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R Z Wang - One of the best experts on this subject based on the ideXlab platform.
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development and characterization of mesoporous silicate licl composite Desiccants for solid Desiccant Cooling systems
Industrial & Engineering Chemistry Research, 2015Co-Authors: X Zheng, L M Hu, T.s. Ge, R Z WangAbstract:Solid composite Desiccants are fabricated by impregnating LiCl into pores of SBA-15 and MCM-41 mesoporous silicates. In the study, characteristics including textural properties and equilibrium and dynamic water sorption were tested and analyzed. Research on nitrogen adsorption suggested that because of the impregnated salt, composite Desiccants were different from pure silicates. Sorption isotherms were measured and simulated based on Polanyi potential theory. Composite samples had water uptake much higher than that of pure hosts under low and middle relative pressure owing to mutual contribution of both physical and chemical sorption. Sorption kinetics were also tested and fitted with a linear driving force model. The composite Desiccant prepared from SBA-15 exhibited higher dynamic sorption quantity and a reasonable diffusion rate constant. Finally, dehumidification performance of the composite Desiccant in a novel solid Desiccant Cooling component was evaluated with a mathematical model. Simulation res...
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novel self cooled solid Desiccant Cooling system with integrated Desiccant coated heat exchanger and regenerative evaporative cooler
International sorption heat pump conference (ISHPC2014) College Park United States March 31-April 2 2014., 2014Co-Authors: R Z Wang, Y J DaiAbstract:Solid Desiccant Cooling technology has become a research focus for its features of energy-saving and eco-friendly. However, widely adopted rotary Desiccant wheel Cooling system can’t realize inner-Cooling dehumidification process. In this paper, a novel self-cooled solid Desiccant Cooling system (SCDHE) is developed by integrating Desiccant coated heat exchanger and regenerative evaporative cooler. In the system, regenerative evaporative cooler is adopted to produce chilled water, which is again pumped into Desiccant coated heat exchanger in dehumidification process to realize self-cooled dehumidification process. Similarly, in regeneration process, hot water heated by low grade thermal energy is adopted to regenerate the coated Desiccant material. A mathematical model is established to validate the feasibility and to analyze performance of this novel system. Also, effects of ambient air condition are predicted. It is found that SCDHE system is feasible, it can provide satisfied supply air to conditioned room under simulated ARI summer condition, and the required regeneration temperature is from 50-80oC which is lower than rotary wheel Desiccant Cooling system. Also, there exists an optimal switch time and suitable control mode for system to obtain enhanced performance in terms of Cooling power. Compared with conventional DCHE Cooling system without regenerative evaporative Cooling, SCDHE system can provide satisfied supply air while conventional system cannot, also it can obtained increased Cooling power. Under simulation condition, Cooling power of SCDHE system increases by about 30% compared with conventional DCHE Cooling system.
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Recent progress on Desiccant materials for solid Desiccant Cooling systems
Energy, 2014Co-Authors: T.s. Ge, R Z WangAbstract:SDC (Solid Desiccant Cooling) systems have gained increasing interest as an alternative air conditioning technology. Performance of Desiccant plays a crucial role in overall performance of the whole system, especially in terms of dehumidification and regeneration capacity. It is desirable to explore Desiccant possessing high adsorption capacity and good regeneration ability. Thus, this review summarizes recent researches and developments on novel solid Desiccant materials that can be adopted in SDC systems. The materials include composite Desiccants, nanoporous inorganic materials and polymeric Desiccants. Adsorption isotherms are concluded and compared. Regeneration ability is also considered for full use of low grade thermal energy. Results show that by proper selection of host matrix and immersed salts, composite Desiccants have improved capacity of dehumidification and regeneration. Besides, a good balance can be reached between regeneration and adsorption capacity by tailoring textural properties of nanoporous inorganic materials. For polymeric Desiccants, especially MIL type (materials of Institute Lavoisier Frameworks), further progress in adsorptive dehumidification will be anticipated. Though some novel materials approach requirements for SDC systems, no material currently available can perfectly satisfy all the required demands. In this case, more intensive researches in the field of development and evaluation of advanced materials are still required.
