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A mixture to be used in an absorption machine

a technology of mixture and absorption machine, which is applied in the field of mixture, can solve the problems of increasing the vapor pressure in the system, reducing the efficiency of the absorption machine, and reducing the utilization of temperature difference, so as to achieve simple and inexpensive manufacturing, increase the efficiency of the absorption machine, and increase the effect of

Inactive Publication Date: 2018-09-06
CLIMATEWELL AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is aimed at improving absorption machines by increasing efficiency, increasing delta T, and making machines smaller and less expensive to manufacture. The main technical effects are increased power and energy storage capacity in a compact machine. Additionally, the liquid matrix used in the absorption process is simple and affordable to produce.

Problems solved by technology

Thus it is a problem how to improve the temperature difference ΔT utilized by a chemical heat pump.
It is further a problem how to increase the power of a chemical heat pump as well as how to reduce its size and weight.
In view of U.S. Pat. No. 3,312,077 it is further a problem how to increase the vapor pressure in the system.

Method used

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  • A mixture to be used in an absorption machine
  • A mixture to be used in an absorption machine
  • A mixture to be used in an absorption machine

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041]An experiment using the first compartment of the device, a reactor. The first compartment comprises LiI.3H2O and NH3. LiI.3H2O is present as soft crystals in pure form. When mixed with NH3 at room temperature NH3 is absorbed by LiI.3H2O. From experience it is known that when about 1.4 HN3 molecule per LiI.3H2O has been absorbed the salt starts to become liquid.

[0042]The example is not a complete absorption machine, but instead the reactor part (first compartment) is investigated in a model in order to study the heat transfer capability of the material. The setup is described schematically in FIG. 5 with an amount of liquid LiI.3H2O and NH3 (1), a space (2) above the liquid-gas interface, a heat exchanger (3), a spray nozzle (4), a pump (5) for the liquid LiI.3H2O and NH3, a thermometer (6), a pump (7) for a heat transferring medium, en electrical heater (8) and a thermometer (9) for the heat transferring medium.

[0043]The first compartment comprises a lithium iodide trihydrate ...

example 2

[0047]The experiment was repeated with a different content in the compartment. Graphene was added to the system in order to investigate its influence on the heat transfer properties.

[0048]Graphene was added in a suspension in water to lithium iodide trihydrate. The concentration of graphene in the suspension in water was 0.2 wt %. The graphene was in the form of thin flakes with a size in the interval 0.1-1 μm. 1 kg lithium iodide trihydrate was used. Then the water solution comprising graphene was evaporated until lithium iodide trihydrate remained. Water was evaporated and the weight was measured so that the weight corresponded to lithium iodide trihydrade and graphene. Thus all added water was removed. This mixture was allowed to absorb 3 molecules of ammonia per LiI.3H2O. LiI.3H2O was kept in a chamber where the ambient air was pumped out whereafter the desired volume of NH3 was added. Only an amount of water corresponding to the hydrate was left.

[0049]The experiment in example ...

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PUM

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Abstract

There is disclosed an absorption machine comprising at least a first and a second compartment in fluid connection with each other, wherein the first compartment comprises at least one salt selected from the group consisting of LiBr, Lil, LiCl, Nal, and NH4I and wherein at least the first compartment comprises NH3 in an amount sufficient to form a liquid together with the at least one salt in the first compartment. Advantages of using the new mixture include that an absorption machine using a salt and NH3 can be made smaller and lighter with the same power. Further ΔT can be improved. The vapour pressure of NH3 in the system can be kept relatively high.

Description

TECHNICAL FIELD[0001]The present invention relates generally to a mixture to be used in an absorption machine such as a chemical heat pump as well as a chemical heat pump including such a mixture.BACKGROUND[0002]Generally chemical heat pumps and absorption machines are known. Such devices typically comprise an absorbing material or substance / mixture and a volatile liquid.[0003]Lithium iodide is known for use in for instance batteries. There exist an anhydrous form as well as a monohydrate, a dihydrate, and a trihydrate of lithium iodide. Also other hygroscopic salts are known which form hydrates with water.[0004]U.S. Pat. No. 3,312,077 discloses a lithium iodide-ammonia solution used as the absorbent and ammonia used as the refrigerant in an absorption refrigeration system. The system does not contain water according to the description.[0005]Thus it is a problem how to improve the temperature difference ΔT utilized by a chemical heat pump. It is further a problem how to increase the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B30/04F25B15/04F25B15/06
CPCF25B30/04F25B15/04F25B15/06F25B15/02Y02B30/62Y02A30/27F25B37/00F25B49/043C09K5/04C09K5/047F25B17/08F25B2315/003
Inventor BOLIN, GÖRANOLSSON, RAY
Owner CLIMATEWELL AB