The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
Il Moon - One of the best experts on this subject based on the ideXlab platform.
-
comparison of Multistage Compression configurations for single mixed refrigerant processes
Industrial & Engineering Chemistry Research, 2015Co-Authors: Hweeung Kwon, Daeho Ko, Il MoonAbstract:This study investigates the effects of Multistage Compression on single mixed refrigerant processes in terms of specific work. Comparison of specific work published in the literature is not straightforward due to the variety of Compression configurations and the design bases. Therefore, four configurations (two-, three-, and four-stage and pump-added three-stage Compressions) along with three natural gas compositions were considered. To compare with the simulation and optimization results in the literature, these 12 cases, having the same design basis, were optimized by adjusting the optimization variables such as the flow rate and composition of the refrigerant, the Compression ratio of each compressor, the inlet pressure of the first compressor, and the outlet temperatures of the hot and cold refrigerant streams. There were two important findings: (1) adding a pump reduces specific work more than adding a compressor or decreasing the minimum temperature difference value in the compressors; (2) among the...
-
Comparison of Multistage Compression Configurations for Single Mixed Refrigerant Processes
Industrial and Engineering Chemistry Research, 2015Co-Authors: K. Tak, Hweeung Kwon, Junghwan Kim, Inkyu Lee, Daeho Ko, Il MoonAbstract:This study investigates the effects of Multistage Compression on single mixed refrigerant processes in terms of specific work. Comparison of specific work published in the literature is not straightforward due to the variety of Compression configurations and the design bases. Therefore, four configurations (two-, three-, and four-stage and pump-added three-stage Compressions) along with three natural gas compositions were considered. To compare with the simulation and optimization results in the literature, these 12 cases, having the same design basis, were optimized by adjusting the optimization variables such as the flow rate and composition of the refrigerant, the Compression ratio of each compressor, the inlet pressure of the first compressor, and the outlet temperatures of the hot and cold refrigerant streams. There were two important findings: (1) adding a pump reduces specific work more than adding a compressor or decreasing the minimum temperature difference value in the compressors; (2) among the four configurations, the refrigerant composition does not significantly change, although it greatly affects the efficiency. The former results from the compressor constraint of the gaseous inlet and the latter from the minimum temperature constraint of the multistream heat exchanger. Furthermore, direct comparisons to other studies were also performed showing the importance of optimization and the effect of the design basis. 1.
Norbert Müller - One of the best experts on this subject based on the ideXlab platform.
-
using water vapor as refrigerant in Multistage variable speed turbo compressor to improve seasonal energy efficiency ratio of air conditioning
International Journal of Air-conditioning and Refrigeration, 2011Co-Authors: Qubo Li, Demiss A Amibe, Norbert MüllerAbstract:An air conditioning system using water as refrigerant (R718) that compresses water vapor with Multistage stage variable speed axial compressor with intercooling between stages by water injection is considered. Four stage Compression with flash intercooling resulted in 50% improvement of coefficient of performance (COP) at full load compared to conventional refrigerants like R134a. The energy efficiency of an air conditioning unit is specified by seasonal energy efficiency ratio (SEER). SEER is defined as the ratio of cooling output of an air conditioner measured and electrical energy consumption as per AHRI 210/240 during cooling season. The SEER is computed after determining the evaporator cooling capacity and the electrical energy demand of the compressor at each bin temperature using assumed compressor isentropic efficiency, mechanical efficiency and electrical efficiency and multiplying by the weight of each bin temperature to determine the total for the cooling season. As a result of Multistage Compression, best part load performance of water as a refrigerant and operation of compressor near design point at part load due to variable speed drive, 50%–60% improvement in SEER is obtained compared to the best available in the market using conventional refrigerants such as R134a with single stage Compression.
Hweeung Kwon - One of the best experts on this subject based on the ideXlab platform.
-
comparison of Multistage Compression configurations for single mixed refrigerant processes
Industrial & Engineering Chemistry Research, 2015Co-Authors: Hweeung Kwon, Daeho Ko, Il MoonAbstract:This study investigates the effects of Multistage Compression on single mixed refrigerant processes in terms of specific work. Comparison of specific work published in the literature is not straightforward due to the variety of Compression configurations and the design bases. Therefore, four configurations (two-, three-, and four-stage and pump-added three-stage Compressions) along with three natural gas compositions were considered. To compare with the simulation and optimization results in the literature, these 12 cases, having the same design basis, were optimized by adjusting the optimization variables such as the flow rate and composition of the refrigerant, the Compression ratio of each compressor, the inlet pressure of the first compressor, and the outlet temperatures of the hot and cold refrigerant streams. There were two important findings: (1) adding a pump reduces specific work more than adding a compressor or decreasing the minimum temperature difference value in the compressors; (2) among the...
-
Comparison of Multistage Compression Configurations for Single Mixed Refrigerant Processes
Industrial and Engineering Chemistry Research, 2015Co-Authors: K. Tak, Hweeung Kwon, Junghwan Kim, Inkyu Lee, Daeho Ko, Il MoonAbstract:This study investigates the effects of Multistage Compression on single mixed refrigerant processes in terms of specific work. Comparison of specific work published in the literature is not straightforward due to the variety of Compression configurations and the design bases. Therefore, four configurations (two-, three-, and four-stage and pump-added three-stage Compressions) along with three natural gas compositions were considered. To compare with the simulation and optimization results in the literature, these 12 cases, having the same design basis, were optimized by adjusting the optimization variables such as the flow rate and composition of the refrigerant, the Compression ratio of each compressor, the inlet pressure of the first compressor, and the outlet temperatures of the hot and cold refrigerant streams. There were two important findings: (1) adding a pump reduces specific work more than adding a compressor or decreasing the minimum temperature difference value in the compressors; (2) among the four configurations, the refrigerant composition does not significantly change, although it greatly affects the efficiency. The former results from the compressor constraint of the gaseous inlet and the latter from the minimum temperature constraint of the multistream heat exchanger. Furthermore, direct comparisons to other studies were also performed showing the importance of optimization and the effect of the design basis. 1.
