The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Damola S Adelekan - One of the best experts on this subject based on the ideXlab platform.
-
artificial neural network approach for Irreversibility performance analysis of domestic refrigerator by utilizing lpg with tio2 lubricant as replacement of r134a
International Journal of Refrigeration-revue Internationale Du Froid, 2018Co-Authors: Jatinder Gill, Olayinka S. Ohunakin, Jagdev Singh, Damola S AdelekanAbstract:Abstract This paper experimentally investigated Irreversibility performance analysis of domestic refrigerator using 40 g, 50 g, 60 g and 70 g of LPG refrigerant with varying concentration of TiO2 nanoparticles dispersed in a mineral oil lubricant as replacement of R134a. The Irreversibility performance analysis of the domestic refrigerator investigated with test parameters including Irreversibility in the components, total Irreversibility, and second law efficiency. Findings showed that under similar operating conditions irreversibilities in condenser, capillary tube, evaporator and compressor of the domestic refrigerator using LPG refrigerant with lubricant TiO2–mineral oil found lower than R134a by 6.05–48.10%, 17.83–46.98%, 2.51–33.17% and 2.21–23.29% respectively. Additionally, total Irreversibility and second law efficiency in the domestic refrigerator using LPG refrigerant with TiO2, nanoparticles dispersed in a mineral oil lubricant found lower and higher than R134a by around 0.65–35.97% and 6.23–54.74% respectively. All in all 0.4 g L−1 of TiO2 and 40 g of LPG charge were the attained optimal values of nanoparticle concentration and LPG charge respectively in the domestic refrigerator utilizing LPG as replacement of R134a. Artificial Neural Networks (ANN) approach to delineate total Irreversibility and second law efficiency of the domestic refrigerator was additionally applied to develop the models. It found that ANN models predictions concurred well with experimental results and brought out an absolute fraction of variance of (0.989–0.990), root mean square error of (0.831–1.061) and mean absolute percentage error of (1.734–2.056%) respectively with experimental results.
-
Artificial neural network approach for Irreversibility performance analysis of domestic refrigerator by utilizing LPG with TiO2–lubricant as replacement of R134a
International Journal of Refrigeration-revue Internationale Du Froid, 2018Co-Authors: Jatinder Gill, Olayinka S. Ohunakin, Jagdev Singh, Damola S AdelekanAbstract:Abstract This paper experimentally investigated Irreversibility performance analysis of domestic refrigerator using 40 g, 50 g, 60 g and 70 g of LPG refrigerant with varying concentration of TiO2 nanoparticles dispersed in a mineral oil lubricant as replacement of R134a. The Irreversibility performance analysis of the domestic refrigerator investigated with test parameters including Irreversibility in the components, total Irreversibility, and second law efficiency. Findings showed that under similar operating conditions irreversibilities in condenser, capillary tube, evaporator and compressor of the domestic refrigerator using LPG refrigerant with lubricant TiO2–mineral oil found lower than R134a by 6.05–48.10%, 17.83–46.98%, 2.51–33.17% and 2.21–23.29% respectively. Additionally, total Irreversibility and second law efficiency in the domestic refrigerator using LPG refrigerant with TiO2, nanoparticles dispersed in a mineral oil lubricant found lower and higher than R134a by around 0.65–35.97% and 6.23–54.74% respectively. All in all 0.4 g L−1 of TiO2 and 40 g of LPG charge were the attained optimal values of nanoparticle concentration and LPG charge respectively in the domestic refrigerator utilizing LPG as replacement of R134a. Artificial Neural Networks (ANN) approach to delineate total Irreversibility and second law efficiency of the domestic refrigerator was additionally applied to develop the models. It found that ANN models predictions concurred well with experimental results and brought out an absolute fraction of variance of (0.989–0.990), root mean square error of (0.831–1.061) and mean absolute percentage error of (1.734–2.056%) respectively with experimental results.
Gulshan Sachdeva - One of the best experts on this subject based on the ideXlab platform.
