Method for transporting cold latent heat and system therefor

Details Method for transporting cold latent heat and system therefor Method for transporting cold latent heat and system therefor

1999-09-27

2001-05-29

Doerrler, William (Department: 3744)

Refrigeration

Chemical reaction or solids dissolving

Reexamination Certificate

active

06237346

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for transporting cold latent heat and a system therefor.
2. Description of the Related Art
Conventionally, as a medium for transporting cold latent heat, there has been considered a gaseous hydrate.
Such kind of gaseous hydrate is called as a clathrate hydrate, which is a compound capable of crystallization when incorporating, as a guest, methane, ethane, propane, freon
11
, freon
12
and some other gaseous molecules into basket-like lattices consisting of water molecules.
Then, such kind of gaseous hydrate has a crystallizing temperature (critical decomposing temperature) which is in a range of 5 to 20° C., a temperature higher that its freezing point. Further, its heat of formation is 70 to 90 cal/g which is close to the latent heat of ice. In view of the above physical properties, it has long been in discussion and consideration that people should make use of the characteristics of such gaseous hydrate so that it can serve as a regenerative medium for heat accumulation or act as a transporting medium for transporting cold latent heat.
However, it has been well know that freonic hydrates serving as primary components forming the above gaseous hydrate are associated with a problem of polluting the surrounding environment, such as a problem of destroying the ozone layer. Moreover, since the gaseous hydrates are associated with an extremely high pressure at their critical decomposing temperatures, and sometimes require the use of a vacuum pressure, such gaseous hydrates are difficult to be put into practical use.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for transporting cold latent-heat, so as to solve the problem of polluting the surrounding environment.
A method for transporting cold latent-heat according to the present invention is characterized in that a cold transporting medium for use in the method is a semi-clathrate hydrate (liquid-liquid clathrate) capable of crystallization when an onium salt having C
4
H
9
group and iso-C
5
H
11
group is included as a guest into basket-like clathrate lattices consisting of water molecules.
Here, the onium salt is an ammonium salt, a phosphonium salt, or a sulfonium salt. Further, with the semi-clathrate hydrate (which is also called a liquid-liquid clathrate, or liquid-liquid clathrate hydrate), since the guest is not in a gaseous state, the crystalline structure of the hydrate is more complex than that of a gaseous hydrate.
Moreover, the above semi-clathrate hydrate is characterized in that the guest is tetra n-butyl ammonium bromide ([CH
3
(CH
2
)
3
]
4
NBr, abbreviated as: TBAB). However, it is also possible to use another tetra n-butyl ammonium salt in which the above bromine (Br) may be replaced by F, Cl, CHO
4
, CH
3
CO
2
, HCO
3
, OH, NO
3
, CrO
3
, or WO
4
.
Further, a cold latent heat transporting system comprises a pipeline for supplying a semi-clathrate hydrate to a plurality of equipments which include heat exchangers and require cold latent heat; a pipeline for recovering into at least one clathrate formation apparatus a medium which is formed by absorbing heat so that the hydrate is partially or completely changed into a liquid.
Moreover, each of the pipeline for supplying a liquid-liquid clathrate and the pipeline for recovering the clathrate into a clathrate regenerating apparatus, is connected with a storage container.
On the other hand, the melting point of the liquid-liquid clathrate may be changed by adjusting the concentration of the guest, corresponding to an amount of heat for use in equipment in which cold latent heat is needed.
Furthermore, at least one of the clathrate formation apparatus is a heat drive type refrigerating machine such as an absorption refrigerating machine and an adsorption refrigerating machine, wherein steam of a middle temperature to a low temperature and warm water are used as a heat source for the refrigerating machine.
In addition, the cold latent heat transporting system is provided together with an absorbing type air dehumidifying system, wherein exhaust heat from the steam absorbing type refrigerating machine is used as a heat source for regenerating the absorptive solution from the absorbing type dehumidifying system.


REFERENCES:
patent: 3243966 (1966-04-01), Glew
patent: 4051888 (1977-10-01), Yamada et al.
patent: 5057132 (1991-10-01), Lebrun et al.
patent: 10-259978 (1998-09-01), None

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