Concept Design of a District Cooling System Utilizing Ice/Water Mixture Flow and Development of the Storage Tank

Kawada, Yoshitaka; Yamada, S.; Yoshida, Kaki; Okada, Junichi; Shirakashi, Masataka; Saitoh, Akihiro; Hattori, Masaru

doi:10.5331/seppyo.63.35

Cited by 3 publications

(2 citation statements)

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“…A new cold energy transportation system using ice/water slurry flow is under development for the purpose of raising cold energy density in district cooling systems. Many experimental studies1–4 have been carried out to clarify the flow and heat transfer characteristics of ice/water slurries and to develop devices and instruments to be applied to the system. These studies report that blocking of pipeline elements such as reducers, valves and distribution manifolds is likely to occur due to the formation of compressed ice particle clusters 4–7.…”

Section: Introductionmentioning

confidence: 99%

Ice/Water Slurry Blocking Phenomenon at a Tube Orifice

Hirochi

Yamada

Shintate³

et al. 2002

Annals of the New York Academy of Sciences

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The phenomenon of ice-particle/water mixture blocking flow through a pipeline is a problem that needs to be solved before mixture flow can be applied for practical use in cold energy transportation in a district cooling system. In this work, the blocking mechanism of ice-particle slurry at a tube orifice is investigated and a criterion for blocking is presented. The cohesive nature of ice particles is shown to cause compressed plug type blocking and the compressive yield stress of a particle cluster is presented as a measure for the cohesion strength of ice particles.

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Section: Introductionmentioning

confidence: 99%

Ice/Water Slurry Blocking Phenomenon at a Tube Orifice

Hirochi

Yamada

Shintate³

et al. 2002

Annals of the New York Academy of Sciences

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“…Experimental investigations to understand the characteristics of snow/water slurry flow in pipeline and development of devices, instruments, and control techniques were carried out through subsequent NUT-TDC projects [4][5][6][7][8][9][10]. The understanding on the characteristics of snow/water slurry and techniques for its treatment, obtained through these projects, were transferred to later NUT-TDC projects for the development of district cooling system utilizing ice/water mixture [11]. In this system, it is expected that the diameter of the cold energy delivery pipeline can be reduced to a half of the conventional cold water system by mixing ice with a concentration of up to 20%.…”

Section: Introductionmentioning

confidence: 99%

Blocking of Snow/Water Slurry Flow in Pipeline Caused by Compression-Strengthening of Snow Column

Shirakashi¹,

Yamada

Kawada

et al. 2014

Sustainability

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Abstract:In earlier works by the present authors, two systems for sustainable energy were proposed: (i) a system for urban snow removal in winter and storage for air conditioning in summer, applied to Nagaoka City, which suffers heavy snow fall every winter, and (ii) a district cooling system utilizing latent heat of ice to reduce the size of storage reservoir and transportation pipeline system. In these systems, the hydraulic conveying of snow or ice through pump-and-pipeline is the key technique to be developed, since characteristics of snow (ice)/ water slurry is largely different from those of conventional non-cohesive solid particle slurries. In this study, the blocking of pipeline of snow/water slurry is investigated experimentally. While the blocking of conventional slurry occurs due to deposition of heavy particles at low flow velocity or arching of large rigid particles, that of snow/water slurry is caused by a compressed plug of snow formed due to cohesive nature of snow particles. This is because the strength of snow plug formed at a high resistance piping element, such as an orifice, becomes higher when the compression velocity is lower, resulting in a solid-like plug filling the whole channel upstream the element.

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