A gas-atomized spray cooling system integrated with an ejector loop: Ejector modeling and thermal performance analysis

2019 ◽  
Vol 180 ◽  
pp. 106-118 ◽  
Author(s):  
Ji-Xiang Wang ◽  
Yun-Ze Li ◽  
Jia-Xin Li ◽  
Chao Li ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Thermal Performance ◽  
Cooling System ◽  
Spray Cooling

Spray Cooling for Time Resolved Emission Measurements of ICs

2004 ◽  
Author(s):  
Rama R. Goruganthu ◽  
David Bethke ◽  
Shawn McBride ◽  
Tom Crawford ◽  
Jonathan Frank ◽  
...  
Keyword(s):  
Heat Flux ◽  
Thermal Performance ◽  
Flip Chip ◽  
Cooling System ◽  
Spray Cooling ◽  
Junction Temperature ◽  
Maximum Temperature ◽  
Uniform Heat Flux ◽  
High Heat Flux ◽  
Time Resolved

Abstract Spray cooling is implemented on an engineering tool for Time Resolved Emission measurements using a silicon solid immersion lens to achieve high spatial resolution and for probing high heat flux devices. Thermal performance is characterized using a thermal test vehicle consisting of a 4x3 array of cells each with a heater element and a thermal diode to monitor the temperature within the cell. The flip-chip packaged TTV is operated to achieve uniform heat flux across the die. The temperature distribution across the die is measured on the 4x3 grid of the die for various heat loads up to 180 W with corresponding heat flux of 204 W/cm2. Using water as coolant the maximum temperature differential across the die was about 30 °C while keeping the maximum junction temperature below 95 °C and at a heat flux of 200 W/cm2. Details of the thermal performance of spray cooling system as a function of flow rate, coolant

Analytical modeling of a radiant cooling system for thermal performance analysis

2021 ◽  
Author(s):  
Arup Chandra Saha ◽  
Vikas Verma ◽  
Rahul Tarodiya ◽  
M.R. Mahboob ◽  
Rajesh Kumar
Keyword(s):  
Performance Analysis ◽  
Thermal Performance ◽  
Analytical Modeling ◽  
Cooling System ◽  
Radiant Cooling

scholarly journals Cost and Performance Goals for Commercial Active Solar Absorption Cooling Systems

1985 ◽  
Vol 107 (2) ◽  
pp. 136-140 ◽  
Author(s):  
M. L. Warren ◽  
M. Wahlig
Keyword(s):  
Performance Analysis ◽  
Solar System ◽  
Thermal Performance ◽  
Return On Investment ◽  
Simulation Analysis ◽  
Cooling System ◽  
Cooling Systems ◽  
System Cost ◽  
Solar Cooling ◽  
Absorption Cooling

Economic and thermal performance analysis is used to determine cost goals for typical commercial active solar cooling systems to be installed between the years 1986 and 2000. Market penetration for heating, ventilating, and air conditioning systems depends on payback period, which is related to the expected return on investment. Postulating a market share for solar cooling systems increasing to 20 percent by the year 2000, payback and return on investment goals as a function of year of purchase are established. The incremental solar system cost goals must be equal to or less than the 20-year percent value of future energy savings, based on thermal performance analysis, at the desired return on investment. The methodology is applied to determine the allowable incremental solar system cost for commercial-scale, 25-ton absorption cooling systems based on the thermal performance predicted by recent simulation analysis, Methods for achieving these cost goals and expected solar cooling system costs will be discussed.

The Effect of Chamber Pressure on the Thermal Performance of New Refrigerant R513a During Spray Cooling

2019 ◽  
Author(s):  
Nabeel M. Abdulrazzaq ◽  
Azzam S. Salman ◽  
Noble Anumbe ◽  
Amitav Tikadar ◽  
Saad K. Oudah ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Closed Loop ◽  
Cooling System ◽  
Heated Surface ◽  
Saturation Temperature ◽  
Spray Cooling ◽  
Copper Surface ◽  
Chamber Pressure ◽  
Refrigeration System ◽  
Spray Chamber

Abstract In this paper, the performance of a new low-GWP refrigerant R513a was experimentally investigated, during spray cooling. A spray cooling system was designed to work as a sub-system within a closed-loop refrigeration system. The influence of chamber pressure on heat flux and heat transfer coefficient were experimentally investigated. A smooth plain copper surface heated by a cartridge heater was cooled by the refrigerant (R513a) while flowing through a nozzle in the spray chamber. The results showed that chamber pressure has a significant impact on the overall thermal performance of the spray cooling operation. It was also determined that higher chamber pressures resulted in higher thermal performance. The highest chamber pressure attained in this study was 0.6 MPa. Furthermore, the surface temperature of the heated surface increased due to the increase of the saturation temperature of the liquid over the surface.