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effect of irreversible processes on the thermodynamic performance of open cycle Desiccant Cooling cycles
Energy Conversion and Management, 2013Co-Authors: Dong La, T.s. Ge, Yong Li, R Z WangAbstract:Abstract Thermodynamic analyses of Desiccant Cooling cycle usually focus on the overall cycle performance in previous study. In this paper, the effects of the individual irreversible processes in each component on thermodynamic performance are analyzed in detail. The objective of this paper is to reveal the elemental features of the individual components, and to show their effects on the thermodynamic performance of the whole cycle in a fundamental way. Appropriate indexes for thermodynamic evaluation are derived based on the first and second law analyses. A generalized model independent of the connection of components is developed. The results indicate that as the effectiveness of the Desiccant wheel increases, the cycle performance is increased principally due to the significant reduction in exergy carried out by exhaust air. The corresponding exergy destruction coefficient of the cycle with moderate performance Desiccant wheel is decreased greatly to 3.9%, which is more than 50% lower than that of the cycle with low performance Desiccant wheel. The effect of the heat source is similar. As the temperature of the heat source increases from 60 °C to 90 °C, the percentage of exergy destruction raised by exhaust air increases sharply from 5.3% to 21.8%. High heat exchanger effectiveness improves the cycle performance mainly by lowering the irreversibility of the heat exchanger, using less regeneration heat and pre-Cooling the process air effectively.
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development of a novel rotary Desiccant Cooling cycle with isothermal dehumidification and regenerative evaporative Cooling using thermodynamic analysis method
Energy, 2012Co-Authors: Dong La, T.s. Ge, Y Li, R Z WangAbstract:A novel rotary Desiccant Cooling cycle is proposed and studied using thermodynamic analysis method. The proposed cycle integrates the technologies of isothermal dehumidification and regenerative evaporative Cooling, which are beneficial for irreversibility reduction. Thermodynamic investigation on the basic rotary Desiccant Cooling cycle shows that the exergy efficiency of the basic cycle is only 8.6%. The processes of Desiccant dehumidification and evaporative Cooling, which are essentially the basis for rotary Desiccant Cooling, affect the exergy performance of the cycle greatly and account for about one third of the total exergy destruction. The proposed cycle has potential to improve rotary Desiccant Cooling technology. It is advantageous in terms of both heat source utilization rate and space Cooling capacity. The exergy efficiency of the new cycle is enhanced significantly to 29.1%, which is about three times that of the ventilation cycle, and 60% higher than that of the two-stage rotary Desiccant Cooling cycle. Furthermore, the regeneration temperature is reduced from 80 °C to about 60 °C. The corresponding specific exergy of the supply air is increased by nearly 30% when compared with the conventional cycles.
T.s. Ge - One of the best experts on this subject based on the ideXlab platform.
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development and characterization of mesoporous silicate licl composite Desiccants for solid Desiccant Cooling systems
Industrial & Engineering Chemistry Research, 2015Co-Authors: X Zheng, L M Hu, T.s. Ge, R Z WangAbstract:Solid composite Desiccants are fabricated by impregnating LiCl into pores of SBA-15 and MCM-41 mesoporous silicates. In the study, characteristics including textural properties and equilibrium and dynamic water sorption were tested and analyzed. Research on nitrogen adsorption suggested that because of the impregnated salt, composite Desiccants were different from pure silicates. Sorption isotherms were measured and simulated based on Polanyi potential theory. Composite samples had water uptake much higher than that of pure hosts under low and middle relative pressure owing to mutual contribution of both physical and chemical sorption. Sorption kinetics were also tested and fitted with a linear driving force model. The composite Desiccant prepared from SBA-15 exhibited higher dynamic sorption quantity and a reasonable diffusion rate constant. Finally, dehumidification performance of the composite Desiccant in a novel solid Desiccant Cooling component was evaluated with a mathematical model. Simulation res...
