Thermodynamic analyses on an ejector enhanced CO2 transcritical heat pump cycle with vapor-injection

Bai, Tao; Yan, Gang; Yu, Jianlin

doi:10.1016/j.ijrefrig.2015.04.010

Cited by 70 publications

(31 citation statements)

References 48 publications

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“…On the other hand, methanol is toxic and highly flammable; therefore, important preventive measures should be taken. Recently, many studies have focused on the carbon dioxide (R744) refrigerant: CO 2 is a natural substance, is nonflammable and has negligible GWP and zero ODP [205,[210][211][212][213][214][215][216][217][218][219][220][221][222][223][224][225][226][227]. In particular, the refrigeration cycles using carbon dioxide are transcritical (the critical temperature of CO 2 is approximately 30.85°C).…”

Section: Working Fluids In Ejector Refrigerationmentioning

confidence: 99%

“…In addition, a comprehensive exergy analysis was implemented, and the resulting second law efficiencies obtained were 6.6% and 7.52% for conventional and ejector based systems, respectively. Bai et al [222] studied a CO 2 TERS cycle with a sub-cooler (ESCVI). The proposed cycle was found to have better performance than the conventional vapor injection cycle, with an increase of COP up to 7.7%.…”

Section: One Ejector Co 2 Tersmentioning

confidence: 99%

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Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

414

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a b s t r a c tThe increasing need for thermal comfort has led to a rapid increase in the use of cooling systems and, consequently, electricity demand for air-conditioning systems in buildings. Heat-driven ejector refrigeration systems appear to be a promising alternative to the traditional compressor-based refrigeration technologies for energy consumption reduction. This paper presents a comprehensive literature review on ejector refrigeration systems and working fluids. It deeply analyzes ejector technology and behavior, refrigerant properties and their influence over ejector performance and all of the ejector refrigeration technologies, with a focus on past, present and future trends. The review is structured in four parts. In the first part, ejector technology is described. In the second part, a detailed description of the refrigerant properties and their influence over ejector performance is presented. In the third part, a review focused on the main jet refrigeration cycles is proposed, and the ejector refrigeration systems are reported and categorized. Finally, an overview over all ejector technologies, the relationship among the working fluids and the ejector performance, with a focus on past, present and future trends, is presented.

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Section: Working Fluids In Ejector Refrigerationmentioning

confidence: 99%

Section: One Ejector Co 2 Tersmentioning

confidence: 99%

Ejector refrigeration: A comprehensive review

Besagni

Mereu

Inzoli

2016

Renewable and Sustainable Energy Reviews

414

View full text Add to dashboard Cite

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“…The thermodynamic analysis is described by means of the mass, momentum and energy balance equations. Mass balance equation [2,[43][44][45]:…”

Section: Calculation Unit Algorithm Structurementioning

confidence: 99%

“…Geometrical data of the existing SEPS is indicated in Table 1 [46]. Momentum balance equation [2,43,44]:…”

Section: Calculation Unit Algorithm Structurementioning

confidence: 99%

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Energy efficiency analysis of steam ejector and electric vacuum pump for a turbine condenser air extraction system based on supervised machine learning modelling

et al. 2016

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Heating Control Strategy of CO₂ Heat Pump Air Conditioning System of Electric Vehicle Based on Waste Heat Recovery Technology

Zhang,

Zhao,

et al. 2024

Energy Tech

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The control strategy of the thermal management system is crucial for ensuring the thermal comfort of an electric vehicles (EVs) cabin. However, the performance of heat pump air conditioning (HPAC) significantly deteriorates in low‐temperature weather conditions. In recent years, the CO2 HPAC system has emerged as a potential solution to address the insufficient heating capacity in such environments. In order to ensure cabin comfort and optimize winter mileage, a three‐stage heating control method for CO2 air source heat pump (ASHP) system is proposed in this article. Firstly, a simulation model is established and its feasibility is verified by comparing it with experimental results. Subsequently, the cabin's heating capacity is examined under four different low‐temperature conditions (–5, −10, −15, and −20 °C). Optimal opening and closing strategies of each mode are discussed to maintaining the temperature requirements of the cabin. The three‐stage heating control strategy demonstrates improvements in battery state of charge performance over 7200 s of running time compared to conventional CO2 ASHP: optimization rates increase by 8.07% at −5 °C, a further increase by 10.03% at −10 °C, a substantial increase by 14.51% at −15 °C, and under extreme conditions of −20 °C, the optimization rate is as high as 16.21%.

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Thermodynamic analyses on an ejector enhanced CO2 transcritical heat pump cycle with vapor-injection

Cited by 70 publications

References 48 publications

Ejector refrigeration: A comprehensive review

Ejector refrigeration: A comprehensive review

Energy efficiency analysis of steam ejector and electric vacuum pump for a turbine condenser air extraction system based on supervised machine learning modelling

Heating Control Strategy of CO₂ Heat Pump Air Conditioning System of Electric Vehicle Based on Waste Heat Recovery Technology

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Thermodynamic analyses on an ejector enhanced CO2 transcritical heat pump cycle with vapor-injection

Cited by 70 publications

References 48 publications

Ejector refrigeration: A comprehensive review

Ejector refrigeration: A comprehensive review

Energy efficiency analysis of steam ejector and electric vacuum pump for a turbine condenser air extraction system based on supervised machine learning modelling

Heating Control Strategy of CO2 Heat Pump Air Conditioning System of Electric Vehicle Based on Waste Heat Recovery Technology

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Heating Control Strategy of CO₂ Heat Pump Air Conditioning System of Electric Vehicle Based on Waste Heat Recovery Technology