Walter John Pohl

US Patent:

41241258, Nov 7, 1978

Filed:

Aug 18, 1977

Appl. No.:

5/825611

Inventors:

Walter J. Pohl - Anchorage KY

Assignee:

General Electric Company - Louisville KY

International Classification:

B23Q 550

US Classification:

214 1BB

Abstract:

An advancing system for heat exchangers having a helically wound spine fin material on the outer wall of a base tube member. The advancing system includes a member movable between a resetting and advancing stroke. The member has a passageway that is adapted to receive the spine fin heat exchanger. The internal walls of the passageway being designed and dimensioned to cause the spine fin tubing to move during the advancing stroke while allowing the tube to remain stationary during the resetting stroke.

US Patent:

41843428, Jan 22, 1980

Filed:

Apr 20, 1979

Appl. No.:

6/031794

Inventors:

Walter J. Pohl - Louisville KY

Assignee:

General Electric Company - Louisville KY

International Classification:

F25B 4106

US Classification:

62511

Abstract:

The present invention provides a restrictor for use in a refrigeration system including the method of adapting its use to the system and more particularly to a restrictor that is formed by providing a flattened portion of tubing that is bent to establish a substantially U-shaped restrictor having diverging leg members connected at their apex by an arcuate segment. Means are provided for moving at least one of the leg members relative to the other so that the diameter of the arcuate segment is altered. Altering the diameter of the arcuate segment causes the cross-sectional area of the restrictor passageway in the segment area to change and, accordingly, the refrigerant flow through the restrictor is effectively adjusted to optimize the refrigeration system efficiency.

US Patent:

45341796, Aug 13, 1985

Filed:

Oct 4, 1984

Appl. No.:

6/657612

Inventors:

George E. Stocking - Louisville KY
Walter J. Pohl - Louisville KY

Assignee:

General Electric Company - Louisville KY

International Classification:

F25D 2102

US Classification:

62128

Abstract:

In a self-contained air conditioner unit of the reversible refrigeration type having cooling and heating cycles, a no-drain heat pump is provided wherein in the heating cycle, water collected on the outdoor heat exchanger operating as the system evaporator is transferred to the indoor section. The condensate is directed into the indoor air flow where it is atomized and directed through the relatively warm indoor heat exchanger operating as a condenser to humidify the air. Control means are provided which produces a signal in the event the condensate when present is not being transferred to the indoor section during the heating cycle.

US Patent:

42008298, Apr 29, 1980

Filed:

Jul 12, 1978

Appl. No.:

5/924104

Inventors:

Walter J. Pohl - Anchorage KY

Assignee:

General Electric Company - Louisville KY

International Classification:

H02P 144

US Classification:

318782

Abstract:

A circuit for protecting single phase induction motors of the type having a start winding connected in series with a start/run capacitor. The circuit contains a resistance bridge wherein the motor start winding forms one leg thereof. A d. c. signal is applied to the input terminals of the bridge. A filter is connected to the output terminals of the bridge so that a relatively ripple free d. c. output signal from the bridge can be applied to the positive input terminal of a d. c. comparator, the negative terminal of which is connected to d. c. reference ground. A reference resistor in a leg of the bridge adjacent the start winding is selected so that the bridge is unbalanced to present a positive d. c. signal to a terminal of the comparator so long as the resistance value of the start winding is less than the value of the reference resistor. An excessive temperature increase of the start winding raises its resistance to equal that of the reference resistor to cause the bridge to balance when the temperature of the start winding reaches a predetermined maximum value, whereupon the comparator switches from a conductive to a non-conductive state.