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Recent progress on Desiccant materials for solid Desiccant Cooling systems
Energy, 2014Co-Authors: T.s. Ge, R Z WangAbstract:SDC (Solid Desiccant Cooling) systems have gained increasing interest as an alternative air conditioning technology. Performance of Desiccant plays a crucial role in overall performance of the whole system, especially in terms of dehumidification and regeneration capacity. It is desirable to explore Desiccant possessing high adsorption capacity and good regeneration ability. Thus, this review summarizes recent researches and developments on novel solid Desiccant materials that can be adopted in SDC systems. The materials include composite Desiccants, nanoporous inorganic materials and polymeric Desiccants. Adsorption isotherms are concluded and compared. Regeneration ability is also considered for full use of low grade thermal energy. Results show that by proper selection of host matrix and immersed salts, composite Desiccants have improved capacity of dehumidification and regeneration. Besides, a good balance can be reached between regeneration and adsorption capacity by tailoring textural properties of nanoporous inorganic materials. For polymeric Desiccants, especially MIL type (materials of Institute Lavoisier Frameworks), further progress in adsorptive dehumidification will be anticipated. Though some novel materials approach requirements for SDC systems, no material currently available can perfectly satisfy all the required demands. In this case, more intensive researches in the field of development and evaluation of advanced materials are still required.
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effect of irreversible processes on the thermodynamic performance of open cycle Desiccant Cooling cycles
Energy Conversion and Management, 2013Co-Authors: Dong La, T.s. Ge, Yong Li, R Z WangAbstract:Abstract Thermodynamic analyses of Desiccant Cooling cycle usually focus on the overall cycle performance in previous study. In this paper, the effects of the individual irreversible processes in each component on thermodynamic performance are analyzed in detail. The objective of this paper is to reveal the elemental features of the individual components, and to show their effects on the thermodynamic performance of the whole cycle in a fundamental way. Appropriate indexes for thermodynamic evaluation are derived based on the first and second law analyses. A generalized model independent of the connection of components is developed. The results indicate that as the effectiveness of the Desiccant wheel increases, the cycle performance is increased principally due to the significant reduction in exergy carried out by exhaust air. The corresponding exergy destruction coefficient of the cycle with moderate performance Desiccant wheel is decreased greatly to 3.9%, which is more than 50% lower than that of the cycle with low performance Desiccant wheel. The effect of the heat source is similar. As the temperature of the heat source increases from 60 °C to 90 °C, the percentage of exergy destruction raised by exhaust air increases sharply from 5.3% to 21.8%. High heat exchanger effectiveness improves the cycle performance mainly by lowering the irreversibility of the heat exchanger, using less regeneration heat and pre-Cooling the process air effectively.
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development of a novel rotary Desiccant Cooling cycle with isothermal dehumidification and regenerative evaporative Cooling using thermodynamic analysis method
Energy, 2012Co-Authors: Dong La, T.s. Ge, Y Li, R Z WangAbstract:A novel rotary Desiccant Cooling cycle is proposed and studied using thermodynamic analysis method. The proposed cycle integrates the technologies of isothermal dehumidification and regenerative evaporative Cooling, which are beneficial for irreversibility reduction. Thermodynamic investigation on the basic rotary Desiccant Cooling cycle shows that the exergy efficiency of the basic cycle is only 8.6%. The processes of Desiccant dehumidification and evaporative Cooling, which are essentially the basis for rotary Desiccant Cooling, affect the exergy performance of the cycle greatly and account for about one third of the total exergy destruction. The proposed cycle has potential to improve rotary Desiccant Cooling technology. It is advantageous in terms of both heat source utilization rate and space Cooling capacity. The exergy efficiency of the new cycle is enhanced significantly to 29.1%, which is about three times that of the ventilation cycle, and 60% higher than that of the two-stage rotary Desiccant Cooling cycle. Furthermore, the regeneration temperature is reduced from 80 °C to about 60 °C. The corresponding specific exergy of the supply air is increased by nearly 30% when compared with the conventional cycles.