-
thermodynamic performance analysis of a vapor compression absorption cascaded refrigeration system
Energy Conversion and Management, 2013Co-Authors: Vaibhav Jain, Surendra Singh Kachhwaha, Gulshan SachdevaAbstract:Abstract In the present study, a thermodynamic model for cascaded vapor compression–absorption system (CVCAS) has been developed which consists of a vapor compression refrigeration system (VCRS) coupled with single effect vapor absorption refrigeration system (VARS). Based on first and second laws, a comparative performance analysis of CVCAS and an independent VCRS has been carried out for a design capacity of 66.67 kW. The results show that the electric power consumption in CVCAS is reduced by 61% and COP of compression section is improved by 155% with respect to the corresponding values pertaining to a conventional VCRS. However there is a trade-off between these parameters and the rational efficiency which is found to decrease to half of that for a VCRS. The effect of various operating parameters, i.e., superheating, subcooling, cooling capacity, inlet temperature and the product of effectiveness and heat capacitance of external fluids are extensively studied on the COP, total Irreversibility and rational efficiency of the CVCAS. Besides, the performance of environment friendly refrigerants such as R410A, R407C and R134A is found to be almost at par with that of R22. Hence, all the alternative refrigerants selected herein can serve as potential substitutes for R22. Furthermore, it has been found that reducing the Irreversibility rate of the condenser by one unit due to decrease in condenser temperature depicted approximately 3.8 times greater reduction in the total Irreversibility rate of the CVCAS, whereas unit reduction in the evaporator’s Irreversibility rate due to increase in evaporator temperature reduced total Irreversibility rate by 3.4 times for the same system. Since the changes in the inlet temperatures of external fluid in the condenser and the evaporator contribute significant changes in system’s overall Irreversibility, due consideration is required in condenser and evaporator temperatures to improve the system performance.
Ali Kilicarslan - One of the best experts on this subject based on the ideXlab platform.
-
energy and Irreversibility analysis of a cascade refrigeration system for various refrigerant couples
Energy Conversion and Management, 2010Co-Authors: Ali Kilicarslan, Murat HosozAbstract:Abstract This study deals with energy and Irreversibility analysis of a cascade refrigeration system employing various refrigerant couples, namely R152a–R23, R290–R23, R507–R23, R234a–R23, R717–R23 and R404a–R23, using a computer code developed for this aim. It is assumed that the refrigeration load is 1 kW, the refrigerated space temperature is −40 °C, and the environment temperature is 300 K, while the degrees of condenser subcooling and evaporator superheat are 5 and 7 °C, respectively, for all cases. Furthermore, the polytropic efficiencies of the compressors are assumed to be equal. It has been determined that the COP of the cascade refrigeration system increases and the Irreversibility decreases with rising evaporator temperature and polytropic efficiency for all studied refrigerant couples. On the other hand, the COP of the cascade refrigeration system decreases and the Irreversibility increases on increasing the condenser temperature and the difference between the saturation temperatures of the lower and higher temperature systems in the heat exchanger (ΔT). In all cases, the refrigerant couple R717–R23 has the highest COP and lowest Irreversibility except for the limited ranges of polytropic efficiency (50–60%) and ΔT (13 K–16 K), while R507–R23 has the lowest COP and highest Irreversibility. The refrigerant couple R152a–R23 has been found to be an alternative couple to R717–R23 for the above mentioned ranges of polytropic efficiency and ΔT. The refrigerant couples R134a–R23 and R290–R23 have placed in the middle range, and R404a–R23 can be considered as a replacement couple for R507–R23 in all cases.
-
Investigation of irreversibilities in the compression process for alternative refrigerants in a vapor compression refrigeration cycle
Volume 15: Sustainable Products and Processes, 2007Co-Authors: Ali Kilicarslan, Norbert MüllerAbstract:Irreversibility analyses during compression process are presented for some refrigerants namely, R290, R134a, R12, R22, and R152a in a vapor compression refrigeration cycle. The effects of evaporator temperature, condenser temperature and isentropic efficiency on the Irreversibility rates and exergetic efficiencies of the refrigerants under study are investigated By the means of a computer code that simulates a vapor compression cycle including subcooling and superheating. For all the refrigerants in this study, the Irreversibility in the compression process decreased as the evaporator temperature and isentropic efficiency increased and it increased with the increasing values of the condenser temperatures. Exergetic efficiency of the compressor increased as the isentropic efficiency of the compressor increased while it decreased with the increasing values of evaporator temperatures. In the case of increasing evaporator and condenser temperatures, and isentropic efficiency values, R22 and R152a approximately show the same and lowest values of compressor Irreversibility while R290 has the lowest values. The compressor irreversibilities and compressor exergetic efficiencies of R12 and R134a placed in the moderate range in the case of increasing evaporator and condenser temperatures, and isentropic efficiency values.Copyright © 2007 by ASME
Zhang Shigang - One of the best experts on this subject based on the ideXlab platform.
