scholarly journals Patent landscape of not-in-kind active cooling technologies between 1998 and 2017

2021 ◽  
pp. 126507
Author(s):  
Renaldi Renaldi ◽  
Nicole D. Miranda ◽  
Radhika Khosla ◽  
Malcolm D. McCulloch
Keyword(s):  
Active Cooling ◽  
Patent Landscape

Thermo-energetic modelling of machine tool spindles with active cooling based on macro models

2016 ◽  
Vol 9 (3) ◽  
pp. 197 ◽  
Author(s):  
Simon Züst ◽  
Florentina Pavliček ◽  
Ludger Josef Fischer ◽  
Lukas Weiss ◽  
Konrad Wegener
Keyword(s):  
Machine Tool ◽  
Active Cooling

scholarly journals Influence of Active Cooling at the Trailing Edge on the Thermal Behavior of a Tilting-Pad Journal Bearing

Lubricants ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 26
Author(s):  
Nico Buchhorn ◽  
Michael Stottrop ◽  
Beate Bender
Keyword(s):  
Heat Transfer ◽  
Thermal Behavior ◽  
Experimental Results ◽  
Transfer Coefficients ◽  
Trailing Edge ◽  
Active Cooling ◽  
Oil Supply ◽  
Tilting Pad ◽  
Carry Over ◽  
Lower Temperature

In tilting-pad journal bearings (TPJB) with a non-flooded lubrication concept, higher maximum pad temperatures occur than with a flooded bearing design due to the lower convective heat transfer at the pad edges. In this paper, we present an approach to influence the thermal behavior of a five-pad TPJB by active cooling. The aim of this research is to investigate the influence of additional oil supply grooves at the trailing edge of the two loaded pads on the maximum pad temperature of a large TPJB in non-flooded design. We carry out experimental and numerical investigations for a redesigned test bearing. Within the experimental analysis, the reduction in pad temperature is quantified. A simulation model of the bearing is synthesized with respect to the additional oil supply grooves. The simulation results are compared with the experimental data to derive heat transfer coefficients for the pad surfaces. The experimental results indicate a considerable reduction of the maximum pad temperatures. An overall lower temperature level is observed for the rear pad in circumferential direction (pad 4). The authors attribute this effect by a cooling oil carry-over from the previous pad (3). Within the model limits, a good agreement of the simulation and experimental results can be found.

Effect of the CMT advanced process combined with an active cooling technique on macro and microstructural aspects of aluminum WAAM

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Felipe Ribeiro Teixeira ◽  
Fernando Matos Scotti ◽  
Ruham Pablo Reis ◽  
Américo Scotti
Keyword(s):  
Electrical Signal ◽  
Management Technique ◽  
Marginal Effect ◽  
Thin Wall ◽  
Cold Metal Transfer ◽  
Content Type ◽  
Active Cooling ◽  
Cold Metal ◽  
Wire Arc Additive Manufacturing ◽  
Cooling Technique

Purpose This paper aims to assess the combined effect of the Cold Metal Transfer (CMT) advanced process and of a thermal management technique (near immersion active cooling [NIAC]) on the macro and microstructure of Al wall-like preforms built by wire arc additive manufacturing (WAAM). As specific objective, it sought to provide information on the effects of the electrode-positive/electrode-negative (EP/EN) parameter in the CMT advanced process fundamental characteristics. Design/methodology/approach Initially, bead-on-plate deposits were produced with different EP/EN ratios, still keeping the same deposition rate, and the outcomes on the electrical signal traces and bead formation were analyzed. In a second stage, the EP/EN parameter and the layer edge to water distance (LEWD) parameter from the NIAC technique were systematically varied and the resultant macro and microstructures compared with those formed by applying natural cooling. Findings Constraints of EP/EN setting range were uncovered and discussed. The use of the NIAC technique favors the formation of finer grains. For a given EP/EN value, a variation in the NIAC intensity (LEWD value) showed marginal effect on grain size. When the EP/EN parameter effect is isolated, i.e. for a given LEWD setting, it was observed that an increase in the EP/EN level favors coarser grains. Originality/value Both the EP/EN parameter and the use of an active cooling technique (NIAC) might be used, even in combination, as effective tools for achieving proper macro and microstructure in WAAM of thin wall builds.

