David A Dukes

US Patent:

7788940, Sep 7, 2010

Filed:

Jul 20, 2006

Appl. No.:

11/458732

Inventors:

Steven M. Madara - Columbus OH, US
Steve Sillato - Westerville OH, US
Thomas E. Harvey - Columbus OH, US
David A. Dukes - Powell OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

F25D 23/12
F25D 17/00
H05K 5/00
H05K 7/20

US Classification:

622592, 454184, 361695, 361688, 62333

Abstract:

The disclosure provides an improved cooling system and associated cabinet for electronic equipment, and optionally, a backup ventilation system for cooling related failures. Generally, the disclosure includes a high capacity closed loop refrigeration system in a modified cabinet, while accommodating standard sized computer equipment. Further, the system provides directed heat removal by altering typical airflow paths within the cabinet. The backup ventilation system is powered by auxiliary power in the case of power failure and uses the same fan(s) for ventilation as is used for cooling. The disclosure provides a more efficient, higher capacity cooling cabinet in less space than otherwise known in the art. Further, the cooling system can anticipate heat loads and therefore operate in a predictive capacity by monitoring input power to the electronic equipment and adjusting the cooling for the expected increase or decrease in heat load generated based on the input power.

US Patent:

7886983, Feb 15, 2011

Filed:

Jul 10, 2007

Appl. No.:

11/775604

Inventors:

Karl M. Criss - Columbus OH, US
David A. Dukes - Columbus OH, US
Thomas E. Harvey - Columbus OH, US

Assignee:

Liebert Corporation - Columbus OH

International Classification:

F24F 3/14

US Classification:

236 44C, 236 94, 62125, 165231

Abstract:

A method of preventing condensation on equipment inside a temperature-controlled enclosure comprises measuring the temperature in at least one location inside the enclosure. The temperature inside the enclosure is compared with a safe temperature, at which the risk of condensation is reduced. The temperature inside the enclosure is increased until the safe temperature is achieved. A user is then notified that it is safe to access the enclosure.

US Patent:

20110101118, May 5, 2011

Filed:

Jan 6, 2011

Appl. No.:

12/986035

Inventors:

Karl M. CRISS - Columbus OH, US
David A. DUKES - Columbus OH, US
Thomas E. HARVEY - Columbus OH, US

Assignee:

LIEBERT CORPORATION - Columbus OH

International Classification:

F24F 11/02
F24F 3/14

US Classification:

236 44 C

Abstract:

A method of preventing condensation on equipment inside a temperature-controlled enclosure comprises measuring the temperature in at least one location inside the enclosure. The temperature inside the enclosure is compared with a safe temperature, at which the risk of condensation is reduced. The temperature inside the enclosure is increased until the safe temperature is achieved. A user is then notified that it is safe to access the enclosure.

US Patent:

57091005, Jan 20, 1998

Filed:

Aug 29, 1996

Appl. No.:

8/705430

Inventors:

Daniel B. Baer - Delaware OH
Frank E. DiPaolo - Dublin OH
Stephen C. Sillato - Westerville OH
David A. Dukes - Powell OH

Assignee:

Liebert Corporation - Columbus OH

International Classification:

F25D 2312

US Classification:

622592

Abstract:

A redundant, dual circuit air conditioning apparatus is provided for communications enclosures which is wall mounted thereon. A conditioned air housing is provided having a blower chamber which contains two air circulation blowers thrusting air into the enclosure and having freely pivotal ducts which operate in mutual cooperation in response to pressure variations between the chamber and the enclosure. Internested evaporator coils of two discrete refrigeration circuits share common fin connections for efficiency and each includes a dual line input performing in conjunction with an expansion valve and a simple Y distribution fitting coupled to those lines which achieves requisite pressure drops at low cost. Compressor and condenser components are located within a condenser system housing in mutual isolation and perform in conjunction with discrete separate power inputs and controls such that servicing may take place safely upon one air conditioning entity while the other remains in operation to prevent down time during servicing.