Abstract
In this study, the performance of ice slurry production by scraped-surface method was experimentally investigated. Temperature change characteristics, ice packing fraction (IPF) of ice slurry, power consumption of scraping system and coefficient of performance (COP) were measured by varying the concentration of sodium chloride solution, scraping speed, and solution flow rate. The effect of nanosilica on efficiency of ice slurry production was also studied. The results showed that scraping power consumption accounted for only a small proportion (about 5%) of the total power consumption of the system. An increase in the concentration of sodium chloride caused a decrease in the IPF and a decrease in the COP of the system. With the solution flow rate at 1.3 m3/h and scraping speed at 13 rpm, the maximum COP (2.43) was obtained. Furthermore, the addition of nanosilica had a significant effect on improving the system COP.
Highlights
Over the last three decades, interest in using phase-change ice slurry coolants has grown significantly [1,2]
Ice slurry cooling is a promising technology, because of the high energy storage density associated with the latent heat of phase change and the fast cooling rate due to the large surface area available for heat transfer created by its numerous crystals
Various methods have been proposed for ice slurry production, including the scraped-surface method [6,7], supercooling method [8], direct-injection or direct heat exchange method [9,10], fluidized-bed method [11], and vacuum method [12,13]
Summary
Over the last three decades, interest in using phase-change ice slurry coolants has grown significantly [1,2]. Ice slurry cooling is a promising technology, because of the high energy storage density associated with the latent heat of phase change and the fast cooling rate due to the large surface area available for heat transfer created by its numerous crystals. Due to these features, ice slurry can be used in many applications, such as comfort cooling of buildings, mine cooling, food cooling and medical cooling [3,4,5]. The major requirement for the widespread use of ice slurry cooling is a reliable, energy efficient and cost-effective production technology. Various methods have been proposed for ice slurry production, including the scraped-surface method [6,7], supercooling method [8], direct-injection or direct heat exchange method [9,10], fluidized-bed method [11], and vacuum method [12,13]
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