HEAT FLOW BASICS. Heat
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1 HEAT FLOW BASICS all terrestrial objects radiate, at infrared wavelengths that are not visible to the eye but can be detected by an IR sensor Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 1 Heat Heat is a form of energy that is embodied in the vibrational activity within an atom s structure (primarily within its electron cloud) I-P units are: British thermal units (Btu) SI units are: Joules (J) Heat is a near-basic energy form; solar radiation, light, sound, electricity, motion all these phenomena devolve into heat Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 2
2 Heat Flow Heat flow is the movement or exchange of heat always from a more energetic (hotter) to a less energetic (cooler) substance or area I-P units are: British thermal units per hour ** (Btu/h or Btuh) ** SI units are Watts Entropy is related to a law of physics that says that heat cannot naturally flow uphill (from cold to hot); thus, entropy (energy un-usability) always increases unless an energy-using enhancement system (such as a motor) intervenes ** these seemingly opposite notations are in fact used interchangeably Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 3 Temperature Temperature is a measure of the density (not the absolute quantity) of heat in a substance I-P units are: degrees F SI units are: degrees C A 55-gallon drum of concrete at 85 deg F contains much more heat than a 55-gallon drum of air at 85 deg F (although they are at the exact same temperature) Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 4
3 Heat Capacity Heat capacity is a measure of the potential energy content (quantity, not density) of a defined volume or weight of material I-P units are: Btu/cubic ft or Btu/pound SI units are: Joules/cu meter or Joules/kilogram The heat capacity of materials is a critical property in the design of passive climate control systems (see the previous example of 55 gal drums) Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 5 Heat Descriptors ( Types of Heat) Sensible Heat Describes a process wherein the addition or subtraction of heat results in a change in temperature Measured with a dry-bulb thermometer Latent Heat Describes a process where the addition or subtraction of heat results in a change in moisture content Measured indirectly (via wet-bulb temperature or relative humidity) Heat, at the end of the day, is heat but it can take different forms and cause different effects (of particular concern to people and materials) Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 6
4 Sensible and Latent Heat the energy from the electric burner increases the temperature of the room air; the energy from the gas burner increases air temperature, but also adds some moisture to the air from the combustion process; the energy from the burner with the boiling water adds a lot of moisture to the air (along with some sensible heat) the stove energy output may be the same in all three cases, but the effects on the room are not all sensible heat mostly sensible heat mostly latent heat Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 7 Heat Flow Mechanisms ways that heat can flow from here to there Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 8
5 Heat Flow Mechanisms Conduction (sensible heat flow) Convection (sensible heat flow) Radiation (sensible heat flow) Evaporation/Condensation (latent heat flow) Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 9 Conduction The exchange of heat between two adjacent and touching objects (or from one place to another within a single object) by proximity contact between molecules examples: the flow of heat from a metal stud to adjacent gypsum board; the flow of heat through a brick Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 10
6 Convection perso.ens-lyon.fr/mathieu.gibert/ The exchange of heat from the surface of a solid to/from a surrounding fluid (usually air) or heat exchange within a fluid itself; the ready motion of the molecules of the fluid is important in promoting heat flow examples: fanning yourself with a magazine; heat being swept away from a window during a blizzard Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 11 Radiation The exchange of heat between objects that are not in contact (but are within view of each other) via electromagnetic radiation; the objects may be a few inches or a million miles apart examples: warming yourself in front of a fireplace; a closed car heating up on a sunny day Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 12
7 Evaporation A flow of heat that occurs as a material changes state from a liquid to a gas; this involves the energy required to break molecular bonds (called the latent heat of vaporization) examples: blowing on your coffee to cool it; feeling especially cool when coming out of a swimming pool on a windy day Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 13 Modes of Heat Flow use and apply what you know even in the face of weirdness (see labels below) convection evaporation Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 14
8 Jim Augustyn: The Solar Cat Book Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 15 the Solar Cat does not exaggerate Ball State Architecture ENVIRONMENTAL SYSTEMS 1 Grondzik 16
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