Epoxy resins are widely used as dielectric materials in electrical and electronic systems. This study demonstrates that small amounts of chemical modifiers can significantly enhance epoxy resin performance.

Air free-cooled data centers (DCs) have not existed in the tropical zone due to unique challenges of year-round high ambient temperature and relative humidity (RH). The increasing availability servers that can tolerate higher temperatures RH regulatory bodies’ prompts raise DC setpoints sheds light upon feasibility air DCs tropics. However, complex psychrometric dynamics, operating tropics generally requires adaptive control supply condition maintain computing performance reliability...

Abstract: Fluid dynamic forces in centrifugal blood pump impellers are of key importance destruction red cells (RBCs) because high rotational speed leads to strong interaction between the impeller and RBCs. In this paper, three‐dimensional models five different blade geometries investigated numerically using commercial software CFX‐TASCflow, streaklines RBCs obtained Lagrangian particle tracking method. reality, pass through along complicated paths resulting a highly irregular loading...

Air free-cooled data centers (DCs) have not existed in the tropical zone due to unique challenges of year-round high ambient temperature and relative humidity (RH). The increasing availability servers that can tolerate higher temperatures RH regulatory bodies' prompts raise DC setpoints sheds light upon feasibility air DCs tropics. This paper studies problem controlling supplied a below certain thresholds maintain servers' computing performance reliability. To achieve goal, portion hot...

This article presents numerical investigations of the effect radial gap and volute tongue position on circumferential pressure distribution magnitude resulting imbalanced force. A series models was designed using constant mean velocity method. The results indicate that a clearance 10% is good practical value gives relatively high head across pump for small show at 30 degrees lowest force head. 15 appears to give best compromise producing generated only 5% less than maximum while about 22%

For sustainability and environmental friendliness, renewable energy (RE) distributed generation (DG), for example, photovoltaic, are being integrated in electrical systems many countries. RE DG, however, can be unstable the power grid. As grid integrates an increasing amount of we present technical solutions along with economic incentive model to enable data centers serve as a novel "interruptible" load (i.e. that scaled down temporally) stabilize We propose real-time analytics framework...

This paper reports a new method of refrigerant flow control in full-scale commercial container refrigeration system. Fuzzy logic control, which has gained popularity recent years due to its simplicity application practical situations demanding non-mathematical model based strategy, is applied the superheat using an electronic expansion valve. A comparison between conventional proportional-integral and derivative controls was made with fuzzy control. It shown that controller performed better...

Abstract Fuzzy logic is applied to the control of superheat in evaporator a commercial container refrigeration system using an electronic expansion valve and adaptive algorithm has been devised enhance performance. Superheat hunting reduced, improvement 7.5 % coefficient performance can be realized as compared constant strategy. Intelligent gives more stable initial pull-down effects faster pulldown rate temperature box.

This article presents computational studies on the effects of inlet guide vanes (IGVs) flow pattern and shear stress in a centrifugal blood pump. The effect IGVs is to introduce pre-swirl fluid particles entering impeller with intention that will travel along blade profile. Currently, most commercial pumps employ straight radial blades are not hydrodynamically ideal for good within passage. Flow separation formation vortices passage believed increase degree hemolysis thrombosis. These causes...

This paper presents a comparison of manufacturing techniques used in the development an axial blood pump impeller. In this process impeller was designed and its performance evaluated with aid computational fluid dynamics (CFD). Prototypes those designs where CFD results show promise were needed sufficient quantities at low cost for experimental validation results. As is less than 16 mm diameter maximum blade thickness about 1.5 mm, innovative are explored to determine best quick fabrication...

At present, climate change and rising energy prices motivate the researchers to focus on better utilization of for space cooling applications. The chilled beam system has already been widely used in Europe cooling. But, condensation ceiling panel limits its application hot humid climates. Operating a such warm requires integration desiccant system, which needs be regenerated thermally purpose indoor air quality control. This paper emphasis performance analysis integrated with building...

We describe the development of a methodology for predicting effects multi-parameter changes on energy use large buildings. The is based third-order Taylor series expansion whose coefficients are evaluated several key building parameters. was coded performance simulation by DOE-2 computer program. A database results created from which were derived. Test using this provided reasonably accurate estimates total and cooling generic in Singapore.

Abstract This article proposes a phenomenological model to predict the leakage flow in clearance gap of shrouded centrifugal blood pumps. A good washout between rotating impeller surfaces and volute casing is essential avoid thrombosis. However, excessive will result higher fluid shear stress that may lead hemolysis. Computational dynamics (CFD) analysis was performed investigate miniaturized pump operating at speed 2000 rpm. Based on an analytical derived earlier, proposed flow. The rate...

A series of numerical models are generated to investigate the flow characteristics and performance an axial blood pump. The pump model includes a straightener, inducer-impeller, diffuser. Numerical studies effects angular alignment inducer impeller blades clearance gap between presented in this article. derived from simulation validated with experimental data. Numerically simulated results showed sinusoidal variation pressure across changes impeller. This is attributed additional losses when...

At present, a co-location data center often applies an identical and low temperature setpoint for its all server rooms. Although increasing the is rule-of-thumb approach to reducing cooling energy usage, tenants may have different mentalities technical constraints in accepting higher setpoints. Thus, supporting distinct setpoints desirable pursuing efficiency. This support calls new power attribution scheme address inter-room heat transfers that can be up 9% of load as shown our real...

The current study focuses on modeling the server-rack airflow and heat transfer interaction in a data center. In typical computing facility, requirements are often gradually built-up. For example, this instance, two servers placed rack designed for six-server stack. Each server will be separately modeled to required specifications, also so that their numbers placement can changed. mass flow rate through is determined by examining how pressure profiles develop at inlet outlet. This then...

This paper presents computational fluid dynamics (CFD) studies of a centrifugal blood pump. 3-D models five different blade geometries are investigated numerically using CFX-TASCflow. The impellers were designed an inverse design technique where the swirl distributions prescribed. results showed flow in impeller passages is highly dependent on profiles. radial unsatisfactory as separates at leading edge suction side. Flow confined mainly to pressure Design 2, with inlet angle 6.7° and outlet...