Daeho Ko - One of the best experts on this subject based on the ideXlab platform.
-
comparison of Multistage Compression configurations for single mixed refrigerant processes
Industrial & Engineering Chemistry Research, 2015Co-Authors: Hweeung Kwon, Daeho Ko, Il MoonAbstract:This study investigates the effects of Multistage Compression on single mixed refrigerant processes in terms of specific work. Comparison of specific work published in the literature is not straightforward due to the variety of Compression configurations and the design bases. Therefore, four configurations (two-, three-, and four-stage and pump-added three-stage Compressions) along with three natural gas compositions were considered. To compare with the simulation and optimization results in the literature, these 12 cases, having the same design basis, were optimized by adjusting the optimization variables such as the flow rate and composition of the refrigerant, the Compression ratio of each compressor, the inlet pressure of the first compressor, and the outlet temperatures of the hot and cold refrigerant streams. There were two important findings: (1) adding a pump reduces specific work more than adding a compressor or decreasing the minimum temperature difference value in the compressors; (2) among the...
-
Comparison of Multistage Compression Configurations for Single Mixed Refrigerant Processes
Industrial and Engineering Chemistry Research, 2015Co-Authors: K. Tak, Hweeung Kwon, Junghwan Kim, Inkyu Lee, Daeho Ko, Il MoonAbstract:This study investigates the effects of Multistage Compression on single mixed refrigerant processes in terms of specific work. Comparison of specific work published in the literature is not straightforward due to the variety of Compression configurations and the design bases. Therefore, four configurations (two-, three-, and four-stage and pump-added three-stage Compressions) along with three natural gas compositions were considered. To compare with the simulation and optimization results in the literature, these 12 cases, having the same design basis, were optimized by adjusting the optimization variables such as the flow rate and composition of the refrigerant, the Compression ratio of each compressor, the inlet pressure of the first compressor, and the outlet temperatures of the hot and cold refrigerant streams. There were two important findings: (1) adding a pump reduces specific work more than adding a compressor or decreasing the minimum temperature difference value in the compressors; (2) among the four configurations, the refrigerant composition does not significantly change, although it greatly affects the efficiency. The former results from the compressor constraint of the gaseous inlet and the latter from the minimum temperature constraint of the multistream heat exchanger. Furthermore, direct comparisons to other studies were also performed showing the importance of optimization and the effect of the design basis. 1.
Qubo Li - One of the best experts on this subject based on the ideXlab platform.
-
using water vapor as refrigerant in Multistage variable speed turbo compressor to improve seasonal energy efficiency ratio of air conditioning
International Journal of Air-conditioning and Refrigeration, 2011Co-Authors: Qubo Li, Demiss A Amibe, Norbert MüllerAbstract:An air conditioning system using water as refrigerant (R718) that compresses water vapor with Multistage stage variable speed axial compressor with intercooling between stages by water injection is considered. Four stage Compression with flash intercooling resulted in 50% improvement of coefficient of performance (COP) at full load compared to conventional refrigerants like R134a. The energy efficiency of an air conditioning unit is specified by seasonal energy efficiency ratio (SEER). SEER is defined as the ratio of cooling output of an air conditioner measured and electrical energy consumption as per AHRI 210/240 during cooling season. The SEER is computed after determining the evaporator cooling capacity and the electrical energy demand of the compressor at each bin temperature using assumed compressor isentropic efficiency, mechanical efficiency and electrical efficiency and multiplying by the weight of each bin temperature to determine the total for the cooling season. As a result of Multistage Compression, best part load performance of water as a refrigerant and operation of compressor near design point at part load due to variable speed drive, 50%–60% improvement in SEER is obtained compared to the best available in the market using conventional refrigerants such as R134a with single stage Compression.
-
multi stage variable speed turbo compressor for enhancing seasonal energy efficiency ratio of air conditioners using r718 as refrigerant
Volume 5: Industrial and Cogeneration; Microturbines and Small Turbomachinery; Oil and Gas Applications; Wind Turbine Technology, 2010Co-Authors: Demiss A Amibe, Qubo Li, Norbert Mu LlerAbstract:An air conditioning system using water as refrigerant (R718) that compresses water vapor with Multistage stage variable speed axial compressor with intercooling between stages by water injection is considered. Four stage Compression with flash intercooling resulted in 50% improvement of coefficient of performance (COP) at full load compared to conventional refrigerants like R134a. The energy-efficiency of an air conditioning unit is specified by seasonal energy efficiency ratio (SEER). SEER is defined as the ratio of cooling output of an air conditioner measured and electrical energy consumption as per AHRI 210/240 during cooling season. The SEER is computed after determining the evaporator cooling capacity and the electrical energy demand of the compressor at each bin temperature using assumed compressor isentropic efficiency, mechanical efficiency and electrical efficiency and multiplying by the weight of each bin temperature to determine the total for the cooling season. As a result of Multistage Compression, best part load performance of water as a refrigerant and operation of compressor near design point at part load due to variable speed drive, 50–60% improvement in SEER is obtained compared to the best available in the market using conventional refrigerants such as R134a with single stage Compression.Copyright © 2010 by ASME
