Thermodynamic analysis of a novel multi-target-temperature cascade cycle for refrigeration

Zhu, Yongfa; Peng, Zhao‐Rui; Wang, Guan‐Bang; Zhang, Xinrong

doi:10.1016/j.enconman.2021.114380

Cited by 24 publications

(5 citation statements)

References 54 publications

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“…(1) All equipment are assumed to be steady-state and steady-flow processes [3,34] (2) The gravitational potential energy and kinetic energy are not considered in the refrigeration system [3] (3) All the circuit components and pipelines are well isolated so that heat loss and pressure drop in connecting pipes and heat exchangers are ignored [35] (4) Refrigerants at the CHE outlets, evaporator outlet, and condenser outlet are in the saturated state [36] (5) The ambient temperature and pressure are fixed at 25 °C and 0.1 MPa (6) The difference between the refrigerated space temperature and the evaporation temperature is constant and is 5 °C [37] Based on the above assumptions, the following equations for each component can be obtained. For given working conditions, the evaporation temperature T e and condensation temperature T c are known and the cooling capacity is assumed to be 9 kW.…”

Section: Thermodynamic Modeling and Analysismentioning

confidence: 99%

“…Cascade refrigeration system (CRS) is generally used in commercial and industrial refrigeration applications due to its ability to meet two different cooling requirements at medium and low temperatures and high coefficient of performance (COP) values [1,2]. As the requirements of rather low freezing temperature (ranging from -30 to 50 °C) are constantly needed, these temperatures cannot be reached with a single-stage steam compression refrigeration system [3]. Carbon dioxide (CO 2 ) is an environmentally friendly refrigerant which has low global warming potential (GWP) and no ozone depletion potential (ODP).…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Analysis of an NH3/CO2 Cascade Refrigeration System with Subcooling in the Low-Temperature Circuit Utilizing the Expansion Work

Yang

Chen

Chi

et al. 2023

International Journal of Energy Research

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NH3/CO2 cascade refrigeration system is recognized one of the most promising technologies in low-temperature application. In this paper, a NH3/CO2 cascade refrigeration system with subcooling in low-temperature circuit driven by recovery expansion work has been proposed. The aim of this study is to investigate the proposed cascade refrigeration system compared with conventional cascade refrigeration system. Mathematical models based on energy conservation and exergy balance are established. The selection of different refrigerants in auxiliary subcooling system is discussed. The effects of operating parameters such as the condensation temperature of the low-temperature circuit, evaporation temperature, and expander efficiency on system performance are evaluated. The results show that the coefficient of performance and exergy efficiency of the proposed system are about 7.56% and 7.98% higher than that of conventional cascade refrigeration system. The discharge temperature of NH3 compressor can be significantly reduced by 18.33%. The isentropic efficiency of the expander has a large impact on the system performance.

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Section: Thermodynamic Modeling and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of an NH3/CO2 Cascade Refrigeration System with Subcooling in the Low-Temperature Circuit Utilizing the Expansion Work

Yang

Chen

Chi

et al. 2023

International Journal of Energy Research

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“…The best results were achieved in the cooling capacity of the R290 and R1270 refrigerants. Zhu et al (17) studied the low and high temperature circuits in the R744/R717 cascade system and the multi-target temperature cascade system in which the R1270 refrigerant was used. With the multi-target temperature cascade system, 25% and 10% improvement in COP and 19% and 5% rise in exergy efficiency were obtained according to low and high temperature cycling, respectively.…”

Section: System Descriptionmentioning

confidence: 99%

Energy, Exergy, and Environment Performance Evaluation of Cascade Refrigeration System with Natural Refrigerants

KOŞAN

2023

Hittite Journal of Science and Engineering

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Cascade refrigeration systems are preferred in applications where low temperature cooling is required, such as in some special industrial and laboratory applications. Since, in these systems, the energy consumed by the compressors is less and the compressor outlet temperature is lower. Due to environmental problems, the use of natural refrigerants in cascade refrigeration systems has become to be of great importance. In this study, two cascade systems consisting of R744/R290 (System 1) and R1270/R290 (System 2) natural refrigerant pairs were designed and thermodynamically examined. In the analyzes performed according to different evaporator temperatures, the highest COP value was 3.66 at -20℃ evaporating temperature was obtained in the cascade system consisting of the R1270/R290 refrigerant pair. Moreover, it was considered that there was a 17.95% enhancement in exergy efficiency with the use of R1270 refrigerant in the low temperature cycle. By the rise in the evaporator temperature, energy consumption decreases and as a result, the amount of carbon dioxide emissions reduced was attained.

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“…Yu et al (Yu et al, 2020) analyzed a novel cascade absorption system driven by low-grade waste heat and optimized the system performance by implementing a multiobjective optimization method. Zhu et al (Zhu et al, 2021) put forward a novel multi-target-temperature cascade system, and evaluated its optimum performances from the viewpoints of economics and thermodynamics and compared with other multitemperature cascade systems. Mahmoudan et al (Mahmoudan et al, 2021) evaluated a multi-level cascade system and conducted four different multi-objective optimization results.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and optimization of a novel cascade refrigeration system driven by waste heat

et al. 2023

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Direct discharge of waste heat from internal combustion engines (ICEs) is unfavorable for the efficient and clean fuel utilization. Here, a novel combined absorption-compression cascade refrigeration cycle is proposed to efficiently capture low-grade waste heat and supply cooling capacity for food freezing in vessels or refrigerated trucks. The intention of this work lies in: i) Comprehensively evaluating the performances of the proposed system; ii) Gaining the optimal operating conditions of the system. Aimed that, analysis models of energy, exergy, economy, and environment are set up to evaluate the sweeping performances. Further, multi-objective optimization is introduced to obtain the optimal operating parameters including evaporation and condensation temperature of the low-temperature stage, generation temperature and condensation temperature of the high-temperature stage, and cascade temperature differences. By applying multi-objective optimization, the coefficient of performance and exergy efficiency of the system are elevated from 1.283 to 1.547, and 0.222 to 0.246, respectively, the discharge amount of carbon dioxide are reduced from 71.40 to 59.57 tons year−1, and annual total cost are decreased from 16,028 to 15,055 $ year−1 compared to initial operating conditions.

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Thermodynamic analysis of a novel multi-target-temperature cascade cycle for refrigeration

Cited by 24 publications

References 54 publications

Thermodynamic Analysis of an NH3/CO2 Cascade Refrigeration System with Subcooling in the Low-Temperature Circuit Utilizing the Expansion Work

Thermodynamic Analysis of an NH3/CO2 Cascade Refrigeration System with Subcooling in the Low-Temperature Circuit Utilizing the Expansion Work

Energy, Exergy, and Environment Performance Evaluation of Cascade Refrigeration System with Natural Refrigerants

Evaluation and optimization of a novel cascade refrigeration system driven by waste heat

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