Brittle SiC coatings have been successfully applied on Ni–Cr-based superalloy substrates to improve their oxidation resistance at high temperatures. The coating has been formed through the plastic deformation of the substrate with particle segmentation. The overlaid SiC layer shows the ability to slow down the outward chromium diffusion and hence sustaining the elemental content of the substrate. The formation of MoSi2 and SiO2 layers beneath SiC layer plays an important role in the oxidation rate reduction at elevated temperature environment. Scratch adhesion test result shows an excellent adhesion of SiC coating, as the coating delamination did not happen up to a 3.7 N load. Four-point bending tests also pointed out the strong adhesion of oxide scales, which is necessary for further oxidation prevention.

SiO2 and MoSi2 formation on Inconel 625 surface via SiC coating deposited by cold spray

A review on combustion behavior and mechanism of Ti alloys for advanced aero-engine

Apartments in South Korea have high maintenance costs and an average lifetime of 25 years due to poor construction qualities. The common apartment redevelopment strategy is completely demolishing the neighborhoods and then replacing them with new buildings. However, this research discusses the framework for the refurbishment of an existing building in Seoul using Building Information Modeling (BIM) and parametric tools. The virtual model of an exemplary existing building is constructed in a BIM environment. Parametric software is used to simulate the building’s environmental performance, in order to determine its energy demand for heating and cooling and the indoor comfort. In order to reduce the energy demand for heating and cooling, improve the indoor comfort, generate photovoltaic energy and extend the building’s lifetime, a modular building envelope renovation system is developed. Building simulation results of the improved building envelope are used to quantify the differences with the existing building. The research results illustrate significant improvements in energy performance, comfort and lifetime extension that can be achieved. Furthermore, a guideline for a streamlined building optimization process is provided, that can be transferred and used for the planning and optimization of other building renovation projects.

Development of a Building Information Modeling-Parametric Workflow Based Renovation Strategy for an Exemplary Apartment Building in Seoul, Korea

This article reviews the papers published in the Korean Journal of Air-Conditioning and Refrigeration Engineering during 2014. It is intended to understand the status of current research in the areas of heating, cooling, ventilation, sanitation, and indoor environments of buildings and plant facilities. Conclusions are as follows. (1) The research works on the thermal and fluid engineering have been reviewed as groups of heat and mass transfer, cooling and heating, and air-conditioning, the flow inside building rooms, and smoke control on fire. Research issues dealing with duct and pipe were reduced, but flows inside building rooms, and smoke controls were newly added in thermal and fluid engineering research area. (2) Research works on heat transfer area have been reviewed in the categories of heat transfer characteristics, pool boiling and condensing heat transfer and industrial heat exchangers. Researches on heat transfer characteristics included the results for thermal contact resistance measurement of metal interface, a fan coil with an oval-type heat exchanger, fouling characteristics of plate heat exchangers, effect of rib pitch in a two wall divergent channel, semi-empirical analysis in vertical mesoscale tubes, an integrated drying machine, microscale surface wrinkles, brazed plate heat exchangers, numerical analysis in printed circuit heat exchanger. In the area of pool boiling and condensing, non-uniform air flow, PCM applied thermal storage wall system, a new wavy cylindrical shape capsule, and HFC32/HFC152a mixtures on enhanced tubes, were actively studied. In the area of industrial heat exchangers, researches on solar water storage tank, effective design on the inserting part of refrigerator door gasket, impact of different boundary conditions in generating g-function, various construction of SCW type ground heat exchanger and a heat pump for closed cooling water heat recovery were performed. (3) In the field of refrigeration, various studies were carried out in the categories of refrigeration cycle, alternative refrigeration and modelling and controls including energy recoveries from industrial boilers and vehicles, improvement of dehumidification systems, novel defrost systems, fault diagnosis and optimum controls for heat pump systems. It is particularly notable that a substantial number of studies were dedicated for the development of air-conditioning and power recovery systems for electric vehicles in this year. (4) In building mechanical system research fields, seventeen studies were reported for achieving effective design of the mechanical systems, and also for maximizing the energy efficiency of buildings. The topics of the studies included energy performance, HVAC system, ventilation, and renewable energies, piping in the buildings. Proposed designs, performance performance tests using numerical methods and experiments provide useful information and key data which can improve the energy efficiency of the buildings.

http://koreascience.or.kr:80/article/JAKO201523348321532.pdf

Recent Progress in Air-Conditioning and Refrigeration Research: A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2014

High velocity oxy fuel process (HVOF) is an advanced coating process for thermal spraying of coatings on to components used in turbines. HVOF process is a thermal spray coating method and is widely used to apply wear, erosion, and corrosion protective coatings to the components used in industrial turbines. 25% (Cr3C2-25(Ni20Cr))

/pdf/combating-corrosion-degradation-of-turbine-materials-using-46tl4bo8vb.pdf

Combating Corrosion Degradation of Turbine Materials Using HVOF Sprayed 25% (Cr3C2-25(Ni20Cr))

Solar radiation through a window has a big effect on the heating, cooling load and lighting load of a building. This study aims to present the proper slope and optimal orientation range of a window in the southern area by reviewing the interior daylighting time and inflow point. This study simulated the slope change of 0°, 5°, 10°, 15°, and 20° each to the outside and the orientation division of W, S-45°-W, S, S-45°-E, E for this. As a result, the proper slope of a window was reviewed to be 10° and the optimal orientation of a window was reviewed to be S.

A Study on the Optimum Orientation and Slope Angle of Outside Walls

Energy Load according to the Units of Apartment House

The Strengthening Effect of the Heating and Cooling Load on the Thermal Performance in the Housing Unit

http://www.ndsl.kr/soc_img/society/kspse/DRGGBE/2016/v20n4/DRGGBE_2016_v20n4_63.pdf

Blind Optimal Operating Schedule for Reviewing the Energy Load Reduction of Apartment House

Comparison of the Energy Load according to the Balcony Types and Blind Installation

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