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Proceedings Papers

A Control Strategy for Minimizing Temperature Fluctuations in High Power Liquid to Liquid CDUs Operated at Very Low Heat Loads

Ali Heydari, Pardeep Shahi, Vahideh Radmard, Bahareh Eslami, Uschas Chowdhury, Chandraprakash Hinge, Lochan Sai Reddy Cinthaparthy, Harold Miyamura, Himanshu Modi, Dereje Agonafer, Jeremy Rodriguez
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A011, October 25–27, 2022
Paper No: IPACK2022-97434
https://doi.org/10.1115/IPACK2022-97434
View Paper titled, A Control Strategy for Minimizing Temperature Fluctuations in High Power Liquid to Liquid CDUs Operated at Very Low Heat Loads
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Topics: Coolants, Cooling, Data centers, Fluctuations (Physics), Heat, Plates (structures), Stress, Temperature, Failure, Flow control
Proceedings Papers

Determination of the Thermal Performance Limits for Single Phase Liquid Cooling Using an Improved Effectiveness-NTU Cold Plate Model

Alfonso Ortega, Carol Caceres, Umut Uras, Deogratius Kisitu, Uschas Chowdhury, Vahideh Radmard, Ali Heydari
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A008, October 25–27, 2022
Paper No: IPACK2022-97421
https://doi.org/10.1115/IPACK2022-97421
View Paper titled, Determination of the Thermal Performance Limits for Single Phase Liquid Cooling Using an Improved Effectiveness-NTU Cold Plate Model
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Topics: Cooling, Plates (structures), Thermal resistance, Flow (Dynamics), Pressure drop, Computational fluid dynamics, Coolants, Cooling systems, Engineering simulation, Fluids
Proceedings Papers

Liquid to Air Cooling for High Heat Density Liquid Cooled Data Centers

Ali Heydari, Vahideh Radmard, Bahareh Eslami, Mohammad I. Tradat, Yaman Manaserh, Harold Miyamura, Uschas Chowdhury, Pardeep Shahi, Kevin Dave Hall, Bahgat Sammakia, Jeremy Rodriguez
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A005, October 25–27, 2022
Paper No: IPACK2022-97386
https://doi.org/10.1115/IPACK2022-97386
View Paper titled, Liquid to Air Cooling for High Heat Density Liquid Cooled Data Centers
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Topics: Cooling, Data centers, Density, Heat, Heat exchangers
Proceedings Papers

Direct-to-Chip Two-Phase Cooling for High Heat Flux Processors

Ali Heydari, Yaman Manaserh, Ahmad Abubakar, Carol Caceres, Harold Miyamura, Alfonso Ortega, Jeremy Rodriguez
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A003, October 25–27, 2022
Paper No: IPACK2022-97047
https://doi.org/10.1115/IPACK2022-97047
View Paper titled, Direct-to-Chip Two-Phase Cooling for High Heat Flux Processors
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Topics: Cooling, Heat flux
Proceedings Papers

Experimental Study of Transient Hydraulic Characteristics for Liquid Cooled Data Center Deployment

Ali Heydari, Pardeep Shahi, Vahideh Radmard, Bahareh Eslami, Uschas Chowdhury, Akiilessh Sivakumar, Akshay Lakshminarayana, Harold Miyamura, Gautam Gupta, Dereje Agonafer, Jeremy Rodriguez
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A009, October 25–27, 2022
Paper No: IPACK2022-97425
https://doi.org/10.1115/IPACK2022-97425
View Paper titled, Experimental Study of Transient Hydraulic Characteristics for Liquid Cooled Data Center Deployment
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Topics: Cooling, Data centers, Flow control, Plates (structures), Transients (Dynamics)
Proceedings Papers

Liquid to Liquid Cooling for High Heat Density Liquid Cooled Data Centers

Ali Heydari, Pardeep Shahi, Vahideh Radmard, Bahareh Eslami, Uschas Chowdhury, Satyam Saini, Pratik Bansode, Harold Miyamura, Dereje Agonafer, Jeremy Rodriguez
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A007, October 25–27, 2022
Paper No: IPACK2022-97416
https://doi.org/10.1115/IPACK2022-97416
View Paper titled, Liquid to Liquid Cooling for High Heat Density Liquid Cooled Data Centers
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Topics: Cooling, Data centers, Density, Heat, Plates (structures), Coolants, Cooling systems, Flow (Dynamics), Modeling, Server racks
Proceedings Papers

Power Usage Effectiveness Analysis of a High-Density Air-Liquid Hybrid Cooled Data Center

Ali Heydari, Bahareh Eslami, Vahideh Radmard, Fred Rebarber, Tyler Buell, Kevin Gray, Sam Sather, Jeremy Rodriguez
Proc. ASME. InterPACK2022, ASME 2022 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T01A014, October 25–27, 2022
Paper No: IPACK2022-97447
https://doi.org/10.1115/IPACK2022-97447
View Paper titled, Power Usage Effectiveness Analysis of a High-Density Air-Liquid Hybrid Cooled Data Center
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Topics: Cooling, Data centers, Density, Energy consumption, Temperature, Computational fluid dynamics, Design, Flow (Dynamics), Carbon, Cooling systems
Proceedings Papers

