Monitoring Rapidly Changing Temperatures of the Oscillating Working Fluid in a Regenerative Refrigerator

1991 ◽  
pp. 71-83 ◽  
Author(s):  
Wayne Rawlins ◽  
Ray Radebaugh ◽  
K. D. Timmerhaus
Keyword(s):  
Working Fluid

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

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.

Model, simulation and experiments for a Buoyancy Organic Rankine Cycle

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.

6. Evaluation of Five Extraction Protocols for Determination of Endotoxin in Metal Working Fluid Aerosol

2001 ◽  
Author(s):  
K. Bartlett ◽  
J. Phipps ◽  
K. Kulhankova ◽  
P. Thorne
Keyword(s):  
Working Fluid ◽  
Metal Working

425. An Evaluation of Metal Working Fluid Mist Generation at a Machining Center

1999 ◽  
Author(s):  
W. Heitbrink ◽  
G. Dye ◽  
A. Spencer
Keyword(s):  
Working Fluid ◽  
Metal Working ◽  
Machining Center

EFFECT OF WORKING FLUID ON 3-PORT CPL PERFORMANCE: AN EXPERIMENTAL INVESTIGATION

2014 ◽  
Vol 5 (1-4) ◽  
pp. 491-497
Author(s):  
Abhijit A. Adoni ◽  
Amrit Ambirajan ◽  
Jasvanth V. S. ◽  
D. Kumar ◽  
Pradip Dutta
Keyword(s):  
Experimental Investigation ◽  
Working Fluid

USAGE OF A DIATOMITE-CONTAINING NANOFLUID AS THE WORKING FLUID IN A WICKLESS LOOP HEAT PIPE: EXPERIMENTAL AND NUMERICAL STUDY

2018 ◽  
Vol 49 (17) ◽  
pp. 1721-1744 ◽  
Author(s):  
Adnan Sözen ◽  
Erdem Çiftçi ◽  
Selçuk Keçel ◽  
Metin Gürü ◽  
Halil Ibrahim Variyenli ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Numerical Study ◽  
Working Fluid ◽  
Loop Heat Pipe

Selection of working fluid

2017 ◽  
Author(s):  
Donatas Mishkinis
Keyword(s):  
Working Fluid ◽  
Selection Of

OPTIMUM OPTICAL PROPERTIES OF THE WORKING FLUID IN A DIRECT ABSORPTION COLLECTOR

2011 ◽  
Vol 18 (3) ◽  
pp. 239-247 ◽  
Author(s):  
Jiafei Zhao ◽  
Mingjiang Ni ◽  
Chunhui Shou ◽  
Yanmei Zhang ◽  
Wei Wei ◽  
...  
Keyword(s):  
Optical Properties ◽  
Working Fluid ◽  
Direct Absorption
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