The technical feasibility and economy of solar heat collection-forced evaporation process are the keys to its practicality,especially its application in strong brine treatment.The operation cost of applying solar coll...The technical feasibility and economy of solar heat collection-forced evaporation process are the keys to its practicality,especially its application in strong brine treatment.The operation cost of applying solar collection in salt manufacturing through depth evaporation of brine has been studied.For Na^＋,K^＋,Mg^2＋//Cl^-,SO4^2--H2O salt–water system,most of the Na Cl and all of the Carnallite were separated.The operation cost reached the optimum when the heat collection and evaporation were controlled at 75 and 55℃,respectively.When the solar radiation amount was 19557 kJ·m^-2·d^-1,the solar collector area for producing Carnallite was about 34.27 m^2·（t salt）^-1,and the operation cost was 13 USD·（t salt）^-1.The energy consumption of salt manufacturing is at least 25%higher than that of natural evaporation.Regarding the economy,the solar assisted salt manufacturing process is recommended to be performed at a production scale of more than 20 tons per day.展开更多
The thermodynamic cycle for an adsorption system is presented inp-T diagram. In order to investigate the performance of the adsorption system, a lumped parameter transient model of the chiller is developed, in order t...The thermodynamic cycle for an adsorption system is presented inp-T diagram. In order to investigate the performance of the adsorption system, a lumped parameter transient model of the chiller is developed, in order to predict the behaviors of the adsorption chiller system and find the influence of working conditions on its operation. For the working process of the main components of the system, including adsorber, condenser and evaporator, the coupled unsteady equations were set up for each stage. The model was then solved using stable numerical methods from EES （equation engineering solver）, and the performance of the adsorber and condenser/evaporator of the system was analyzed. The condensation, evaporation and adsorber temperature values as well as the adsorption ratio and desorption ratio were obtained as function of operating time. Also, the coefficient of performance was analyzed in function of the heat source temperature and the cooling source temperature.展开更多
Capillary Pumped Loop (CPL) is a tWo Phase closed system. The tWo main components of CPL, both evaporatorand reservoir are generally believed to play significant roles in its unsteady operation. In thes paper, experim...Capillary Pumped Loop (CPL) is a tWo Phase closed system. The tWo main components of CPL, both evaporatorand reservoir are generally believed to play significant roles in its unsteady operation. In thes paper, experimentaland theoretical investigations are carried out on the influences of unsteady chararterishcs of both of them. Theprevious analyhcal results show that there is a pressure oscillation source in the evaporator and the internaloscillation frequency can be obtained. The reservoir also has an unsteady characterishcs, when the reservoir line hasa smaller damping value, there will be a self-oscillation of Pressure in the reservoir, and its analyhcal frequenciesare normally one or two quantihes bigger than the inherent frequencies of the evaporator. In order to keep CPLoperate steadily, on one hand, the structure of evaporator must be increased to make the conhnuous generated vaporflow out the wick easily, on the other hand, the return liquid ought to be subcooled enough to the reservoirtemperature set value.展开更多
基金Supported by the National Natural Science Foundation of China(51674162)the TriJin Scholars and Natural Science Foundation of Shanxi Province(201601D102058)the Provincial Research Projects(2016JD06,2016-HZ-803)
文摘The technical feasibility and economy of solar heat collection-forced evaporation process are the keys to its practicality,especially its application in strong brine treatment.The operation cost of applying solar collection in salt manufacturing through depth evaporation of brine has been studied.For Na^＋,K^＋,Mg^2＋//Cl^-,SO4^2--H2O salt–water system,most of the Na Cl and all of the Carnallite were separated.The operation cost reached the optimum when the heat collection and evaporation were controlled at 75 and 55℃,respectively.When the solar radiation amount was 19557 kJ·m^-2·d^-1,the solar collector area for producing Carnallite was about 34.27 m^2·（t salt）^-1,and the operation cost was 13 USD·（t salt）^-1.The energy consumption of salt manufacturing is at least 25%higher than that of natural evaporation.Regarding the economy,the solar assisted salt manufacturing process is recommended to be performed at a production scale of more than 20 tons per day.
文摘The thermodynamic cycle for an adsorption system is presented inp-T diagram. In order to investigate the performance of the adsorption system, a lumped parameter transient model of the chiller is developed, in order to predict the behaviors of the adsorption chiller system and find the influence of working conditions on its operation. For the working process of the main components of the system, including adsorber, condenser and evaporator, the coupled unsteady equations were set up for each stage. The model was then solved using stable numerical methods from EES （equation engineering solver）, and the performance of the adsorber and condenser/evaporator of the system was analyzed. The condensation, evaporation and adsorber temperature values as well as the adsorption ratio and desorption ratio were obtained as function of operating time. Also, the coefficient of performance was analyzed in function of the heat source temperature and the cooling source temperature.
文摘Capillary Pumped Loop (CPL) is a tWo Phase closed system. The tWo main components of CPL, both evaporatorand reservoir are generally believed to play significant roles in its unsteady operation. In thes paper, experimentaland theoretical investigations are carried out on the influences of unsteady chararterishcs of both of them. Theprevious analyhcal results show that there is a pressure oscillation source in the evaporator and the internaloscillation frequency can be obtained. The reservoir also has an unsteady characterishcs, when the reservoir line hasa smaller damping value, there will be a self-oscillation of Pressure in the reservoir, and its analyhcal frequenciesare normally one or two quantihes bigger than the inherent frequencies of the evaporator. In order to keep CPLoperate steadily, on one hand, the structure of evaporator must be increased to make the conhnuous generated vaporflow out the wick easily, on the other hand, the return liquid ought to be subcooled enough to the reservoirtemperature set value.
