The Experts below are selected from a list of 823098 Experts worldwide ranked by ideXlab platform
Feng Rui Sun - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic modeling and performance analysis of the variable-Temperature Heat reservoir absorption Heat pump cycle
Physica A: Statistical Mechanics and its Applications, 2015Co-Authors: Xiaoyong Qin, Lin Gen Chen, Yanlin Ge, Feng Rui SunAbstract:For practical absorption Heat pump (AHP) plants, not all external Heat reservoir Heat capacities are infinite. External Heat reservoir Heat capacity should be an effect factor in modeling and performance analysis of AHP cycles. A variable-Temperature Heat reservoir AHP cycle is modeled, in which internal working substance is working in four Temperature levels and all irreversibility factors are considered. The irreversibility includes Heat transfer irreversibility, internal dissipation irreversibility and Heat leakage irreversibility. The general equations among coefficient of performance (COP), Heating load and some key characteristic parameters are obtained. The general and optimal characteristics are obtained by using numerical calculations. Besides, the influences of Heat capacities of Heat reservoirs, internal dissipation irreversibility, and Heat leakage irreversibility on cycle performance are analyzed. The conclusions can offer some guidelines for design and operation of AHP plants.
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thermodynamic modelling and performance of variable Temperature Heat reservoir absorption refrigeration cycle
International Journal of Exergy, 2010Co-Authors: Xiaoyong Qin, Lin Gen Chen, Feng Rui SunAbstract:An irreversible variable-Temperature Heat reservoir four-Temperature-level absorption refrigeration cycle model is established in this paper. The considered losses include Heat resistances between Heat reservoirs and working fluid, internal irreversibilities due to internal dissipation of the working fluid, and the Heat leakages between the Heat reservoirs and the surroundings. The general relationships between the cooling load and the COP are derived. Besides, the optimal performance characteristics between the cooling load and the COP are obtained using numerical examples. The effects of Heat resistances, internal irreversibilities, Heat leakages, and the thermal capacitance rates of Heat reservoirs on the cycle performance are analysed.
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power density optimisation of an irreversible variable Temperature Heat reservoir closed intercooled regenerated brayton cycle
International journal of ambient energy, 2009Co-Authors: Lin Gen Chen, Junhua Wang, Feng Rui SunAbstract:SYNOPSIS In this paper, power density, defined as the ratio of power output to maximum specific volume in the cycle, is analysed and optimised for an irreversible closed intercooled regenerated Brayton cycle coupled to variable-Temperature Heat reservoirs, according to the theory of finite-time thermodynamics. The analytical formulae for dimensionless power density and efficiency, as functions of the total pressure ratio, the inter-cooling pressure ratio, the component (i.e. regenerator, intercooler, and hot- and cold-side Heat exchangers) effectivenesses, the compressor and turbine efficiencies, the thermal capacity rates of the working fluid and the Heat reservoirs, the pressure recovery coefficients, the Heat reservoir inlet Temperature ratio, and the inlet Temperature ratio of cooling fluid in the intercooler and the cold-side Heat reservoir, are derived. The optimum dimensionless power density is obtained by optimising the intercooling pressure ratio. The maximum dimensionless power density is obtain...
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power optimization of a regenerated closed variable Temperature Heat reservoir brayton cycle
International Journal of Sustainable Energy, 2007Co-Authors: Lin Gen Chen, Feng Rui SunAbstract:In this paper, the power output of the cycle is taken as an objective for performance analysis and optimization of an irreversible regenerated closed Brayton cycle coupled to variable-Temperature Heat reservoirs in the viewpoint of finite time thermodynamics or entropy generation minimization. The analytical formulae about the relations between power output and pressure ratio are derived with the Heat resistance losses in the hot- and cold-side Heat exchangers and the regenerator, the irreversible compression and expansion losses in the compressor and turbine, the pressure drop losses at the Heater, cooler and regenerator as well as in the piping and the effect of the finite thermal capacity rate of the Heat reservoirs. The maximum power output optimization is performed in two aspects. The first is to search the optimum Heat conductance distribution corresponding to the optimum power output among the hot- and cold-side of the Heat exchangers and the regenerator for a fixed total Heat exchanger inventory. ...
