Thermodynamics ENERGY, WORK, AND HEATSummaryThe important information from this chapter is summarized below.Energy, Work, and Heat Summary• Heat is described as energy in transit. This transfer occurson a molecular level as a result of temperature differences.The unit of heat is the British thermal unit (Btu).Latent heat = the amount of heat added orremoved to produce only aphase change.Sensible heat = the heat added or removedthat causes a temperaturechange.• The following properties were defined:Specific enthalpy (h) is defined as h = u +Pn, where u is the specific internal energy(Btu/lbm) of the system being studied, P isthe pressure of the system (lbf/ft2), and n isthe specific volume (ft3/lbm) of the system.Entropy is sometimes referred to as ameasure of the inability to do work for agiven heat transferred.Rev. 0 Page 25 HT-01
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