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case study and theoretical analysis of a solar driven two stage rotary Desiccant Cooling system assisted by vapor compression air conditioning
Solar Energy, 2011Co-Authors: Dong La, T.s. Ge, Yong Li, R Z WangAbstract:Abstract In this paper, a solar hybrid Desiccant air conditioning system, which combines the technologies of two-stage Desiccant Cooling (TSDC) and air-source vapor compression air-conditioning (VAC) together, has been configured, experimentally investigated and theoretically analyzed. The system mainly includes a TSDC unit with design Cooling capacity for 10 kW, an air-source VAC unit with 20 kW in nominal Cooling capacity, a flat plate solar collector array for 90 m2, a hot water storage tank and a Cooling tower. Performance model of the system has been created in TRNSYS simulation studio. The objective of this paper is to report the test result of the solar hybrid air conditioning system and evaluate the energy saving potential, thereby providing useful data for practical application. Experimental results show that, under typical weather condition, the solar driven Desiccant Cooling unit can achieve an average Cooling capacity of 10.9 kW, which contributes 35.7% of the Cooling capacity provided by the hybrid system. Corresponding average thermal COP is over 1.0, electric COP is up to 11.48. Under Beijing (temperate), Shanghai (humid) and Hong Kong (extreme humid) weather conditions, the solar TSDC unit can remove about 57%, 69% and 55% of the seasonal moisture load, thereby reducing electric power consumption by about 31%, 34% and 22%, respectively. These suggest that the solar hybrid system is feasible for a wide range of operating conditions.
K.f. Fong - One of the best experts on this subject based on the ideXlab platform.
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solar Desiccant Cooling system for hot and humid region a new perspective and investigation
Solar Energy, 2020Co-Authors: K.f. Fong, C K LeeAbstract:Abstract With the urge for zero energy buildings, the increasing use of renewable energy sources like solar power is indispensable. Besides, the better utilization of renewable energy sources is also critical. Solar Cooling has been a hot topic, in particular the solar Desiccant Cooling system for use in hot and humid regions. In response to a recent study, the role of the Desiccant wheel in a solar Cooling system under such climatic conditions was reviewed through year-round dynamic system simulation using TRNSYS. It was found that the use of thermally-driven Desiccant Cooling cycle in combination with absorption Cooling was not a good choice for general application when zone humidity control was not mandatory. Rather, the proposed operation of the Desiccant wheel at a higher speed for energy recovery only without heat regeneration offered 9.5% improvement in the solar fraction and 11.5% reduction in the total primary energy consumption, as compared to the former one when the seasonal effect was also taken into account. The merit of the proposed solar Cooling system with energy recovery increased with the expected improvement in the grid thermal efficiency in long term, which further confirmed the appropriateness of the recommended design strategy.
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new perspectives in solid Desiccant Cooling for hot and humid regions
Energy and Buildings, 2018Co-Authors: K.f. Fong, C K LeeAbstract:Abstract In this study, new perspectives in the Desiccant Cooling system (DCS) have been derived, which are helpful to achieve an energy-efficient design through the heat-driven Cooling equipment. Under the circumstances of handling the ventilation load in the hot and humid regions, it was found that the DCS could provide tangible Cooling capacity both with and without the regeneration heat. In the absence of regeneration heat, the DCS was preferable to have solid Desiccant wheel operated at a high rotational speed together with a sensible heat exchanger. In the presence of regeneration heat, the DCS should operate the Desiccant wheel at a low speed, with a sensible heat exchanger and a regenerative air evaporative cooler. The coefficient of performance was found decreased with the regeneration temperature in such scenario. It was also identified that the regeneration temperature should be higher than 60 °C, otherwise the DCS would function even worse than that without regeneration heat. This imposed a limitation of low-grade renewable or waste heat sources for DCS application. In fact, it would be more energy-efficient if the low-grade regeneration heat was used to drive an adsorption chiller while the DCS was simply employed as an energy recovery unit.