Dry and Wet-Peaking Tower Cooling Systems For Power Plant Application

1976 ◽  
Vol 98 (3) ◽  
pp. 335-346
Author(s):  
M. W. Larinoff ◽  
L. L. Forster
Keyword(s):  
Power Plant ◽  
Performance Analysis ◽  
Thermal Performance ◽  
Heat Sink ◽  
Cooling Tower ◽  
Cooling System ◽  
Water Requirements ◽  
Surface Type ◽  
Makeup Water ◽  
Cooling Systems

A new concept of power plant heat-sink system is presented which employs the combination of a conventional wet-tower and a conventional dry-tower. The purpose of this cooling system is to reduce wet cooling-tower makeup-water requirements in water-short areas. The dry tower operates all year around while the wet-peaking tower is used only above certain ambient dry-bulb temperatures. The two cooling circuits serve separate sections of a conventional, surface-type, steam condenser. Thermal performance analysis is presented for various combinations of cooling systems ranging from 100 percent wet to 100 percent dry. Annual makeup-water requirements are calculated for various sizes of towers located in 18 selected cities of the U.S.A. ranging from north to south and east to west.

The Oriented Spray Cooling System for Heat Rejection and Evaporation

2021 ◽  
Author(s):  
Chuck Bowman ◽  
Robert E. Taylor ◽  
Jerry D. Hubble
Keyword(s):  
Thermal Performance ◽  
Cooling System ◽  
Air Flow ◽  
Ambient Air ◽  
Nuclear Regulatory Commission ◽  
Spray Cooling ◽  
Analytical Models ◽  
Water Droplets ◽  
Flow Through ◽  
Regulatory Commission

Abstract Spray ponds offer significant advantages over mechanical draft cooling towers including superior simplicity and operability, lower preferred power requirements, and lower costs. Unlike a conventional spray pond in which spray nozzles are arranged in a flat bed and water is sprayed upward, the Oriented Spray Cooling System (OSCS) is an evolutionary spray pond design in which nozzles are mounted on spray trees arranged in a circle and are tilted at an angle oriented towards the center of the circle. Therefore, each nozzle is exposed to essentially ambient air as water droplets drag air into the spray region while the warm air concentrated in the center of the circle rises. Both of these effects work together to increase air flow through the spray region. Increased air flow reduces the local wet-bulb temperature of the air in the spray pattern, promoting heat transfer and more efficient cooling. The authors have developed analytical models to predict the thermal performance of the OSCS that are based on classical heat and mass transfer and kinetic vector relationships for spherical water droplets that rely only on generic experimental thermal performance data. The model is not limited in application with regard to spray pressure or nozzle spacing or orientation and is not limited by droplet size considerations. The paper compares the predicted performance of the OSCS with full-scale field test results that were measured in compliance with Nuclear Regulatory Commission requirements at the Columbia Generating Station where the ultimate heat sink is two OSCS.

The Oriented Spray Cooling System for Heat Rejection and Evaporation

2019 ◽  
Author(s):  
Charles F. Bowman ◽  
Robert E. Taylor ◽  
Jerry D. Hubble
Keyword(s):  
Thermal Performance ◽  
Cooling System ◽  
Air Flow ◽  
Ambient Air ◽  
Nuclear Regulatory Commission ◽  
Spray Cooling ◽  
Analytical Models ◽  
Water Droplets ◽  
Flow Through ◽  
Regulatory Commission

Abstract Spray ponds offer significant advantages over mechanical draft cooling towers (MDCT) including superior simplicity and operability, lower preferred power requirements, and lower capital and maintenance costs. Unlike a conventional spray pond in which spray nozzles are arranged in a flat bed and water is sprayed upward, the Oriented Spray Cooling System (OSCS) is an evolutionary spray pond design in which nozzles are mounted on spray trees arranged in a circle and are tilted at an angle oriented towards the center of the circle. As a result, each nozzle is exposed to essentially ambient air as water droplets drag air into the spray region while the warm air concentrated in the center of the circle rises. Both of these effects work together to increase air flow through the spray region. Increased air flow reduces the local wet-bulb temperature (LWBT) of the air in the spray pattern, promoting heat transfer and more efficient cooling. The authors have developed analytical models to predict the thermal performance of the OSCS that are based on classical heat and mass transfer and kinetic vector relationships for spherical water droplets that rely only on generic experimental thermal performance data. Therefore, the model is not limited in application with regard to spray pressure or nozzle spacing or orientation and is not limited by droplet size considerations. This paper describes specific details such as nozzle type, orientation, and drop spectrum and details on the analytical model never before published that are used to predict the OSCS performance. The paper compares the predicted performance of the OSCS with the rigorous full-scale field test results that were measured in compliance with Nuclear Regulatory Commission requirements at the Columbia Generating Station (CGS) where the ultimate heat sink (UHS) is two OSCS.

scholarly journals Thermal performance analysis of a traditional passive cooling system in Dezful, Iran

2019 ◽  
Vol 83 ◽  
pp. 291-302 ◽  
Author(s):  
Arezou Sadoughi ◽  
Charles Kibert ◽  
Fariba Mirmohammad Sadeghi ◽  
Soheil Jafari
Keyword(s):  
Performance Analysis ◽  
Thermal Performance ◽  
Cooling System ◽  
Passive Cooling ◽  
Passive Cooling System
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