Simulation of an Ammonia-Carbon Dioxide Transcritical Cascade Refrigeration System

Article


Hussen, Hasanen M., Rahman, Mokdad Hayawi, Majdi, Hasan Shakir and Saleh, Khalid. 2024. "Simulation of an Ammonia-Carbon Dioxide Transcritical Cascade Refrigeration System." Mathematical Modelling of Engineering Problems. 11 (4), pp. 943-952. https://doi.org/10.18280/mmep.110411
Article Title

Simulation of an Ammonia-Carbon Dioxide Transcritical Cascade Refrigeration System

Article CategoryArticle
AuthorsHussen, Hasanen M., Rahman, Mokdad Hayawi, Majdi, Hasan Shakir and Saleh, Khalid
Journal TitleMathematical Modelling of Engineering Problems
Journal Citation11 (4), pp. 943-952
Number of Pages943-952
Year2024
PublisherInternational Information and Engineering Technology Association
Place of PublicationCanada
ISSN2369-0739
2369-0747
Digital Object Identifier (DOI)https://doi.org/10.18280/mmep.110411
Web Address (URL)https://www.iieta.org/journals/mmep/paper/10.18280/mmep.110411
AbstractThis study aims to evaluate the viability of employing ammonia (R717), a naturally existing refrigerant, within a transcritical cascade refrigeration configuration. The low temperature (LT) cycle of the cascade transcritical refrigeration system is driven by carbon dioxide, while the high temperature (HT) cycle is propelled by ammonia. Furthermore, the proposed transcritical cascade cycle has the potential to be utilized not just for cooling purposes but also for heat generation. The thermal performance of the cascade cycle has been evaluated for several combinations of design and operational parameters, leading to the identification of optimal presentation metrics like COPheating, COPcooling, COPsys, and the mass flow ratio of R717/R744. The low-temperature cycle is dependent on two specific temperatures that are considered design parameters: the temperature of the evaporator and the temperature at which the gas cooler outlet is set. The analysis demonstrates that the coefficient of performance (COP) for cooling remains relatively constant, with values of approximately 0.601 at 32℃ and 0.680 at 40℃. This suggests that variations in the evaporator temperature do not significantly impact the COP of the system. The impact of increasing discharge pressure on the system's coefficient of performance (COP), heating, and cooling becomes apparent. An inverse correlation exists between the discharge pressure and the coefficient of performance (COP) of the system. Specifically, the COP is measured at 0.791 when the discharge pressure is 8000 kPa, and it decreases to 0.620 when the discharge pressure increases to 12000kPa.
Keywordsammonia-carbon dioxide refrigeration; R717/R744; natural refrigerants; coefficient of performance; transcritical; cascade refrigeration system; transcritical cascade system; heating and cooling performance
Contains Sensitive ContentContains sensitive content
ANZSRC Field of Research 2020401299. Fluid mechanics and thermal engineering not elsewhere classified
Byline AffiliationsUniversity of Technology, Iraq
Al-Farahidi University, Iraq
School of Engineering
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