Kendro Laboratory Products Gmbh

Gsle Development Corporation

Spx Corporation

Thermo Fisher Scientific (asheville) LLC

Gsle Development Corporation (de Corp)

Chuan Weng

Allan Douglas Kelly

Richard H Bair, Iii

James D Nye

Brian Darling

A pressure equalization port for a refrigeration unit is provided. The port includes a conduit having a thermally conductive body. The conduit includes a first opening exposed to a refrigeration chamber enclosed within the refrigeration unit, and a second opening exposed to a space external to the refrigeration chamber. At least one heat-dissipating refrigerant flow coil surrounds a portion of the thermally conductive body to heat said body.

Pressure equalization port apparatus and method for a refrigeration unit

A method and apparatus which provides a pressure sensor and/or temperature sensor connected to the low pressure side of a refrigeration system, or the discharge line of a scroll compressor. When the scroll compressor rotates backward, the change of pressure or temperature immediately sends a signal to work with a time-delay relay and a normally closed relay to immediately cut off the electrical power supply to the compressor. Thus, causing the scroll compressor to stop rotating in the undesirable direction.

Device for prevention of backward operation of scroll compressors

A cooling circuit through which coolant flows, for use with a refrigerated cabinet. The cooling circuit includes a compressor and a condenser with a flow path extending there between. The cooling circuit also includes an evaporator and a second flow path that extends between the evaporator and the condenser. The cooling circuit additionally includes a suction accumulator and a flow path extending between the evaporator and the suction accumulator, while a fourth flow path extends between the suction accumulator and the compressor. The cooling circuit also includes a coolant bypass and a switch that switches the cooling circuit between a cycling mode and a non-cycling mode.

Cooling circuit apparatus and method

A temperature control device including a temperature sensor which senses a temperature at a specified location within the refrigeration apparatus. The temperature control device has first flow valve that is operable to selectively increase or decrease the flow of refrigerant in response to the temperature sensed by the sensor. In addition, the device has a second flow valve that is operable to selectively increase or decrease hot gas flow in response to the temperature sensed by the sensor. The temperature control device also contains a controller which controls the above mentioned valves in response to the temperature sensed by the temperature sensor.

Method and apparatus for temperature control in a refrigeration device

Methods and apparatus for a two chamber freezer whereby both chambers can be maintained at a substantially constant ultra-low temperature, such as within the range of about &minus;40&deg; C. to &minus;80&deg; C. Short term items may be stored in and accessed by the upper door from an upper chamber while long term items may be stored in and accessed by the lower door in the lower chamber. The upper and lower chambers are thermodynamically independent of each other thereby reducing the power usage of the freezer.

Dual independent chamber ultra-low temperature freezer

Methods and apparatus for a refrigeration heat exchanger section useful in circulating a substantially non-HCFC refrigerant mixture which comprises: a compressor means, an auxiliary condenser, a first condenser, a second condenser, a third condenser, a subcooler and a liquid/gas separator, wherein a subcooled refrigerant liquid mixture taken as bottoms from the liquid/gas separator is distributed and expanded by a first expansion means and a second expansion means to form first and second expanded streams, respectively, such that the first expanded stream is returned to the auxiliary condenser and compressor in order to avoid overheating of the compressor.

Non-HCFC refrigerant mixture for an ultra-low temperature refrigeration system

Methods and apparatus for freezer defrost, which are particularly suited for an automated system, include the formulation of algorithms utilized for this purpose. The algorithms are included in the firmware of an embedded controller and operate the freezer defrost cycle at temperature lows for increased efficiency. An application of the freezer defrost method and apparatus is also disclosed.

Freezer defrost method and apparatus

Methods and apparatus for non-hydrocarbon design of ultra-low temperature refrigeration systems, which are particularly suited a non-hydrocarbon ultra-low temperature refrigeration system that can safely be transported and applied in the field as needed without the risks associated with hydrocarbon ultra-low temperature refrigeration system are disclosed. An application of the non-hydrocarbon design of ultra-low temperature refrigeration system method and apparatus to freezers and the like is also disclosed.

Non-hydrocarbon ultra-low temperature system for a refrigeration system

A refrigeration system having a flow control mechanism to selectively increase or decrease refrigerant flow in response to system temperature. In the preferred embodiment, a cascade refrigeration system having a high temperature first stage with a compressor, condenser, flow control device and heat exchanger. The low temperature second stage has a compressor, flow control device, evaporator and heat exchanger. The first stage is in a heat exchange relationship with the second stage through the common heat exchanger, which functions as condenser in the second stage. A controller responsive to temperature sensed at the second stage evaporator outlet operates a valve to increase or decrease refrigerant flow in the first stage. Increased refrigerant flow improves refrigeration system response to large heat loads, while maintaining efficient operation under normal conditions.

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Weaverville, NC, United States of America

Chuan Weng