Miniature Vapor Compression Refrigeration Systems for Active Cooling of High Performance Computers

Ali Heydari, Kathy Russell
Proc. ASME. IMECE2001, Packaging, Reliability and Manufacturing Issues Associated With Electronic and Photonic Products, 83-93, November 11–16, 2001
Paper No: IMECE2001/EPP-24710
https://doi.org/10.1115/IMECE2001/EPP-24710
View Paper titled, Miniature Vapor Compression Refrigeration Systems for Active Cooling of High Performance Computers
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Topics: Compression, Computers, Cooling, Refrigeration, Vapors, Compressors, Refrigerants, Condensers (steam plant), Heat exchangers, Clearances (Engineering)
Proceedings Papers

Boiling Curve Measurement of Water Containing Dissolved Carbon Dioxide Around a Heated Wire

Ali Heydari, V. P. Carey
Proc. ASME. IMECE2001, Heat Transfer: Volume 1 — Fundamentals of Heat Transfer, 301-306, November 11–16, 2001
Paper No: IMECE2001/HTD-24131
https://doi.org/10.1115/IMECE2001/HTD-24131
View Paper titled, Boiling Curve Measurement of Water Containing Dissolved Carbon Dioxide Around a Heated Wire
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Topics: Boiling, Carbon dioxide, Water, Wire, Metalwork, Cooling, Heat transfer, Metals, Quenching (Metalworking), Carbon
Proceedings Papers

Boundary Layers on a Rotating Rough Disk

Ali Heydari, Ramin Miryan, Saeid Sharifi
Proc. ASME. CIE94, ASME 1994 International Computers in Engineering Conference and Exhibition, 775-778, September 11–14, 1994
Paper No: CIE1994-0470
https://doi.org/10.1115/CIE1994-0470
View Paper titled, Boundary Layers on a Rotating Rough Disk
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Topics: Boundary layers, Disks, Surface roughness, Turbulence, Approximation, Boundary layer turbulence, Circular cylinders, Flat plates, Flow (Dynamics), Fluid dynamics
Proceedings Papers

Mixed Convective Heat Transfer From Rotating Spheres

Ali Heydari, Bahar Firoozabadi, Hamid Fazelli
Proc. ASME. DETC98, Volume 6: 18th Computers in Engineering Conference, V006T06A094, September 13–16, 1998
Paper No: DETC98/CIE-6040
https://doi.org/10.1115/DETC98/CIE-6040
View Paper titled, Mixed Convective Heat Transfer From Rotating Spheres
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Topics: Convection, Boundary layers, Flow (Dynamics), Heat transfer, Approximation, Cooling, Heat transfer coefficients, Heating, Navier-Stokes equations, Shear (Mechanics)
Journal Articles

Computational Fluid Dynamic Prediction and Physical Mechanisms Consideration of Thermal Separation and Heat Transfer Processes Inside Divergent, Straight, and Convergent Ranque–Hilsch Vortex Tubes

Adib Bazgir, Nader Nabhani, Bahamin Bazooyar, Ali Heydari
Journal: Journal of Heat Transfer
Article Type: Research-Article
J. Heat Transfer. October 2019, 141(10): 101701.
Paper No: HT-18-1305
https://doi.org/10.1115/1.4043728
Published Online: September 13, 2019
View Article titled, Computational Fluid Dynamic Prediction and Physical Mechanisms Consideration of Thermal Separation and Heat Transfer Processes Inside Divergent, Straight, and Convergent Ranque–Hilsch Vortex Tubes
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Topics: Flow (Dynamics), Pressure, Separation (Technology), Vortices, Temperature, Heat transfer
Proceedings Papers

Optimal Switching of Voltage Source Inverters Using Approximate Dynamic Programming

Ataollah Gogani Khiabani, Ali Heydari
Proc. ASME. DSCC2018, Volume 1: Advances in Control Design Methods; Advances in Nonlinear Control; Advances in Robotics; Assistive and Rehabilitation Robotics; Automotive Dynamics and Emerging Powertrain Technologies; Automotive Systems; Bio Engineering Applications; Bio-Mechatronics and Physical Human Robot Interaction; Biomedical and Neural Systems; Biomedical and Neural Systems Modeling, Diagnostics, and Healthcare, V001T01A006, September 30–October 3, 2018
Paper No: DSCC2018-8998
https://doi.org/10.1115/DSCC2018-8998
View Paper titled, Optimal Switching of Voltage Source Inverters Using Approximate Dynamic Programming
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Topics: Dynamic programming, Control equipment, Engineering simulation, Feedback, Robustness, Simulation, Stress, Uncertainty
Proceedings Papers

Design Analysis and Performance Evaluation of a Data Center With Indirect Evaporative Cooling

