The Experts below are selected from a list of 1818 Experts worldwide ranked by ideXlab platform
Ma Guoyuan - One of the best experts on this subject based on the ideXlab platform.
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working performance of r 32 two Stage Compression system in domestic air conditioner
Energy and Buildings, 2015Co-Authors: Xu Shuxue, Ma GuoyuanAbstract:Abstract A numerical simulation model of a two-Stage Compression refrigeration system with vapor injection using R-32 as refrigeration is newly presented in this paper. The middle chamber state of the twin rotary compressor with vapor injection was simulated. Based on that, the whole system model was set up and it was validated by comparing the predictions with measured data. The results show that, compared with No-injection cycle, R-32 vapor injection system provides very significant performance improvements for cooling performance. The most suitable volume ratio of the high-pressure cylinder to low-pressure is between 0.65 and 0.78; Compared with the single-Stage Compression system, the cooling capacity and COP of the two-Stage Compression system can improve 5–15% and 10–12%, respectively; The optimum vapor injection pressure corresponding to the comprehensive cooling performance was 1.3–1.8 MPa.
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experimental study on two Stage Compression refrigeration heat pump system with dual cylinder rolling piston compressor
Applied Thermal Engineering, 2014Co-Authors: Xu Shuxue, Ma GuoyuanAbstract:Abstract A thermodynamically analytical model on the two-Stage Compression refrigeration/heat pump system with vapor injection was derived. The optimal volume ratio of the high-pressure cylinder to the low-pressure one has been discussed under both cooling and heating conditions. Based on the above research, the prototype was developed and its experimental setup established. A comprehensive experiments for the prototype have been conducted, and the results show that, compared with the single-Stage Compression heat pump system, the cooling capacity and cooling COP can increase 5%–15% and 10–12%, respectively. Also, the heating capacity with the evaporating temperature ranging from 0.3 to 3 °C is 92–95% of that under the rate condition with the evaporating temperature of 7 °C, and 58% when the evaporation temperature is between −28 °C and −24 °C.
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Experimental study on two-Stage Compression refrigeration/heat pump system with dual-cylinder rolling piston compressor
Applied Thermal Engineering, 2014Co-Authors: Xu Shuxue, Ma GuoyuanAbstract:Abstract A thermodynamically analytical model on the two-Stage Compression refrigeration/heat pump system with vapor injection was derived. The optimal volume ratio of the high-pressure cylinder to the low-pressure one has been discussed under both cooling and heating conditions. Based on the above research, the prototype was developed and its experimental setup established. A comprehensive experiments for the prototype have been conducted, and the results show that, compared with the single-Stage Compression heat pump system, the cooling capacity and cooling COP can increase 5%–15% and 10–12%, respectively. Also, the heating capacity with the evaporating temperature ranging from 0.3 to 3 °C is 92–95% of that under the rate condition with the evaporating temperature of 7 °C, and 58% when the evaporation temperature is between −28 °C and −24 °C.
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exergy analysis for quasi two Stage Compression heat pump system coupled with ejector
Experimental Thermal and Fluid Science, 2011Co-Authors: Xu Shuxue, Ma GuoyuanAbstract:Abstract Ejectors are simple mechanical components, can utilize high pressure energy from liquid in the quasi two-Stage Compression heat pump system coupled with scroll compressor, and the performance of the heat pump system can be further improved. According to thermal analysis model based on the first and second law of thermodynamics, the heat pump prototype has been developed and comprehensively tested, the influence of ejector on the heat pump system was exergetically analyzed using experimental data of the prototype. The results show that, compressor has the greatest exergy loss, amounts to about 77% of the total exergy; ejector can recover the fluid pressure exergy in supplementary circuit compared with the throttling element in the quasi two-Stage Compression heat pump system, decreases the exergy loss of compressor; and the exergetic efficiency can be improved about 3–5%, while the exergy output remains nearly constant.
Xu Shuxue - One of the best experts on this subject based on the ideXlab platform.
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working performance of r 32 two Stage Compression system in domestic air conditioner
Energy and Buildings, 2015Co-Authors: Xu Shuxue, Ma GuoyuanAbstract:Abstract A numerical simulation model of a two-Stage Compression refrigeration system with vapor injection using R-32 as refrigeration is newly presented in this paper. The middle chamber state of the twin rotary compressor with vapor injection was simulated. Based on that, the whole system model was set up and it was validated by comparing the predictions with measured data. The results show that, compared with No-injection cycle, R-32 vapor injection system provides very significant performance improvements for cooling performance. The most suitable volume ratio of the high-pressure cylinder to low-pressure is between 0.65 and 0.78; Compared with the single-Stage Compression system, the cooling capacity and COP of the two-Stage Compression system can improve 5–15% and 10–12%, respectively; The optimum vapor injection pressure corresponding to the comprehensive cooling performance was 1.3–1.8 MPa.
