By John H. Lienhard IV and John H. Lienhard V
This textbook is an creation to warmth and mass move orientated towards engineering scholars. the themes coated contain warmth conduction, compelled and normal convection, thermal radiation, boiling, condensation, warmth exchangers, and mass move. The publication contains labored examples and end-of-chapter workouts. The 3rd variation (2003) has been generally revised and up to date from the previous moment variation (1987).
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Extra resources for A Heat Transfer Textbook, Third Edition
To do this, note that the heat transfer, Q, must be the same at every cross section. Write Fourier’s law locally, and integrate it from top to bottom to get a relation between this unknown Q and the known end temperatures. 11 A hot water heater contains 100 kg of water at 75◦ C in a 20◦ C room. 3 m2 . Select an insulating material, and specify its thickness, to keep the water from cooling more than 3◦ C/h. (Notice that this problem will be greatly simpliﬁed if the temperature drop in the steel casing and the temperature drop in the convective boundary layers are negligible.
That is the question of whether a problem is “theoretical” or “practical”. Quite often the student is inclined to view as “theoretical” a problem that does not involve numbers or that requires the development of algebraic results. The problems assigned in this book are all intended to be useful in that they do one or more of ﬁve things: 1. 25). 2. 39). These are probably closest to having a “theoretical” objective. 3. 21). Such problems are usually the most diﬃcult and the most valuable to you.
It radiates through an evacuated annulus to a surrounding spherical shell of Nichrome V. 3 cm thick. It is black on the inside and is held at 25◦ C on the outside. Find (a) the temperature of the inner wall of the shell and (b) the heat transfer, Q. 28 The sun radiates 650 W/m2 on the surface of a particular lake. At what rate (in mm/hr) would the lake evaporate away if all of this energy went to evaporating water? Discuss as many other Chapter 1: Introduction 44 ways you can think of that this energy can be distributed (hfg for water is 2,257,000 J/kg).