Assessment of Alumina Nanofluid as a Coolant in Double Pipe Gas Cooler for Trans-critical CO 2 Refrigeration Cycle

Purohit, Nilesh; Khangarot, Balraj Singh; Gullo, Paride; Purohit, Kamlesh; Dasgupta, Mani Sankar

doi:10.1016/j.egypro.2017.03.048

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…That air velocity is maintained consistently inside the study for every cooling load. The A nozzles utilised for the study had 1/8GG-SS1.8, the spraying level was set to 70 mm, the flow rate was set to maximal release, and indeed, the bypassing channel remained locked [8].…”

Section: Results and Discussion 31 Impact Of Refringent Chargementioning

confidence: 99%

Estimate the Heat transfer rate on the closed loop cooling system through Gas fluid

2021

Webology

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Conventional heat flow as well as velocity and temperature technologies also couldn't fulfil the requirements due to the fast growth in thermal gradient as well as the desire for downsizing of computer components. As a result, spray conditioning research is conducted in order to get not only the fundamental energy transmission but also the freezing mechanism. The spraying evaporator was utilised in this operation to study the effect of cooling air upon the temperature field in constant, dynamical warming as well as dissipation operations. In a constant, the conductivity rose even as the ammonia load grew. Following critical thermal expansion, both the thermal gradient and entropy generation decreased rapidly inside the dynamically dissipated phase, and the global mean temperature fall line of each cooling load was provided. The optimal coolant load has been determined by taking into account both refrigeration variables as well as the program's process efficiency. Throughout this research, the spraying conditioning technique had the maximum heat flux, entropy generation, and maximum pressure losses whenever the coolant working fluid reached 0.8 MPa. At the same time, inside the thermal boundary area, the appropriate air temperatures fall, but more delicate thermal gradient curves are calculated. These findings of the study may help to develop spraying chillers, which should be utilised prior to leaving the nucleation heat capacity to prevent chilling failures.

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Section: Results and Discussion 31 Impact Of Refringent Chargementioning

confidence: 99%

Estimate the Heat transfer rate on the closed loop cooling system through Gas fluid

2021

Webology

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“…They found that an increase in mass flux enhances the scCO 2 HTC, but the effects of heat flux and tube diameter depend on the scCO 2 property variation in a radial direction. Studies on horizontally circular tube-in-tube HXs showed that the HTC of scCO 2 is a combination of free and forced convection because of the buoyancy effect close to the pseudo-critical vicinity [38][39][40].…”

Section: Gas Coolermentioning

confidence: 99%

Recent Advances in Transcritical CO2 (R744) Heat Pump System: A Review

et al. 2019

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Heat pump (HP) is one of the most energy efficient tools for address heating and possibly cooling needs in buildings. Growing environmental concerns over conventional HP refrigerants, chlorofluorocarbons (CFCs), and hydrofluorocarbons (HFCs) have forced legislators and researchers to look for alternatives. As such, carbon dioxide (R744/CO2) has come to light due to its low global warming potential (GWP) and zero ozone depleting characteristics. Even though CO2 is environmentally benign, the performance of CO2 HP has been of concern since its inception. To improve the performance of CO2 HP, research has been playing a pivotal role in developing functional designs of heat exchangers, expansion devices, and compressors to suit the CO2 transcritical cycle. Different CO2 HP cycles coupled with auxiliary components, hybrid systems, and refrigerant mixtures along with advanced control strategies have been applied and tested. This paper presents a complete overview of the most recent developments of transcritical CO2 HPs, their components, and applications.

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“…Sarkar [6] evaluated the effectiveness of Al2O3-water, TiO2water, CuO-water, and Cu-water for cooling a CO2 gas cooler and noted the superiority of Al2O3 over the other nanofluids. Purohit et al [7] studied the performance of Al2O3-water nanofluids for cooling a trans-critical CO2 refrigeration system, and it was concluded that Al2O3 gave a better performance than water. However, typical mineral or metallic nanoparticle materials threaten the environment as they do not quickly decompose when disposed of, hence the need for bio-nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer and Pressure Drop Characteristics of Mango Bark-CO2 Nanofluid in inclined Gas Cooling Process

Okwesilieze¹,

Uwadoka²,

Adelaja³

et al. 2022

Preprint

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This paper investigates the heat transfer and pressure drop characteristics of mango bark-CO2 nanofluid. The physical model comprises flow in a pipe under a constant heat flux of -10W/m 2 . The inclination angle varies between -90 o and +90 o , and volume fraction between 0% and 2.0% for Reynolds numbers of 50 and 100. The numerical code is validated using three research studies on heat transfer coefficient, Nusselt number, and pressure drop. Results show that the heat transfer coefficient and pressure increase with nanofluid volume concentration and Reynolds number. However, the heat transfer coefficient varies nonlinearly with the inclination angle and has a maximum occurring when the inclination angles are -30 o and +60 o while the pressure drop is relatively constant.

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Assessment of Alumina Nanofluid as a Coolant in Double Pipe Gas Cooler for Trans-critical CO 2 Refrigeration Cycle

Cited by 8 publications

References 19 publications

Estimate the Heat transfer rate on the closed loop cooling system through Gas fluid

Estimate the Heat transfer rate on the closed loop cooling system through Gas fluid

Recent Advances in Transcritical CO2 (R744) Heat Pump System: A Review

Numerical Investigation of Heat Transfer and Pressure Drop Characteristics of Mango Bark-CO2 Nanofluid in inclined Gas Cooling Process

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