scholarly journals Association between active cooling and lower mortality among patients with heat stroke and heat exhaustion

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0259441
Author(s):  
Jun Kanda ◽  
Shinji Nakahara ◽  
Shunsuke Nakamura ◽  
Yasufumi Miyake ◽  
Keiki Shimizu ◽  
...  
Keyword(s):  
Hospital Mortality ◽  
Core Body Temperature ◽  
Heat Stroke ◽  
Case Series ◽  
Clinical Findings ◽  
Hospital Death ◽  
Heat Illness ◽  
Heat Exhaustion ◽  
Active Cooling ◽  
Severe Group

Body cooling is recommended for patients with heat stroke and heat exhaustion. However, differences in the outcomes of patients who do or do not receive active cooling therapy have not been determined. The best available evidence supporting active cooling is based on a case series without comparison groups; thus, the effectiveness of this method in improving patient prognoses cannot be appropriately quantified. Therefore, we compared the outcomes of heat stroke patients receiving active cooling with those of patients receiving rehydration-only therapy. This prospective observational multicenter registry-based study of heat stroke and heat exhaustion patients was conducted in Japan from 2010 to 2019. The patients were stratified into the “severe” group or the “mild-to-moderate” group, per clinical findings on admission. After conducting multivariate logistic regression analyses, we compared the prognoses between patients who received “active cooling + rehydration” and patients who received “rehydration only,” with in-hospital death as the endpoint. Sex, age, onset situation (i.e., exertional or non-exertional), core body temperature, liver damage, renal dysfunction, and disseminated intravascular coagulation were considered potential covariates. Among those who received active cooling and rehydration-only therapy, the in-hospital mortality rates were 21.5% and 35.5%, respectively, for severe patients (n = 231) and 3.9% and 5.7%, respectively, for mild-to-moderate patients (n = 578). Rehydration-only therapy was associated with a higher in-hospital mortality in patients with severe heat illness (adjusted odds ratio [aOR], 3.29; 95% confidence interval [CI], 1.21–8.90), whereas the cooling methods were not associated with lower in-hospital mortality in patients with mild-to-moderate heat illness (aOR, 2.22; 95% CI, 0.92–5.84). Active cooling was associated with lower in-hospital mortality only in the severe group. Our results indicated that active cooling should be recommended as an adjunct to rehydration-only therapy for patients with severe heat illness.

scholarly journals Active cooling photovoltaic with IoT facility

2021 ◽  
Vol 12 (3) ◽  
pp. 1494
Author(s):  
Muhammad Nizam Kamarudin ◽  
Sahazati Md. Rozali ◽  
Mohd Saifuzam Jamri
Keyword(s):  
Real Time ◽  
Cooling System ◽  
Solar Panel ◽  
State Of Charge ◽  
Photovoltaic System ◽  
Passive Cooling ◽  
Active Cooling ◽  
Passive Cooling System ◽  
Pv Power Generation ◽  
Sunlight Intensity

Harvesting energy from the sun makes the photovoltaic (PV) power generation a promising technology. To obtain a consistent state of charge (SOC), consistent energy must be harvested and efficiently directed to the battery. Overcharging or undercharging phenomena decreases the lifetime of the battery. Besides, the effect of irradiance toward solar in term of sunlight intensity effects the efficiency and hence, sluggish the SOC. The main problem of the solar panel revealed when the temperature has increased, the efficiency of solar panel will also be decreased. This manuscript reports the finding of developing an automatic active cooling system for a solar panel with a real time energy monitoring system with internet-of-things (IoT) facility. The IoT technology assists user to measure the efficiency of the solar panel and SOC of the battery in real time from any locations. The automatic active cooling system is designed to improve the efficiency of the solar panel. The effectiveness of the proposed system is proven via the analysis of the effect of active cooling toward efficiency and SOC of photovoltaic system. The results also tabulate the comparative studies of active-to-passive cooling system, as well as the effect of cooling towards SOC and efficiency of the solar panel.

