Refrigeration – Refrigeration producer – Sorbent type
Patent
1999-12-02
2000-11-07
Doerrler, William
Refrigeration
Refrigeration producer
Sorbent type
62483, 62141, F25B 1500
Patent
active
061419877
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an absorption refrigeration system and to a solvent-refrigerant operating combination for use in an absorption refrigeration system.
BACKGROUND OF THE INVENTION
Currently, there are three known types of absorption refrigeration systems: The single-separation absorption system, the single absorption and recompression system, and the double-absorption system.
Of these three systems, the double-separation-effect absorption system is the one that permits obtaining the coefficient of frigorific performance (COP) which is defined as the ratio between the amount of heat absorbed at the cold source and the amount of calorific energy absorbed at the source of the highest motive heat.
This coefficient of frigorific performance, or COP, is thus representative of the output of the refrigeration system. Yet even with a double separation absorption refrigeration system the COP does not go beyond a value of 1 while in theory the COP should be able to reach a value of 1.3.
SUMMARY OF THE INVENTION
The invention is aimed at remedying that shortcoming.
To that effect a double separation absorption refrigeration system is proposed which is comprised primarily of: (a) a first high-pressure, high-temperature generator, (b) a second generator with a lower pressure and temperature than the first generator, feeding by way of refrigerant vapor ducting a condenser at the same pressure as the second generator but at a temperature lower than that of the second generator, (c) a condenser at the same pressure as the said second generator but at a temperature lower than that of the latter; (d) an evaporator at a pressure and temperature lower in each case than that of the condenser; (e) an absorber at the same pressure as the evaporator and the same temperature as the condenser; and (f) a compression device positioned in the ducting that feeds the first generator with a refrigerant-rich solution which solution is derived from the absorber, the system characterized in that the said condenser is at a pressure greater than that of the said second generator yet lower than that of the said first generator.
According to another characteristic feature of the refrigeration system of this invention, the condenser pressure is produced by compressing the refrigerant vapors emanating from the said second generator by means of a vapor compression device located in the ducting that feeds the refrigerant vapor to the said condenser.
According to yet another characteristic feature of the refrigeration system of this invention, the said refrigerant-rich solution is a solvent-refrigerant operating combination where the solvent is a compound selected from the methyl phenol group, taken either individually or as a mixture.
According to still another characteristic feature of the refrigeration system of this invention, the said methyl phenols are orthocresol, metacresol and paracresol.
Also proposed by this invention is a solvent-refrigerant operating combination for use in an absorption refrigeration system characterized in that the refrigerant is a compound selected from the methyl phenol group, taken individually or as a mixture, and that the solvent is methanol.
According to a characteristic feature of the operating combination per this invention, the said methyl phenols are orthocresol, metacresol and paracresol.
BRIEF DESCRIPTION OF THE DRAWINGS
This invention will be better understood, and its other purposes, characteristics, details and advantages will become more clearly evident, by means of the following explanatory description provided in reference to the attached figures in which:
FIG. 1 is a schematic illustration of a prior-art double-separation absorption refrigeration system, indicating the operational conditions of each element in terms of pressure and temperature, the abscissa showing the temperature, the Y-coordinate showing the pressure, and
FIG. 2 is a schematic representation of the refrigeration system according to this invention, indicating the operational conditions of each
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Database WPI, Section Ch, Week 8437, Derwent Publications Ltd., London, GB; Class J07, AN 84-230474, XP002043540 & SU 1 068 672 A (Shleinikov V M), Jan. 23, 1984.
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Huor Meng Heng
Le Halpere Gilles
Prevost Michel
Soide Isabelle
Doerrler William
Gaz de France
Shulman Mark
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