Comparative Assessment of Low-GWP Based Refrigerating Plants Operating in Hot Climates

Purohit, Nilesh; Gullo, Paride; Dasgupta, Mani Sankar

doi:10.1016/j.egypro.2017.03.079

Cited by 42 publications

(18 citation statements)

References 12 publications

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“…In the case of trans-critical all-CO2 systems, improvements in energy efficiency have been reported in cool and mild climate with some loss in efficiency in hot climates (e.g., NCI 2015). However, recent modeling studies have indicated the possibility for equivalent to better efficiency even in very warm climates (Gullo et al 2016;Purohit et al 2017). Here we do not assume any additional efficiency improvement or penalty from systems based on CO2 refrigerant that is incremental to the 30% baseline efficiency improvement assumption.…”

Section: Assumptions For Commercial Refrigeration Equipment and Domesmentioning

confidence: 99%

Benefits of Energy Efficient and Low-Global Warming Potential Refrigerant Cooling Equipment

Shah

Wei

Letschert

et al. 2019

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Section: Assumptions For Commercial Refrigeration Equipment and Domesmentioning

confidence: 99%

Benefits of Energy Efficient and Low-Global Warming Potential Refrigerant Cooling Equipment

Shah

Wei

Letschert

et al. 2019

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“…Its target is to cool down R744 exiting GC (thermodynamic state 2 in Figure 1) by promoting the vaporization of the working fluid (e.g., R290, R1270, R1234ze(E)) flowing through the subcooler equipment (SB) (thermodynamic state 18 in Figure 1), which is typically a plate heat exchanger. In this work the refrigerant employed in the mechanical subcooling loop was R290 [7,8,15,24,26,27]. After SB (thermodynamic state 3 in Figure 1), R744 is throttled (thermodynamic state 4 in Figure 1) and the resulting vapor-liquid mixture enters the liquid receiver in which the two phases are separated.…”

Section: System Descriptionmentioning

confidence: 99%

“…parallel compression [6][7][8], which represents the first step towards of the adoption of "CO 2 only" supermarket refrigeration systems in high ambient temperature countries; • cold thermal energy storages [9,10], which allows reducing the energy consumption by shifting a part of the refrigeration load from more adverse (i.e., daytime) to more advantageous (i.e., night-time) operating conditions; • the implementation of the recovery of part of the available expansion work via two-phase ejectors [11][12][13], giving rise to a significant enhancement in overall thermodynamic performance. The conventional expansion valve, in fact, is responsible for the largest irreversibilities in basic transcritical CO 2 refrigerating cycles [14] and, thus, for the significant penalization in their efficiencies as the cooling medium temperature goes up.…”

mentioning

confidence: 99%

Advanced Thermodynamic Analysis of a Transcritical R744 Booster Refrigerating Unit with Dedicated Mechanical Subcooling

Gullo

2018

Energies

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In this work the thermodynamic performance of a transcritical R744 booster supermarket refrigeration system equipped with R290 dedicated mechanical subcooling (DMS) was exhaustively investigated with the aid of the advanced exergy analysis. The outcomes obtained suggested that improvement priority needs to be addressed to the manufacturing of more efficient high-stage (HS) compressors, followed by the enhancement of the gas cooler/condenser (GC), of the medium-temperature (MT) evaporators, of the R290 compressor, and of the low-temperature (LT) evaporators. These conclusions were different from those drawn by the application of the conventional exergy assessment. Additionally, it was found that GC can be enhanced mainly by reducing the irreversibilities owing to the simultaneous interaction among the components. The R290 compressor would also have significantly benefitted from the adoption of such measures, as half of its avoidable irreversibilities were exogenous. Unlike the aforementioned components, all the evaporators were improvable uniquely by decreasing their temperature difference. Finally, the approach temperature of GC and the outdoor temperature were found to have a noteworthy impact on the avoidable irreversibilities of the investigated solution.

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“…In addition, most of works devoted to commercial indirect systems only focused on the performance of the system and not on the energy impact against a multiplexed solution [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Conversion of a Direct to an Indirect Refrigeration System at Medium Temperature Using R-134a and R-507A: An Energy Impact Analysis

et al. 2018

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This work presents the experimental evaluation of energy consumption and refrigerant charge reduction when a commercial direct expansion refrigeration system is converted into an indirect system. The evaluation (with R-134a and R-507A) used a commercial cabinet with doors for medium temperature and a single-stage refrigeration cycle using a semi-hermetic compressor and electronic expansion valve; 24-h energy consumption tests were performed at laboratory conditions for each refrigerant and configuration at three heat rejection levels (23.3, 32.8 and 43.6 • C), maintaining an average product temperature inside the cabinet of 2 • C. The work analyses the impact of the conversion on temperature and pressure indicators, as well as, in the energy performance of each element. For R-134a the refrigerant charge was reduced in a 42.9%, but the energy consumption rose by 22.0%-22.8%; for R-507A the charge reduction was of 32.8% with an increase in energy consumption of between 27.7% and 38.7%.

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Comparative Assessment of Low-GWP Based Refrigerating Plants Operating in Hot Climates

Cited by 42 publications

References 12 publications

Benefits of Energy Efficient and Low-Global Warming Potential Refrigerant Cooling Equipment

Benefits of Energy Efficient and Low-Global Warming Potential Refrigerant Cooling Equipment

Advanced Thermodynamic Analysis of a Transcritical R744 Booster Refrigerating Unit with Dedicated Mechanical Subcooling

Conversion of a Direct to an Indirect Refrigeration System at Medium Temperature Using R-134a and R-507A: An Energy Impact Analysis

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