3473-11 Lecture Outline 13

3473-11 Lecture Outline 13 - higher heating value of the...

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13 – 1 of 1 CHE 3473 – Fa11 Whiteley Lecture 13 (9/21/11) Assigned Reading Standard heat of rxn; calculating Smith, Van Ness, Abbott 7 th ed. (SVNA7) industrial heat effects - continued Ch. 4, pp. 135 - 150 Assignments Handouts (on web unless stated otherwise) HW 4 due Wed, Sep 21 SVNA7 Ch4 – RW walk-away points.pdf HW 5 assigned: due Wed, Sep 28 Outline 1. Complete Lecture 12 2. Walk-away points for Ch. 4 Key Concepts 1. Higher heating value (HHV) or gross heating value for a fuel is the standard heat of combustion with the H 2 O product in the liquid phase. 2. Lower heating value (LHV) or net heating value for a fuel is the standard heat of combustion with the H 2 O product in the vapor phase. 3. The difference in the HHV and LHV for a fuel is the latent heat of vaporization associated with the H 2 O product. 4. Commercial transactions (purchases and sales) of fuel products are generally based on the
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Unformatted text preview: higher heating value of the fuel (you are purchasing Btus or Js when you purchase fuel). The actual consumption of fuel as quantified in engineering calculations is based on the lower heating value of the fuel (water is not condensed as part of the combustion or fuel utilization process). 5. Constructing a path diagram is a good practice when determining industrial heat effects. You can usually establish by inspection whether the heat effect should be (+) or (-) for any step not involving a reaction. Key Skills 1. Calculating standard heats of formation for different compounds. 2. Calculating standard heats of combustion for different compounds from heat of formation data. 3. Calculating the heat of reaction for industrial reactions....
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