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Power density optimisation of an endoreversible closed variable-Temperature Heat reservoir intercooled regenerated Brayton cycle
International Journal of Ambient Energy, 2006Co-Authors: Junhua Wang, Feng Rui SunAbstract:SYNOPSIS Taking power density, defined as the ratio of power output to the maximum specific volume in the cycle, as the objective function, this paper applies the theory of finite time thermodynamics to find the optimal distribution of Heat conductance of the hot- and cold-side Heat exchangers, the optimal intercooling pressure ratio, the optimal total pressure ratio and the optimal Heat capacity ratio between working fluid and Heat reservoir of an endoreversible closed intercooled regenerated Brayton cycle coupled to variable-Temperature Heat reservoirs with Heat resistance losses in the hot- and cold-side Heat exchangers, the intercooler and the regenerator, by using detailed numerical calculation. The maximum power density, the double-maximum power density and the triple-maximum power density are obtained by optimisation. The effects of some design parameters, including the cycle inlet Heat reservoir Temperature ratio, the inlet Temperature ratio of cooling fluid in the intercooler and the cold-side he...
Hongguang Jin - One of the best experts on this subject based on the ideXlab platform.
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hybrid liquid desiccant air conditioning system combined with marine aerosol removal driven by low Temperature Heat source
Applied Energy, 2020Co-Authors: Yuze Dai, Feng Liu, Jun Sui, Dandan Wang, Wei Han, Hongguang JinAbstract:Abstract The hot and humid air containing marine aerosols on tropical islands or coastal areas always leads to serious equipment corrosion and affects the living comfort of residents. Conventionally, an air-conditioning system can only provide cool dry air, and the marine aerosol removal process consumes expendable materials. To simplify the procedure and reduce the energy consumption, a novel hybrid air-conditioning system combined with marine aerosol removal is proposed in this paper. The novel system achieves multiple functions based on the characteristics of liquid-desiccant dehumidification and phase transitions of the ternary solution system, and it can be driven by a low-Temperature Heat source. Simulation and thermodynamic analysis of the combined system are presented, and the results show that the humidity ratio of the supply air can reach 6.83 g/kg (dry air), with a Temperature of 21.14 °C. Compared with the conventional cooling dehumidification system utilizing vapor compression refrigeration driven by power, the power saving ratio (PSR) and the equivalent power generation efficiency (ηeq) of the proposed system can reach 93.11% and 9.8%, respectively. Further, exergy analyses are carried out, and the results show the air handling process of the novel system has a considerable energy saving potential. Besides, a crystallization experiment is conducted to verify the feasibility of the key NaCl separation process. Finally, economic analyses are carried out, which indicate that the novel system achieves competitive economic performance. This study provides a new hybrid air-conditioning technology for simultaneous cooling, dehumidification and marine aerosol removal by using low-Temperature Heat.
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a two stage liquid desiccant dehumidification system by the cascade utilization of low Temperature Heat for industrial applications
Applied Energy, 2017Co-Authors: Wei Han, Jun Sui, Hongguang JinAbstract:Abstract Cooling dehumidification driven by power is widely used in industrial processes to obtain dry air, but the main drawback is its large power consumption. In these processes, large amounts of low-Temperature waste Heat are released to the environment directly, so there is a great energy-saving potential to recover low-Temperature waste Heat and generate dry air. A new two-stage liquid desiccant dehumidification system with the cascade utilization of low-Temperature Heat is proposed. The waste Heat is used in a cascade manner. The higher-Temperature Heat is used to generate a strong desiccant solution, which will be used in the first-stage dehumidifier. The lower-Temperature Heat is used to drive a single-effect absorption refrigerator and provide cooling energy to the second-stage dehumidifier. Simulation results showed that the proposed system can reduce electricity consumption by 92.29% compared with the conventional cooling dehumidification system driven by power. The ratio of electricity savings to absorbed Heat can reach 7.35%. The advantage of the cascade utilization of the low-Temperature Heat was further illuminated by studying the driving force in the dehumidifiers, and a preliminary economic and environmental analysis was performed. The increased initial investment can be recovered in only 3.39 years. Approximately 11,028 tons of standard coal are saved per year, and a reduction of 27,488 tons CO 2 can also be realized per year. Finally, a parametric sensitivity analysis was conducted to optimize the system performance. This study may provide a new method to perform dehumidification by efficiently using a low-Temperature Heat source.
