Energy Analysis of a Transcritical CO 2 Supermarket Refrigeration System with Heat Recovery

Polzot, Alessio; D’Agaro, Paola; Cortella, Giovanni

doi:10.1016/j.egypro.2017.03.227

Cited by 32 publications

(25 citation statements)

References 6 publications

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“…Using the suggested control strategy, Karampour and Sawalha (2014) showed that heat recovery from CO2 trans-critical booster system has high seasonal performance factor (SPF) values of about 4, an SPF comparable to the majority of the commercial heat pumps available in the market. Polzot et al (2017) compared the annual energy use of a CO 2 trans-critical booster system with heat recovery and a base system for three Northern Italy climate conditions. The base system consisted of an R134a/CO 2 cascade refrigeration and an R410A heat pump system.…”

Section: Heating Integration-computer Modelingmentioning

confidence: 99%

Energy efficiency evaluation of integrated CO 2 trans-critical system in supermarkets: A field measurements and modelling analysis

Karampour

Sawalha

2017

International Journal of Refrigeration

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This paper investigates energy efficiency of an integrated CO 2 trans-critical booster system installed in a supermarket in Sweden. The supermarket has applied several features to improve energy efficiency including space and tap water heating, air conditioning (AC), and parallel compression. Using field measurements data, the system performance is evaluated in a warm and a cold month. Furthermore, this integrated energy system concept is modelled and compared with stand-alone HFC-based energy systems. The results show that the system provides the entire AC demands and recovers a great share of the available heat, both with high COP values. The comparative analysis shows that integrated CO 2 system uses about 11% less electricity than stand-alone HFC solutions for refrigeration (i.e. indirect HFC), heating and AC in North of Europe. Energy efficiency analysis of the integrated CO2 system proves that this system is an environmentally friendly all-in-one energy efficient solution suitable for cold climate supermarkets.

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Section: Heating Integration-computer Modelingmentioning

confidence: 99%

Energy efficiency evaluation of integrated CO 2 trans-critical system in supermarkets: A field measurements and modelling analysis

Karampour

Sawalha

2017

International Journal of Refrigeration

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“…To mention some of these research works, heat recovery is studied by (Sawalha, 2013), (Reinholdt and Madsen, 2010) (Polzot et al, 2017) (Nöding et al, 2016) and the integration of air conditioning is discussed by (Hafner et al, 2016) (Karampour and Sawalha, 2016a) (Girotto, 2016) (Gullo et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

State-of-the-art integrated CO2 refrigeration system for supermarkets: A comparative analysis

Karampour

Sawalha

2018

International Journal of Refrigeration

126

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This paper investigates the integrated and state-of-the art features of CO 2 trans-critical booster systems. The main objective is to identify the most promising solutions in terms of energy efficiency impacts.First, the performance of modified features and integrated functions have been compared with the standard CO2 system and alternative heating and air conditioning solutions. Subsequently, the performance of the defined state-of-the-art CO 2 system is compared to natural refrigerant-based cascade and HFC/HFO-based DX and indirect refrigeration solutions operating in cold and warm climates.The results indicate that two-stage heat recovery, flooded evaporation, parallel compression and integration of air conditioning are the most promising features of the state-of-the-art integrated CO2 system. This compact and environmentally friendly system is the most energy efficient solution in cold climates, and is also an efficient solution in warm climates, with comparable efficiency to cascade and HFC/HFO DX systems, but with no existing or potential limitations.

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“…When such heat recovery is not possible for any reason, significant reduction in the approach temperature can lead to enhanced performance of the system [2]. Such a reduction can be attained using a well-designed gas cooler [80]. For economic reasons, finned-tube heat exchangers are normally used as gas coolers [81] whilst possible use of mini-channel heat exchangers is still at the research stage [82].…”

Section: Transcritical Operation Cooling System and Controlmentioning

confidence: 99%

CO2 Refrigeration and Heat Pump Systems—A Comprehensive Review

2019

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An increased awareness of the impacts of synthetic refrigerants on the environment has prompted the refrigeration industry and researchers worldwide to seek better alternatives in terms of technical, economic and environmental performance. CO2 refrigerant, also known as R744, has re-emerged as a potential alternative to existing refrigerants with its zero ozone depletion potential (ODP) and impressively low global warming potential (GWP). A refrigeration system utilising this refrigerant, however, suffers performance degradation when it operates in warm or hot climatic regions due to its inevitable operation in the supercritical region. In addition, the CO2 refrigerant properties necessitate the need for components designed to withstand very high operating pressures. These challenges have not been let unnoticed; related industries and researchers are actively involved in research and development of various components and systems which in turn encourages increased applications of these systems. In this paper, a comprehensive review of CO2 refrigeration systems and the state of the art of the technology and its applications in various industries is presented. In particular, the paper reviews recent research and developments on various aspects of CO2 systems including cycle modifications, exergy analysis of the systems, system modelling, transcritical operation consideration and various existing and potential applications.

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Energy Analysis of a Transcritical CO 2 Supermarket Refrigeration System with Heat Recovery

Cited by 32 publications

References 6 publications

Energy efficiency evaluation of integrated CO 2 trans-critical system in supermarkets: A field measurements and modelling analysis

Energy efficiency evaluation of integrated CO 2 trans-critical system in supermarkets: A field measurements and modelling analysis

State-of-the-art integrated CO2 refrigeration system for supermarkets: A comparative analysis

CO2 Refrigeration and Heat Pump Systems—A Comprehensive Review

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