Triem T Hoang

US Patent:

20030159808, Aug 28, 2003

Filed:

Dec 20, 2002

Appl. No.:

10/324005

Inventors:

Triem Hoang - Clifton VA, US

International Classification:

F28D015/00

US Classification:

165/104260, 165/104240

Abstract:

An Advanced Loop Heat Pipe (“ALHP”) apparatus, for passively transporting waste heat over a long distance and rejecting it to a heat sink for heat rejection, an evaporator capillary pump (“ECP”) for heat acquisition, includes a reservoir for storing the working fluid of the ALHP, an auxiliary pump for vapor management of the liquid side of the loop, a primary condenser for condensation of vapor from the ECP, and a secondary condenser for condensation of vapor from the reservoir. The reservoir, ECP, and condenser are connected by transport lines to provide a conduit for the working fluid to flow from one component to another. The reservoir also connects to the auxiliary pump by an auxiliary pump transport line via the condenser. The auxiliary pump further connects to the condenser by a vapor transport line.

US Patent:

20060162365, Jul 27, 2006

Filed:

Feb 21, 2006

Appl. No.:

11/256007

Inventors:

Triem Hoang - Clifton VA, US
Michael Brown - Columbia MD, US

International Classification:

F25D 23/12
F28D 5/00

US Classification:

062259200, 062310000

Abstract:

A two-fluid-phase cooling device for absorbing high thermal flux from electronics devices and other thermally dissipating devices. It consists of a thermally conductive plate with thermally dissipating elements on one face and a semi-toroidal cavity in the opposite face with the cavity's axis perpendicular to the face of the plate, a liquid refrigerant supply tube ending in a thermodynamic cycle's refrigeration expansion valve that directs jets of liquid to impact the conical surface in the center region of the semi-toroidal cavity in a direction along the cavity's axis and tangent to the conical surface, a second plate with a semi-toroidal protrusion extending into the semi-toroidal cavity to form a thin, semi-toroidal channel between the two plates, and a seal between the liquid supply tube and the second semi-toroidal plate. In operation liquid refrigerant jets strike the conical surface generally tangential to the surface and flow at high velocity in a thin film on the surface of the semi-toroidal cavity from its center radially to the outer edge of the toroidal channel, absorbing heat and boiling as it does so. The high radial acceleration forces caused by the liquid film moving at high velocity on the cavity's concave surface force the liquid film against the surface and create a pressure gradient that biases evaporation toward the liquid/vapor interface. The vapor moves parallel to the liquid flow radially outwards between the liquid film and the surface of the semi-toroidal protrusion at very high velocity, causing extreme turbulence in the liquid film and highly augmented heat transfer between the heated plate and the liquid film, while the liquid film nevertheless remains intact and forced against the heated surface by radial acceleration and carried to a distance significantly greater than in conventional jet impingement systems. The device may also be composed of wedge-shaped sections of the semi-toroidal plates. It may further have two expansion valves in series in the liquid supply line, the first generating a small amount of vapor (increase in quality) so the resulting increase in flow volume greatly increases the velocity through the second expansion valve toward the heated surface to further enhance heat transfer.

US Patent:

20130306278, Nov 21, 2013

Filed:

Aug 9, 2012

Appl. No.:

13/570823

Inventors:

Triem T. Hoang - Clifton VA, US

International Classification:

F28D 15/04

US Classification:

16510426

Abstract:

A capillary flow valve for use in a two phase heat transfer system such as a loop heat pipe, including an inlet port for receiving working fluid in a vapor-phase, an outlet port for outputting working fluid in a vapor-phase, and a porous wick material extending across the interior of the valve. Heating the wick evaporates liquid-phase working fluid from the wick and allows the vapor-phase working fluid to pass through the wick to the outlet port. Removing the heat allows liquid to condense in the wick, preventing flow of the vapor-phase working fluid through the wick to the outlet port.

US Patent:

20210302104, Sep 30, 2021

Filed:

Mar 23, 2021

Appl. No.:

17/210407

Inventors:

- Arlington VA, US
Evan Hyde - Washington DC, US
Jesse Maxwell - Washington DC, US
Kwok Cheung - Washington DC, US
Robert Baldauff - Washington DC, US
Triem Hoang - Laurel MD, US

International Classification:

F28D 15/02
F28D 15/04
F04D 29/058

Abstract:

A hybrid capillary and mechanically pumped loop heat pipe (HLHP) includes a fluid loop having, an evaporator thermally coupled to a heat load, a condenser thermally coupled to a heat sink, a reservoir, and one or more magnetically levitating pumps configured to pump fluid through the loop thereby improving heat transport capacity and system stability without compromising maintenance-free, long life operation of a conventional loop heat pipe.

US Patent:

20180340739, Nov 29, 2018

Filed:

Jul 23, 2018

Appl. No.:

16/042663

Inventors:

- Arlington VA, US
Triem T. Hoang - Clifton VA, US

International Classification:

F28D 15/04
F28D 15/06

Abstract:

A two-phase heat transfer system including at least one two-phase evaporator, at least one condenser, a vapor conduit joining a vapor outlet of the two-phase evaporator to an inlet of the condenser, a liquid conduit joining an outlet of the condenser to a liquid inlet of the two-phase evaporator, and a thermally-actuated capillary flow valve. The thermally-actuated capillary flow valve having a valve inlet, a valve outlet, a thermal connection to a heat sink for cold biasing the capillary flow valve, a porous wick extending across the flow passageway of the capillary flow valve, and a heater thermally connected to the capillary flow valve, where actuation of the heater evaporates liquid in the porous wick to allow passage of vapor through the capillary flow valve.

US Patent:

20150345872, Dec 3, 2015

Filed:

Aug 10, 2015

Appl. No.:

14/822612

Inventors:

Triem T. Hoang - Clifton VA, US

Assignee:

The Government of the US, as Represented by the Secretary of the Navy - Washington DC

International Classification:

F28D 15/06

Abstract:

A capillary flow valve for use in a two phase heat transfer system such as a loop heat pipe, including an inlet port for receiving working fluid in a vapor-phase, an outlet port for outputting working fluid in a vapor-phase, and a porous wick material extending across the interior of the valve. Heating the wick evaporates liquid-phase working fluid from the wick and allows the vapor-phase working fluid to pass through the wick to the outlet port. Removing the heat allows liquid to condense in the wick, preventing flow of the vapor-phase working fluid through the wick to the outlet port.