Proposal of Solar Heat Conversion System Combined with Adsorption Heat Transformer Cycle and Prediction of Its High-temperature Heat Output

Abstract

In this study, a heat conversion system that supplied heat at temperature between 150 ^oC and 200 ^oC was proposed. By combining a CPC-type solar collector, which is suitable for collecting heat up to approximately 150 ^oC, and an adsorption heat pump with heat transformer cycle, this system can output heat at a higher temperature than the collected heat. In addition, using weather data for one month each in winter and summer, a theoretical prediction of hourly heat output was performed. The superiority of this system was recognized in the case of heat supply in a high temperature range where the amount of heat supplied by the collector alone was small or zero. Calculations showed that this system was suitable for heat supply at temperatures from 160 ^oC in winter and 180 ^oC in summer up to 210 ^oC each. Furthermore, when the output temperature was fixed, the optimum temperature rise range of the adsorption heat transformer cycle, which showed the maximum value of the heat output, could be predicted. Finally, it was found that the heat collected at 150 ^oC could be heated to 275^oC in winter and 225^oC in summer.