Gang Li

US Patent:

D539882, Apr 3, 2007

Filed:

Sep 28, 2005

Appl. No.:

29/239290

Inventors:

Gang Li - Clemmons NC, US

Assignee:

H-Tech, Inc. - Wilmington DE

International Classification:

2304

US Classification:

D23351

US Patent:

D574938, Aug 12, 2008

Filed:

Apr 26, 2007

Appl. No.:

29/286192

Inventors:

David Martin - Concord NC, US
Gang Li - Manitowoc WI, US
David L. Schardt - Franklin TN, US

Assignee:

Hayward Industries, Inc. - Elizabeth NJ

International Classification:

2303

US Classification:

D23323

US Patent:

20070137228, Jun 21, 2007

Filed:

Sep 27, 2006

Appl. No.:

11/528493

Inventors:

Gang Li - Clemmons NC, US

International Classification:

F25B 41/00
F25B 1/00

US Classification:

062196400, 062498000

Abstract:

A heat pump system includes a hot gas bypass defrost mechanism which enables normal heat pump operation at low ambient air temperatures, and may be used for heating swimming pools. The bypass defrost mechanism is activated by sensing a drop in compressor suction line pressure, which occurs at low ambient temperatures when frost forms on an evaporator in the heat pump, which disrupts normal heat pump operation. The defrost mechanism includes a circuit that redirects a portion of hot refrigerant discharged by a compressor directly to the evaporator, thereby bypassing other heat pump components and defrosting the evaporator.

US Patent:

20080223561, Sep 18, 2008

Filed:

Jan 22, 2008

Appl. No.:

12/017659

Inventors:

Gang Li - Manitowoc WI, US
Ronald H. Griffin - Boonville NC, US
Carl Bennett Davidson - Mocksville NC, US
Vance Elliot Willis - Nashville TN, US
Vitaly Shinkarev - Greensboro NC, US
David Martin - Concord NC, US
Michael Damion Mercer - Nashville TN, US
David L. Schardt - Franklin TN, US

Assignee:

Hayward Industries, Inc. - Eliazbeth NJ

International Classification:

F28D 7/02

US Classification:

165156

Abstract:

In a first aspect of the present invention, a header for a heat exchanger is disclosed that has an inflow side, an outflow side, a bypass port therebetween, and a pressure-sensitive flapper valve proximal the bypass port. As pressure increases at the inflow side of the header, the flapper valve opens proportionally, and, as pressure decreases at the inflow side, the flapper valve closes proportionally. In a second aspect of the present invention, a tube-in-tube heat exchanger is disclosed that includes a helical tube-in-tube assembly adapted for flow therethrough of a plurality of fluids for heat transfer therebetween. In a third aspect of the present invention, a heat system is provided to include an embodiment of the header and an embodiment of the tube-in-tube heat exchanger, so as to provide a bypass of the tube-in-tube heat exchanger under a pressure condition.

US Patent:

20080264617, Oct 30, 2008

Filed:

Apr 26, 2007

Appl. No.:

11/789870

Inventors:

David Martin - Concord NC, US
Gang Li - Clemmons NC, US
David L. Schardt - Brentwood TN, US
Ronald H. Griffin - Boonville NC, US

International Classification:

F28D 7/10

US Classification:

165154, 622386

Abstract:

Disclosed herein is a heat exchanger for altering the temperature of water from a fluid circulation line of a recreational body of water. The heat exchanger includes a helical tube-in-tube assembly adapted for flow therethrough of a plurality of fluids for heat transfer therebetween, and the heat exchanger further includes a tank defining a chamber in which said helical tube-in-tube assembly is positioned. In an exemplary embodiment, the chamber is an annular chamber, and the tank includes a cylindrical wall defining an external cavity extending through said tank.