4.1 Energy Conversion as Interpreted by the Principles of Thermodynamics -- 4.2 Regeneration Technologies -- 4.2.1 Heat Exchanging Devices -- 4.2.1.1 Heat Regenerators -- 4.2.2 Air-Compression Heat Pump, Operating of the Brayton Counter Clockwise Cycle -- 4.2.3 Regeneration of Low Potential Thermal Energy Using a Vapor-Compression Heat Pump (Counterclockwise Rankine Cycle) -- 4.3 Recuperation Technologies for Thermal Waste and Environmental Energy -- 4.3.1 Osmotic-Absorption Technology -- 4.3.2 Hydrodynamic Recuperation Technologies -- 4.3.3 Radiative-Optical Technologies Concentrating Solar Energy -- 4.3.3.1 Technology of the Reflecting Geometry -- 4.3.3.2 Technology of the Geometrical Optics -- 4.4 Control Questions -- 5. Energy Transfer and Storage -- 5.1 From Spontaneous to Controlled Transfer and Storage of Energy (Trends in the Development of Energy Transfer Technologies) -- 5.2 Control of Heat Transfer in Energy Equipment -- 5.2.1 Vector Quantities of Heat Transfer and Gradient of the Temperature Field -- 5.2.1.1 Vector Quantities of Heat Transfer -- 5.2.1.2 Temperature Field -- 5.2.2 Energy Transfer in Solids, Gases, and Liquids (Thermal Conductivity and Convection) -- 5.2.3 Characteristics of Heat Transfer through Compact Inhomogeneous Multilayer Walls -- 5.2.4 The Role of Heat Storage in Compact Bodies: Capacitive Thermal Resistance -- 5.2.5 Radiative Heat Transfer: Reflective Heat Resistance -- 5.2.6 Control of the Heat Transfer through TDS Control Surfaces (Arrangement of the Thermal Resistances within the Structure of Compact Wall Elements) -- 5.2.7 Calculation of the Thermal Insulation -- 5.3 Control Questions -- 6. Energy and Indoor Environment -- 6.1 The Necessity of Designing a Comfortable Indoor Environment -- 6.2 Energy Needed for Thermal Comfort in an Inhabited Area -- 6.3 Energy and Clean Air