Modeling and performance of a two-stage collector/regenerator for solar liquid desiccant air conditioning system
A two-stage collector/regenerator (C/R) for the solar liquid desiccant air conditioning system is presented, which adopts a fin-forming absorber plate and where the liquid desiccant flowing process is divided by an isolation board into two stages: regenerating stage I and regenerating stage II. Then a heat and mass transfer mathematical model is established to predict the performance of the two-stage C/R by using calcium chloride as the desiccant. The main results are as follows: (i) The fin-forming absorber plate can increase heat and mass transfer areas and promote turbulence, so that it significantly enhances heat and mass transfer between solution stream and air stream; (ii) Compared with the traditional C/R, a 10 to 25 percent increase in the water evaporation rate for the two-stage C/R can be achieved under the same operating condition.
Thermodynamic properties of aqueous electrolyte solutions. 1. Vapor pressure of aqueous solutions of lithium chloride, lithium bromide, and lithium iodide
The vapor pressures of aqueous solutions of lithium halides were measured at different concentrations and temperatures from 303.15 to 343.15 K with use of a differential static method. Osmotic and activity coefficients were calculated and compared
Simulation study for an open-cycle absorption solar-cooling system operated in a humid area
A computer simulation study has been made for an open-cycle absorption solar-cooling system operated in a humid area. The system configuration is similar to the one proposed by Wood at Arizona State University. The system with a glazed solar collector/regenerator shows sufficient solar regeneration capacity for operation in Kaohsiung, Taiwan. Many parameters controlling the system performance have been studied, including the amount of solution storage, absorber effectiveness, absorber solution flow rate, and the thermal capacitance of the structure. System simulation, using average local weather data, shows that the solar system can provide 75 to 97% of the cooling load needed for the summer season (from May to October) under various operating conditions.