This Part 4 of the spacecraft thermal control and design data handbooks, provides information on calculating the conductive heat transfer rate for a variety of two and three-dimensional configurations. Calculations for the conductance of the interface between two surfaces (joints) require special consideration and are included as a separate clause. The Thermal design handbook is published in 16 Parts TR 17603-31-01 Thermal design handbook Part 1: View factors TR 17603-31-02 Thermal design handbook Part 2: Holes, Grooves and Cavities TR 17603-31-03 Thermal design handbook Part 3: Spacecraft Surface Temperature TR 17603-31-04 Thermal design handbook Part 4: Conductive Heat Transfer TR 17603-31-05 Thermal design handbook Part 5: Structural Materials: Metallic and Composite TR 17603-31-06 Thermal design handbook Part 6: Thermal Control Surfaces TR 17603-31-07 Thermal design handbook Part 7: Insulations TR 17603-31-08 Thermal design handbook Part 8: Heat Pipes TR 17603-31-09 Thermal design handbook Part 9: Radiators TR 17603-31-10 Thermal design handbook Part 10: Phase Change Capacitors TR 17603-31-11 Thermal design handbook Part 11: Electrical Heating TR 17603-31-12 Thermal design handbook Part 12: Louvers TR 17603-31-13 Thermal design handbook Part 13: Fluid Loops TR 17603-31-14 Thermal design handbook Part 14: Cryogenic Cooling TR 17603-31-15 Thermal design handbook Part 15: Existing Satellites TR 17603-31-16 Thermal design handbook Part 16: Thermal Protection System