Heating enclosures

Naylor, D. and Oosthuizen, P.H., A Numerical Study of Free Convective Hoat Transfer in a Parallelogram-Shaped Enclosure . Heat Fluid Flow, Vol. 4, No. 6. pp. 553-559. 1994. 

The sensitive electronic circuitry of a power transistor at the junction is protested by its case, which is a rigid metal enclosure. Heat transfer characteristics of a power transistor are usually specified by the manufacturer in terms of the case-to-ambient thermal resistance, which accounts for both Ihe natural convection and radiation heat transfers. 

These relations can also be used for other gases with 0.5 < Pr < 2. Using water, silicone oil, and mercury in llieir experiments, Globe and Dropkin (1959) obtained this correlation for horizontal enclosures heated from below,... 

J. L. Lage and A. Bejan, The Ra-Pr Domain of Laminar Natural Convection in an Enclosure Heated From the Side, Numerical Heat Transfer Part A (19) 21-41,1991. 

Hideo, I. Yanlai, Z. Akihiko, H. Naoto, H. Numerical simulation of natural convection of latent heat phase-change-material microcapsulate slurry packed in a horizontal rectangular enclosure heated from below and cooled from above. Heat Mass Transfer 43 (2007) 459-470. 

For forced convection cooling applications, the designer can relate the temperature rise in the coolant temperature ATcooiant (°C, K), within an enclosure/heat exchanger containing subsystem(s) that obstruct... 

Overall higher energy (0.1 kWh vs. 33 kWh) increases heat generation and criticality of thermal management, which can be further influenced by battery pack enclosure heat transfer limitations. 

Two identical copper ingots, one at 500°C (773 K) and the other at 300°C (573 K) are placed in an insulated enclosure. Heat flows from the hot ingot to the cold ingot until the temperature of both ingots is the same (400°C). Calculate the total entropy change accompanying this process. 

Figure 5.1 Thermally conductive carbon fiber-reinforced PPS injection molded stepper motor enclosure— heat sink. (Courtesy of Cool Polymers, Inc.)...

A furnace is a device (enclosure) for generating controlled heat with the objective of performing work. In fossil-fuel furnaces, the work appHcation may be direct (eg, rotary kilns) or indirect (eg, plants for electric power generation). The furnace chamber is either cooled (waterwaH enclosure) or not cooled (refractory lining). In this article, furnaces related to metallurgy such as blast furnaces ate excluded because they ate coveted under associated topics (see... 

H. C. Hottel and E. S. Cohen, "Radiant Heat Exchange in a Gas-EiUed Enclosure," paper presented at ASME/AIChE Joint Heat Transfer Conference, University Park, Pa., Aug. 1957, AIChE Paper No. 57-HT-23. 

Circulating fluidized-beds do not contain any in-bed tube bundle heating surface. The furnace enclosure and internal division wall-type surfaces provide the required heat removal. This is possible because of the large quantity of soflds that are recycled internally and externally around the furnace. The bed temperature remains uniform, because the mass flow rate of the recycled soflds is many times the mass flow rate of the combustion gas. Operating temperatures for circulating beds are in the range of 816 to 871°C. Superficial gas velocities in some commercially available beds are about 6 m/s at full loads. The size of the soflds in the bed is usually smaller than 590 p.m, with the mean particle size in the 150—200 p.m range (81). 

Cij = mean specific heat of combustion products from base temperature to leaving-gas temperature Te-C = cold-surface fraction of a furnace enclosure. 

If an enclosure may be divided into several radiant-heat sources or sinks Ai, A2, etc, and the rest of the enclosure (reradiating refractoiy surface) may be lumped together as A at a uniform temperature Tr, then the total interchange area for zone pairs in the black system is given by... 

The new simplified furnace now consists of an enclosure formed by two 1.83-by 3.05-m (6- by 10-ft) radiating sidewalls (area A9, emissivity 0.702), a 1.52- by 3.05-m (5- by 10-ft) receiving plane on the floor A3, and refractory surfaces A, to complete the enclosure (ends, roof, and floor side strips). The desired heat transfer is... 

HEAT AND MASS TRANSFER TABLE 5-10 Total-Exchange Areas for Four Arrangements of Two-Zone-Surface Enclosures of a Gray Gas... 

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