In this paper, a review on the research progress and applications for heat transfer enhancement of two types of heat exchangers was made, and their heat transfer enhancement methods were compared and analyzed, which could provide a theoretical basis for the structure design and reasonable selection of different heat exchangers, simultaneously the trend of the further research was prospected in order to improve heat transfer effect of heat exchangers.
The accumulation of industrial waste residues is a serious problem with the continuous development of industrial productions during the recent years, how to use reasonably the industrial waste residues has gradually turned into an important research field in the world. Therefore, the research and development of porous ceramics synthesized by the industrial waste residues of fly ash, coal gangue and red mud etc as the raw materials were introduced, the present preparation technique and characteristics of the porous ceramics synthesized by the industrial waste residues were analyzed, and its further investigation was discussed.
Thermal energy storage performance of a new type of PCM heat exchange tube was researched, in which its main body was based on the traditional structure of a double-tube exchanger and was full of PCM (calcium chloride hexahydrate) in the annular area between the inner tube and the outer tube. The hot air at the temperature of 40°C was chosen as a fluid medium, and the temperature measurements of the test points were made at the inlet and the outlet of this new type of PCM heat exchange tube. The experimental results showed that, this new type of PCM heat exchange tube could store thermal energy from the hot air by means of PCM (calcium chloride hexahydrate) in the annular area, whose performance laid good foundations for its engineering applications for recovery and utilizations of greenhouses, air conditioning and industrial afterheat or waste heat etc.
Since energy storage with phase change materials is an effective means of energy saving or conservation in buildings, its investigation and applications have received more and more during the recent years. The research actuality on energy saving of adjustment and control of building indoor temperature was summarized in this paper, and the two types of the major techniques with phase change material applied in adjustment and control of building indoor temperature was reviewed, in which one is the technique combined phase change material with building maintenance structure, the other is the technique to make phase change material applied to heating or air conditioning systems. The future research of phase change energy storage in adjustment and control of building indoor temperature was prospected.
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