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a novel liquid desiccant dehumidification system driven by low Temperature Heat for industrial application
Energy Procedia, 2017Co-Authors: Wei Han, Jun Sui, Hongguang JinAbstract:Abstract Cooling dehumidification driven by power is widely used in industrial process to obtain dry air, however, the main drawback is the large power consumption. At the same time, large amount of low-Temperature waste Heat is released to environment directly. There is a great energy saving potential to recover low-Temperature waste Heat and generate dry air. A novel two-stage liquid desiccant dehumidification system with cascade utilization of a low-Temperature Heat is proposed. The waste Heat is used in a cascade way. The higher Temperature Heat is used to generate strong desiccant solution, which will be used in first stage dehumidifier. The lower Temperature Heat is used to drive a single-effect absorption refrigerator and provide cooling energy to the second stage dehumidifier. Simulation results showed that the proposed system can save 96.17% electricity consumption, compared with the conventional cooling dehumidification system driven by power. The ratio of saving electricity and absorbed Heat can reach 6.67%. Furthermore, the advantage of cascade utilizing low-Temperature Heat was elucidated by studying the driven force in the dehumidifiers. This study may provide a new way to perform dehumidification by efficiently using a low-Temperature waste Heat.
Shigeru Koyama - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic assessment of high Temperature Heat pumps using low gwp hfo refrigerants for Heat recovery
International Journal of Refrigeration-revue Internationale Du Froid, 2015Co-Authors: Chieko Kondou, Shigeru KoyamaAbstract:Abstract Reducing energy consumption by utilizing Heat recovery systems has become increasingly important in industry. This paper presents an exploratory assessment of Heat pump type Heat recovery systems using environmentally friendly refrigerants. The coefficient of performance (COP) of 4 cycle configurations used to raise the Temperature of Heat media to 160 °C with a waste Heat at 80 °C is calculated and compared for refrigerants R717, R365mfc, R1234ze(E), and R1234ze(Z). A multiple-stage “extraction” cycle drastically reduces the throttling loss and exergy loss in the condensers, resulting in the highest COP for R1234ze(Z). A cascade cycle using R1234ze(Z) and R365mfc has a relatively high COP and provides practical benefits. Even under adverse conditions, the primary energy efficiency is greater than 1.3 when the transmission end efficiency of the electric power generation is 0.37. The assessment demonstrated that high-Temperature Heat pumps are a promising approach for reducing primary energy consumption for industrial applications.
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low gwp refrigerants r1234ze e and r1234ze z for high Temperature Heat pumps
International Journal of Refrigeration-revue Internationale Du Froid, 2014Co-Authors: Sho Fukuda, Chieko Kondou, Shigeru Koyama, Nobuo TakataAbstract:Abstract Low global warming potential refrigerants R1234ze(E) and R1234ze(Z) are anticipated to be the refrigerants of choice for high-Temperature Heat pump systems in industrial applications. Their thermodynamic attributes are thermodynamically, experimentally, and numerically assessed in this study. The thermodynamic assessment indicates that the theoretical coefficients of performances (COP) are maximized at a condensation Temperature approximately 20 K below the critical Temperatures for each refrigerant. However, when the volumetric capacity is inadequate, the actual COP differs from the theoretical COP because of the large pressure drop. The breakdown of irreversible losses, which are experimentally quantified at a condensation Temperature of 75 °C, results in the largest portion of the total pressure drop. The simulation results obtained at condensation Temperatures of 105 and 125 °C indicate higher COPs than that at 75 °C for R1234ze(Z). The major factor is the reduction in the irreversible loss caused by the pressure drop. The above assessments demonstrate that R1234ze(Z) is suitable for high-Temperature applications rather than in typical air conditioners.
Wei Han - One of the best experts on this subject based on the ideXlab platform.
