Guide Introduction to Heat Transfer

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Some of the factors influencing the selection of heat exchangers are also discussed. The remaining chapters focus on mass transfer and its simultaneous occurrence with heat transfer; the air-water vapor system, with emphasis on humidity and enthalpy as well as wet-bulb temperature, adiabatic saturation temperature, cooling by evaporation, drying, and condensation; and physical properties and other information that must be taken into account before any generalized formula for heat or mass transfer can be applied to a specific problem.


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This means that all material stored or added to a system at ambient temperature has zero enthalpy and they only have to worry about things that are hotter or colder. This can simplify the energy balance. This is only useful on Earth of course.

Heat transfer

Any program of Mars would require a complete overhaul of this past system. Atoms since their natural state is always preserved despite the external world which we live in, meaning essentially an atom's internal enthalpy and entropy remain constant despite outside influences [unless somehow it is radioactive] it would be much more intelligent to use such a system as the new system of constants for measuring enthalpy, and other useful tidbits which will definitely be required in Space Flight and on Mars.

In practice, only for gases there's a relevant difference between constant-pressure specific heat and specific heat for other transformations e. Solids and liquids have only one value of specific heat capacity. For example, copper has a specific heat capacity of 0. Therefore we have to put in 0. Note that these terms tend to be used loosely. What is properly the specific heat capacity is often referred to as the specific heat or the heat capacity. If in doubt, look at the units.

Technically the heat capacity refers to the whole body, the specific heat capacity to a mass — in the SI system one kilogram. In thermodynamic tables, data is sometimes given per mole or kilomole instead of per kilogram, especially for gases. Sorry, but you will have to convert. Always look at the units. Pressure-constant transformations in heat transfer problems, are often heat exchanges between a fluid and other fluids or solids, e.

What will be the final condition? The total enthalpy will be unchanged. Thus the water has zero enthalpy, and the copper has 15 x x 0. This is the enthalpy of the system.

Learning Outcomes

In other words, it would take Therefore adding Looking at this a different way, we can see that the specific heat capacity of water is 4. Thus adding this amount of water to 25 kg would dilute the 60 K temperature difference as 60 x 1. Conduction is concerned with the transfer of thermal energy through a material without bulk motion of the material. This phenomenon is fundamentally a diffusion process that occurs at the microscopic level. Convection is concerned with the transfer of thermal energy in a moving fluid liquid or gas.

Convection is characterized by two physical principles, conduction diffusion and bulk fluid motion advection. The bulk fluid motion can be caused by an external force, for example, a fan, or may be due to buoyancy effects. Finally, Radiation is the transfer of thermal energy through electro-magnetic waves or photons.

Intro to Heat Transfer

It is interesting to note that Radiation requires no medium. Conduction is the diffusion of thermal energy , i. On a microscopic level, this occurs due to the passing energy through molecular vibrations. The reason diffusion occurs is due to the nature of equilibrium. Heat contains energy and as it progresses towards equilibrium, especially in excess amounts, it then continues to proceed past equilibrium where it now considered to be a Joule.

In other words, it is like throwing a ball into the ocean, it has excess energy, and as it it goes into the water the excess energy is delivered to the water, and as soon as all this energy has dissipated or rather reached a specific quantity or heat you could say , then it again begins to rise to the surface of the water, again towards equilibrium in this case the difference between the water and air.

The units of heat transfer rate are watts.

Basic Introduction About Heat Transfer - Mechanical Booster

It should be noted that heat transfer rate is a vector quantity. It is often convenient to describe heat transfer rate in terms of the geometry being studied. The governing rate equation for conduction is given by Fourier's Law. For one dimension, Fourier's law is expressed as:. The negative sign indicates that heat is transferred in the direction of decreasing temperature. The thermal conductivity is a measure of how readily a material conducts heat. Materials with high conductivity, such as metals, will readily conduct heat even at low temperature gradients.

Materials with low conductivity, such as asbestos , will resist heat transfer and are often referred to as insulators. Convection is the transfer of thermal energy between a solid and a moving fluid sometimes magnetism. If the fluid is not in motion its Nusselt number is 1 , the problem can be classified as Conduction.


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  6. Convection is governed by two phenomena: the movement of energy due to molecular vibrations within an object and the large-scale motion of fluid particles. Forced Convection occurs when a fluid is forced to flow. For example, a fan blowing air over a heat exchanger is an example of Forced Convection. In Free Convection, the bulk fluid motion is due to buoyancy effects. For example, a vertical heated plate surrounded by quiescent air causes the air surrounding it to be heated.

    Because hot air has a lower density than cold air, the hot air rises. The void is filled by cold air and the cycle continues. In terms of Electromagnetic Convection of a Solid, it is the attempt of a solid to form a perfect lattice, thus we are able to understand why a solid melts under convection via a high voltage coil. Thus the convection of a gas can yield a liquid. Very useful for Chemical Engineers.

    This expression, in spite of its name, is not law. Rather, it is an empirical expression of proportionality of the heat flux and the temperature difference between the solid and the fluid. The heat transfer coefficient is typically determined by experiment. Correlations for heat transfer coefficient for various kinds of flows have been determined and are documented in literature. Radiation is the transfer of thermal energy between two objects through electromagnetic waves. Unlike conduction and convection, radiation does not require a medium; in other words, radiation heat transfer occurs between two bodies without contact between them.

    In general, gasses do not take part in radiation heat transfer. Radiation is based on the fact that all objects of finite temperature, i. These waves travel until they impinge another object. The second object in turn either absorbs, reflects, or transmits the energy.

    It should be noted that if the second object is of a finite temperature, it is also emitting radiation.