The high temperature operation of Evacuated Tube Collectors (ETC) and their very low radiant heat losses make them ideal for solar water heating, solar space heating, desiccant air conditioning, thermal driven cooling and industrial process heating applications. The work temperature of common ETC can reach 100~ 250°C. The vacuum tube envelope minimizes heat loss and ensures high collector durability and steady performance. This paper investigates different types of solar thermal collectors and compared them so that the result which the heat loss of ETC is least is obtained. The thermal analysis and performance of ETC are investigated as well.

This paper investigates heat transfer enhancement of the microencapsulated phase change material (MPCM) suspension. The specific heat of tested sample is measured by A Differential Scan Calorimeter (DSC) analysis. The corrected factor of sample is obtained by theoretical analysis and DSC measurement. The thermal conductivity is obtained by theoretical analysis and verified by previous works.

Microencapsulated phase change material (MPCM) suspension is a novel material which has functions as thermal energy storage medium and heat transfer fluid. Its physical characteristic is complicated so that little work been done on the characteristics of MPCM suspension has been published. So it is helpful for selection of new heat transfer form to analyze the characteristics of MPCM suspension. This paper investigates thermal physical characteristics of the MPCM suspension which comprise thermal properties DSC analysis, viscosity analysis and the suspension property analysis. The viscosity measurement and test analysis of MPCM suspension were also carried out to verify the theoretical analyses.

The transport properties of microencapsulated phase change material (MPCM) suspension are helpful for selection of components in the MPCM suspension transport system. The properties of MPCM sample are investigated theoretically. Transport property of MPCM suspension, especially pressure drop in pipe system, has been identified by theoretical analysis. The experimental researches in transport capability and power consumption of MPCM suspension are investigated as well.