Optimization of a CO2–C3H8 cascade system for refrigeration and heating

Bhattacharyya, Souvik; Mukhopadhyay, Sudipta; Kumar, Ajeet; Khurana, R.K.; Sarkar, Jahar

doi:10.1016/j.ijrefrig.2005.08.010

Cited by 108 publications

(46 citation statements)

References 3 publications

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“…Figure (3.b) shows the temperature variation to provide superheat of (5) °C on the refrigerant side. The evaporator is located between points (5) and (6) in figures (1) and (2). The mass flow rate of refrigerants that is circulated through this cycle is estimated from:…”

Section: Low Temperature Cyclementioning

confidence: 99%

“…Lee et al (2005) [1] implemented Carbon dioxide and ammonia (R744/ R717) to the cascade system and theoretically analyzed the optimal condensation temperature of R744 in the low temperature cycle of the cascade system. Bhattacharyya et al (2006) [2] preferred to use Carbon dioxide and propane (R744/R290) over ammonia, which is a natural but toxic and inflammable refrigerant in a cascade system. Their investigation was focused on the performance and to determine the optimal evaporation temperature of CO2 in a high-temperature cycle suitable for heating.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Analysis for Hybrid Low Temperature Sustainable Energy Sources in Cascade Heat Pump Technology

Tarrad

2017

AJET

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A thermodynamic analysis of compound Cascade refrigeration system at low temperature heat sources was conducted. The analysis was based on a target temperature of hot water at the range of (60-70) Â°C out of the heat pump. The carrier thermal fluid temperature, which provides heat at the low temperature side of the Cascade system, determines the pair of refrigerants to be implemented. A hybrid heat pump design was proposed, which implements the sea water and ground as heat sources in a compound cycle. Two of refrigerant pairs were tested for the performance and energy efficiency comparison at fixed operating conditions. In the low temperature cycle, either R410A or R717 refrigerant was allowed to circulate and R134a is circulated at the high temperature cycle. The minimum isentropic efficiency of commercially available compressors was used in this investigation, a value of (70 %) was chosen. The results of the investigation revealed that R717/R134a exhibited a higher heating (COP) than that of R410A/R134a by (3 %). The results showed that increasing the isentropic efficiency of compressors to (90 %) improved the heating (COP) by (20 %) and minimized the power consumption by (24 %). The specific power consumed by compressors of the proposed system showed a decrease of upto (3 %) lower than that of the sea water base system.

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Section: Low Temperature Cyclementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis for Hybrid Low Temperature Sustainable Energy Sources in Cascade Heat Pump Technology

Tarrad

2017

AJET

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“…A cascade heat pump is a refrigeration cycle configuration which be used in a specific application like a large temperature lift between heat source and heat sink [1]. The aim of the cascade system is to increase the system efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…The heat transfer characteristics of the cascade heat pump have been performed by many researches. Bhattacharyya et al [1][2] experimentally analyzed performance of a cascade refrigeration system with natural refrigerants. It concluded that the performance of the system was highly dependent on the evaporating temperature of the low temperature cycle, the condensing temperature of the high temperature cycle and the temperature difference between the condensing temperature of the low temperature cycle and the evaporating temperature of the high temperature cycle.…”

Section: Introductionmentioning

confidence: 99%

Effect of Transient Heat Transfer of a Condenser on a Cascade Heat Pump Performance

Nenkaew

Tangthieng

2016

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Abstract. Transient heat transfer of a condenser and its effect on a cascade heat pump performance are investigated by comparing experimental results with the prediction from a mathematical model. In the experiment part, the cascade heat pump consists of the lowtemperature refrigeration cycle using R22 and the high-temperature heat pump cycle using R134a. The transient effect is presented by circulating water to receive the rejection heat from the condensing refrigerant of the cascade heat pump causing the rise of the hot water temperature. On the other hand, a mathematic model of the condensation heat consisting of the heat transfer models in the two-phase mixture and the superheated vapor regions is developed. The effect of the hot water flow rate on the hot water temperature and the condensation heat is examined. The result indicates that the hot water temperature continuously increases with time. The condensation heat rapidly increases at the beginning and gradually increases with time. The agreement between the results obtained from the experiment and the model prediction is obtained. The result from the model prediction indicates that the heat transfer on the R134a side dominates the total heat transfer mechanism. The experimental result shows that the COP of the heat pump increases with increasing hot water flow rate, leading to the higher efficiency of the heat pump.

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“…은 R744-R717 캐스케 이드 냉동시스템의 열역학적 모델링을 수행하여 기존 연구결과와 비교하여 최적의 캐스케이드 응축온도를 결정하였으며, Bhattacharyya et al (3) 은 R744사이클의 증발온도를 최적화하기 위한 사이클 연구를 진행하였 고, Dopazo et al (4) 은 R744-R717 캐스케이드 냉동시스 템의 실험적 연구를 수행하여 캐스케이드 응축온도에 따른 최적 COP를 고찰하여 기존의 R717 2단 압축 냉동 사이클과 비교하였다. 또한 Giovanni et al (5) 은 R744와 여러 자연냉매를 혼합한 작동유체를 사용하여 캐스케 이드 냉동시스템의 성능특성에 관한 연구를 수행하였 으며, Mehdi et al (6) 은 R744-R717 캐스케이드 냉동시스 템에서 3E(엑서지, 경제성, 친환경성)에 대한 해석을 진 행하였다.…”

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Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions

Ryu¹,

Cho²

2015

Korean Journal of Air-Conditioning and Refrigeration Engineerin

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The evaporating temperature range required for the low temperature freezing system is from -50℃ to -30℃. Since it is difficult to keep the required capacity in a cabinet, it is advantageous to design the system using a cascade refrigeration system. Use of carbon dioxide and ammonia would be advantageous since ammonia is an environment-friendly working fluid and has a high capacity for performance improvement. To investigate the performance characteristics of the R744-R717 cascade refrigeration system, a theoretical model was developed and performance was analyzed according to cascade heat exchanger operating temperature. The optimal cascade R744 condensing temperature was -5℃, and maximum COP was 1.13 when the temperature difference of the cascade heat exchanger was 5℃. In addition, the total system COP increased by 1.17 when the cascade temperature gap was 3℃ at the middle temperature of -7.5℃. Key wordsCascade refrigeration system(캐스케이드 냉동시스템), Carbon dioxide(이산화탄소), Ammonia(암모니아), COP(성능계수) †Corresponding author, E-mail: hhcho@chosun.ac.kr

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Optimization of a CO2–C3H8 cascade system for refrigeration and heating

Cited by 108 publications

References 3 publications

Thermodynamic Analysis for Hybrid Low Temperature Sustainable Energy Sources in Cascade Heat Pump Technology

Thermodynamic Analysis for Hybrid Low Temperature Sustainable Energy Sources in Cascade Heat Pump Technology

Effect of Transient Heat Transfer of a Condenser on a Cascade Heat Pump Performance

Performance Simulation of a R744-R717 Cascade Refrigeration System According to Operating Conditions

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