Method for operating a cooling system and a cooling system

Patent metadata

Field	Value
Publication number	US-10132532-B2
Application number	US-201214343215-A
Country	US
Kind code	B2
Filing date	Sep 4, 2012
Priority date	Sep 6, 2011
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The invention relates to a method for operating a cooling system, in which a cooling agent is prepared in a reservoir of an evaporator device ( 1 ) of a single- or multi-stage sorption cooling system, a fluid to be cooled is cooled by having a heat exchanger of the evaporator device ( 1 ) effect a cooling heat transfer from the fluid to be cooled to the cooling agent for cooling purposes, and the cooling heat transfer causes the cooling agent to at least partially evaporate on the heat exchanger, and the evaporated cooling agent is relayed to a liquefier device ( 2 ), wherein the cooling heat transfer is improved by conveying external thermal energy provided by an external heat source ( 10 ) to the cooling agent, specifically in addition to and separately from the cooling heat transfer, and thereby initiating bubble formation that supports cooling heat transfer in the cooling agent in the reservoir, specifically by inducing bubble formation in conjunction with supplying the external thermal energy or intensifying bubble formation triggered by the cooling heat transfer. In addition, the invention relates to a cooling system in single- or multi-state configuration.

First claim

The invention claimed is:

1. A method for operating a cooling system, comprising the following steps:
a cooling agent is prepared in a reservoir of an evaporator device of a single- or multi-stage sorption cooling system;
a fluid to be cooled is cooled by having a heat exchanger of the evaporator device effect a cooling heat transfer from the fluid to be cooled to the cooling agent for cooling purposes, and
the cooling heat transfer causes the cooling agent to at least partially evaporate on the heat exchanger, and the evaporated cooling agent is relayed to a liquefier device,
wherein the cooling heat transfer is improved by conveying external thermal energy provided by an external heat source to the cooling agent in the evaporator while the fluid is being cooled in the cooling system, specifically in addition to and separately from the cooling heat transfer, and thereby initiating bubble formation by a pool-boiling process that supports cooling heat transfer in the cooling agent in the reservoir, specifically by inducing bubble formation in conjunction with supply the external thermal energy or intensifying bubble formation triggered by the cooling heat transfer.

2. The method according to claim 1 , wherein in conjunction with the supply of external thermal energy, a boiling state or boiling-like state is induced for the cooling agent in the reservoir, which respectively encompasses bubble formation.

3. The method according to claim 1 , wherein in that the cooling agent in the reservoir is supplied with at least part of the external thermal energy by mixing a substance into the cooling agent.

4. The method according to claim 1 , wherein the cooling agent in the reservoir is supplied with at least part of the external thermal energy via thermal transfer not involving the use of substances.

5. The method according to claim 1 , wherein the external thermal energy is supplied by a streaming fluid, whose fluid temperature is higher than the temperature of the cooling agent in the reservoir, at least prior to conveying the external thermal energy to the cooling agent.

6. The method according to claim 1 , wherein the external thermal energy is supplied by a streaming fluid, whose fluid temperature is higher than the temperature of the fluid to be cooled, at least prior to cooling via the transfer of cooling heat energy from the fluid to be cooled to the cooling agent.

7. The method according to claim 1 , wherein one or more line segments of the heat exchanger in the evaporator device that carry the fluid to be cooled are designed to at least partially dip into the cooling agent in the reservoir.

8. The method according to claim 1 , wherein one or more of the line segments of the heat exchanger in the evaporator device that carry the fluid to be cooled are sprinkled with the cooling agent from the reservoir.

9. The method according to claim 1 , wherein the external thermal energy is supplied as heat from one of the following processes: Exhaust heat from a technological process, heat from cogeneration, solar heat and geothermal heat, and heat from a process-internal fluid stream in the cooling system.

10. Cooling system in a single- or multi-stage configuration, comprising:
an evaporator device configured to transfer cooling heat energy from a fluid to be cooled to a cooling agent provided in a reservoir and used in circulation by means of a heat exchanger for cooling the fluid to be cooled, and thereby at least partially evaporating the cooling agent on the heat exchanger;
a liquefying device that is fluidically connected with the evaporator device and configured to absorb/adsorb the evaporated cooling agent in a solvent;
an ejector drift/desorber device fluidically connected with the liquefying device and configured to expel the cooling agent absorbed by the solvent by expending useful heat, and
a liquefier fluidically connected with the ejector drift/desorber device and the evaporator device and configured to liquefy the expelled cooling agent and dispense the liquefied cooling agent for transfer to the evaporator device;
wherein the evaporator device is coupled to a heat supplying device configured to convey external thermal energy provided by an external heat source to the cooling agent in the reservoir, specifically in addition to and separately from the cooling heat transfer from the fluid to be cooled to the cooling agent, specifically inducing bubble formation by a pool-boiling process in conjunction with supplying the external thermal energy or intensifying bubble formation triggered by the cooling heat transfer.

11. The method according to claim 2 , wherein in that the cooling agent in the reservoir is supplied with at least part of the external thermal energy by mixing a substance into the cooling agent.

Assignees

• Petersen Stefan
• Gueido Walther Huels
• Univ Berlin Tech

Inventors

• Petersen Stefan
• Güido Walther Hüls

Classifications

• F25B39/026

  specially adapted for sorption type systems · CPC title

• F25B27/00

  Machines, plants or systems, using particular sources of energy (F25B30/06 takes precedence) · CPC title

• F25B15/008 Primary

  with multi-stage operation (F25B15/006 takes precedence) · CPC title

• F25B2315/00

  Sorption refrigeration cycles or details thereof · CPC title

• F25B15/00 Primary

  Sorption machines, plants or systems, operating continuously, e.g. absorption type · CPC title