Thermal characteristics and performance of Ag-water nanofluid: Application to natural circulation loops

2017 ◽  
Vol 135 ◽  
pp. 9-20 ◽  
Author(s):  
Halil Dogacan Koca ◽  
Serkan Doganay ◽  
Alpaslan Turgut
Keyword(s):  
Natural Circulation ◽  
Thermal Characteristics ◽  
And Performance

scholarly journals The thermal characteristics of roofs: policy, installation and performance

2017 ◽  
Vol 132 ◽  
pp. 454-459 ◽  
Author(s):  
Clifford A Elwell ◽  
Harper Robertson ◽  
Jez Wingfield ◽  
Phillip Biddulph ◽  
Virginia Gori
Keyword(s):  
Thermal Characteristics ◽  
And Performance

The Plant Feature and Performance of DMS (Double MS: Modular Simplified and Medium Small Reactor)

2008 ◽  
Author(s):  
Yukiko Kawabata ◽  
Masayoshi Matsuura ◽  
Shizuka Hirako ◽  
Takashi Hoshi
Keyword(s):  
Economic Efficiency ◽  
Cooling System ◽  
Natural Circulation ◽  
Circulation System ◽  
Surface Separation ◽  
Power Company ◽  
Loss Of Coolant Accident ◽  
Core Cover ◽  
And Performance ◽  
Core Cooling

The Japan Atomic Power Company has initiative in developing the DMS concept as a 400MWe-class light water reactor. The main features of the DMS relative to overcoming the scale demerit are the miniaturization and simplification of systems and equipment, integrated modulation of construction, standardization of equipment layouts and effective use of proven technology. The decrease in primary containment vessel (PCV) height is achieved by reducing the active fuel length of the DMS core, which is about two meters compared with 3.7 meters in the conventional BWR. The short active fuel length reduces the drop in core pressure, and overcomes the natural circulation system. And by using the lower steam velocity in the upper plenum in the reactor pressure vessel (RPV), we can adopt a free surface separation (FSS) system. The FSS eliminates the need for a separator and thus helps minimize the RPV and PCV sizes. In order to improve safety efficiency, developing an Emergency Core Cooling System (ECCS) for the DMS was considered. The ECCS configuration in the DMS was examined to achieve core coverage and economic efficiency from the following. 1: Eliminating high-pressure injection systems. 2: Adopting passive safety-related systems. 3: Optimizing distribution for the systems and power source for the ECCS. In this way the configuration of the ECCS for the DMS was established, providing the same level of safety as the ABWR and the passive systems. Based on the results of Loss of Coolant Accident (LOCA) analysis, core cover can be achieved by this configuration. Therefore, the plant concept was found to offer both economic efficiency and safety.

scholarly journals Thermal Characteristics of High Temperature Naturally Circulating Helium Cooling Loop

2018 ◽  
Vol 68 (1) ◽  
pp. 1-10
Author(s):  
František Dzianik ◽  
Štefan Gužela ◽  
Eva Puškášová
Keyword(s):  
Heat Exchanger ◽  
Thermal Performance ◽  
Fast Reactor ◽  
Natural Circulation ◽  
Thermal Characteristics ◽  
Heat Removal ◽  
Operating Conditions ◽  
Reactor Model ◽  
Decay Heat ◽  
Thermal Calculations

Abstract The paper deals with the process properties in terms of the heat transfer, i.e. the thermal performance of the thermal-process units within a helium loop intended for the testing of the decay heat removal (DHR) from the model of the gas-cooled fast reactor (GFR). The system is characterised by a natural circulation of helium, as a coolant, and assume the steady operating conditions of the circulation. The helium loop consists of four main components: the model of the gas-cooled fast reactor, the model of the heat exchanger for the decay heat removal, hot piping branch and cold piping branch. Using the thermal calculations, the thermal performance of the heat exchanger model and the thermal performance of the gas-cooled fast reactor model are determined. The calculations have been done for several defined operating conditions which correspond to the different helium flow rates within the system.

scholarly journals Effect of Filling Ratio on Thermal Characteristics and Performance of a Pulsating Heat Pipe

2019 ◽  
Vol 9 (2) ◽  
pp. 3341-3345
Keyword(s):  
Heat Pipe ◽  
Thermal Characteristics ◽  
Filling Ratio ◽  
Working Fluid ◽  
Pulsating Heat Pipe ◽  
Key Factors ◽  
Condenser Section ◽  
Oscillating Heat Pipe ◽  
Bottom Heat ◽  
And Performance

Pulsating heat pipes are complex devices for heat transfer and their optimal thermal performance depends mainly on different parameters. This work is about the thermal efficiency of a closed-loop oscillating heat pipe with a diameter of 2.0 mm and 3.0 copper tube inner and outer. For all experiments, the filling ratio (FR) was used 40%, 50 %,70%,80% and heat inputs of 20W, 40W, 60W, and 80W was provided to PHP. The position of the PHP was vertical bottom heat type. The length of evaporator, adiabatic and condenser section was maintained 52 mm,170mm,60mm. Water and benzene were selected as working fluids. From the available literature it is observed that working fluid and filling ratio are key factors in PHP's performance. The results show that the thermal resistance decreases rapidly with the increase in the heat input to 20 to 40 W., while it decreases gradually over 40 to 80W.Simulation is done in CFD and experimental data were equated to the results.

