Numerical analysis of transcritical carbon dioxide  compression cycle: a case study

Keshtkar, Mohammad Mehdi

doi:10.14419/jacst.v7i1.8827

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Robinson et al, [2] presented a comprehensive study and a detailed literature review on the use of carbon dioxide in trans-critical vapor compression refrigeration cycles. Numerical analysis of trans-critical carbon dioxide compression cycle was conducted by Keshtkar [3]. Yamasaki et al, [4], presented an introduction of trans-critical refrigeration cycle utilizing CO2 as working fluid.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on The Performance of Trans-Critical Carbon Dioxide Refrigeration System Using Porous Evaporator

Altarawneh¹

2020

ARFMTS

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An experimental study on the performance of trans-critical carbon dioxide refrigeration system is conducted when using porous evaporator for different evaporation temperatures, ranging from (-2°C to 8°C), different gas cooler outlet temperatures ranging from (38°C to 49°C) and different porosities (empty tube (porosity = 100%)), 45%, 41% and 38% porous tube).Variations of refrigeration capacity with gas cooler outlet temperatures for different evaporator porosities were studied. Coefficient of performance as a function of gas cooler outlet temperature, gas cooler outlet pressure and evaporation temperature were investigated for different evaporator porosities. Pressure drop in porous evaporator as a function of evaporation temperature for different porosities is studied. Effects of evaporation temperature and evaporator porosity on power consumption per ton of refrigeration were also, studied. An average increase of about 40% and 64% in refrigeration capacity and COP were predicted, respectively, when decreasing gas cooler out let temperature from 49°C to 38°C and using evaporator with 38% porosity. Coefficient of performance of CO2 transcritical refrigeration system increases with increasing gas cooler pressure up to an optimum value and then it decreases at large values of gas cooler pressures. Power consumption per ton of refrigeration (PCTR) reached minimum values at low evaporation temperatures and low evaporator porosities with an average percentage decrease of about 38%. An increase of pressure drop was also, recorded during the evaporation process when evaporation temperature increased, and evaporator porosity decreased.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on The Performance of Trans-Critical Carbon Dioxide Refrigeration System Using Porous Evaporator

Altarawneh¹

2020

ARFMTS

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Effect of using a porous gas cooler on the performance of trans‐critical carbon dioxide refrigeration cycle

Tarawneh

2021

Heat Trans

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Using porous gas coolers is a novel method that can be used to enhance performance parameters in the transcritical carbon dioxide refrigeration cycle. The behavior of trans-critical carbon dioxide and the effect of using porous gas coolers in refrigeration systems are researched in this experimental study. Cycle coefficient of performance, heat rejection rate, evaporator cooling capacity, evaporator cooling capacity enhancement factor, coefficient of performance enhancement factor, power consumption per ton of refrigeration, and pressure drop were investigated as functions of gas cooler outlet temperature, gas cooler porosity, gas cooler pressure ratio, and air ambient temperature.Porosities of 100% (empty gas cooler; no steel balls are used during this test), 48%, 40%, and 34% were considered. Experiments were conducted at 4°C evaporating temperature and 5°C superheat. Evaporator cooling capacity and evaporator cooling capacity enhancement factor are increased by about 103% and 35.4% when reducing gas cooler outlet temperature and porosity up to 36°C and 34%, respectively. Results of this study showed that cycle coefficient of performance, coefficient of performance enhancement factor, and gas cooler heat rejection rate can be increased up to 94.4%, 55.8%, and 85.5%, respectively when reducing gas cooler porosity and gas cooler outlet temperature

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Thermodynamic, Economic, and Environmental Comparison Between the Direct and Indirect CO2 Refrigeration Cycle With Conventional Indirect NH3 Cycle With Considering a Heat Recovery System in an Ice Rink: A Case Study

Momeni

Keshtkar

2019

Journal of Energy Resources Technology

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In industrial refrigeration systems, such as ice rinks, because of consumption of a lot of energy, the selection of a refrigeration system is very important. At this work, environmental considerations are combined with thermodynamics and economics for the comparison of three different refrigeration systems in an ice rink, including the NH3/brine, CO2/brine, and full CO2. The first law of thermodynamics is used to calculate the system's coefficient of performance (COP) and the second law of thermodynamics is applied to quantify the exergy destructions in each component of a refrigeration system. With regard to the above, the exergy efficiency and energy consumption of the systems are determined by taking into account the heat recovery process that has been performed in the above-mentioned cycles. The results indicate that if a heat recovery system has been used in the refrigeration system, coefficient of performance of full CO2 refrigeration system is 33% higher than the CO2/brine and 66% greater than the NH3/brine system. The results also show that, whatever the refrigeration evaporating temperature in the NH3/brine system reaches lower than −12.4 °C, the total cost of this system will be greater than the full CO2 system.

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Numerical analysis of transcritical carbon dioxide compression cycle: a case study

Cited by 3 publications

References 13 publications

Experimental Study on The Performance of Trans-Critical Carbon Dioxide Refrigeration System Using Porous Evaporator

Experimental Study on The Performance of Trans-Critical Carbon Dioxide Refrigeration System Using Porous Evaporator

Effect of using a porous gas cooler on the performance of trans‐critical carbon dioxide refrigeration cycle

Thermodynamic, Economic, and Environmental Comparison Between the Direct and Indirect CO2 Refrigeration Cycle With Conventional Indirect NH3 Cycle With Considering a Heat Recovery System in an Ice Rink: A Case Study

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