Begell House Inc.
International Journal of Energy for a Clean Environment
IJECE
2150-3621
18
4
2017
A COMPARATIVE STUDY ON THE PERFORMANCE OF THE DOMESTIC REFRIGERATOR USING R600A AND LPG WITH VARYING REFRIGERANT CHARGE AND CAPILLARY TUBE LENGTH
287-302
10.1615/InterJEnerCleanEnv.2018024395
Sunday Olayinka
Oyedepo
Department of Mechanical Engineering, Covenant University, Ota, Nigeria
R. O.
Fagbenle
Mechanical Engineering Department, University of Ibadan, Nigeria
Taiwo O.
Babarinde
Department of Mechanical Engineering Science, University of Johannesburg,
Johannesburg, South Africa; Department of Mechanical Engineering, Covenant University Ota, Nigeria
K. M.
Odunfa
Mechanical Engineering Department, University of Ibadan, Nigeria
R. O.
Leramo
The Energy and Environment Research Group (TEERG), Mechanical Engineering Department,
Covenant University, Ota, Nigeria
O. S.
Ohunakin
The Energy and Environment Research Group (TEERG), Mechanical Engineering Department, Covenant University, Ogun State, Nigeria
Oluseyi O.
Ajayi
Mechanical Engineering Department, Covenant University, P.M.B. 1023, Ota, Nigeria
P. O.
Babalola
Mechanical Engineering Department, Covenant University, Ota, Nigeria
O.
Kilanko
Mechanical Engineering Department, Covenant University, Ota, Nigeria
A. D.
Oyegbile
Mechanical Engineering Department, Covenant University, Ota, Nigeria
D.
Lawson-Jack
Mechanical Engineering Department, Covenant University, Ota, Nigeria
cooling capacity
refrigeration system
COP
refrigerant charge
capillary tube length
power consumption
A comparative experimental study on the performance of a domestic refrigerator using R600A and LPG with a varying refrigerant charge (wr) and capillary tube length (L) was carried out. The enthalpy of the refrigerants R600A and LPG for each data set for the experimental conditions were obtained by using REFPROP soft ware (version 9.0). The results show that the design temperature and pull-down time set by ISO for a small refrigerator are achieved earlier using refrigerant charge
60 g of LPG with a 1.5 m capillary tube length. The highest COP (4.8) was obtained using 60-g charge of LPG with L of 1.5-m. The average COP obtained using LPG was 1.14% higher than that of R600A. Based on the result of electric power consumption, R600A offered lowest power
consumption. The compressor consumed 20% less power compared to LPG in the system. The system performed best with LPG in terms of COP and cooling capacity, while in terms of power consumption R600A performed best.
INFLUENCE OF VACUUM LEVEL AND SEA WATER SALINITY ON THE VACUUM DISTILLER ENERGY EFFICIENCY
303-317
10.1615/InterJEnerCleanEnv.2018025032
Evgeny V.
Blagin
S.P. Korolev Samara National Research University, 34 Moskovskoe Highway,
Samara, 443086, Russia
Alexey A.
Gorshkalev
S.P. Korolev Samara National Research University, 34 Moskovskoe Highway,
Samara, 443086, Russia
A. A.
Shimanov
S.P. Korolev Samara National Research University, 34 Moskovskoe Highway,
Samara, 443086, Russia
vacuum desalter
vacuum level
steam compressor
vaporizer
condenser
unit of water steam ejection
heat exchanger
heater
The need in fresh water for drinking and industrial applications is increased permanently. This challenge can be solved by using sea water desalination. One of the most popular methods of desalination of large volumes of water is a vacuum distillation technology. However, vacuum
desalters need the optimization of their design and/or operation. The desalters' optimization is carried out with account for many different parameters that affect their efficiency. The purpose of the present work is a preliminary analysis of the influence exerted by the internal distiller vacuum level and by the salt concentration in sea water on the operation of the main distiller's construction
units. It is shown that an increase in the vacuum level worsens the operation of steam compressor and of water ejection unit. Pressure reduction improves the performance of the heater unit, and it does not affect the vaporizer unit operation. An increase in the sea water salinity
worsens the operation of the unit and vaporizer. It does not influence the performance of other desalter units.
