David T Harrje

US Patent:

51638215, Nov 17, 1992

Filed:

Apr 2, 1991

Appl. No.:

7/678640

Inventors:

Quentin T. Kelly - Hopewell NJ
Steve M. Slaby - Princeton NJ
David T. Harrje - Coupeville WA
Tony J. Poli - Hamilton Square NJ
Stefan C. Slaby - New Hope PA
D. Michael H. Platt - Corning NY
John H. Fernandes - Tiverton RI

Assignee:

WorldWater, Inc. - Hopewell NJ

International Classification:

F04B 1700
F24J 302

US Classification:

417379

Abstract:

A solar powered water pump combines an evacuated tubular solar collector array for heating air with a diaphragm type pump by providing an internal heat exchanger in the manifold of the collector array. The heat exchanger uses heat from the heated air to generate steam from water. The steam from the heat exchanger is used to drive the diaphragm pump. Another heat exchange medium such as freon or ammonia can be used in place of water.

US Patent:

45677735, Feb 4, 1986

Filed:

Jan 5, 1984

Appl. No.:

6/568394

Inventors:

Jack B. Cooper - Princeton NJ
David T. Harrje - Princeton NJ

Assignee:

Energy Utilization Laboratories, Inc. - Baltimore MD

International Classification:

G01L 1904

US Classification:

73708

Abstract:

A pressure transducer system including a pressure transducer, a heater and a temperature sensor and controller for controlling the heater. A thermal lead network is also provided that has a resistor that is physically located in close proximity to the temperature sensor and thermally bonded so that the heat that this resistor generates reaches the temperature sensor well in advance of the heat that would ultimately reach the temperature sensor from the heater. In view of this arrangement, this pressure transducer system is capable of making precise measurements in a time-varying temperature environment.