Natural convection

Remote Radio Unit RRU 4G LTE Heatsink systems works based on the natural convection cooling, usually working outdoors in the harsh conditions of temperature, humidity, hoarfrost. In this study, the paper uses a real model of 4G RRU device with the capacity of 2x40W and 2x60W. Model is made of parallel heat sinks and is naturally cooled.

5p vijeff 01-12-2023 6 3   Download

The natural convection method is used in many advanced nuclear reactors, such as Generation IV and Small Modular Reactors to improve the safety and reliability. In order to investigate the natural circulation (NC) behavior in A NuScale Power Module Reactor, a numerical study on the NC in primary system for such kind of reactor was obtained by using RELAP5.

10p vicedric 08-02-2023 5 3   Download

Cooling of an outer wall of a containment vessel (CV) is expected as an effective accident management method to cool down fluid and structure in a CV during a severe accident. On the other hand, there are the following possibilities.

15p vironald 15-12-2022 8 3   Download

(BQ) Ebook Fundamentals of thermal fluid sciences (5th edition): Part 2 presents the following content: Mechanisms of heat transfer; steady heat conduction; transient heat conduction; forced convection; natural convection; radiation heat transfer; heat exchangers.

444p runordie6 10-08-2022 9 5   Download

Lecture Renewable energy sources. After completing this section, you will understand knowledge about: energy scenario and renewable energy sources: global and Indian situation. Potential of nonconventional energy sources, economics. Solar Radiation: Solar thermal process, heat transfer devices, solar radiation measurement, estimation of average solar radiation. Solar energy storage: stratified storage, well mixed storage, comparison. Hot water system, Practical consideration, solar ponds, Non-convective solar pond, extraction of thermal energy and application of solar ponds.

209p bachkhinhdaluu 03-12-2021 29 2   Download

This paper presents the results of operation and utilization of the DNRR. In addition, some main reactor renovation projects carried out during the last 10 years tre also mentioned in the paper.

9p trinhthamhodang1218 14-03-2021 6 2   Download

(BQ) This second edition meets the changing needs for a selfteaching text for working professionals and students in this field and the need for a supplemental aid for junior- and senior-year college students. We wish every user a fulfilling experience in study from this book.

181p tradaviahe14 13-01-2021 15 1   Download

Fruit leathers are made by drying a very thin layer of fruit puree to produce a product with a texture similar to soft leather. Fruit leather is the product prepared by blending fruit purees or pulp extracted from ripe pulpy fruit, sugar or other nutritive sweeteners and other ingredients and additives desired for product and dehydrated to form sheet which can be cut to desired shape and size. The preservation of fruit leathers depends on their low moisture content, the natural acidity of the fruit used and high sugar contents.

6p caygaocaolon6 30-07-2020 14 1   Download

Drying is an important post-harvest preservation technique of spices. As drying is an energy intensive process, accessibility to good drying methods is essential for the economical betterment of the farmers. Solar energy based drying techniques offer better return on investment to farmers. Developed hybrid solar drying system can be used for drying various agricultural products like spices, fruits and vegetables. The dryer has been coupled to an electric air heater having an auto controlling facility and blackened surface of absorber for improved drying efficiency.

7p gaocaolon5 14-06-2020 16 1   Download

The study was carried for a Raghiely number between (3.77 - 10.8)*107 with applied heat flux between (20 - 45) Watt. The vibrational experimental measurements were carried out for different frequency ratio (0.87-1.6) and vibrational Rayleigh number ranged between (0.12 - 2.7)*107 . The results of the heat transfer inside the enclosure without vibration show a very close agreement with the published one.

12p cleopatrahuynh 01-06-2020 18 0   Download

This lecture focuses on the hydrosphere and atmosphere: the water and air on and above Earth’s surface that make it habitable for life as we know it. By creating models, conducting research, and designing and carrying out investigations, Student explore the key concepts addressed in this unit. Those concepts include the water cycle, the nature of the atmosphere, and the radiant energy from the Sun, which creates convection currents of wind and water that drive weather patterns and climate.

10p nanhankhuoctai2 25-05-2020 13 1   Download

Fruit and vegetables (F&V) are living tissues and highly perishable products needing optimal post-harvest technologies in order to maintain their storage stability and extend shelf life. The experiment was conducted in the winter months. Dried tomato slices ground to obtain powder. Dried powder was analyzed for its proximate composition that is moisture, crude fat, crude protein, crude fiber, ash, carbohydrates and energy. Nutritional characteristics of the dried powders were analyzed for proximate composition along with fresh fruit on dry weight basis.

12p nguaconbaynhay5 16-05-2020 14 1   Download

Two identical prototype solar dryers (direct and indirect) having the same dimensions were used to dry whole mint. Both prototypes were operated under natural and forced convection modes. In the case of the later one the ambient air was entered the dryer with the velocity of 4.2 m s1 . The effect of flow mode and the type of solar dryers on the drying kinetics of whole mint were investigated. Ten empirical models were used to fit the drying curves; nine of them represented well the solar drying behavior of mint.

8p trinhthamhodang1 16-11-2019 20 0   Download

The experimental results showed that the natural circulation system is feasible in removing the decay heat, even though some fluctuations may occur in the operation. The uneven temperature distribution in the water tank may be inevitable because convection occurs on the outside of the condensing tube besides boiling with decreasing the decay power. The instabilities in the natural circulation loop are sensitive to heat flux and system resistance rather than the water level in the steam drum and water tank. RELAP5 code shows reasonable results compared with experimental data.

9p minhxaminhyeu5 30-06-2019 19 1   Download

A variety of two-dimensional CFD numerical investigations using a turbulent model have been performed to evaluate the heat transfer characteristics and the velocity distribution of natural convection inside the canister. The present numerical solutions for a range of Rayleigh number values (3×106 ~3×107 ) and a working fluid of air are further validated by comparing with the experimental data from previous work, and they agreed well with the experimental results.

10p minhxaminhyeu5 30-06-2019 26 2   Download

The paper extended the studies of Thomas F. Irvine et al and V. D. Quang and D. H. Chung by considering the influence of heat transfer into the wall of vertical channel with natural convection motion of a power law fluid as well as the influence of heat sources.

7p bautroibinhyen211 28-10-2018 32 1   Download

The solidification interface is represented by connected elements that move on the fixed background grid. Code validations are carried out through various problems. Finally, the temporal dependence of the solid area ratio of the solid phase to the cylinder upon various dimensionless parameters, such as Rayleigh number, Prandtl number, Stefan number, thermal property ratios as well as a parameter indicating the effect of superheat is studied.

12p thienthanquydu 23-10-2018 15 1   Download

In this paper the spreading of a contaminant accompanied with natural convection in a box is numerically simulated. The box may be considered as a cooking room or a working place where some sources of heat and contaminant are in the simultaneous action.

12p thienthanquydu 23-10-2018 23 2   Download

analytical heat transfer has contents: introduction, mechanisms of heat transfer, zero-dimensional (lumped) analysis, thermal control, physics of heat transfer, one dimensional conduction, one-dimensional forced convection, one-dimensional natural convection, multidimensional conduction,...and other contents.

309p bautroibinhyen20 06-03-2017 39 3   Download

(bq) part 1 book "principles of heat transfer" has contents: basic modes of heat transfer, heat conduction, numerical analysis of heat conduction, analysis of convection heat transfer, natural convection.

371p bautroibinhyen20 06-03-2017 52 7   Download