scholarly journals Effects Of Active Cooling Following Simulated Military Work In The Heat

2021 ◽  
Vol 53 (8S) ◽  
pp. 351-351
Author(s):  
Margaret C. Morrissey ◽  
Ciara N. Manning ◽  
Douglas J. Casa
Keyword(s):  
Active Cooling ◽  
Military Work

A hollow microlattice based ultralight active thermal control device and its fabrication techniques and thermal performances

2021 ◽  
Author(s):  
Wenjun Xu ◽  
Longquan Liu ◽  
Junming Chen ◽  
Xinying Lv ◽  
Yongtao Yao
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Forced Convection ◽  
Liquid State ◽  
High Efficiency ◽  
Thermal Control ◽  
Test System ◽  
Control Device ◽  
Active Cooling ◽  
Change Material

Abstract This paper introduces a new thermal control device which has not only low weight and high efficiency but also passive and active cooling capabilities. The thermal control device mainly consists of hollow graphene-enhanced-metallic microlattice material, phase change material (PCM) and a peristatic pump. The PCM is inside the spatial-interconnected millimeter-scale diameter tubes, which are the basic constitution of the hollow microlattice material, in addition, the peristatic pump was connected with the tubes and used to force the liquid-state PCM to circulate inside the interconnected thin tubes. Thus, the proposed thermal control device takes combined advantages of the ultralight and high thermal transfer properties of the hollow graphene-enhanced-metallic microlattice materials, the thermal storage capability of the PCM and forced convection of the PCM driven by the peristatic pump as the PCM is in liquid state. The manufacturing process of the active thermal control device was also developed and proposed, which mainly includes additive manufacturing, composite electroless plating, polymer etching, liquid phase change material injecting and the peristatic pump connecting. In addition to that, a thermal test system was built and the effective thermal conductivities of the thermal control device in passive cooling and with active cooling modes were experimentally studied. The thermal control device can absorb heat and actively dissipate heat by means of forced convection. Consequently, the proposed active thermal control device can be used to guarantee the electronic components and spacecrafts operate in a specific temperature range.

Active cooling system for downhole electronics in high temperature environments

2021 ◽  
pp. 1-16
Author(s):  
Wei Minghui ◽  
Cai Wei ◽  
Xu Mingze ◽  
Deng Shuang
Keyword(s):  
High Temperature ◽  
Cooling System ◽  
Capillary Tube ◽  
Thermal Characteristics ◽  
Electric Circuit ◽  
Passive Cooling ◽  
Electronic Components ◽  
Active Cooling ◽  
Temperature Environment ◽  
High Temperature Environment

Abstract Downhole high temperature environment is an important factor affecting the performance of downhole instrument electronic system.At present, various active cooling technologies and passive cooling technologies have been proposed to reduce the temperature of downhole electric circuit system.However, passive cooling technologies can only provide limited cooling capacity for drilling tools under high temperature environment, and the duration of cooling is short, which can not meet the long-time drilling task.This paper presents an Active cooling system(ACS)for downhole electronics and the effects of different temperatures on the performance of electronic components are analyzed.The ACS mainly includes a micro supercharger, condenser tube, evaporation pipe, capillary tube and refrigerant.The theoretical analysis of heat transfer and refrigerant capacity in high temperature environment is carried out.The thermal characteristics of the ACS is evaluated experimentally.The results show that the temperature of electronic components can be reduced to below 163°C in the 200°C downhole environment and components.The geomagnetic field data measured by electronic components at room temperature, 200 °C and with ACS are compared.The results show that ACS can keep electronic components working normally.

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