Heat Transfer HEAT TRANSFER TERMINOLOGYHEAT TRANSFER TERMINOLOGYTo understand and communicate in the thermal science field, certain terms andexpressions must be learned in heat transfer.EO 1.1 DESCRIBE the difference between heat and temperature.EO 1.2 DESCRIBE the difference between heat and work.EO 1.3 DESCRIBE the Second Law of Thermodynamics andhow it relates to heat transfer.EO 1.4 DESCRIBE the three modes of heat transfer.EO 1.5 DEFINE the following terms as they relate to heattransfer:a. Heat fluxb. Thermal conductivityc. Log mean temperature differenced. Convective heat transfer coefficiente. Overall heat transfer coefficientf. Bulk temperatureHeatandTemperatureIn describing heat transfer problems, students often make the mistake of interchangeably usingthe terms heat and temperature. Actually, there is a distinct difference between the two.Temperature is a measure of the amount of energy possessed by the molecules of a substance.It is a relative measure of how hot or cold a substance is and can be used to predict the directionof heat transfer. The symbol for temperature is T. The common scales for measuringtemperature are the Fahrenheit, Rankine, Celsius, and Kelvin temperature scales.Heat is energy in transit. The transfer of energy as heat occurs at the molecular level as a resultof a temperature difference. Heat is capable of being transmitted through solids and fluids byconduction, through fluids by convection, and through empty space by radiation. The symbolfor heat is Q. Common units for measuring heat are the British Thermal Unit (Btu) in theEnglish system of units and the calorie in the SI system (International System of Units).Rev. 0 Page 1 HT-02
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