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investigation on solar hybrid Desiccant Cooling system for commercial premises with high latent Cooling load in subtropical hong kong
Applied Thermal Engineering, 2011Co-Authors: K.f. Fong, T T Chow, A M L FongAbstract:This study found that the solar hybrid Desiccant Cooling system (SHDCS) was more effective to handle the premises with high latent Cooling load in the hot and humid climate compared to the conventional airconditioning system. The SHDCS was designed to use the solar-thermal Desiccant Cooling to tackle the latent load; and the electrical vapour compression refrigeration to cater the sensible load. In this study, the typical commercial premises with high latent load were the Chinese restaurant and the wet market. The effectiveness of SHDCS included both better indoor Cooling performance and higher year-round energy-saving potential. The annual primary energy consumption of SHDCS could be lower than that of the conventional system by 49.5% in the Chinese restaurant and 13.3% in the wet market. For the premises with more stringent temperature and humidity requirements, like the Chinese restaurant, the contribution of SHDCS in energy saving would be significant. Utilization of solar energy could ensure the energy-saving potential of SHDCS for the premises with high latent load. As a whole, the study assures the wider application of solar air-conditioning in the subtropical Hong Kong.
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advancement of solar Desiccant Cooling system for building use in subtropical hong kong
Energy and Buildings, 2010Co-Authors: K.f. Fong, T T Chow, L S ChanAbstract:Abstract The solar Desiccant Cooling system (SDCS) had a saving potential of the year-round primary energy consumption as compared to the conventional air-conditioning system for full fresh air application in the subtropical Hong Kong. In order to further enhance its energy efficiency, advancement of the basic SDCS was carried out through a strategy of hybrid design. Six hybrid system alternatives of SDCS were therefore proposed, three for full fresh air design while another three for return air design for the building zone. Year-round performance evaluation of each solar hybrid Desiccant Cooling system was conducted for typical office application under different climatic and loading conditions. All the six hybrid system alternatives were found technically feasible, with up to 35.2% saving of year-round primary energy consumption against the conventional air-conditioning systems. Among the hybrid alternatives, recommendations were made on the SDCS hybridized with vapour compression refrigeration for full fresh air design; and the SDCS hybridized with vapour absorption refrigeration for return air design, since they had the saving potentials of both primary energy and initial cost. These two hybrid system alternatives used evacuated tubes, a more economical type of solar collectors compared to the PV or PVT panels.
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simulation optimization of solar assisted Desiccant Cooling system for subtropical hong kong
Applied Thermal Engineering, 2010Co-Authors: K.f. Fong, T T Chow, L S ChanAbstract:Abstract Solar Cooling is a novel approach, which primarily makes use of solar energy, instead of electricity, to drive the air-conditioning systems. In this study, solar-assisted Desiccant Cooling system (SADCS) was designed to handle the Cooling load of typical office in the subtropical Hong Kong, in which half of the building energy is consumed by the air-conditioning systems. The SADCS mainly consisted of Desiccant wheel, thermal wheel, evaporative coolers, solar air collectors and gas-fired auxiliary heater, it could directly tackle both the space load and ventilation load. Since the supply air flow is same as the outdoor air flow, the SADCS has a feature of sufficient ventilation that enhances the indoor air quality. Although it is inevitable to involve the auxiliary heater for regeneration of Desiccant wheel, it is possible to minimize its usage by the optimal design and control scheme of the SADCS. Through simulation–optimization approach, the SADCS can provide a satisfactory performance in the subtropical Hong Kong.
Ruzhu Wang - One of the best experts on this subject based on the ideXlab platform.