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hybrid liquid desiccant air conditioning system combined with marine aerosol removal driven by low Temperature Heat source
Applied Energy, 2020Co-Authors: Yuze Dai, Feng Liu, Jun Sui, Dandan Wang, Wei Han, Hongguang JinAbstract:Abstract The hot and humid air containing marine aerosols on tropical islands or coastal areas always leads to serious equipment corrosion and affects the living comfort of residents. Conventionally, an air-conditioning system can only provide cool dry air, and the marine aerosol removal process consumes expendable materials. To simplify the procedure and reduce the energy consumption, a novel hybrid air-conditioning system combined with marine aerosol removal is proposed in this paper. The novel system achieves multiple functions based on the characteristics of liquid-desiccant dehumidification and phase transitions of the ternary solution system, and it can be driven by a low-Temperature Heat source. Simulation and thermodynamic analysis of the combined system are presented, and the results show that the humidity ratio of the supply air can reach 6.83 g/kg (dry air), with a Temperature of 21.14 °C. Compared with the conventional cooling dehumidification system utilizing vapor compression refrigeration driven by power, the power saving ratio (PSR) and the equivalent power generation efficiency (ηeq) of the proposed system can reach 93.11% and 9.8%, respectively. Further, exergy analyses are carried out, and the results show the air handling process of the novel system has a considerable energy saving potential. Besides, a crystallization experiment is conducted to verify the feasibility of the key NaCl separation process. Finally, economic analyses are carried out, which indicate that the novel system achieves competitive economic performance. This study provides a new hybrid air-conditioning technology for simultaneous cooling, dehumidification and marine aerosol removal by using low-Temperature Heat.
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a two stage liquid desiccant dehumidification system by the cascade utilization of low Temperature Heat for industrial applications
Applied Energy, 2017Co-Authors: Wei Han, Jun Sui, Hongguang JinAbstract:Abstract Cooling dehumidification driven by power is widely used in industrial processes to obtain dry air, but the main drawback is its large power consumption. In these processes, large amounts of low-Temperature waste Heat are released to the environment directly, so there is a great energy-saving potential to recover low-Temperature waste Heat and generate dry air. A new two-stage liquid desiccant dehumidification system with the cascade utilization of low-Temperature Heat is proposed. The waste Heat is used in a cascade manner. The higher-Temperature Heat is used to generate a strong desiccant solution, which will be used in the first-stage dehumidifier. The lower-Temperature Heat is used to drive a single-effect absorption refrigerator and provide cooling energy to the second-stage dehumidifier. Simulation results showed that the proposed system can reduce electricity consumption by 92.29% compared with the conventional cooling dehumidification system driven by power. The ratio of electricity savings to absorbed Heat can reach 7.35%. The advantage of the cascade utilization of the low-Temperature Heat was further illuminated by studying the driving force in the dehumidifiers, and a preliminary economic and environmental analysis was performed. The increased initial investment can be recovered in only 3.39 years. Approximately 11,028 tons of standard coal are saved per year, and a reduction of 27,488 tons CO 2 can also be realized per year. Finally, a parametric sensitivity analysis was conducted to optimize the system performance. This study may provide a new method to perform dehumidification by efficiently using a low-Temperature Heat source.
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a novel liquid desiccant dehumidification system driven by low Temperature Heat for industrial application
Energy Procedia, 2017Co-Authors: Wei Han, Jun Sui, Hongguang JinAbstract:Abstract Cooling dehumidification driven by power is widely used in industrial process to obtain dry air, however, the main drawback is the large power consumption. At the same time, large amount of low-Temperature waste Heat is released to environment directly. There is a great energy saving potential to recover low-Temperature waste Heat and generate dry air. A novel two-stage liquid desiccant dehumidification system with cascade utilization of a low-Temperature Heat is proposed. The waste Heat is used in a cascade way. The higher Temperature Heat is used to generate strong desiccant solution, which will be used in first stage dehumidifier. The lower Temperature Heat is used to drive a single-effect absorption refrigerator and provide cooling energy to the second stage dehumidifier. Simulation results showed that the proposed system can save 96.17% electricity consumption, compared with the conventional cooling dehumidification system driven by power. The ratio of saving electricity and absorbed Heat can reach 6.67%. Furthermore, the advantage of cascade utilizing low-Temperature Heat was elucidated by studying the driven force in the dehumidifiers. This study may provide a new way to perform dehumidification by efficiently using a low-Temperature waste Heat.
Jun Sui - One of the best experts on this subject based on the ideXlab platform.
