Desikan Bharathan

7190581, Mar 13, 2007

Jan 11, 2005

11/032771

Vahab Hassani - Denver CO, US
Andreas Vlahinos - Castle Rock CO, US
Desikan Bharathan - Arvada CO, US

Midwest Research Institute - Kansas City MO

H05K 7/20

361699, 361688, 361698, 165 803, 165 804, 622592

A power module assembly with low thermal resistance and enhanced heat dissipation to a cooling medium. The assembly includes a heat sink or spreader plate with passageways or openings for coolant that extend through the plate from a lower surface to an upper surface. A circuit substrate is provided and positioned on the spreader plate to cover the coolant passageways. The circuit substrate includes a bonding layer configured to extend about the periphery of each of the coolant passageways and is made up of a substantially nonporous material. The bonding layer may be solder material which bonds to the upper surface of the plate to provide a continuous seal around the upper edge of each opening in the plate. The assembly includes power modules mounted on the circuit substrate on a surface opposite the bonding layer. The power modules are positioned over or proximal to the coolant passageways.

7373904, May 20, 2008

Jun 12, 2001

10/258719

Desikan Bharathan - Lakewood CO, US
Vahab Hassani - Golden CO, US

Midwest Research Institute - Kansas City MO

F27B 37/26

122489, 60653, 60679

A stratified vapor generator () comprises a first heating section (H) and a second heating section (H). The first and second heating sections (H, H) are arranged so that the inlet of the second heating section (H) is operatively associated with the outlet of the first heating section (H). A moisture separator () having a vapor outlet () and a liquid outlet () is operatively associated with the outlet () of the second heating section (H). A cooling section (C) is operatively associated with the liquid outlet () of the moisture separator () and includes an outlet that is operatively associated with the inlet of the second heating section (H).

7859846, Dec 28, 2010

Oct 18, 2005

11/569248

Vahab Hassani - Denver CO, US
Andreas Vlahinos - Castle Rock CO, US
Desikan Bharathan - Arvada CO, US

Alliance for Sustainable Energy, LLC - Golden CO

H05K 7/20

361702, 36167953, 361704, 361699, 165 803, 165 8041, 622592

A power module assembly () with low thermal resistance and enhanced heat dissipation to a cooling medium. The assembly includes a heat sink or spreader plate () with passageways or openings () for coolant that extend through the plate from a lower surface () to an upper surface (). A circuit substrate () is provided and positioned on the spreader plate () to cover the coolant passageways. The circuit substrate () includes a bonding layer () configured to extend about the periphery of each of the coolant passageways and is made up of a substantially nonporous material. The bonding layer () may be solder material which bonds to the upper surface () of the plate to provide a continuous seal around the upper edge of each opening () in the plate. The assembly includes power modules () mounted on the circuit substrate () on a surface opposite the bonding layer (). The power modules () are positioned over or proximal to the coolant passageways.

20030167769, Sep 11, 2003

Mar 31, 2003

10/258718

Desikan Bharathan - Arvada CO, US
Vahab Hassani - Denver CO, US

F01K001/00
F01K013/00

060/676000, 060/670000

A power generating system () comprising a heat source () and an incremental vapor generator system () operatively associated with the heat source (). The incremental vapor generator system () includes a first heating section () and a second heating section (). The first heating section () receives a mixed working fluid () and generates a first heated working fluid stream comprising a vapor portion () and a liquid portion. The second heating section () is operatively associated with the first heating section () and receives the liquid portion from the first heated working fluid stream. The second heating section () generates a second heated working fluid stream comprising a vapor portion (). An energy conversion device () operatively associated with the incremental vapor generator system () converts into useful work heat energy contained in the vapor portions () of the first and second heated working fluid streams.

20040211184, Oct 28, 2004

Apr 4, 2003

10/407415

Desikan Bharathan - Arvada CO, US
Keith Gawlik - Boulder CO, US

F01K025/08

060/651000

An exemplary heat exchange system includes a first stage including a first stage heat exchanger and a tower wherein the first stage heat exchanger exchanges heat between a fluid and air to thereby heat the air and generate air convection in the tower; and a second stage including a second stage heat exchanger and a powerable convection unit wherein the second stage heat exchanger receives the fluid from the first stage and exchanges heat between the fluid and air. An exemplary method includes transferring heat energy from a fluid to air using a first heat exchanger to cause air convection in a tower; and transferring heat energy from the fluid to air using a second heat exchanger and a fan. Various other exemplary systems and methods are also disclosed.

56616708, Aug 26, 1997

May 25, 1995

8/452584

Desikan Bharathan - Lakewood CO
A. Vahab Hassani - Golden CO

Midwest Research Institute - Kansas City MO

G09B 900

364578

The present invention is a system and method for simulating the performance of a cooling tower. More precisely, the simulator of the present invention predicts values related to the heat and mass transfer from a liquid (e. g. , water) to a gas (e. g. , air) when provided with input data related to a cooling tower design. In particular, the simulator accepts input data regarding: (a) cooling tower site environmental characteristics; (b) cooling tower operational characteristics; and (c) geometric characteristics of the packing used to increase the surface area within the cooling tower upon which the heat and mass transfer interactions occur. In providing such performance predictions, the simulator performs computations related to the physics of heat and mass transfer within the packing. Thus, instead of relying solely on trial and error wherein various packing geometries are tested during construction of the cooling tower, the packing geometries for a proposed cooling tower can be simulated for use in selecting a desired packing geometry for the cooling tower.

44741421, Oct 2, 1984

Mar 2, 1983

6/471392

Desikan Bharathan - Lakewood CO

The United States of America as represented by the United States
Department of Energy - Washington DC

F22B 2700

122 40

A vertical tube flash evaporator for introducing a superheated liquid into a flash evaporation chamber includes a vertical inlet tube with a flared diffuser portion at its upper outlet end. A plurality of annular screens are positioned in axially spaced-apart relation to each other around the periphery of the vertical tube and below the diffuser portion thereof. The screens are preferably curved upward in a cup-shaped configuration. These flash evaporators are shown in an ocean thermal energy conversion unit designed for generating electric power from differential temperature gradients in ocean water. The method of use of the flash evaporators of this invention includes flowing liquid upwardly through the vertical tube into the diffuser where initial expansion and boiling occurs quite violently and explosively. Unvaporized liquid sheets and drops collide with each other to enhance surface renewal and evaporation properties, and liquid flowing over the outlet end of the diffuser falls onto the curved screens for further surface renewal and evaporation.

59252910, Jul 20, 1999

Mar 25, 1997

8/824236

Desikan Bharathan - Lakewood CO
Yves Parent - Golden CO
A. Vahab Hassani - Golden CO

Midwest Research Institute

B01F 304

261 691

A direct contact condenser having a downward vapor flow chamber and an upward vapor flow chamber, wherein each of the vapor flow chambers includes a plurality of cooling liquid supplying pipes and a vapor-liquid contact medium disposed thereunder to facilitate contact and direct heat exchange between the vapor and cooling liquid. The contact medium includes a plurality of sheets arranged to form vertical interleaved channels or passageways for the vapor and cooling liquid streams. The upward vapor flow chamber also includes a second set of cooling liquid supplying pipes disposed beneath the vapor-liquid contact medium which operate intermittently in response to a pressure differential within the upward vapor flow chamber. The condenser further includes separate wells for collecting condensate and cooling liquid from each of the vapor flow chambers. In alternate embodiments, the condenser includes a cross-current flow chamber and an upward flow chamber, a plurality of upward flow chambers, or a single upward flow chamber.