The Wireless Monitoring System of Solar Receiver
In solar thermal utilization technology, one needs to calculate the conversion efficiency and verify whether safety and durability meet the design requirements by monitoring solar receiving system, and improve the solar receiving system according to the experimental data. This paper introduces a system designed for performance detecting of non vacuum solar thermal receiving pipe and its high efficiency selective coating. The system mainly has three functions: 1. Monitor the selective absorbing of heat-receiving pipe, and evaluate the attenuation of coating structure properties, 2. To calculate the thermal power, and analyze receiver's thermal conversion efficiency, the medium's temperature in the exit of receiver should be monitored, 3. When the system is operating, monitor the temperature, pressure, medium's flow in the pipes and the liquid level in the tank. Estimate safety and durability of system.
Solar Thermal Power Generation Technology
Describes the classification of solar thermal power generation technology and its application prospect in our country.
Experimental Study for a Double-Glazed Forced-Flow Solar Collector/Regenerator
Experimental study of a double-glazed forced-convection solar collector/regenerator for absorption solar cooling is presented. The south facing experimental solar collector/regenerator with 10 deg slope is located at Kaohsiung, Taiwan at 120{degree}19minutesE longitude and 22{degree}34minutesN latitude. The size of the collector is 1 m wide and 7 m long with an effective regeneration area of 0.9 m by 6 m. Previous study for single-glazed forced-convection solar collector/regenerator operated at the same location has shown to have a best day-average efficiency of 17%. In order to raise the system performance, a double-glazed collector/regenerator is constructed such that air can be preheated in the upper channel flow. The preheated air is then conducted into the lower channel where it contacts with the film flow of solar heated lithium-chloride solution and regenerates the solution by carrying out the evaporated water vapor. The preheated air has lower relative humidity but the same humidity ratio since it is sensibly heated. Therefore, the regeneration driving potential is increased. The present study shows that the best day-average efficiency can reach 20% which increases the feasibility of the open-cycle absorption solar cooling system. Effects of controlling parameters on the collector/regenerator performance are studied, and heat and mass transfer correlationsmore » are also presented for design purposes.« less