Preface

The course material on Heat Transfer Operations is designed for the undergraduate students of Chemical Engineering. The course provides an elementary knowledge of the heat transfer operations. The course is primarily developed for the students those who need the fundamental knowledge in the heat transfer operations. The course contains nine modules divided into forty lectures. A couple of solved examples are provided during discussion in the lecture. At the end of each of the module, a few of the frequently asked questions along with problems for practice are provided.

In the first module, mode of heat transfer is discussed along with some of the material properties relevant to heat transfer is discussed. The second module contains one dimensional conduction process through constant and variable heat transfer area. The heat conduction in bodies with heat sources is also covered for different geometries like slab, cylinder and sphere. The third module is devoted to one dimensional convective heat transfer, which covers principle of heat flow in fluids and concept of heat transfer coefficient. The concept of overall heat transfer coefficient with the temperature profile is also discussed in detail. The concept of fins is introduced and general relations are elaborated for different cases using suitable boundary conditions and assumptions. The brief knowledge of thermal insulation is also covered in the third module. The module four is about the forced convection heat transfer, where the flow of the fluid is in or on the surface of different geometries along with various correlation. The module also covers the various useful analogies. The module five contains heat transfer by natural convection and covers the correlation for different geometries. The module six is devoted to boiling and condensation. The principle of boiling and condensation is discussed in detail. The condensation in and on the surface of different geometries are discussed and correlation are provided. The module seven is on radiation heat transfer, covering emissive power, radiosity, and irradiation along with the various laws. The definition of blackbody and grey body is discussed. The view factor, relation between view factor, and radiation shield are discussed. At the end of the module, the introduction to radiation combined with conduction and convection is provided. The module eight and nine are devoted to the heat transfer equipment. Heat exchangers are discussed in the module eight. The various elements of the shell and tube heat exchanger are described along with the thermal design of the heat exchanger. Calculation of the pressure drop, NTU method, as well as calculation and designing of the heat exchanger are described in this module. The module nine contains the discussion on the evaporators. Different solution properties are discussed along with the different kind of evaporators. Performance of the steam heated tubular evaporators and the temperature profile in the evaporator are discussed. Different methods of feeding are discussed as well as calculation and procedure of enthalpy balance is described in details.          

The different correlations used in the study material are developed over the time by many scientists and researchers. The references to these famous correlations are given in the standard books on heat transfer and are listed in the reference link of this course material.

Anil Verma