Compositions – Frost-preventing – ice-thawing – thermostatic – thermophoric,...
Patent
1997-11-18
2000-07-04
Green, Anthony
Compositions
Frost-preventing, ice-thawing, thermostatic, thermophoric,...
165 10, C09K 500, C09K 506
Patent
active
06083417&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a thermal storage (accumulating) agent used for heat and cold storage, especially suitably used for heating and cooling air-conditioning systems of buildings, by the exploitation of latent heat generated by a transformation of phase, and further relates to a manufacturing method of such a thermal storage agent, a thermal storage material and device having the thermal storage agent, and a manufacturing method of the thermal storage material.
BACKGROUND OF THE INVENTION
Conventionally, in a case where heat is used as energy for domestic and industrial uses, the use of a thermal storage body, i.e., a medium for thermal transportation and temporary storage, has been proposed when the heat is generated and consumed at different places, and when there is a time lag between the generation of heat and the consumption thereof.
Thermal storage bodies typically exploit either sensible heat taking advantage of the thermal capacity thereof or latent heat produced by a transformation of phase thereof. Latent heat is a phenomenon of heat absorption upon the transformation from solid phase to liquid phase and heat release upon the transformation from liquid phase to solid phase.
Examples of such thermal storage bodies taking advantage of sensible heat include water, stone, and various kinds of metals. However, those taking advantage of sensible heat have drawbacks: a larger thermal storage tank is required to compensate for the low thermal capacity thereof and the low specific latent heat thereof, and the temperatures at the heat source and at the heat consumption are restricted because of a possible wide temperature range upon the extraction of the heat.
Meanwhile, examples of such thermal storage bodies taking advantage of latent heat include inorganic hydrated salts and hydrocarbons such as paraffins. However, it is known that inorganic hydrated salts generally show great supercooling, which results in serious drawbacks for real use: namely, freezing is hindered even below the melting point, and specific heat released is substantially reduced.
For these reasons, researches have been widely conducted to develop thermal storage agents from oil-soluble substances (oily substances) composed of paraffins and other hydrocarbons. Among them, oil-soluble substances such as paraffins and higher alcohols are attracting a large attention, because they release as comparatively large a amount of melting latent heat as approximately 40 cal/g to 60 cal/g, exceeding 30 cal/g, by a transformation from solid phase to liquid phase and vice versa, and also because they can offer any melting point ranging from as low as -20.degree. C. to as high as 100.degree. C. depending on the kind and/or mixture thereof.
The oil-soluble substances have disadvantages too: Since most of the oil-soluble substances are inflammable, when in liquid phase, they may leak, catch fire and spread easily. And paraffins and other hydrocarbons, when left at high temperatures for a long period of time, deteriorate in physical property and show supercooling, which causes serious negative effects.
To solve the disadvantage of the deterioration in physical property and the resultant supercooling, which causes serious negative effects, of paraffins and other hydrocarbons when left at high temperatures for a long period of time, it has been suggested to prevent supercooling by adding a nucleating agent (core forming agent) such as zeolite particles to paraffins and other hydrocarbons. However, such a nucleating agent still fails to produce enough of the potential effects thereof with hydrocarbons, because the nucleating agent is separated during use, especially when the hydrocarbons are in liquid phase, from the hydrocarbons in liquid phase due to the difference in specific weight.
When such hydrocarbons including paraffins are used as thermal storage agents for storing latent heat, since the hydrocarbons are used indoors in a large quantity, some preventive measures should be taken against the leakage thereof fr
REFERENCES:
patent: 5565132 (1996-10-01), Salyer
Patent Abstracts of Japan, Abstract No. JP402302489A, Japanese Patent Specification No. 02-302489, Dec. 1990.
Patent Abstracts of Japan, Abstract No. JP409310064A, Japanese Patent Specification No. 09-310064, Dec. 1997.
WPIDS Abstract No. 94-112004, abstract of Japanese Patent Specification No. 94-112004, Mar. 1994.
WPIDS Abstract No. 98-563433, abstract of Japanese Patent Specification No. 10-251627, Sep. 1998.
Gomi Tomoki
Irie Yoshio
Shimomura Tadao
Green Anthony
Nippon Shokubai Co. , Ltd.
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