MATHEMATICAL MODEL FOR PREDICTING LIMESTONE ENRICHMENT INDICATORS
319-333
10.1615/InterJEnerCleanEnv.2018021634
Petr I.
Pilov
National Mining University of Ukraine, 19 Karl Marx Ave., Dnepropetrovsk, 49027, Ukraine
A. S.
Dreshpak
National Mining University of Ukraine, 19 Karl Marx Ave., Dnepropetrovsk,
49027, Ukraine
efficiency
mathematical model
prediction
limestone
raw material enrichment
regression analysis
carbonate deposit
A mathematical model for predicting enrichment indicators of raw materials of heterogeneous carbonate deposits on the basis of a regression analysis has been constructed. This model takes into account the stochastic link between the limestone mass fraction and rock particle sizes. The calculating methodology of optimal separation of particle sizes in the process of screening has been developed. The processing mode optimization has provided an increase in the raw material enrichment efficiency as well as the improvement of the regional ecological situation.
EXPERIMENTAL INVESTIGATION OF PREMIXED AIR–FUEL MIXTURES AND OF THE COMBUSTION SPECIFICS OF DIFFUSION FUEL JETS
335-348
10.1615/InterJEnerCleanEnv.2018021223
Alexander Igorevich
Guryanov
General and Technical Physics Department, Soloviev Rybinsk State Aviation
Technical University, 53 Pushkin Str., Rybinsk, 152934, Russia
Oleg A.
Evdokimov
General and Technical Physics Department, Soloviev Rybinsk State Aviation
Technical University, 53 Pushkin Str., Rybinsk, 152934, Russia
Sergey V.
Veretennikov
General and Technical Physics Department, Soloviev Rybinsk State Aviation
Technical University, 53 Pushkin Str., Rybinsk, 152934, Russia
M. M.
Guryanova
Rybinsk State Aviation Technical University named after P.A.Solovyov,
Rybinsk, Russia
fuel jet
premixed mixture
lean mixture
combustion
oxidizer excess ratio
combustion completeness
efficiency
swirling flow
Investigations were carried out of combustion of premixed air–fuel mixtures and of diffusion fuel jets. Dependences of combustion process parameters on Reynolds number, air–fuel ratio, and the length of combustion zone have been obtained. Investigations were carried out for swirling and nonswirling flows, with cocurrent and countercurrent flows of fuel and oxidizer. Combustion parameters were investigated on fuel ejection into the mixing area with swirling flow of the main
air supply. The method of "lean" mixture (1.8 ≤ α ≤ 2.3) combustion at low pressure gradient countercurrent flow is described. The method provides combustion of fuel with high efficiency and low emissions of NOx and CO.
ACTUATION ALGORITHM OF THE AUTONOMOUS PASSIVE RESIDUAL HEAT REMOVAL THERMOSIPHON SYSTEM FOR WWER REACTORS
349-363
10.1615/InterJEnerCleanEnv.2018025342
Igor
Sviridenko
Sevastopol State University, Sevastopol, Russia
WWER
passive residual heat removal system
actuation algorithm
emergency heat exchanger
intermediate cooling circuit
two-phase thermosiphon
The basic precondition for operation of the passive residual heat removal system (PRHRS) is its passive actuation in conditions of blackout transient of nuclear power plants (NPP) to ensure the safety of the reactor. Following the blackout, which is an initiating event, actuation of the PRHRS should be based on natural phenomena, independent of the availability of the external power and/or operator's intervention. The article deals with the actuation algorithm of the passive residual heat removal system of the water–water energy reactor (WWER). The main feature of the system
under consideration is the organization of the residual heat removal directly from the primary circuit (PRHRS-R). PRHRS-R is autonomous, consequently its operation does not depend on
the condition and availability of the principal equipment of the reactor island – the steam generators (SG). For residual heat removal the PRHRS-R is equipped with heat exchangers composed of a closed-cycle evaporation–condensation devices − two-phase thermosiphons (TPTS). The use of TPTS provides an efficient heat sink and a reliable separation of the primary circuit and of the final heat absorber. The PRHRS-R connection to the reactor installation is presented,
the main stages of passive actuation of the system are considered and analyzed. The evaluation of the heat removal efficiency of PRHRS-R and the duration of the corresponding stages of its commissioning is based on the results of analytical modeling using RELAP5/Mod3.4 Code. The
actuation of the PRHRS-R is compared with the actuation of the PRHRS-SG of the state of the art WWER Generation 3+ designs, where the passive removal of residual heat is carried out through the secondary side.
