption, cooling capacity, mass flow rate, temperature, and pressure, with high accuracy (within ±4%) compared to experimental data. In addition, this developed model has been used to create the system optimum high side pressure for high side expansion valve control, and to generate wide operating range simulation data for developing the batter-equivalent commercial refrigeration system model which can be used in grid interactive control development.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1782039

Alternate ID(s):: OSTI ID: 1797513

Journal Information:: International Journal of Refrigeration, Vol. 126; ISSN 0140-7007

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
global warming potential
supermarket refrigeration
carbon dioxide
optimum high-side pressure

Title: Low global warming potential (GWP) refrigerant supermarket refrigeration system modeling and its application

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