Keith Michael Gawlik

6378605, Apr 30, 2002

Dec 2, 1999

09/453386

Charles F. Kutscher - Golden CO
Keith Gawlik - Boulder CO

Midwest Research Institute - Kansas City MO

F28F 124

165181, 165907

The heat exchanger includes a fin and tube assembly with increased heat transfer surface area positioned within a hollow chamber of a housing to provide effective heat transfer between a gas flowing within the hollow chamber and a fluid flowing in the fin and tube assembly. A fan is included to force a gas, such as air, to flow through the hollow chamber and through the fin and tube assembly. The fin and tube assembly comprises fluid conduits to direct the fluid through the heat exchanger, to prevent mixing with the gas, and to provide a heat transfer surface or pathway between the fluid and the gas. A heat transfer element is provided in the fin and tube assembly to provide extended heat transfer surfaces for the fluid conduits. The heat transfer element is corrugated to form fins between alternating ridges and grooves that define flow channels for directing the gas flow. The fins are fabricated from a thin, heat conductive material containing numerous orifices or pores for transpiring the gas out of the flow channel.

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.

48786144, Nov 7, 1989

Aug 3, 1988

7/227707

Clifford C. Hach - Loveland CO
Keith M. Gawlik - Loveland CO

Hach Company - Loveland CO

A01C 2304
A01G 2509

239 10

A system for programming and controlling the rate at which an agricultural chemical (e. g. fertilizer) is supplied to the water in an agricultural irrigation system. In one embodiment the system is combined with a center pivot irrigation system having a vertical water feed pipe, a horizontal boom, and a chemical supply connected to the feed pipe. A rotation sensor determines the degree of rotation of the boom and a controller controls the amount of chemical supplied to the feed pipe. The system enables the amount of chemical applied to be varied from one section of a field to another.

49936344, Feb 19, 1991

Oct 24, 1989

7/426055

Clifford C. Hach - Loveland CO
Keith M. Gawlik - Loveland CO

Hach Company - Loveland CO

A01C 2304
A01G 2509

239 10

A system for programming and controlling the rate at which an agricultural chemcial (e. g. , fertilizer) is supplied to the water in an agricultural irrigation system. In one embodiment the system is combined with a center pivot irrigation system having a vertical water feed pipe, a horizontal boom, and a chemical supply connected to the feed pipe. A rotation sensor determines the degree of rotation of the boom and a controller controls the amount of chemical supplied to the feed pipe. The system enables the amount of chemical applied to be varied from one section of a field to another.

56924917, Dec 2, 1997

Apr 19, 1996

8/639852

Craig B. Christensen - Boulder CO
Charles F. Kutscher - Golden CO
Keith M. Gawlik - Boulder CO

Midwest Research Institute - Kansas City MO

E04D 1318
F24J 248

126628

An unglazed transpired solar collector using solar radiation to heat incoming air for distribution, comprising an unglazed absorber formed of low thermal-conductance material having a front surface for receiving the solar radiation and openings in the unglazed absorber for passage of the incoming air such that the incoming air is heated as it passes towards the front surface of the absorber and the heated air passes through the openings in the absorber for distribution.