Research of efficiency of solar coating in the heat supply system

2021 ◽  
Author(s):  
Stepan Shapoval ◽  
Nadiia Spodyniuk ◽  
Oleksandra Datsko ◽  
Pavlo Shapoval
Keyword(s):  
Development Strategy ◽  
Heat Supply ◽  
Natural Circulation ◽  
Thermal Characteristics ◽  
Heat Supply System ◽  
Physical Parameters ◽  
Forced Circulation ◽  
Average Value ◽  
Energy Efficient Buildings ◽  
Carrier Energy

AbstractAccording to the energy development strategy of Ukraine, implementation of energy efficient buildings is needed, in which external protections are converters of solar energy into heat. The article presents studies of solar coating with direct coolant supply. Studies of the average value of the heat loss coefficient of the solar coating were also carried out. As a result, the efficiency of the solar coating under the mode of forced circulation of the coolant is 0.67, at natural circulation of the coolant – 0.57 and at its direct supply is 0.71. Experimental researches of thermal and physical parameters of a solar covering and system of heat supply on its basis showed in the corresponding dependences influence on its thermal characteristics of dynamic modes of the heat carrier, energy, kinetic characteristics of the environment.

Thermal characteristics and performance of salt gradient solar ponds

1987 ◽  
Vol 11 (3) ◽  
pp. 343-357 ◽  
Author(s):  
R. S. Beniwal ◽  
Ramvir Singh ◽  
P. V. Bakore
Keyword(s):  
Thermal Characteristics ◽  
Solar Ponds ◽  
Salt Gradient ◽  
And Performance

scholarly journals Water-Soluble Copper Ink for the Inkjet Fabrication of Flexible Electronic Components

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2218
Author(s):  
Nabi S. Shabanov ◽  
Kamil Sh. Rabadanov ◽  
Sagim I. Suleymanov ◽  
Akhmed M. Amirov ◽  
Abdulgalim B. Isaev ◽  
...  
Keyword(s):  
Flexible Substrate ◽  
Thermal Characteristics ◽  
Decomposition Temperature ◽  
Complex Compounds ◽  
Water Soluble ◽  
X Ray Diffraction ◽  
Electronic Components ◽  
Electrical Measurements ◽  
X Ray ◽  
And Performance

The aim of this work is preparation and investigation of copper conductive paths by printing with a different type of functional ink. The solutions based on copper-containing complex compounds were used as inks instead of dispersions of metal nanoparticles. Thermal characteristics of synthesized precursors were studied by thermogravimetry in an argon atmosphere. Based on the comparison of decomposition temperature, the dimethylamine complex of copper formate was found to be more suitable precursor for the formation of copper layers. Structure and performance of this compound was studied in detail by X-ray diffraction, test of wettability, printing on flexible substrate, and electrical measurements.

Conceptual Design of an Advanced Water/Steam Receiver for a Solar Thermal Central Power System

1983 ◽  
Vol 105 (1) ◽  
pp. 34-41 ◽  
Author(s):  
S. F. Wu ◽  
T. V. Narayanan ◽  
D. N. Gorman
Keyword(s):  
Power System ◽  
Conceptual Design ◽  
Natural Circulation ◽  
Thermal Power ◽  
Receiver Design ◽  
Water Steam ◽  
Concentrated Solar Energy ◽  
Thermal Power System ◽  
Receiver Unit ◽  
And Performance

This paper describes the conceptual design of an advanced water/steam receiver for a commercial-scale solar central receiver thermal power system. The objective was to develop a receiver concept featuring an optimum combination of cost, performance, and reliability. While interfaces with other major subsystems of the complete power plant were recognized, emphasis was on the design and and performance of the receiver. The baseline thermal rating of this receiver was 550 MW, and the steam outlet conditions were 12,860 kPa and 516 C. After technical and econmic evaluations, a quad-cavity, natural-circulation concept was selected as the preferred receiver design. It consists of four separate cavities in a single receiver unit, each cavity receiving concentrated solar energy from one quadrant of a surrounding heliostat field.

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