Young Ae Cho

US Patent:

6389818, May 21, 2002

Filed:

Jan 12, 2001

Appl. No.:

09/760232

Inventors:

Young I. Cho - Cherry Hill NJ
Cheolho Bai - Taegu, KR

Assignee:

Vortex Aircon, Inc. - Cherry Hill NJ

International Classification:

F25B 902

US Classification:

62 5, 62498

Abstract:

A refrigeration system utilizing a vortex generator and a diffuser to reduce the pressure differential between the head pressure and suction pressure across a compressor.

US Patent:

6412336, Jul 2, 2002

Filed:

Jul 2, 2001

Appl. No.:

09/897176

Inventors:

Sehyun Shin - Bryn Mawr PA
Young Cho - Cherry Hill NJ
Kenneth Kensey - Malvern PA
William N. Hogenauer - Gilbertsville PA
Sangho Kim - Philadelphia PA

Assignee:

Rheologics, Inc. - Exton PA

International Classification:

G01N 1106

US Classification:

73 5407, 600573

Abstract:

An apparatus and method for determining the viscosity of the circulating blood of a living being over plural shear rates caused by a decreasing pressure differential by monitoring the changing weight of the blood, or the changing level of a column of blood over time. The apparatus and method utilize a riser, a capillary tube, a collector and a mass detector, such as a precision balance or a load cell, for monitoring the changing weight of a sample of fluid that flows through these components under the influence of the decreasing pressure differential; alternatively, the apparatus and method use a column level detector to monitor the changing level of the column of blood over time.

US Patent:

6425249, Jul 30, 2002

Filed:

Mar 24, 2000

Appl. No.:

09/535126

Inventors:

Young I. Cho - Cherry Hill NJ
Cheolho Bai - Taegu, KR

Assignee:

VAI Holdings, LLC - Cherry Hill NJ

International Classification:

F25B 902

US Classification:

62 5, 623246, 62498

Abstract:

An improved refrigeration system utilizing one or more vortex tubes. Vortex tubes produce liquid refrigerant from saturated-state vapor refrigerant in a vapor-compression refrigeration cycle. The efficiency of a refrigeration system can be improved by placing vortex tubes before and after the evaporator.

US Patent:

6430937, Aug 13, 2002

Filed:

Mar 8, 2001

Appl. No.:

09/802763

Inventors:

Young I. Cho - Cherry Hill NJ
Cheolho Bai - Taegu, KR

Assignee:

VAI Holdings, LLC - Cherry Hill NJ

International Classification:

F25B 902

US Classification:

62 5, 62498

Abstract:

The performance of a refrigeration system is often reduced due to insufficient refrigerant charge or due to the use of an inverter compressor. The performance loss is associated with the operating condition, which is not at the optimum, thus yielding less than the maximum EER (energy efficiency ratio). A vortex generator restores the optimum operating condition in the refrigeration system with insufficient refrigerant charge or using an inverter compressor.

US Patent:

6449964, Sep 17, 2002

Filed:

Sep 18, 2001

Appl. No.:

09/954613

Inventors:

Young I. Cho - Cherry Hill NJ
Cheolho Bai - Taegu, KR

Assignee:

Vortex Aircon - Cherry Hill NJ

International Classification:

F25B 100

US Classification:

62114, 62501

Abstract:

A regenerative type of refrigeration system recirculates a mixture of R-134a, R-32 and R-125 through first and second series condensers. In order to increase the concentration of the high-boiling point R-134a, the liquid output of a liquid-vapor separator receives a super-heated mixture vapor tapped from the output of the compressor. An adjustable valve controls the amount of the super heated mixture vapor which is injected to vary the concentration of R-134a in the recirculation line. Liquified R-134a passes through a secondary expansion valve and a secondary evaporator, reducing to an intermediate pressure, and enters a vortex tube, thus bypassing the main evaporator. Subsequently, the suction pressure of the compressor increases, increasing the EER of the refrigeration system. The recirculating concept is also applicable to a single refrigerant system.

US Patent:

6450974, Sep 17, 2002

Filed:

Nov 8, 2000

Appl. No.:

09/708137

Inventors:

Sangho Kim - Philadelphia PA
Sehyun Shin - Bryn Mawr PA
Young I. Cho - Cherry Hill NJ

Assignee:

Rheologics, Inc. - Exton PA

International Classification:

A61B 500

US Classification:

600573, 73 6448

Abstract:

A method for isolating the effects of surface tension and/or yield stress of a fluid that is flowing in a U-shaped tube wherein one or both legs of the U-shaped tube is monitored over time for the changing height of the respective fluid columns therein. A portion of the U-shaped tube comprises a flow restrictor, e. g. , a capillary tube, of known dimensions. Monitoring one or both of the moving fluid columns over time permits the determination of the viscosity of the fluid flowing therein over a range of shear rates from the difference in fluid column heights. However, it is necessary to isolate the effects of surface tension and/or yield stress to obtain an accurate viscosity determination. The method provides one manner in which the surface tension effect can be subtracted from the difference in fluid column heights and then any yield stress effect can then be determined. Alternatively, the method also provides a process by which both the surface tension effect and yield stress effect can be determined simultaneously.

US Patent:

6484565, Nov 26, 2002

Filed:

Jul 2, 2001

Appl. No.:

09/897164

Inventors:

Sehyun Shin - Bryn Mawr PA
Young Cho - Cherry Hill NJ
Kenneth Kensey - Malvern PA
William N. Hogenauer - Gilbertsville PA
Sangho Kim - Philadelphia PA

Assignee:

Drexel University - Philadelphia PA

International Classification:

G01N 1100

US Classification:

73 5401, 73 5404

Abstract:

An apparatus and method for determining the viscosity of a fluid over plural shear rates caused by a decreasing pressure differential by monitoring the movement of the fluid through a riser tube and a capillary tube. The movement can be monitored by detecting the changing weight of the fluid, using a precision balance or load cell, as it moves through the riser tube and capillary tube into a fluid collector; or, alternatively, the movement can be monitored by detecting the changing level of a fluid column in the riser tube using a column level detector. A processor then uses the changing weight or height data, along with the dimensions of the capillary tube and a dimension of the riser tube, to determine the viscosity of the fluid. In addition, apparatus and methods for determining fluid viscosity online and fluid mixture homogeneity online are also described.

US Patent:

6484566, Nov 26, 2002

Filed:

Nov 27, 2000

Appl. No.:

09/722954

Inventors:

Seyhun Shin - Bryn Mawr PA
Young Cho - Cherry Hill NJ
Kenneth Kensey - Malvern PA
William N. Hogenauer - Gilbertsville PA

Assignee:

Rheologics, Inc. - Exton PA

International Classification:

G01N 1143

US Classification:

73 5407, 324 711, 73 5401, 73 5414

Abstract:

A scanning rheometer is presented for the rheological property measurement of electrorheological (ER) and magnetorheological (MR) fluids using a non-linear viscoplastic model, based on the fluid height variation with respect to time. The rheometer basically includes a static (e. g. , an overhead reservoir) or a dynamic source of fluid, a channel or slit whose sides form electrodes which are in contact with the flowing ER fluid, or a capillary tube exposed to a static/alternating magnetic field for flowing MR fluids, a transfer tube, either one or two riser tubes, and a column level detector for monitoring the column of fluid as it moves in one of the riser tubes. The column level detector is coupled to a processor which analyzes, among other things, column height vs. time data to determine both viscosity and yield stress. The rheometer overcomes one of the major drawbacks of the conventional rheometer: the inability to produce the yield stress of the ER, or MR, fluid in an absolute zero shear rate range.