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hybrid liquid desiccant air conditioning system combined with marine aerosol removal driven by low Temperature Heat source
Applied Energy, 2020Co-Authors: Yuze Dai, Feng Liu, Jun Sui, Dandan Wang, Wei Han, Hongguang JinAbstract:Abstract The hot and humid air containing marine aerosols on tropical islands or coastal areas always leads to serious equipment corrosion and affects the living comfort of residents. Conventionally, an air-conditioning system can only provide cool dry air, and the marine aerosol removal process consumes expendable materials. To simplify the procedure and reduce the energy consumption, a novel hybrid air-conditioning system combined with marine aerosol removal is proposed in this paper. The novel system achieves multiple functions based on the characteristics of liquid-desiccant dehumidification and phase transitions of the ternary solution system, and it can be driven by a low-Temperature Heat source. Simulation and thermodynamic analysis of the combined system are presented, and the results show that the humidity ratio of the supply air can reach 6.83 g/kg (dry air), with a Temperature of 21.14 °C. Compared with the conventional cooling dehumidification system utilizing vapor compression refrigeration driven by power, the power saving ratio (PSR) and the equivalent power generation efficiency (ηeq) of the proposed system can reach 93.11% and 9.8%, respectively. Further, exergy analyses are carried out, and the results show the air handling process of the novel system has a considerable energy saving potential. Besides, a crystallization experiment is conducted to verify the feasibility of the key NaCl separation process. Finally, economic analyses are carried out, which indicate that the novel system achieves competitive economic performance. This study provides a new hybrid air-conditioning technology for simultaneous cooling, dehumidification and marine aerosol removal by using low-Temperature Heat.
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a two stage liquid desiccant dehumidification system by the cascade utilization of low Temperature Heat for industrial applications
Applied Energy, 2017Co-Authors: Wei Han, Jun Sui, Hongguang JinAbstract:Abstract Cooling dehumidification driven by power is widely used in industrial processes to obtain dry air, but the main drawback is its large power consumption. In these processes, large amounts of low-Temperature waste Heat are released to the environment directly, so there is a great energy-saving potential to recover low-Temperature waste Heat and generate dry air. A new two-stage liquid desiccant dehumidification system with the cascade utilization of low-Temperature Heat is proposed. The waste Heat is used in a cascade manner. The higher-Temperature Heat is used to generate a strong desiccant solution, which will be used in the first-stage dehumidifier. The lower-Temperature Heat is used to drive a single-effect absorption refrigerator and provide cooling energy to the second-stage dehumidifier. Simulation results showed that the proposed system can reduce electricity consumption by 92.29% compared with the conventional cooling dehumidification system driven by power. The ratio of electricity savings to absorbed Heat can reach 7.35%. The advantage of the cascade utilization of the low-Temperature Heat was further illuminated by studying the driving force in the dehumidifiers, and a preliminary economic and environmental analysis was performed. The increased initial investment can be recovered in only 3.39 years. Approximately 11,028 tons of standard coal are saved per year, and a reduction of 27,488 tons CO 2 can also be realized per year. Finally, a parametric sensitivity analysis was conducted to optimize the system performance. This study may provide a new method to perform dehumidification by efficiently using a low-Temperature Heat source.
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a novel liquid desiccant dehumidification system driven by low Temperature Heat for industrial application
Energy Procedia, 2017Co-Authors: Wei Han, Jun Sui, Hongguang JinAbstract:Abstract Cooling dehumidification driven by power is widely used in industrial process to obtain dry air, however, the main drawback is the large power consumption. At the same time, large amount of low-Temperature waste Heat is released to environment directly. There is a great energy saving potential to recover low-Temperature waste Heat and generate dry air. A novel two-stage liquid desiccant dehumidification system with cascade utilization of a low-Temperature Heat is proposed. The waste Heat is used in a cascade way. The higher Temperature Heat is used to generate strong desiccant solution, which will be used in first stage dehumidifier. The lower Temperature Heat is used to drive a single-effect absorption refrigerator and provide cooling energy to the second stage dehumidifier. Simulation results showed that the proposed system can save 96.17% electricity consumption, compared with the conventional cooling dehumidification system driven by power. The ratio of saving electricity and absorbed Heat can reach 6.67%. Furthermore, the advantage of cascade utilizing low-Temperature Heat was elucidated by studying the driven force in the dehumidifiers. This study may provide a new way to perform dehumidification by efficiently using a low-Temperature waste Heat.
