Investigation and optimization of performance of nano-scale Stirling refrigerator using working fluid as Maxwell–Boltzmann gases

Assessment of nano-scale Stirling refrigerator using working fluid as Maxwell–Boltzmann gases by thermo-ecological and sustainability criteria

Chemical Physics Letters ◽

10.1016/j.cplett.2016.06.064 ◽

2016 ◽

Vol 658 ◽

pp. 303-308 ◽

Cited By ~ 9

Author(s):

Emin Açıkkalp ◽

Ahmet Fevzi Savaş ◽

Necmettin Caner ◽

Hasan Yamık

Keyword(s):

Working Fluid ◽

Sustainability Criteria ◽

Nano Scale ◽

Stirling Refrigerator

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Effect of working fluid on the performance of the duplex Stirling refrigerator

Journal of Cleaner Production ◽

10.1016/j.jclepro.2018.04.076 ◽

2018 ◽

Vol 189 ◽

pp. 98-107 ◽

Cited By ~ 7

Author(s):

Bahadır Doğan ◽

M. Mete Ozturk ◽

L. Berrin Erbay

Keyword(s):

Working Fluid ◽

Stirling Refrigerator

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Determining of the optimum performance of a nano scale irreversible Dual cycle with quantum gases as working fluid by using different methods

Physica A Statistical Mechanics and its Applications ◽

10.1016/j.physa.2015.03.064 ◽

2015 ◽

Vol 433 ◽

pp. 247-258 ◽

Cited By ~ 17

Author(s):

Emin Açıkkalp ◽

Necmettin Caner

Keyword(s):

Quantum Gases ◽

Working Fluid ◽

Optimum Performance ◽

Nano Scale ◽

Dual Cycle

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Experimental study of thermohydraulic characteristics and irreversibility analysis of novel axial corrugated tube with spring tape inserts

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200192 ◽

2020 ◽

Vol 92 (3) ◽

pp. 30901

Author(s):

Suvanjan Bhattacharyya ◽

Debraj Sarkar ◽

Ulavathi Shettar Mahabaleshwar ◽

Manoj K. Soni ◽

M. Mohanraj

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Thermal Performance ◽

Working Fluid ◽

The Novel ◽

Heat Exchanger Tube ◽

Heat Transfer Augmentation ◽

Corrugated Tube ◽

The Impact ◽

Exchanger Tube

The current study experimentally investigates the heat transfer augmentation on the novel axial corrugated heat exchanger tube in which the spring tape is introduced. Air (Pr = 0.707) is used as a working fluid. In order to augment the thermohydraulic performance, a corrugated tube with inserts is offered. The experimental study is further extended by varying the important parameters like spring ratio (y = 1.5, 2.0, 2.5) and Reynolds number (Re = 10 000–52 000). The angular pitch between the two neighboring corrugations and the angle of the corrugation is kept constant through the experiments at β = 1200 and α = 600 respectively, while two different corrugations heights (h) are analyzed. While increasing the corrugation height and decreasing the spring ratio, the impact of the swirling effect improves the thermal performance of the system. The maximum thermal performance is obtained when the corrugation height is h = 0.2 and spring ratio y = 1.5. Eventually, correlations for predicting friction factor (f) and Nusselt number (Nu) are developed.

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Model, simulation and experiments for a Buoyancy Organic Rankine Cycle

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200113 ◽

2020 ◽

Vol 92 (1) ◽

pp. 10906

Author(s):

Jeroen Schoenmaker ◽

Pâmella Gonçalves Martins ◽

Guilherme Corsi Miranda da Silva ◽

Julio Carlos Teixeira

Keyword(s):

Model Simulation ◽

Organic Rankine Cycle ◽

Thermodynamic Cycle ◽

Rankine Cycle ◽

Test Body ◽

Working Fluid ◽

Proof Of Concept ◽

Energy Scenario ◽

New Type ◽

Fluid Reservoir

Organic Rankine Cycle (ORC) systems are increasingly gaining relevance in the renewable and sustainable energy scenario. Recently our research group published a manuscript identifying a new type of thermodynamic cycle entitled Buoyancy Organic Rankine Cycle (BORC) [J. Schoenmaker, J.F.Q. Rey, K.R. Pirota, Renew. Energy 36, 999 (2011)]. In this work we present two main contributions. First, we propose a refined thermodynamic model for BORC systems accounting for the specific heat of the working fluid. Considering the refined model, the efficiencies for Pentane and Dichloromethane at temperatures up to 100 °C were estimated to be 17.2%. Second, we show a proof of concept BORC system using a 3 m tall, 0.062 m diameter polycarbonate tube as a column-fluid reservoir. We used water as a column fluid. The thermal stability and uniformity throughout the tube has been carefully simulated and verified experimentally. After the thermal parameters of the water column have been fully characterized, we developed a test body to allow an adequate assessment of the BORC-system's efficiency. We obtained 0.84% efficiency for 43.8 °C working temperature. This corresponds to 35% of the Carnot efficiency calculated for the same temperature difference. Limitations of the model and the apparatus are put into perspective, pointing directions for further developments of BORC systems.

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