BIONIC SHARK FIN COMBINED AIRFOIL BLADE OPTIMAL DESIGN AND NUMERICAL SIMULATION OF HORIZONTAL AXIS TIDAL CURRENT TURBINE
365-385
10.1615/InterJEnerCleanEnv.2018021143
Kaisheng
Zhang
Department of Mechatronics Engineering, College of Engineering, Ocean
University of China, Qingdao, China
Qingbiao
Zou
Department of Mechatronics Engineering, College of Engineering, Ocean
University of China, QingDao, China
Ya
Wang
Department of Mechatronics Engineering, College of Engineering, Ocean
University of China, QingDao, China
Baocheng
Zhang
Department of Mechatronics Engineering, College of Engineering, Ocean
University of China, Qingdao, China
tidal current turbine
bionic blade
combined airfoil
hydrodynamic performance
NACA airfoils are mostly used currently in turbine blades mainly in the aviation field, causing the low efficiency of the turbine. To improve the efficiency, in this paper, the shark caudal fin airfoils with good hydrodynamic performance were selected from the perspective of bionics. According to
the characteristics of the lower edge of the shark caudal fin and the radius of curvature of the upper edge of NACA airfoil, a new airfoil was designed that combined the lower edge of shark caudal fin and the upper edge of NACA airfoil and, on this basis, a composite airfoil blade and a turbine
model were designed. The high efficiency of the turbine was verified by numerical simulation. The design method is verified to be more suitable for the working environment, and provides a new method for the design of the horizontal axis turbine blade.
TRANSIENT COLD FLOW SIMULATION OF A MOVING BED AIR REACTOR FOR CHEMICAL LOOPING COMBUSTION
387-399
10.1615/InterJEnerCleanEnv.2018024331
Mengqiao
Yang
Department of Mechanical Engineering and Materials Science, Washington
University in St. Louis, St. Louis, MO, USA
Ramesh K.
Agarwal
Department of Mechanical Engineering and Materials Science, Washington
University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130
chemical looping combustion
cross flow moving bed
DEM
cold flow simulation
pressure drop
Circulating fluidized bed (CFB) in chemical looping combustion (CLC) is a recent technology that provides a great advantage for gas–solid interaction and efficiency. In order to obtain a thorough understanding of this technology and to assess its effectiveness for industrial-scale deployment, numerical simulations are conducted. Computational Fluid Dynamics (CFD) simulations are performed
with Discrete Element Method (DEM) to simulate gas–solid interactions. CFD commercial soft ware ANSYS Fluent is used for the purpose. Low-grade iron is used as the bed material in studying the hydrodynamics and particle behavior in a cross flow moving bed in an air reactor corresponding to the experimental setup. The simulation shows satisfactory agreement with the experimental data for total pressure drop between the gas inlet and outlet. The simulation results
offer a physical understanding of the pressure drop and particle velocity distribution at different heights in the reactor. The simulations demonstrate the ability of CFD/DEM to accurately capture the physics of the CFB-based CLC process.
INDEX VOLUME 18
401-404
10.1615/InterJEnerCleanEnv.v18.i4.80