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Absorption Cycle System Having Dual Absorption Circuits

Inactive Publication Date: 2012-12-06
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]With such a system, the additional absorber can be operated at lower temperatures than a traditional absorber which circulates lithium bromide and water as the absorbent / refrigerant mixture. A lower feasible absorber operating temperature is expected to enable novel cooling and heating applications especially for low ambient temperatures. A lower feasible absorber operating temperature is expected to also enable higher cycle energy efficiency, which is expressed in the industry as a higher coefficient of performance, or COP.
[0009]In addition, the use of two absorption circuits allows the simultaneous use of thermally sensitive absorbents (such as thermally sensitive ionic compounds or absorbent formulations containing thermally sensitive crystallization suppressants or other thermally sensitive additives) in one circuit and high-temperature heat sources in the other circuit.
[0011]According to another embodiment of the present invention, some of the heat from the high pressure refrigerant vapor may be recovered and transferred to the first generator, instead of being rejected at the condenser. This results in higher energy efficiency. Thus, in accordance with this embodiment, the absorption cycle system of the present invention includes a heat recovery line extending between the second generator and through the first generator for recovering heat from the refrigerant exiting the second generator. The heat recovery line continues from the first generator to the condenser, for delivering the refrigerant vapor to the condenser.

Problems solved by technology

However, a drawback of such a standard system, which typically uses lithium bromide and water as the absorbent / refrigerant pair, is that the minimum feasible absorber operating temperature is limited by the crystallization temperature of the absorbent / refrigerant mixture.

Method used

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  • Absorption Cycle System Having Dual Absorption Circuits
  • Absorption Cycle System Having Dual Absorption Circuits
  • Absorption Cycle System Having Dual Absorption Circuits

Examples

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second embodiment

[0026]FIG. 2 shows an absorption cooling system of the present invention. Such a system is generally shown at 110. The system includes an evaporator 110-1 disposed in fluid communication with a first absorption circuit, shown generally at 120 in FIG. 2, a second absorption circuit, shown generally at 130 in FIG. 2, disposed in fluid communication with the first absorption circuit, and a condenser 110-2 disposed in fluid communication with the second absorption circuit and the evaporator.

[0027]The evaporator of the system of the present invention includes an inlet line 114 for delivering a refrigerant to the evaporator. Again, the refrigerant in the system of the second embodiment of the present invention is water, it being understood that other refrigerants may be used in this system. The evaporator of the second embodiment operates in the same way that the evaporator of FIG. 1 does. Thus, refrigerant is partially evaporated liquid when it enters the evaporator. The evaporator also ...

first embodiment

[0033]Second pump 130-2 pumps the high refrigerant-content second-absorbent / refrigerant mixture via a line 131 to the second heat exchanger 130-3, which, like the first heat exchanger, may be a shell and tube type heat exchanger. The second heat exchanger pre-heats the said mixture before it enters the second generator 130-4 via a line 132. The second generator is supplied with high-temperature heat from any suitable external source. In one embodiment, within the second generator is a bundle of tubes (not shown) which carry combustion gases, steam, or hot water which are supplied to the generator via a line 133. The combustion gases, steam or hot water transfer heat into the high refrigerant-content second-absorbent / refrigerant mixture. The heat causes the mixture to release refrigerant vapor, which exits from the second generator through a heat recovery line 136a, leaving a low refrigerant-content mixture behind in the second generator. The refrigerant is now a high pressure vapor,...

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Abstract

An absorption cycle system utilizes an additional absorption circuit in conjunction with a traditional absorption circuit. The absorbent used in the additional absorption circuit could contain an ionic compound, or any absorbent with relatively low crystallization. Mixtures of such absorbent with water remain liquid at temperatures lower than the minimum feasible operating temperature of the traditional lithium bromide water absorbent solutions of the prior art.

Description

BACKGROUND[0001]1. Field of the Disclosure[0002]The present disclosure relates to an absorption cycle system which has dual absorption circuits. Such a system is useful in a wide range of absorption cycle applications including low temperature refrigeration, comfort air conditioning and space heating.[0003]2. Description of Related Art[0004]Single effect absorption cycle systems with a single absorption circuit are known in the art. In a typical absorption cycle system, a refrigerant, such as water vapor, is absorbed into an absorbent mixture, such as an aqueous lithium bromide (LiBr) solution, and then is released out of the absorbent mixture. The absorber is part of a single absorption circuit, which includes a pump, a heat exchanger, an expansion or pressure reduction device and a generator, where the refrigerant is released from the absorbent mixture before it enters a condenser and an evaporator.[0005]However, a drawback of such a standard system, which typically uses lithium b...

Claims

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Application Information

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IPC IPC(8): F25B15/00
CPCY02B30/62F25B15/006Y02A30/27
Inventor KONTOMARIS, KONSTANTINOS
Owner EI DU PONT DE NEMOURS & CO
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