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experimental study on two Stage Compression refrigeration heat pump system with dual cylinder rolling piston compressor
Applied Thermal Engineering, 2014Co-Authors: Xu Shuxue, Ma GuoyuanAbstract:Abstract A thermodynamically analytical model on the two-Stage Compression refrigeration/heat pump system with vapor injection was derived. The optimal volume ratio of the high-pressure cylinder to the low-pressure one has been discussed under both cooling and heating conditions. Based on the above research, the prototype was developed and its experimental setup established. A comprehensive experiments for the prototype have been conducted, and the results show that, compared with the single-Stage Compression heat pump system, the cooling capacity and cooling COP can increase 5%–15% and 10–12%, respectively. Also, the heating capacity with the evaporating temperature ranging from 0.3 to 3 °C is 92–95% of that under the rate condition with the evaporating temperature of 7 °C, and 58% when the evaporation temperature is between −28 °C and −24 °C.
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Experimental study on two-Stage Compression refrigeration/heat pump system with dual-cylinder rolling piston compressor
Applied Thermal Engineering, 2014Co-Authors: Xu Shuxue, Ma GuoyuanAbstract:Abstract A thermodynamically analytical model on the two-Stage Compression refrigeration/heat pump system with vapor injection was derived. The optimal volume ratio of the high-pressure cylinder to the low-pressure one has been discussed under both cooling and heating conditions. Based on the above research, the prototype was developed and its experimental setup established. A comprehensive experiments for the prototype have been conducted, and the results show that, compared with the single-Stage Compression heat pump system, the cooling capacity and cooling COP can increase 5%–15% and 10–12%, respectively. Also, the heating capacity with the evaporating temperature ranging from 0.3 to 3 °C is 92–95% of that under the rate condition with the evaporating temperature of 7 °C, and 58% when the evaporation temperature is between −28 °C and −24 °C.
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exergy analysis for quasi two Stage Compression heat pump system coupled with ejector
Experimental Thermal and Fluid Science, 2011Co-Authors: Xu Shuxue, Ma GuoyuanAbstract:Abstract Ejectors are simple mechanical components, can utilize high pressure energy from liquid in the quasi two-Stage Compression heat pump system coupled with scroll compressor, and the performance of the heat pump system can be further improved. According to thermal analysis model based on the first and second law of thermodynamics, the heat pump prototype has been developed and comprehensively tested, the influence of ejector on the heat pump system was exergetically analyzed using experimental data of the prototype. The results show that, compressor has the greatest exergy loss, amounts to about 77% of the total exergy; ejector can recover the fluid pressure exergy in supplementary circuit compared with the throttling element in the quasi two-Stage Compression heat pump system, decreases the exergy loss of compressor; and the exergetic efficiency can be improved about 3–5%, while the exergy output remains nearly constant.
Hong Li Wang - One of the best experts on this subject based on the ideXlab platform.
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Performance Analysis of Two Stage Compression Cycle with an Internal Heat Exchanger
Applied Mechanics and Materials, 2014Co-Authors: Hong Li Wang, Jing Rui TianAbstract:With increasing of the evaporating temperature, the two Stage Compression cycle with an internal exchanger’s COP has an increasing trend. In addition, R744 achieves the highest COP, and the R12 achieves the minimum level. With increasing of the high pressure and the outlet temperature of the condenser, the two Stage Compression cycle has a down trend. In terms of the increasing intermediate pressure, the two Stage cycle with different refrigerants has different performance: R12’s COP has a downtrend with the pressure changing from 1MPa-3MPa, the rest refrigerants all increased first, and then decreased. Except for R12, they all have optimal intermediate pressure.
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Performance Analysis of Single Stage Compression Cycle with a Throttle Valve
Advanced Materials Research, 2013Co-Authors: Jing Rui Tian, Hong Li WangAbstract:With increasing of high pressure, the performances of all kinds refrigerants except for R744 are all declined and transcritical R744 Compression cycle has an optimum high pressure. With increasing of the evaporating temperature, all cycle COP is an increasing trend, with increasing of outlet temperature of condenser, the performances of all cycles are decreased. Under the same comparison conditions, the performance of R134a refrigerant cycle is superior to the cycles of other refrigerants, and the cycle of R11 refrigerant has the worst performance.
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Performance Analysis of Transcritical CO2 Two Stage Compression Cycle with an Intercooler (TSCC+IC) and the Cycle with an Expander (TSCE+IC)
Advanced Materials Research, 2012Co-Authors: Jing Rui Tian, Hong Li WangAbstract:In range of high pressure, the performance of two Stage Compression cycle with an expander (TSCE+IC) is better than the two Stage cycle with an intercooler (TSCC+IC). In the cycle (TSCE+IC), the optimum discharge temperature is 42°C and the highest COP is 3.3, in the cycle (TSCC+IC), the optimum discharge temperature is 50°C and the highest COP is 3.07. In the cycle (TSCC+IC), the optimum intermediate pressure is 5.8MPa and the highest COP is 3.08, in the cycle (TSCE+IC), the optimum intermediate pressure is 6.2MPa and the highest COP is 3.33. With increasing of evaporating temperature or decreasing outlet temperature of gas cooler, the performance of cycle (TSCE+IC) or cycle (TSCC+IC) is an increasing trend. Under the same conditions, expander cycle performance superior to the throttle valve performance. Some fundamental data were obtained for improving cycle performance and developing the products of CO2 refrigeration air condition and heat pumps.
