scholarly journals Influence of cryogen spray cooling parameters on the heat extraction rate from a sprayed surface

2002 ◽  
Author(s):  
Emil Karapetian ◽  
Guillermo Aguilar ◽  
Enrique J. Lavernia ◽  
J. Stuart Nelson
Keyword(s):  
Spray Cooling ◽  
Extraction Rate ◽  
Heat Extraction ◽  
Cryogen Spray Cooling ◽  
Heat Extraction Rate

scholarly journals Dynamics of cryogen deposition relative to heat extraction rate during cryogen spray cooling

2000 ◽  
Author(s):  
Wim Verkruysse ◽  
Boris Majaron ◽  
Guillermo Aguilar ◽  
Lars O. Svaasand ◽  
J. Stuart Nelson
Keyword(s):  
Spray Cooling ◽  
Extraction Rate ◽  
Heat Extraction ◽  
Cryogen Spray Cooling ◽  
Heat Extraction Rate

Radial Heat Transfer Dynamics During Cryogen Spray Cooling

2004 ◽  
Author(s):  
Walfre Franco ◽  
Guo-Xiang Wang ◽  
J. Stuart Nelson ◽  
Guillermo Aguilar
Keyword(s):  
Heat Flux ◽  
Fast Response ◽  
Spray Cooling ◽  
Extraction Process ◽  
Temporal Variations ◽  
Heat Extraction ◽  
Skin Model ◽  
Maximum Heat ◽  
Cryogen Spray Cooling ◽  
Radial Heat

Cryogen spray cooling (CSC) is a heat extraction process that protects the epidermal layer during skin laser surgery of port wine stain (PWS) birthmarks and other specific dermatoses. The objective of the present work is to investigate temporal and radial variations on the heat transferred at the surface of a skin model during CSC. A fast-response thermal sensor is used to measure temperature across the radius of the sprayed surface of a skin model. These interior measurements along with an inverse heat conduction algorithm are used to determine the heat transferred at the surface. Results show that radial and temporal variations of the boundary conditions have a strong influence on the homogeneity of heat extraction from skin. However, there are subregions of uniform cooling. It is also observed that the surface heat flux undergoes a marked dynamic variation, with a maximum heat flux occurring at the center of the sprayed surface early in the spurt followed by a quick decrease. The study shows that external conditions must be taken into account and ideally controlled to guarantee uniform protection during CSC.

The Impacts of Different CO2 Injection Temperature on Heat Extraction Rate in CO2-EGS Based on CCS Demonstration Project

2012 ◽  
Vol 588-589 ◽  
pp. 21-26 ◽  
Author(s):  
Jin Na ◽  
Fu Gang Wang ◽  
Yan Shi ◽  
Zhi Min Cai
Keyword(s):  
Numerical Models ◽  
Extraction Rate ◽  
Demonstration Project ◽  
Heat Extraction ◽  
Geothermal System ◽  
Water Displacement ◽  
Operation Period ◽  
Injection Temperature ◽  
And Storage ◽  
Heat Extraction Rate

In this paper we use Majiagou geologic formation in Erdos Carbon Caputure and Storage(CCS) demonstration project aera as artificial geothermal reservoir, and create numerical models of Enhanced Geothermal System(EGS) using CO2 as a heat transfer carrier. In order to analyze the impacts of CO2 injection temperatures on heat extraction rate and the sustainability of CO2-EGS, five cases with different CO2 injection temperature are designed. Simulation results show that the range of the average heat extraction rate of case 1～5 is 6.56～8.47MW in the whole CO2-EGS operation period. The heat extraction rates vary over time, And it is 6.37～7.9MW in CO2 and water displacement stage and 6.64～8.68MW after aqueous phase dispear respectively. Injection temperature of CO2 significantly impacts the heat extraction rate of EGS .

scholarly journals Intermittent cryogen spray cooling for optimal heat extraction during dermatologic laser treatment

2002 ◽  
Vol 47 (18) ◽  
pp. 3275-3288 ◽  
Author(s):  
Boris Majaron ◽  
Lars O Svaasand ◽  
Guillermo Aguilar ◽  
J Stuart Nelson
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Heat Extraction ◽  
Optimal Heat ◽  
Cryogen Spray Cooling

scholarly journals A Comprehensive Study on Intermittent Operation of Horizontal Deep Borehole Heat Exchangers

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 307
Author(s):  
Ingen Perser ◽  
Ian Alistair Frigaard
Keyword(s):  
Flow Rate ◽  
Recovery Period ◽  
Extraction Rate ◽  
Heat Extraction ◽  
Flow Rate Ratio ◽  
Time Interval ◽  
Long Term Performance ◽  
Term Performance ◽  
Heat Extraction Rate

Utilizing a deep Borehole Heat Exchanger (BHE) has been recognized as a clean, renewable, low-carbon-emission, and sustainable way for heating of residential buildings and greenhouses. In this study, the long-term performance of horizontal deep BHE in intermittent mode is scrutinized. In this regard, to predict the transient heat transfer process in the deep BHEs, a mathematical model is developed and then verified by using the experimental results. The effect various key parameters including flow rate of circulating fluid, undisturbed ground temperature, inlet fluid temperature, and ground thermal conductivity on the thermal performance of deep BHE in continuous and intermittent mode is studied. According to the results, increasing the flow rate of circulating fluid, undisturbed ground temperature, and ground thermal conductivity is favorable for heat extraction rate. Moreover, the effect of three specific parameters for intermittent operation including periodic time interval, flow rate ratio, and recovery period ratio on the long-term performance of horizontal deep BHE are scrutinized. Based on the results, by decreasing the periodic time interval and increasing the flow rate ratio, the mean heat extraction rate in the period of 30 years is increased and the mean borehole’s wall temperature is decreased. Furthermore, by increasing the recovery period ratio, the heat extraction rate increases significantly while the total extracted energy decreases.

Preparation and Characterization of Super Pure Coal

2013 ◽  
Vol 798-799 ◽  
pp. 49-53 ◽  
Author(s):  
Yong Mei Cui ◽  
Yong Quan Xu ◽  
Yong Qi Hu ◽  
Zhong Kai Yuan ◽  
Li Ye Li ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Aromatic Hydrocarbons ◽  
Extraction Rate ◽  
Heat Extraction ◽  
Extraction Technology ◽  
Coal Residue ◽  
Heat Extraction Rate ◽  
Washing Oil

Industrial washing oil as solvent, super pure coal was extracted and prepared from raw coal using heat extraction technology. The structures of raw coal and super pure coal were characterized by thermogravimetry and Fu Liye infrared spectrum. The results showed that the heat extraction rate of super pure coal was decreased with the increasing of coalification degree. The ash of raw coal which were silicate and alumina can be concentrated by heat extraction technology into coal residue and the mixtures of various structure were mainly composed of aromatic hydrocarbons also can be extracted effectively.

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