-
General thermodynamic performance of irreversible absorption heat pump
Energy Conversion and Management, 2011Co-Authors: Zhao Xiling, Fu Lin, Zhang ShigangAbstract:The absorption heat pump (AHP) was studied with thermodynamics. A four reservoirs model of absorption heat pump was established considering the heat resistance, heat leak and the internal Irreversibility. The reasonable working regions, the performance effects of Irreversibility, heat leak and the correlation of four components were studied. When studying the effects of internal Irreversibility, two internal Irreversibility parameters (I he for generator-absorber assembly and Ire for evaporator-condenser assembly) were introduced to distinguish the different effects. When studying the heat transfer relations of four components, a universal relationship between the main parameters were deduced. The results which have more realized meaning show that, the reduction of the friction, heat loss, and internal dissipations of the evaporator-condenser assembly are more important than its reduction of generator-absorber assembly, and lessening the heat leak of generator are more important than its reduction of other components to improve the AHP performance. ?? 2010 Elsevier Ltd. All rights reserved.
Jatinder Gill - One of the best experts on this subject based on the ideXlab platform.
-
artificial neural network approach for Irreversibility performance analysis of domestic refrigerator by utilizing lpg with tio2 lubricant as replacement of r134a
International Journal of Refrigeration-revue Internationale Du Froid, 2018Co-Authors: Jatinder Gill, Olayinka S. Ohunakin, Jagdev Singh, Damola S AdelekanAbstract:Abstract This paper experimentally investigated Irreversibility performance analysis of domestic refrigerator using 40 g, 50 g, 60 g and 70 g of LPG refrigerant with varying concentration of TiO2 nanoparticles dispersed in a mineral oil lubricant as replacement of R134a. The Irreversibility performance analysis of the domestic refrigerator investigated with test parameters including Irreversibility in the components, total Irreversibility, and second law efficiency. Findings showed that under similar operating conditions irreversibilities in condenser, capillary tube, evaporator and compressor of the domestic refrigerator using LPG refrigerant with lubricant TiO2–mineral oil found lower than R134a by 6.05–48.10%, 17.83–46.98%, 2.51–33.17% and 2.21–23.29% respectively. Additionally, total Irreversibility and second law efficiency in the domestic refrigerator using LPG refrigerant with TiO2, nanoparticles dispersed in a mineral oil lubricant found lower and higher than R134a by around 0.65–35.97% and 6.23–54.74% respectively. All in all 0.4 g L−1 of TiO2 and 40 g of LPG charge were the attained optimal values of nanoparticle concentration and LPG charge respectively in the domestic refrigerator utilizing LPG as replacement of R134a. Artificial Neural Networks (ANN) approach to delineate total Irreversibility and second law efficiency of the domestic refrigerator was additionally applied to develop the models. It found that ANN models predictions concurred well with experimental results and brought out an absolute fraction of variance of (0.989–0.990), root mean square error of (0.831–1.061) and mean absolute percentage error of (1.734–2.056%) respectively with experimental results.
-
Artificial neural network approach for Irreversibility performance analysis of domestic refrigerator by utilizing LPG with TiO2–lubricant as replacement of R134a
International Journal of Refrigeration-revue Internationale Du Froid, 2018Co-Authors: Jatinder Gill, Olayinka S. Ohunakin, Jagdev Singh, Damola S AdelekanAbstract:Abstract This paper experimentally investigated Irreversibility performance analysis of domestic refrigerator using 40 g, 50 g, 60 g and 70 g of LPG refrigerant with varying concentration of TiO2 nanoparticles dispersed in a mineral oil lubricant as replacement of R134a. The Irreversibility performance analysis of the domestic refrigerator investigated with test parameters including Irreversibility in the components, total Irreversibility, and second law efficiency. Findings showed that under similar operating conditions irreversibilities in condenser, capillary tube, evaporator and compressor of the domestic refrigerator using LPG refrigerant with lubricant TiO2–mineral oil found lower than R134a by 6.05–48.10%, 17.83–46.98%, 2.51–33.17% and 2.21–23.29% respectively. Additionally, total Irreversibility and second law efficiency in the domestic refrigerator using LPG refrigerant with TiO2, nanoparticles dispersed in a mineral oil lubricant found lower and higher than R134a by around 0.65–35.97% and 6.23–54.74% respectively. All in all 0.4 g L−1 of TiO2 and 40 g of LPG charge were the attained optimal values of nanoparticle concentration and LPG charge respectively in the domestic refrigerator utilizing LPG as replacement of R134a. Artificial Neural Networks (ANN) approach to delineate total Irreversibility and second law efficiency of the domestic refrigerator was additionally applied to develop the models. It found that ANN models predictions concurred well with experimental results and brought out an absolute fraction of variance of (0.989–0.990), root mean square error of (0.831–1.061) and mean absolute percentage error of (1.734–2.056%) respectively with experimental results.