Abstract
Today, latent heat storage technology has advanced to allow reuse of waste heat in the middle-temperature range. This paper describes an approach to develop a latent heat storage system using middle-temperature waste heat (~100oC - 200oC) from factories. Direct contact melting and solidification behavior between a heat-transfer fluid (oil) and a latent heat storage material mixture were observed. The mixture consisted of mannitol and erythritol (Cm = 70 mass %, Ce = 30 mass %) as a phase-change material (PCM). The weight of the PCM was 3.0 kg and the flow rate of the oil, foil, was 1.0, 1.5, or 2.0 kg/min. To decrease the solidified height of the PCM mixture during the solidification process, a perforated partition plate was installed in the PCM region in the heat storage vessel. PCM coated oil droplets were broken by the perforated partition plate, preventing the solidified height of the PCM from increasing. The solidification and melting processes were repeated using metal fiber. It was found that installing the metal fiber was more effective than installing the perforated partition plate to prevent the flow out problem of the PCM.
Highlights
In recent years, various energy crises have occurred
After oil flowed through the nozzle plate, oil droplets became coated by the solidifying phase-change material (PCM) as a layer around the oil droplet, and they flowed up to the interface between the PCM and oil
The characteristics of heat storage and release of a mannitol and erythritol mixture with various oil flow rates were investigated, and the solidified height was controlled by installing a perforated partition plate in the PCM region in the latent heat storage system
Summary
Various energy crises have occurred. The difference in electric. The improvement in heat storage performance of a direct contact heat exchanger using the phase-change material erythritol and heat transfer oil was described [5]. The direct contact melting and solidification behavior between heat transfer oil and erythritol (PCM) were visualized to investigate the characteristics of heat storage and release at different flow rates of oil (1.0 - 4.0 kg/min) and the effects of a perforated partition plate [9]. We investigated the melting and solidification characteristics of mixtures of mannitol and erythritol (Cm = 70 mass %, Ce = 30 mass %) for latent heat storage at about (100 ̊C - 200 ̊C). The target temperature of heat storage material is 150 ̊C Sugar alcohols such as erythritol and mannitol are both chemically stable in both substances and are extremely harmless to the human body as it is used in sweeteners. We compared the melting and solidification characteristics of the mixture with and without a perforated partition plate, and with aluminum metal fiber
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