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UNC-Chapel Hill GEOG 111 - Heat Transfer

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GEOG 111 1st Edition Lecture 7 Outline of Last Lecture I. Energy Transfera. Radiation transferb. Heat transferc. Energy imbalances and energy transferOutline of Current Lecture I. Heat transfera. Sensible heat fluxb. Latent heat fluxCurrent LectureI. Heat Transfera. Always occurs when there is a temperature difference across a mediumb. The rate of heat transfer is related to the temperature differencei. The greater the difference the more rapidly the temperatures will equalize out (warmer  cooler)ii. Example: January Heat fluxa. The ocean’s surface is warmer than atmosphere, so the sensible heat flux is very high2. Why are heat fluxes high off of the North American and Asian coasts?a. Prevailing winds go west to east; cold air masses develop over the land and moves across the waterb. Gulf streamc. Two types of heat transfer:i. Sensible heat flux- the rate at which heat that can be sensed moves from one place to another1. Heat flux- quantity of heat moved across a unit area per unit time (e.g. watts/m^2)a. Contributing processes:i. Conduction- molecule by molecule heat transfer1. Thermal conductivity- the ease with which heat conducts through a material2. Copper has very high thermal conductivity whileair does notii. Convection-heat movement through bodily movement; warmer moves upward1. Example: Air moving from warmer to coolerThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.2. Example: The Hadley Cell- lots of convection in the equatorial region generated by differences in temperature3. Example: boiling water. Warmer water at the bottom of the pan convects upward to heat the cooler water4. Example: Cumulus cloudsiii. Advection- horizontal movement of heat through wind circulation or ocean currents1. Example: southerly winds advect warm air northwardii. Latent heat flux- heat movements through phase changes in water1. Example: in the process of evaporation, heat goes into a latent (or hidden) form as it is absorbed and creates a cooling effecta. Sensible heat  evaporation  water vapor (latent energy) thatrises  condensation (heat is released)  cloud + sensible heatb. Net movement of sensible heat from surface up into a cloudc. Evaporation produces a cooling (sensible heat being converted to latent


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