CAPILLARY-PUMPING HEAT-TRANSPORT DEVICE

• US 20150083373A1
• Filed: 09/12/2012
• Published: 03/26/2015
• Est. Priority Date: 09/14/2011
• Status: Active Grant

• Current Assignee: Euro Heat Pipes SA
• Original Assignee: Euro Heat Pipes SA
• Inventors: Dupont, Vincent
• Granted Patent: US 9,958,214 B2
• Time in Patent Office: Days
• US Class Current: 165/104.26
• CPC Class Codes: F28D 15/043 forming loops, e.g. capillary pumped loops
• CPC Class Codes: F28D 15/046 characterised by the material or the construction of the capillary structure

Abstract

A capillary-driven heat transfer device, adapted to extract heat from a heat source and to release this heat to a cold source by means of a two-phase working fluid, includes an evaporator, having a microporous mass adapted to perform capillary pumping of fluid in the liquid phase, a condenser, a reservoir having an inlet and/or outlet port, a vapor communication circuit connecting the outlet of the evaporator to the inlet of the condenser, and a liquid communication circuit connecting the outlet of the condenser to the reservoir and to the inlet of the evaporator. The reservoir includes multiple separate volumes that remain in fluid communication.

Claims

1. A capillary-driven heat transfer device under the influence of gravity, adapted to extract heat from a heat source and to release this heat to a cold source by means of a two-phase working fluid contained in a closed general circuit, comprising:

an evaporator, having an inlet and an outlet, and a microporous mass adapted to perform capillary pumping of fluid in the liquid phase

a condenser, having an inlet and an outlet,

a reservoir having an inner chamber, and at least one inlet and/or outlet port, the inner chamber having a vapor phase portion located on top of a liquid phase portion,

a first communication circuit, for fluid mainly in the vapor phase, connecting the outlet of the evaporator to the inlet of the condenser,

a second communication circuit, for fluid mainly in the liquid phase, connecting the outlet of the condenser to the reservoir and to the inlet of the evaporator,

wherein the reservoir includes plural separate volumes of the liquid phase, said separate volumes remaining in fluid communication, the reservoir including a plurality of inner partitions forming compartments adapted to separate said plural separate volumes of the liquid phase,

said plural separate volumes communicating through small cross-sectional passages, in order to create hydraulic damping between the separate volumes of the liquid phase.

2. A device according to claim 1, wherein the liquid phase does not go over an upper edge of the partitions.

3. A device according to claim 1, wherein the plurality of inner partitions form a regular compartment structure.

4. A device according to claim 1, wherein the reservoir includes a macroporous structure and the compartments are deprived of a microporous structure.

5. A device according to claim 4, mainly under the influence of the Earth'"'"'s gravity, wherein the partitions form inclined or vertical separating walls.

6. A device according to claim 4, wherein the compartment structure takes the form of a honeycomb structure.

7. A device according to claim 4, wherein the compartment structure includes a phase change material providing thermal inertia.

8. A device according to claim 1, wherein the at least one inlet and/or outlet port includes an inlet port and the reservoir includes an input stream deflector near the inlet port of the reservoir.

9. A device according to claim 1, wherein the reservoir is located next to the evaporator, or the reservoir is integrated into the evaporator.

10. A device according to claim 1, including a non-return device arranged between the inner chamber of the reservoir and the microporous mass of the evaporator, and arranged to prevent the liquid present in the evaporator from moving into the inner chamber of the reservoir.

11. A device according to claim 10, mainly under the influence of the Earth'"'"'s gravity, wherein the non-return device includes a float.

12. A heat transfer device according to claim 1, wherein the heat transfer device is deprived of a mechanical pump.

13. A device according to claim 1, wherein the evaporator, condenser, reservoir, first communication, circuit, and second communication circuit are part of a loop, the device additionally including an energy-providing element at the reservoir to control the-pressurisation of the loop during startup.

14. A device according to claim 1, wherein the small cross-sectional passages have a cross-section that is less than 1/10 of the largest cross-section of the reservoir.