ALTITUDE EFFECTS ON HEAT by
... of the aircraft (range, maneuverability, payload) are to be maintained, additional wing area, thrust, and fuel are required to compensate for the added weight. Thus, the actual weight penalty of an aircraft can be 1.5 - 7 times larger than the basic increase in the specific system weight, as shown i ...
... of the aircraft (range, maneuverability, payload) are to be maintained, additional wing area, thrust, and fuel are required to compensate for the added weight. Thus, the actual weight penalty of an aircraft can be 1.5 - 7 times larger than the basic increase in the specific system weight, as shown i ...
Chapter 19 - Clg Coils
... The thermodynamic relations for the overall performance of a cooling coil were presented in Chapter 5, Section 5.6, and a simple bypass model was developed. The bypass model is based on the assumption that some of the air stream is in close contact with the coil surfaces and leaves at saturated cond ...
... The thermodynamic relations for the overall performance of a cooling coil were presented in Chapter 5, Section 5.6, and a simple bypass model was developed. The bypass model is based on the assumption that some of the air stream is in close contact with the coil surfaces and leaves at saturated cond ...
basics of heat transfer
... and a warm canned drink left in a refrigerator cools down. This is accomplished by the transfer of energy from the warm medium to the cold one. The energy transfer is always from the higher temperature medium to the lower temperature one, and the energy transfer stops when the two mediums reach the ...
... and a warm canned drink left in a refrigerator cools down. This is accomplished by the transfer of energy from the warm medium to the cold one. The energy transfer is always from the higher temperature medium to the lower temperature one, and the energy transfer stops when the two mediums reach the ...
Institutionen för systemteknik Department of Electrical Engineering
... The purpose of the working fluid is to carry the heat. The heat is absorbed in the evaporator and transported to the turbine expander where it is turned into work. The more heat that can be turned into work, the higher efficiency of the complete system. When choosing working fluid, several parameter ...
... The purpose of the working fluid is to carry the heat. The heat is absorbed in the evaporator and transported to the turbine expander where it is turned into work. The more heat that can be turned into work, the higher efficiency of the complete system. When choosing working fluid, several parameter ...
Ch. 1
... as tiny balls that are in motion and thus possess kinetic energy. Heat is then defined as the energy associated with the random motion of atoms and molecules. Although it was suggested in the eighteenth and early nineteenth centuries that heat is the manifestation of motion at the molecular level (c ...
... as tiny balls that are in motion and thus possess kinetic energy. Heat is then defined as the energy associated with the random motion of atoms and molecules. Although it was suggested in the eighteenth and early nineteenth centuries that heat is the manifestation of motion at the molecular level (c ...
Convection
Convection is the concerted, collective movement of groups or aggregates of molecules within fluids (e.g., liquids, gases) and rheids, through advection or through diffusion or as a combination of both of them. Convection of mass cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids. Diffusion of heat can take place in solids, but that is called heat conduction. Convection cannot be demonstrated by placing a heat source (e.g. a Bunsen burner) at the side of a glass full of a liquid, and observing the changes in temperature in the glass caused by the warmer ghost fluid moving into cooler areas.Convective heat transfer is one of the major types of heat transfer, and convection is also a major mode of mass transfer in fluids. Convective heat and mass transfer take place both by diffusion – the random Brownian motion of individual particles in the fluid – and by advection, in which matter or heat is transported by the larger-scale motion of currents in the fluid. In the context of heat and mass transfer, the term ""convection"" is used to refer to the sum of advective and diffusive transfer. In common use the term ""convection"" may refer loosely to heat transfer by convection, as opposed to mass transfer by convection, or the convection process in general. Sometimes ""convection"" is even used to refer specifically to ""free heat convection"" (natural heat convection) as opposed to forced heat convection. However, in mechanics the correct use of the word is the general sense, and different types of convection should be qualified for clarity.Convection can be qualified in terms of being natural, forced, gravitational, granular, or thermomagnetic. It may also be said to be due to combustion, capillary action, or Marangoni and Weissenberg effects. Heat transfer by natural convection plays a role in the structure of Earth's atmosphere, its oceans, and its mantle. Discrete convective cells in the atmosphere can be seen as clouds, with stronger convection resulting in thunderstorms. Natural convection also plays a role in stellar physics.