Comparative studies of energy saving polymers and fabrication of high performance transparent polymer by solvent bonding

2018 ◽  
Vol 39 (1) ◽  
pp. 68-75
Author(s):  
S.P. Aadhy ◽  
T. Hema Sinega ◽  
C. Karthikeyan ◽  
S. Akshay ◽  
Mohan Kumar Pitchan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
High Performance ◽  
Solvent Mixture ◽  
Heat Transfer Analysis ◽  
Compression Moulding ◽  
Lap Shear ◽  
Visible Wavelengths ◽  
Pass Through ◽  
Solvent Bonding

Abstract This work investigates the possibility of using polyetherimide (PEI) as an energy saving alternative to glass, polymethylmethacrylate (PMMA) and polycarbonate (PC) by carrying out heat transfer analysis and suggests vaporized solvent bonding as a viable bonding technique for the fabrication of PEI. By heat transfer analysis using building energy simulation, it is observed that less energy is expended for space-conditioning of a building with windows made of PEI when compared to glass, PMMA and PC. The compression moulding technique is used to mould PEI and fabrication is done using a solvent mixture of dimethyl sulfoxide and tetrahydrofuran in 1:1 ratio. The optical properties of the bonded specimen are studied using UV-visible spectrophotometry and it is found that PEI does not allow UV wavelength radiation to pass through while transmitting visible wavelengths. The mechanical strength of the bond is tested using lap shear tensile strength test and the type of failure is observed to be cohesive from the structure. This is indicative of the fact that using this particular solvent to bond PEI results in the maximum possible strength.

Heat Transfer Analysis and Energy-Saving Methods of the Exterior Windows in the Northern Area

2014 ◽  
Vol 881-883 ◽  
pp. 1233-1236
Author(s):  
Zhong Hua Wang
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Energy Saving ◽  
Outdoor Environment ◽  
Heat Transfer Analysis ◽  
Radiation Heat ◽  
Mathematical Formula ◽  
Factors Affecting ◽  
Northern Area ◽  
Indoor And Outdoor

In this paper, ways of heat transfer through windows and doors between the indoor and outdoor environment in the northern area are summarized. And every heat transfer way is described by mathematical formula. On this basis, methods to improve the energy saving performance of exterior windows are put forward according to factors affecting heat transfer through windows. The first method is increasing solar radiation heat, and then reducing heat loss by infiltration, and increasing the thermal resistance as much as possible. Ideal form of energy-saving window is proposed based on compared windows with different material and thermal resistance.

A Kind of Energy Saving Method Based on Improving Turbine Condenser Vacuum

2011 ◽  
Vol 347-353 ◽  
pp. 3116-3119
Author(s):  
Jing Hong Yao
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
Cooling Water ◽  
Economic Indicator ◽  
Heat Transfer Analysis ◽  
Vacuum System ◽  
Cooling Water Temperature ◽  
Heat Transfer Efficiency ◽  
Turbine Condenser ◽  
Production Practice

Vacuum is an important economic indicator of influencing turbine load and thermal efficiency. And heat transfer efficiency affects the level of vacuum directly. From the point of heat transfer analysis, combining with the production practice in a power plant, this paper proposes a method of improving heat transfer effectiveness and the condenser exchanging condition. Through the method of reducing the heat load of condenser, improving the tightness of the vacuum system, cleaning the heat surface and reducing the cooling water temperature, we improve the vacuum and reach the aim of energy saving.

Particle Scale Heat Transfer Analysis in Rotary Kiln

2012 ◽  
Author(s):  
Amit Ravindra Amritkar ◽  
Danesh Tafti ◽  
Surya Deb
Keyword(s):  
Heat Transfer ◽  
Rotary Kiln ◽  
Granular Media ◽  
Particle Surface ◽  
Convection Heat Transfer ◽  
Heat Transfer Analysis ◽  
Convection Heat ◽  
Bed Temperature ◽  
Rotary Kilns ◽  
Pass Through

Rotary furnaces have multiple applications including calcination, pyrolysis, carburization, drying, etc. Heat transfer through granular media in rotary kilns is a complex phenomenon and plays an important role in the thermal efficiency of rotary furnaces. Thorough mixing of particles in a rotary kiln determines the bed temperature uniformity. Hence it is essential to understand the particle scale heat transfer modes through which the granular media temperature changes. In this study, numerical simulations are performed using coupled Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD) to analyze heat transfer in a non-reacting rotary kiln. The microscopic models of particle-particle, particle-fluid, particle-surface and fluid-surface heat transfer are used in the analysis. The heat transfer simulations are validated against experimental data. The effect of particle cascading on the bed temperature is measured and contributions from various modes of particle scale heat transfer mechanisms are reported. Particles are heated near the rotary kiln walls by convection heat transfer as they pass through the thermal boundary layer of the heated fluid. These particles are transported to the center of the kiln where they transfer heat to the cooler particles in the core of the kiln and back to the cooler fluid at the center of the kiln. It is found that 90% of the heat transferred to particles from the kiln walls is a result of convection heat transfer, whereas only 10% of the total heat transfer is due to conduction from the kiln walls.

