Dissertation
Dissertation > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration materials

Characteristics of Salt Solution for Cool Thermal Storage System

Author ZhangXuMing
Tutor HuangLiWei
School Zhejiang University of Technology
Course Environmental Engineering
Keywords Storage Numerical Simulation Nucleation characteristics Nucleating additives Hockey -style
CLC TB64
Type Master's thesis
Year 2007
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The inorganic salt solution is a potential cold accumulating material , but the subcooling and heat transfer problems in the phase change process research much . First storage technology development and research status quo are reviewed on the basis of analysis and research too cold and heat transfer problems in the phase transition of the inorganic salt solution . Experimental Study of a cylindrical container of a nucleating agent and a carrier refrigerant temperature of the salt solution into the nuclear properties . The results show that : -16 ℃ to 100% nucleation KCl eutectic salt solution without addition of nucleating agent , add 0.5% SiO 2 or 1% CuS -13 ℃ to reach 100% into nuclear ; the same uploader refrigerant temperature , low concentrations CuS than the Si0 2 into nuclear properties when added to a certain extent , then the SiO 2 better ; adding 1 % borax 10% NaCl and 12% KCl solution was added 0.02% diatomaceous earth 10 % NH 4 Cl and 10% NaCl solution , add 0.1% CuS 12 % KCl solution can be better suppressed the undercooling ; additives not only can have reduces the degree of subcooling of the solution , but also to shorten the transformation time . Using Fluent software phase transition of KCl eutectic salt Hockey numerical simulation, the temperature distribution and interface mobile law ; relationship between hockey solidification time and the ball diameter and contain refrigerant temperature . Of a hockey cold storage device storage Experimental . The results show that : the amount of latent heat storage section when the regenerator increased more significant thermal regenerator segment is fast , the storage time of about 95 minutes , the total thermal storage rate of about 40% , after every 100 minutes total thermal storage rate increments as follows : 26% , 17 %, 8% , 4%. Total regenerator rate of 90% increased to 95% the time required for about 70 minutes , this is not conducive to energy conservation , not strengthen the hockey , the suspension of thermal storage should not be greater than 90 % .

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