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Theoretical analysis and case study on solar driven two-stage rotary Desiccant Cooling system combined with geothermal heat pump
Energy Procedia, 2015Co-Authors: Xian Li, Ruzhu WangAbstract:Abstract In this paper, a solar hybrid Desiccant air conditioning system, which combines the technologies of two-stage Desiccant Cooling system and geothermal heat pump together, has been configured and theoretically analyzed. The hybrid system mainly includes a two-stage Desiccant Cooling system with design Cooling capacity of 80 kW, a geothermal heat pump for fresh air handling with 75 kW in nominal Cooling capacity, a geothermal heat pump for capillary radiation terminal with Cooling capacity of 244 kW, an evacuated tubular solar collector array of 530 m 2 , a hot water storage tank and a Cooling tower. Performance model of the system has been created in TRNSYS simulation studio. The aim of this paper is to evaluate the performance of the solar hybrid air conditioning system, thereby providing useful data for practical application in the demonstration project. Simulation results show that, under typical weather condition, the solar driven Desiccant Cooling unit can achieve an average Cooling capacity of 70 kW, which contributes 31.4% of the Cooling capacity provided by the hybrid system. Corresponding average thermal COP is about0.83 under Shanghai weather conditions.
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Performance of two-stage rotary Desiccant Cooling system with different regeneration temperatures
Energy, 2015Co-Authors: Y J Dai, Ruzhu WangAbstract:Abstract Increasing attention is being given to energy-saving air conditioning technology in recent years. Using natural refrigerant and driven by low grade thermal energy, rotary Desiccant Cooling system has become a sound alternative solution to conventional vapor compression system. Although one-stage ventilation rotary Desiccant Cooling system is still the main stream, TSDC (two-stage rotary Desiccant Cooling) system recently emerges as the latest development, which can be driven by lower regeneration temperature (50–90 °C) compared with one-stage system. In this paper, performance of TSDC with different regeneration temperatures in two stages is analyzed. First integrated mathematical model of TSDC system is established by combing models of different components. Cooling power and COPth (thermal coefficient of performance) are utilized as performance indicators. Then system performance with respect to different combinations of two regeneration temperatures are simulated and discussed, while optimization investigation is also conducted to obtain maximum COPth with same Cooling power. Under the simulation condition, results show that Cooling power of the system increases with the increase of regeneration temperatures, however, COPth decreases. Also, when the first stage operates in higher regeneration temperature, TSDC system can obtain better performance reflecting in both Cooling power and in COPth. Moreover, with the same Cooling power provided, COPth of TSDC system obtains a minimum value when temperatures of the two stages approach.
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Feasible study of a self-cooled solid Desiccant Cooling system based on Desiccant coated heat exchanger
Applied Thermal Engineering, 2013Co-Authors: Tianshu Ge, Ruzhu Wang, Y LiAbstract:Abstract Solid Desiccant Cooling technology has become a research focus for its features of energy-saving and eco-friendly. However, widely adopted rotary Desiccant wheel Cooling system can't realize inner-Cooling dehumidification process. In this paper, a novel self-cooled solid Desiccant Cooling system (SCDHE) is developed by integrating Desiccant coated heat exchanger and regenerative evaporative cooler. In the system, regenerative evaporative cooler is adopted to produce chilled water, which is again pumped into Desiccant coated heat exchanger in dehumidification process to realize self-cooled dehumidification process. Similarly, in regeneration process, hot water heated by low grade thermal energy is adopted to regenerate the coated Desiccant material. A mathematical model is established to validate the feasibility and to analyze performance of this novel system. Also, effects of ambient air condition are predicted. It is found that SCDHE system is feasible, it can provide satisfied supply air to conditioned room under simulated ARI summer condition, and the required regeneration temperature is from 50 to 80 °C which is lower than rotary wheel Desiccant Cooling system. Also, there exists an optimal switch time and suitable control mode for system to obtain enhanced performance in terms of Cooling power. Compared with conventional DCHE Cooling system without regenerative evaporative Cooling, SCDHE system can provide satisfied supply air while conventional system cannot, also it can obtain increased Cooling power. Under simulation condition, Cooling power of SCDHE system increases by about 30% compared with conventional DCHE Cooling system.