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theoretical analysis and experimental research on transcritical co2 two Stage Compression cycle with two gas coolers tscc tg and the cycle with intercooler tscc ic
Energy Conversion and Management, 2011Co-Authors: Hong Li Wang, Jing Rui Tian, Minxia LiAbstract:Abstract As one of the natural refrigerants, CO 2 is a potential substitute for synthesized refrigerants with favorable environmental properties. In order to improve the performance of the CO 2 transcritical Compression cycle, the performance of the two Stage Compression cycle with two gas coolers (TSCC + TG) and the two Stage Compression cycle with intercooler (TSCC + IC) were analyzed, respectively. Under the given calculation condition, the optimum intermediate pressure of the cycle TSCC + TG and the TSCC + IC are 7.09 MPa and 5.89 MPa, and the maximal COP are 2.77 and 3.08, respectively. Range of the given evaporating temperature and outlet temperature of gas cooler, the experimental testing shows that the performance of cycle TSCC + IC are 11.88% and 10.87% better than that of the cycle TSCC + TG, respectively. Range of the given inlet temperature and cooling water volume flow of gas cooler, the refrigeration COP (COP c ) and heat COP (COP h ) of the cycle TSCC + IC are average 10.97% and 4.39% higher than that of the cycle TSCC + TG. Range of the given inlet temperature and chilled water volume flow of evaporator, the refrigeration COP (COP c ) and heat COP (COP h ) of the cycle TSCC + IC are average 10.71% and 3.67% higher than that of the cycle TSCC + TG, respectively. The error between theoretical calculation and experimental testing is not exceeds 20%.
Jianlin Yu - One of the best experts on this subject based on the ideXlab platform.
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theoretical analysis on optimal configurations of heat exchanger and compressor in a two Stage Compression air source heat pump system
Applied Thermal Engineering, 2016Co-Authors: Yunxiang Li, Jianlin YuAbstract:Abstract This paper presents an optimum system configuration analysis for a flash tank cycle (FTC) based two-Stage Compression air source heat pump system using a developed theoretical model with lumped parameter method. The analysis is carried out with respect to the thermal conductance allocation of total heat-exchanger inventory (condenser and evaporator) as well as the volume ratio of low-pressure compressor to high-pressure compressor in the system. The analysis results indicate that the heating coefficient of performance (COP) of the heat pump system can be maximized by optimally allocating the thermal conductance inventory of the two heat exchangers. Moreover, there also exists an optimal compressor volumetric displacement ratio, corresponding to the optimum system COP, when the cooling capacity of system is specified. The effects of main operation parameters on the configuration parameters and optimal performances have been discussed. The obtained results may provide some guide for the FTC based air source heat pump system optimization.
Minxia Li - One of the best experts on this subject based on the ideXlab platform.
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theoretical analysis and experimental research on transcritical co2 two Stage Compression cycle with two gas coolers tscc tg and the cycle with intercooler tscc ic
Energy Conversion and Management, 2011Co-Authors: Hong Li Wang, Jing Rui Tian, Minxia LiAbstract:Abstract As one of the natural refrigerants, CO 2 is a potential substitute for synthesized refrigerants with favorable environmental properties. In order to improve the performance of the CO 2 transcritical Compression cycle, the performance of the two Stage Compression cycle with two gas coolers (TSCC + TG) and the two Stage Compression cycle with intercooler (TSCC + IC) were analyzed, respectively. Under the given calculation condition, the optimum intermediate pressure of the cycle TSCC + TG and the TSCC + IC are 7.09 MPa and 5.89 MPa, and the maximal COP are 2.77 and 3.08, respectively. Range of the given evaporating temperature and outlet temperature of gas cooler, the experimental testing shows that the performance of cycle TSCC + IC are 11.88% and 10.87% better than that of the cycle TSCC + TG, respectively. Range of the given inlet temperature and cooling water volume flow of gas cooler, the refrigeration COP (COP c ) and heat COP (COP h ) of the cycle TSCC + IC are average 10.97% and 4.39% higher than that of the cycle TSCC + TG. Range of the given inlet temperature and chilled water volume flow of evaporator, the refrigeration COP (COP c ) and heat COP (COP h ) of the cycle TSCC + IC are average 10.71% and 3.67% higher than that of the cycle TSCC + TG, respectively. The error between theoretical calculation and experimental testing is not exceeds 20%.