Fatemeh Tavakkoli, Siavash Ebrahimi, Xiaogang Sun, Yan Cui, Ali Heydari
Proc. ASME. InterPACK2017, ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, V001T02A012, August 29–September 1, 2017
Paper No: IPACK2017-74295
https://doi.org/10.1115/IPACK2017-74295
View Paper titled, Design Analysis and Performance Evaluation of a Data Center With Indirect Evaporative Cooling
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Topics: Data centers, Design, Evaporative cooling, Performance evaluation, Cooling, Computational fluid dynamics, Water, Air flow, Air pollution, Cooling systems
Proceedings Papers

Approximate Solution for Optimal Control of Continuous-Time Switched Systems

Tohid Sardarmehni, Ali Heydari
Proc. ASME. DSCC2016, Volume 1: Advances in Control Design Methods, Nonlinear and Optimal Control, Robotics, and Wind Energy Systems; Aerospace Applications; Assistive and Rehabilitation Robotics; Assistive Robotics; Battery and Oil and Gas Systems; Bioengineering Applications; Biomedical and Neural Systems Modeling, Diagnostics and Healthcare; Control and Monitoring of Vibratory Systems; Diagnostics and Detection; Energy Harvesting; Estimation and Identification; Fuel Cells/Energy Storage; Intelligent Transportation, V001T02A004, October 12–14, 2016
Paper No: DSCC2016-9745
https://doi.org/10.1115/DSCC2016-9745
View Paper titled, Approximate Solution for Optimal Control of Continuous-Time Switched Systems
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Topics: Optimal control, Algorithms, Dynamics (Mechanics), Simulation results
Proceedings Papers

Optimal Switching in Anti-Lock Brake Systems of Ground Vehicles Based on Approximate Dynamic Programming

Tohid Sardarmehni, Ali Heydari
Proc. ASME. DSCC2015, Volume 3: Multiagent Network Systems; Natural Gas and Heat Exchangers; Path Planning and Motion Control; Powertrain Systems; Rehab Robotics; Robot Manipulators; Rollover Prevention (AVS); Sensors and Actuators; Time Delay Systems; Tracking Control Systems; Uncertain Systems and Robustness; Unmanned, Ground and Surface Robotics; Vehicle Dynamics Control; Vibration and Control of Smart Structures/Mech Systems; Vibration Issues in Mechanical Systems, V003T50A010, October 28–30, 2015
Paper No: DSCC2015-9893
https://doi.org/10.1115/DSCC2015-9893
View Paper titled, Optimal Switching in Anti-Lock Brake Systems of Ground Vehicles Based on Approximate Dynamic Programming
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Topics: Antilock braking systems, Dynamic programming, Vehicles, Artificial neural networks, Hydraulic brakes, Actuators, Algorithms, Brakes, Braking, Computer simulation
Proceedings Papers

Hot Spot Cooling Using Recycled Energy

Chien Ouyang, Kenny Gross, Ali Heydari
Proc. ASME. InterPACK2007, ASME 2007 InterPACK Conference, Volume 2, 259-263, July 8–12, 2007
Paper No: IPACK2007-33875
https://doi.org/10.1115/IPACK2007-33875
View Paper titled, Hot Spot Cooling Using Recycled Energy
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Topics: Cooling, Energy efficiency, Computers, Recycling, Reliability, Temperature gradient, Waste heat
Proceedings Papers

Thermodynamics Energy Efficiency Analysis and Thermal Modeling of Data Center Cooling Using Open and Closed-Loop Cooling Systems

Ali Heydari
Proc. ASME. InterPACK2007, ASME 2007 InterPACK Conference, Volume 1, 859-870, July 8–12, 2007
Paper No: IPACK2007-33848
https://doi.org/10.1115/IPACK2007-33848
View Paper titled, Thermodynamics Energy Efficiency Analysis and Thermal Modeling of Data Center Cooling Using Open and Closed-Loop Cooling Systems
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Topics: Cooling, Cooling systems, Data centers, Energy efficiency, Modeling, Thermodynamics, Heat exchangers, Computational fluid dynamics, Refrigeration, Density
Proceedings Papers

Theoretical Modeling and Optimized Design of a Packaged Liquid Chiller

Ali Heydari, Saeed Kargar
Proc. ASME. HT2007, ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 1, 527-537, July 8–12, 2007
Paper No: HT2007-32839
https://doi.org/10.1115/HT2007-32839
View Paper titled, Theoretical Modeling and Optimized Design of a Packaged Liquid Chiller
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Topics: Design, Modeling, Heat exchangers, Simulation models, Compressors, Computers, Condensers (steam plant), Construction, Optimization, Shells
Proceedings Papers

Thermal Management of Electronic Equipment Using Closed and Open Loop Cooling Systems

Ali Heydari
Proc. ASME. HT2005, Heat Transfer: Volume 4, 877-884, July 17–22, 2005
Paper No: HT2005-72703
https://doi.org/10.1115/HT2005-72703
View Paper titled, Thermal Management of Electronic Equipment Using Closed and Open Loop Cooling Systems
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Topics: Cooling systems, Electronic equipment, Thermal management, Heat exchangers, Modeling, Cooling, Computational fluid dynamics, Refrigeration, Data centers, Computer cooling