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Use of compound Desiccant to develop high performance Desiccant Cooling system
International Journal of Refrigeration-revue Internationale Du Froid, 2007Co-Authors: Ji-tao Wu, Ruzhu WangAbstract:Abstract The paper is aimed to develop a high performance rotary solid Desiccant Cooling system using a novel compound Desiccant wheel (DW). The unique feature of the Desiccant wheel is that it can work well under a lower regeneration temperature and have a higher dehumidification capacity due to the contribution of the new compound Desiccant materials. Experimental results indicate that the novel Desiccant wheel under practical operation can remove more moisture from the process air by about 20–40% over the Desiccant wheel employing regular silica gel. A mathematical model that is used to predict the system performance has been validated with the test results. By integrating the Desiccant wheel with evaporative Cooling, heat recovery and heating for regeneration sections, a solid Desiccant Cooling system can be formed. Simulation results show that because of the use of the new compound Desiccant, the Desiccant Cooling system can work under much lower regeneration temperature and have a relative high COP, thus low grade thermal energy resources, such as solar energy, waste heat, etc., can be efficiently utilized to drive such a Cooling cycle.
Lei Fang - One of the best experts on this subject based on the ideXlab platform.
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theoretical modelling and experimental study of air thermal conditioning process of a heat pump assisted solid Desiccant Cooling system
Energy and Buildings, 2017Co-Authors: Jinzhe Nie, Lei Fang, Qunli ZhangAbstract:Abstract Taking the integrated gaseous contaminants and moisture adsorption potential of Desiccant material, a new heat pump assisted solid Desiccant Cooling system (HP-SDC) was proposed based on the combination of Desiccant rotor with heat pump. The HP-SDC was designed for dehumidification, Cooling and air purification aimed at improving indoor air quality and reducing building energy consumption. The heat and moisture transfer in adsorption Desiccant rotor was theoretical modelled with one-dimensional partial differential equations. The theoretical model was validated with experimental measurements, and the results showed the model could be used to predict the heat and moisture transfer in Desiccant rotor. The air thermal conditioning process and energy consumption of HP-SDC was then experimental measured under varied outdoor thermal environments. Results showed that compared to conventional ventilation system, the energy performance of HP-SDC was more efficient mainly due to high efficient air purification capacity, reduction of Cooling load and raised evaporation temperature. The energy performance of HP-SDC was sensitive to outdoor humidity ratio. Further improvements of HP-SDC energy efficiency are suggested to be focused on low regeneration temperature Desiccant rotor and more efficient high temperature refrigerant.
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theoretical study on volatile organic compound removal and energy performance of a novel heat pump assisted solid Desiccant Cooling system
Building and Environment, 2015Co-Authors: Jinzhe Nie, Lei Fang, Ge Zhang, Ying Sheng, Xiangrui Kong, Yufeng Zhang, Bjarne W OlesenAbstract:Abstract A theoretical model was established for predicting the volatile organic compound (VOC) removal and energy performance of a novel heat pump assisted solid Desiccant Cooling system (HP-SDC). The HP-SDC was proposed based on the combination of Desiccant rotor with heat pump, and was designed for Cooling, dehumidification and indoor air cleaning in normal office, commercial or residential buildings. The Desiccant rotor was used for dehumidification and indoor air cleaning; the heat pump provided sensible Cooling and regeneration heat for the Desiccant rotor. The theoretical model consisted of two sub-models. One sub-model was used to simulate the heat, moisture and VOC transfer in the Desiccant rotor; the other sub-model was used to predict the energy performance of the heat pump. Combining the two sub-models, the energy performance and VOC removal effect of the HP-SDC could be simulated and predicted. The theoretical model was validated by experimental data. Validating results showed that the model could be used to predict the performance of HP-SDC. The results also showed that the HP-SDC could clean air borne contaminants effectively and could provide an energy efficient choice for ventilation.