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Heat is the amount of energy flowing from one body to another spontaneously due to their temperature difference, or by any means other than through work or the transfer of matter. The transfer can be by contact between the source and the destination body, as in conduction; or by radiation between remote bodies; or by way of an intermediate fluid body, as in convective circulation; or by a combination of these. In contrast, a body indeed has properties (State functions) such as temperature and internal energy. The book sets out the fundamentals of Heat Engineering. It is intended as a textbook for university engineering students. It is designed especially for extra-mural and correspondence students and others working on their own. This book contains 15 chapters. Each chapter has been written in simple and lucid language. The concepts of the chapters have been described in step by step method to understand the concept easily by the students. It will be found to be useful by all engineering students reading a course in general Heat Engineering. Brief Contents: Part 1. Engineering thermodynamics • Basic Concepts of Thermodynamics and Definitions • The First Law of Thermodynamics • Investigation of Basic Thermodynamic Processes • Water Vapour and Steam • Flow and Throttling of Gases and Vapours • The Second Law of Thermodynamics • Cycles of Internal-Combustion Engines. Compressors • Cycles of Gas Turbines and Jet Engines • Cycles of Steam Power Plants • Cycles of Refrigerating Units and Heat Pumps. Part II. Fundamentals of heat transfer II • Conduction • Convection • Thermal Radiation • Complex Processes of Heat Transfer • Heat-Exchange Equipment. Part III. Boiler plants • General Information on Boiler Plants and Boiler • Fuel 164 III-4. Kinds of Fuel • Combustion of Fuel and Gas Calculations • Heat Balance of Boiler Unit • General Characteristics of, Furnaces and Furnace Calculation Fundamentals • Furnace Design • Design of Boilers and Boiler Units • Internal Boiler Processes • Superheaters, Economizers and Air Heaters • Auxiliary Equipment of Boiler Units. Water Treatment. Part IV. Reciprocating engines • Types of Reciprocating Engines and Their Working Processes • Construction of Internal-Combustion Engines • Calculation of Engines • Mixture Formation and Engine Governing • Engine Accessories • Types of Engines Part V. Steam and gas turbines • Theoretical Fundamentals of Steam Turbines • Design of Steam Turbines V-7. Thermal Calculations • Types of Turbines and Turbine Governing • Turbine and Condenser Design • Theoretical Fundamentals of Gas Turbines • Gas-Turbine Design. Part VI. Thermal electric power stations • Heat Power Plants • Flow Diagrams and Layouts of Electric Stations Fitted with Steam • Turbines • Water Supply of Thermal Electric Power Stations • Fuel-Transport and Fuel-Handling Facilities • Layout of Steam Turbine Power Plants • Automation in Power Plants • Power Plant Economics • Nuclear (Atomic) Power Plants • New Ways of Converting Heat into Electric Power.