A new PvT device for high performance thermoplastics: Heat transfer analysis and crystallization kinetics identification

2015 ◽  
Vol 45 ◽  
pp. 152-160 ◽  
Author(s):  
Baptiste Pignon ◽  
Xavier Tardif ◽  
Nicolas Lefèvre ◽  
Vincent Sobotka ◽  
Nicolas Boyard ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Crystallization Kinetics ◽  
High Performance ◽  
Heat Transfer Analysis

Conjugate Heat Transfer Analysis of a Cooled Turbine Blade Using Frozen Rotor Approach

2015 ◽  
Author(s):  
Kuo-San Ho ◽  
Jong Liu ◽  
Christopher Urwiller ◽  
S. Murthy Konan ◽  
Bruno Aguilar
Keyword(s):  
Heat Transfer ◽  
Gas Turbines ◽  
High Performance ◽  
Conjugate Heat Transfer ◽  
Cfd Simulation ◽  
Heat Transfer Analysis ◽  
Research Papers ◽  
Ansys Cfx ◽  
Computational Fluid Dynamics Cfd ◽  
Maximum Temperatures

In recent years, conjugate heat transfer (CHT) computational fluid dynamics (CFD) simulation in turbomachinery played an important role in predicting metal temperature. Most of research papers of CHT CFD simulation were emphasized on the mixing plane method. In this paper the ANSYS CFX 14.0 CHT simulation using the frozen rotor approach is employed to predict the blade temperatures. The frozen rotor included five time instances in which the stator-rotor wake influence could be captured. In this study, the temperature predictions using the frozen rotor approach were compared to the mixing plane predictions and Silicon Carbide (SiC) chip measurements on three different radial spans. The frozen rotor results predicted the minimum and maximum temperatures that bounded the SiC chip data. Compared to the mixing plane predictions, the frozen rotor approach results were similar within 8 K at the mid-span. However, the frozen rotor approach provided more insight information and detailed guidance for model calibration. Finally several future works were suggested to continue striving for high performance gas turbines.

Applicability of Heat Mirrors in Reducing Thermal Losses in Concentrating Solar Collectors

2018 ◽  
Vol 10 (6) ◽  
Author(s):  
Vikrant Khullar ◽  
Prashant Mahendra ◽  
Madhup Mittal
Keyword(s):  
Heat Transfer ◽  
Thermal Efficiency ◽  
Heat Transfer Analysis ◽  
Transfer Model ◽  
Receiver Design ◽  
Parabolic Trough ◽  
Coated Glass ◽  
Pass Through ◽  
Steady State Heat Transfer ◽  
Glass Envelope

Abstract In the present work, a novel parabolic trough receiver design has been proposed. The proposed design is similar to the conventional receiver design except for the envelope and the annulus part. Here, a certain portion of the conventional glass envelope is coated with Sn-In2O3 and also Sn-In2O3 coated glass baffles are provided in the annulus part to reduce the radiative losses. The optical properties of the coated glass are such that it allows most of the solar irradiance to pass through, but reflects the emitted long wavelength radiations back to the absorber tube. Sn-In2O3 coated glass is referred to as “transparent heat mirror.” Thus, effectively reducing the heat loss area and improving the thermal efficiency of the solar collector. A detailed one-dimensional steady-state heat transfer model has been developed to predict the performance of the proposed receiver design. It was observed that while maintaining the same external conditions (such as ambient/initial temperatures, wind speed, solar insolation, flow rate, and concentration ratio), the heat mirror-based parabolic trough receiver design has about 3–5% higher thermal efficiency as compared to the conventional receiver design. Furthermore, the heat transfer analysis reveals that depending on the spatial incident solar flux distribution, there is an optimum circumferential angle (θ = θoptimum, where θ is the heat mirror circumferential angle) up to which the glass envelope should be coated with Sn-In2O3. For angles higher than the optimum angle, the collector efficiency tends to decrease owing to increase in optical losses.

Design, analysis, and performance verification of a water jet thruster for amphibious jumping robot

2019 ◽  
Vol 233 (15) ◽  
pp. 5431-5447 ◽  
Author(s):  
Jixue Mo ◽  
Zhihuai Miao ◽  
Bing Li ◽  
Yunlu Zhang ◽  
Zhendong Song
Keyword(s):  
Heat Transfer ◽  
Liquid Nitrogen ◽  
High Performance ◽  
Volume Fraction ◽  
Water Jet ◽  
Heat Transfer Analysis ◽  
Underwater Robots ◽  
Ansys Fluent ◽  
Jumping Robot ◽  
Dynamics Simulations

In nature, certain aquatic animals and seabirds are capable of leaping from water surface and overcoming aquatic obstacles with ease. Inspired by that, researchers have developed various underwater robots, which can perform the aquatic jumping motion. Although there are several ways to achieve it, the water jet propulsion is the most appropriate approach for the amphibious jumping robot, which is under development. In this paper, a high-performance water jet thruster powered by liquid nitrogen is proposed to be the potential actuator for the amphibious jumping robot. The theoretical jumping model is built to optimize the initial volume fraction of water inside thruster and analyze its parameters' variation during water jet. Then the computational fluid dynamics simulations by ANSYS FLUENT software are carried out to analyze the self-pressurization process of liquid nitrogen as well as the water jet process. Finally, the proof-of-concept outdoor experiments present that the 3.7 kg thruster's maximum aquatic and terrestrial jumping heights are 25.1 m and 24.4 m, respectively. A simple heat transfer analysis between water and liquid nitrogen is also conducted, and the order of magnitude estimation of heat transfer coefficient is given to be 265W/ (m2·K) based on the experimental reaction time.

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