US Patent:

42155541, Aug 5, 1980

Filed:

May 30, 1978

Appl. No.:

5/910816

Inventors:

Walter J. Pohl - Louisville KY

Assignee:

General Electric Company - Louisville KY

International Classification:

F25D 2106
F25B 4100

US Classification:

62156

Abstract:

Frost control apparatus is disclosed for a temperature conditioning system such as a heat pump or the like, wherein a compressor circulates a volatile fluid through the closed system. Frost-buildup on the indoor and outdoor coils of the system is controlled by means of respective defrost cycles which occur in accordance with the conditions sensed by temperature sensing elements positioned at various points in the system. The defrost cycle for the indoor coil is maintained throughout a predetermined temperature range of ambient indoor air. The defrost cycle for the outdoor coil is initiated as a function of the differential between the temperature of the outdoor coil and that of ambient outdoor air and it varies in magnitude as a function of ambient outdoor air temperature. The termination of the outdoor coil defrost cycle is determined by a sensed temperature condition.

US Patent:

41964624, Apr 1, 1980

Filed:

May 30, 1978

Appl. No.:

5/910303

Inventors:

Walter J. Pohl - Anchorage KY

Assignee:

General Electric Company - Louisville KY

International Classification:

H02H 709

US Classification:

361 33

Abstract:

A solid state electronic circuit for protecting a single phase induction motor against excessive loading by comparing motor start winding voltage with motor source voltage is disclosed, wherein the circuit automatically removes the motor from its driving source upon the occurrence of such excessive loading. An additional feature includes comparing start winding voltage with source voltage to remove the motor from its driving source upon the occurrence of excessive start winding voltage and corresponding excessive high motor speed. A motor starting circuit to permit the start winding voltage to rise to its normal running level and a time delay restarting circuit to permit the motor to automatically restart after elapse of a selected lock out period following removal of the motor from the source due to insufficient or excessive loading is also provided.

US Patent:

46621849, May 5, 1987

Filed:

Jan 6, 1986

Appl. No.:

6/816448

Inventors:

Walter J. Pohl - Louisville KY
William J. McCarty - Louisville KY
Frederick E. Hicks - Portsmouth VA

Assignee:

General Electric Company - Louisville KY

International Classification:

F25D 2106

US Classification:

62156

Abstract:

Disclosed are apparatus and methods for controlling the defrosting of the outdoor heat exchange coil of a heat pump. In general, the disclosed apparatus and methods use the differencee between the outdoor heat exchanger and the outdoor ambient temperature to determine when to initiate a defrosting operation. Only a single sensor is employed, this single sensor being positioned at least proximate the outdoor heat exchanger such that the sensor responds to ambient temperature when the heat pump is first started and the heat exchanger is free of frost, and such that the sensnor becomes surrounded with frost as frost builds up on the heat exchanger during operation. At the beginning of a run the sensor is employed to read the ambient temperature, which is memorized. As frost builds, the sensor begins to reflect the temperature of the heat exchanger as the sensor becomes increasingly insulated by the frost from the surrounding air. During operation thereafter, the sensor is periodically read, the difference between the prevailing sensor temperature and the stored reference is determined and compared to an established difference reference, and a defrosting operation is initiated if the comparison difference exceeds the difference reference.

US Patent:

46532854, Mar 31, 1987

Filed:

Sep 20, 1985

Appl. No.:

6/778076

Inventors:

Walter J. Pohl - Louisville KY

Assignee:

General Electric Company - Louisville KY

International Classification:

F25B 4900
H02H 700

US Classification:

62126

Abstract:

Disclosed are refrigeration system control systems and methods for compressor motor protection and defrost control. The disclosed systems and methods are generic in the sense that they are self-calibrating and so may be employed in a variety of different air conditioner or heat pump models of different sizes and capacities, without being specifically tailored for a particular model. The disclosed systems and methods sense loading on the compressor and evaporator fan motors, preferably by sensing the voltage across the capacitor-run winding of an AC induction motor and normalizing with respect to line voltage. The self-calibrating capability is implemented by taking advantage of the changing loads as a function of time on both the compressor and fan motors during both normal and abnormal operation of a refrigeration system. In overview, a reference value of motor loading is established for each motor at certain times during an ON cycle. At later times the then-prevailing motor loading is compared to the stored reference in order to provide a basis for control decisions.