Heatcraft Inc.

Heatcraft Refrigeration Products LLC

Lgl France

Ira Zelman Richter

James A Kitchen

Gregory S Derosier

Alain Compingt

Nicole Z Martin

Patrick M Bailey

Shaobo Jia

Mohamed Ali Ben Lakhdhar

Larry L Shanks

Donald Victor McNemar

An apparatus includes a separator tank, a heat exchanger, a compressor-less heat separator, and a fluid cooler. The separator tank separates a first refrigerant into a vapor component and a liquid component. The heat exchanger is exposed to a load. The heat exchanger uses the liquid component of the first refrigerant to remove heat from a space proximate the load. The space includes at least one of a refrigeration unit and walk-in cooler or freezer. The compressor-less heat separator extracts heat from the vapor component of the first refrigerant and uses electrical power to move the heat to a second refrigerant. The fluid cooler removes heat from the second refrigerant.

Compressor-less cooling system

A method for affecting a scheduled defrost operation for a refrigeration system includes the steps of: (a) after an extant the scheduled defrost operation commences, evaluating at least one predetermined parameter relating to operation of the refrigeration system; (b) if the at least one predetermined parameter manifests a behavior of at least one first predetermined nature over at least one first time interval, continuing the extant scheduled defrost operation; and (c) if the at least one predetermined parameter manifests a behavior of at least one second predetermined nature over at least one second time interval, discontinuing the extant scheduled defrost operation.

Method and apparatus for affecting defrost operations for a refrigeration system

The invention concerns a metal fin for heat exchanger with tubes, comprising means for increasing heat transfers consisting of diverting conformations () each arranged upstream and downstream of an aperture () when considering the direction (F) of air flow, to force the air to pass either side of said aperture, the upstream () and downstream () diverting conformations of two superimposed apertures () belonging to one same column extending along a determined length so that they substantially rejoin at the plane of extension (P) of offset apertures. (Figure to be published: FIG.).

Metal fin for air heat exchanger

An improved defrost controller is provided for a space cooling system of the type having an evaporator in heat exchange relationship with a space to be cooled, a condenser external to the space, a compressor for circulating heat transfer fluid between the evaporator and condenser, an expansion valve located between an outlet from the condenser and an inlet to the evaporator, and a defroster operatively associated with the evaporator. The expansion valve is positionable in a plurality of positions between a fully open position and a fully closed position to maintain a desired level of superheat across the evaporator. The defrost controller monitors the expansion valve position and activates the defroster in response to the expansion valve being in a more closed position than a predetermined defrost target position. The defrost controller is further operable to prevent defrosting from occurring at times other than predetermined allowed defrost times, even if the position of the expansion valve indicates a demand for defrost. The defrost target position is adjusted in response to changes in selected system operating parameters. Further, at each allowed defrost time, the controller determines whether defrosting can be deferred until a next allowed defrost time, based on the then current rate of degradation in evaporator performance. If the then current rate of degradation indicates that defrosting cannot be deferred to the next allowed defrost time, the controller activates the defroster, even if a demand for defrost is not indicated.

Defrost control for space cooling system

A heat exchanger fin having enhanced corrugations is provided. The corrugations define a generally sinusoidal wave pattern in a transverse direction across the fin. The fin is particularly well-suited for use in a heat exchanger, such as an evaporator or condenser, in a refrigeration system where the spacing between adjacent fins tends to be greater than in an air conditioning system. For example, when the spacing between adjacent fins is in a range from about 2 to 8 fins per inch, the height of the corrugations is greater than the fin spacing. The greater corrugation height bends the air passing between adjacent fins to a greater extent than prior art corrugated fins, thereby causing a greater volume of air to follow the contours of the corrugations and to come into contact with the surfaces of the fins to enhance heat transfer between the air and the fins. Further, the airflow upstream of the fin collars is defined by a larger vortices than in prior art corrugated fins, which further improves heat transfer. Further, this improved heat transfer is achieved without any appreciable air side pressure loss.

Growing community of inventors

Lilburn, GA, United States of America

Ira Zelman Richter