Modelling of a real CO2 booster installation and evaluation of control strategies for heat recovery applications in supermarkets

Escrivà, Emilio José Sarabia; Acha, Salvador; Brun, Niccolò Le; Francés, Víctor Manuel Soto; Ojer, José Manuel Pinazo; Markides, Christos N.; Shah, Nilay

doi:10.1016/j.ijrefrig.2019.08.005

Cited by 20 publications

(19 citation statements)

References 22 publications

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“…As Table 1 illustrates, non-electricity related emissions in commercial organisations are not insignificant. To satisfy heating demand supermarkets are exploring heat recovery methods from their refrigeration systems so they can displace natural gas related emissions, although matching supply and demand is a persistent issue that requires thermal storage [14]. With regards to minimising the impact of carbon intensive refrigerants advanced performance indicators championing energy efficiency and leakage reduction is advocated [15] as well as the phasing out of HFC refrigerants by increasing the uptake of natural refrigerants [16].…”

Section: Introductionmentioning

confidence: 99%

The development of a low-carbon roadmap investment strategy to reach Science Based Targets for commercial organisations with multi-site properties

Ayoub

Gaigneux

Brun

et al. 2020

Building and Environment

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Section: Introductionmentioning

confidence: 99%

The development of a low-carbon roadmap investment strategy to reach Science Based Targets for commercial organisations with multi-site properties

Ayoub

Gaigneux

Brun

et al. 2020

Building and Environment

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“…The one-dimensional thermal storage model described in this paper was integrated into the steady-state model developed by Sarabia et al (2019). As a timestep often minutes was chosen, the steady-state nature of the model means that the model takes a snapshot of the thermodynamic conditions every ten minutes.…”

Section: Limitations and Validity Of The Modelmentioning

confidence: 99%

“…(Left) Schematic of a CO2 booster refrigeration system. (Right) Pressure-enthalpy diagrams for transcritical and subcritical operation(Sarabia Escriva et al, 2019).…”

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CO2 refrigeration system heat recovery and thermal storage modelling for space heating provision in supermarkets: An integrated approach

et al. 2020

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The large amount of recoverable heat from CO2 refrigeration systems has led UK food retailers to examine the prospect of using refrigeration integrated heating and cooling systems to provide both the space heating and cooling to food cabinets in supermarkets. This study assesses the performance of a refrigeration integrated heating and cooling system installation with thermal storage in a UK supermarket. This is achieved by developing a thermal storage model and integrating it into a pre-existing CO2 booster refrigeration model. Five scenarios involving different configurations and operation strategies are assessed to understand the techoeconomic implications. The results indicate that the integrated heating and cooling system with thermal storage has the potential to reduce energy consumption by 17-18% and GHG emissions by 12-13% compared to conventional systems using a gas boiler for space heating. These reductions are achieved despite a marginal increase of 2-3% in annual operating costs. The maximum amount of heat that can be stored and utilised is constrained by the refrigeration system compressor capacity. These findings suggest that refrigeration integrated heating and cooling systems with thermal storage are a viable heating and cooling strategy that can significantly reduce the environmental footprint of supermarket space heating provision and under the adequate circumstances can forsake the use of conventional fossil-fuel (natural gas) boiler systems in food retail buildings.

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“…Este tipo de sistemas ha sido analizado ampliamente por investigadores del instituto KTH, como Sawalha [75,76], Karampour [77][78][79][80][81], Abdi et al 2014 [82] o Mateu et al 2018 [83], entre otros, mostrando grandes mejoras energéticas, principalmente para países con climas fríos. Otros investigadores como Hafner et al 2012 [60], Polzot et al 2016 [84] o Sarabia et al 2019 [85] analizaron también estos sistemas "todo en uno" para la mejora de la eficiencia de las instalaciones booster CO2. No obstante, cabe destacar que,…”

Section: Historia Reciente De La Refrigeraciónunclassified

Desarrollo de una instalación frigorífica para la implementación de sistemas Booster CO2. Análisis teórico y experimental de diferentes configuraciones

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This work analyses different refrigeration architectures for commercial refrigeration providing service to medium and low temperature simultaneously: HFC/R744 cascade, R744 transcritical booster, R744 transcritical booster with parallel compression, R744 transcritical booster with gas ejectors, R513A cascade/R744 subcritical booster, and R513A cascade/R744 subcritical booster with parallel compression. The models were developed using compressor manufacturers' data and real restrictions of each system component. Limitations and operating range of each component and architecture were analysed for environment temperatures from 0 to 40ºC considering thermal loads and environment temperature profiles for warm climates. For booster systems, cascade with subcritical booster with parallel compression provide highest coefficient of performance (COP) for temperatures below 12ºC and above 30ºC with COP increases compared basic booster up to 60.6%, whereas for transcritical boosters, architecture with gas ejectors obtains the highest COP with COP increases compared to the basic booster up to 29.5%. In annual energy terms, differences among improved booster systems are below 8% in the locations analysed. In Total Equivalent Warming Impact (TEWI) terms, booster architectures get the lowest values with small differences between improved boosters.

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Modelling of a real CO2 booster installation and evaluation of control strategies for heat recovery applications in supermarkets

Cited by 20 publications

References 22 publications

The development of a low-carbon roadmap investment strategy to reach Science Based Targets for commercial organisations with multi-site properties

The development of a low-carbon roadmap investment strategy to reach Science Based Targets for commercial organisations with multi-site properties

CO2 refrigeration system heat recovery and thermal storage modelling for space heating provision in supermarkets: An integrated approach

Desarrollo de una instalación frigorífica para la implementación de sistemas Booster CO2. Análisis teórico y experimental de diferentes configuraciones

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